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Recyclerview update,delete

I have made a discussion forum where the person who is logged in can ask a question and the main forum shows all the question put up by a different user. everyone can answer the question also and rate.
The problem is when is add the question from adding question activity it is going back to discussion forum but not refreshing. What I want is as soon as the question is asked, it should show in the discussion forum and the user should have the ability to modify and delete that question. everything is dynamic how to delete the dynamic data as well.
this is my discussion forum code
package com.example.pitechnologies.pkguru.fragment;
public class DiscussionForumFragment extends Fragment {
TextView title;
RelativeLayout askquestion;
public View view;
UserProfileData userProfileData;
String U_id;
EditText que, desc;
TextView btnask;
String uname;
LinearLayout linearLayout;
ImageView imgSpoon;
final List<Model_Forum> unilist = new ArrayList<>();
private static String TAG = DiscussionForumFragment.class.getSimpleName();
private RecyclerView forumrecyclerView;
private ForumList_Adapter forumAdapter;
public DiscussionForumFragment() {
}
#Override
public void onStart() {
((AppCompatActivity) getActivity()).getSupportActionBar().hide();
super.onStart();
}
#Override
public void onResume() {
super.onResume();
((AppCompatActivity) getActivity()).getSupportActionBar().hide();
// forumdata();
}
#Override
public void onStop() {
super.onStop();
((AppCompatActivity) getActivity()).getSupportActionBar().show();
}
#Override
public View onCreateView(final LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment_discussion_forum, container, false);
title = (TextView) view.findViewById(R.id.forumtitle);
title.setText("DISCUSSION FORUM");
askquestion = (RelativeLayout) view.findViewById(R.id.askquestion);
askquestion.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(PreferenceHelper.getInstance(getActivity()).getSemid() == null) {
Intent intent = new Intent(getActivity(), ActivityLoginSignUp.class);
startActivity(intent);
}else {
Intent intent = new Intent(getActivity(), ActivityQuestionaire.class);
intent.putExtra("uu_id", U_id);
startActivity(intent);
}
}
});
forumrecyclerView = (RecyclerView) view.findViewById(R.id.recyclerview_forum);
forumrecyclerView.setHasFixedSize(true);
forumrecyclerView.setLayoutManager(new LinearLayoutManager(DiscussionForumFragment.this.getActivity()));
forumAdapter = new ForumList_Adapter(DiscussionForumFragment.this.getContext(), unilist);
forumrecyclerView.setAdapter(forumAdapter);
forumrecyclerView.setNestedScrollingEnabled(false);
imgSpoon = (ImageView) view.findViewById(R.id.image_spoon);
linearLayout = (LinearLayout) view.findViewById(R.id.pg_loader);
linearLayout.setVisibility(View.INVISIBLE);
forumdata();
return view;
}
public void forumdata() {
unilist.clear();
/* final ProgressDialog pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Loading...");
pDialog.show();*/
linearLayout.setVisibility(View.VISIBLE);
ObjectAnimator flip = ObjectAnimator.ofFloat(imgSpoon, "rotationY", 0f, 180f);
flip.setDuration(800);
flip.setRepeatCount(Animation.INFINITE);
flip.start();
StringRequest strReq = new StringRequest(Request.Method.POST,
URLconstant.FORUM, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
Log.d(TAG, response.toString());
try {
JSONObject data = new JSONObject(response);
Log.d("data", data.toString());
JSONArray datarray = data.getJSONArray("data");
for (int i = 0; i < datarray.length(); i++) {
JSONObject secondobj = datarray.getJSONObject(i);
Log.d("secondobj", secondobj.toString());
Model_Forum model_forum = new Model_Forum();
model_forum.mforum_id = secondobj.getString("forum_id");
model_forum.mqst = secondobj.getString("qst");
model_forum.mqst_description = secondobj.getString("qst_description");
model_forum.mqst_uid = secondobj.getString("qst_uid");
model_forum.muser_id = secondobj.getString("user_id");
model_forum.mfullname = secondobj.getString("fullname");
model_forum.muniver_id = secondobj.getString("univer_id");
model_forum.mbranchid = secondobj.getString("branchid");
model_forum.msemid = secondobj.getString("semid");
model_forum.mcollegeid = secondobj.getString("collegeid");
model_forum.muser_image = secondobj.getString("user_image");
model_forum.mq_date = secondobj.getString("q_date");
model_forum.mq_time = secondobj.getString("q_time");
unilist.add(model_forum);
}
if (getContext() != null) {
/* forumAdapter = new ForumList_Adapter(DiscussionForumFragment.this.getContext(), unilist);
forumrecyclerView.setAdapter(forumAdapter);*/
forumAdapter.notifyDataSetChanged();
}
} catch (JSONException e) {
e.printStackTrace();
}
// pDialog.dismiss();
linearLayout.setVisibility(View.INVISIBLE);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
// pDialog.dismiss();
linearLayout.setVisibility(View.INVISIBLE);
}
});
MySingleton.getInstance(getActivity()).addToRequestQueue(strReq);
}

Show error note if image not selected android

This is my full code below. am coding an android app that can select image from gallery or any where and upload it to Mysql server through php but if image is not selected and the upload button is press the application crashes so i want to implement the function that it shows error dialog / warning dialog if image is not selected from gallery have already implemented it in EditText but cannot implement it in Image. below is my code
package com.app.markeet;
public class ActivityPost extends AppCompatActivity implements View.OnClickListener {
private Button buttonUpload;
private Button buttonChoose;
EditText editTitle, editTextPrice, editTextDescription, editTextStatus, editTextAuthorsname, editTextAuthorsphone;
private ImageView imageView,choiceItemImg,choiceItemImg2,choiceItemImg3,choiceItemImg4;
public static final String KEY_TITLE = "name";
public static final String KEY_IMAGE = "image";
public static final String KEY_PRICE = "price";
public static final String KEY_DESCRIPTION = "description";
public static final String KEY_STOCK = "stock";
public static final String KEY_AUTHORSNAME = "authorsname";
public static final String KEY_AUTHORSPHONE = "authorsphone";
public static final String KEY_STATUS = "status";
public static final String UPLOAD_URL = "http://192.168.0.199/config/upload.php";
private int PICK_IMAGE_REQUEST = 1;
public static final int CREATE_POST_IMG = 5;
private Bitmap bitmap;
private Uri outputFileUri;
public static final int SELECT_POST_IMG = 3;
public static final String APP_TEMP_FOLDER = "kobobay";
String[] categories = { "Animals and Pets", "Electronics and Video",
"Fashion and Beauty", "Home, Furniture and Garden", "Mobile Phone and Tablets", "PC, Laptop and Accessories",
"Jobs and Services", "Real Estate and Roommate", "Hobbles, Art and Sport", "Books and Tutorial",
"Vehicles", "Other"};
int[] catevalue = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12};
Spinner spinner1;
TextView textView1;
private Toolbar toolbar;
private ActionBar actionBar;
private String selectedPostImg = "";
ImageView mChoiceItemImg, mLocationDelete;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_post);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeButtonEnabled(true);
actionBar.setTitle("");
buttonUpload = (Button) findViewById(R.id.buttonUpload);
buttonChoose = (Button) findViewById(R.id.buttonChooseImage);
editTitle = (EditText)findViewById(R.id.editTitle);
editTextPrice = (EditText)findViewById(R.id.editPrice);
editTextDescription = (EditText)findViewById(R.id.editDescription);
editTextStatus = (EditText)findViewById(R.id.editStatus);
editTextAuthorsname = (EditText)findViewById(R.id.editName);
editTextAuthorsphone = (EditText)findViewById(R.id.editPhone);
imageView = (ImageView) findViewById(R.id.imageView);
textView1 = (TextView)findViewById(R.id.text1);
spinner1 = (Spinner)findViewById(R.id.spinner1);
ArrayAdapter<String> adapter1 =
new ArrayAdapter<String>(ActivityPost.this,
android.R.layout.simple_spinner_item, categories);
adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner1.setAdapter(adapter1);
spinner1.setOnItemSelectedListener(onItemSelectedListener1);
buttonChoose.setOnClickListener(this);
buttonUpload.setOnClickListener(this);
choiceItemImg = (ImageView) findViewById(R.id.choiceItemImg);
choiceItemImg.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
showFileChooser();
}
});
mChoiceItemImg = (ImageView) findViewById(R.id.choiceItemImg2);
mChoiceItemImg.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (selectedPostImg.length() == 0) {
imageFromGallery();
} else {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(ActivityPost.this);
alertDialog.setTitle(getText(R.string.action_remove));
alertDialog.setMessage(getText(R.string.label_delete_img));
alertDialog.setCancelable(true);
alertDialog.setNeutralButton(getText(R.string.action_cancel), new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
alertDialog.setPositiveButton(getText(R.string.action_remove), new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
mChoiceItemImg.setImageResource(R.drawable.ic_camera);
selectedPostImg = "";
dialog.cancel();
}
});
alertDialog.show();
}
}
});
String URL = Constant.WEB_URL + "get/user_info.php";
StringRequest stringRequest = new StringRequest(Request.Method.POST, URL,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject jsonResponse= new JSONObject(response);
//txtName.setText(jsonResponse.getString("fullname"));
editTextAuthorsname.setText(jsonResponse.getString("login"));
//txtEmail.setText(jsonResponse.getString("email"));
editTextAuthorsphone.setText(jsonResponse.getString("phone"));// you need to create this textView txtPoints.
} catch (Throwable t) {
Log.e("onResponse", "The response: " + response + " seems to not be json formatted.");
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(ActivityPost.this,error.toString(), Toast.LENGTH_SHORT).show();
}
}){
#Override
protected Map<String,String> getParams(){
Map<String,String> params = new HashMap<String, String>();
params.put("username",ThisApplication.getInstance().getUsername());
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
AdapterView.OnItemSelectedListener onItemSelectedListener1 =
new AdapterView.OnItemSelectedListener(){
#Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
String s1 = String.valueOf(catevalue[position]);
textView1.setText(s1);
}
#Override
public void onNothingSelected(AdapterView<?> parent) {}
};
private void showFileChooser() {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST);
}
public void imageFromGallery() {
Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(Intent.createChooser(intent, getText(R.string.label_select_img)), SELECT_POST_IMG);
}
public void imageFromCamera() {
try {
File root = new File(Environment.getExternalStorageDirectory(), APP_TEMP_FOLDER);
if (!root.exists()) {
root.mkdirs();
}
File sdImageMainDirectory = new File(root, "post.jpg");
outputFileUri = Uri.fromFile(sdImageMainDirectory);
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
startActivityForResult(cameraIntent, CREATE_POST_IMG);
} catch (Exception e) {
Toast.makeText(ActivityPost.this, "Error occured. Please try again later.", Toast.LENGTH_SHORT).show();
}
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
Uri filePath = data.getData();
try {
bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), filePath);
choiceItemImg.setImageBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
}
if (requestCode == SELECT_POST_IMG && resultCode == RESULT_OK && data != null && data.getData() != null) {
Uri filePath = data.getData();
try {
bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), filePath);
choiceItemImg2.setImageBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
}
}
public String getStringImage(Bitmap bmp){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] imageBytes = baos.toByteArray();
String encodedImage = Base64.encodeToString(imageBytes, Base64.DEFAULT);
return encodedImage;
}
public void uploadImage(){
final String GetAuthorsname = editTextAuthorsname.getText().toString();
final String GetAuthorsphone = editTextAuthorsphone.getText().toString();
final String GetTitle = editTitle.getText().toString().trim();
final String image = getStringImage(bitmap);
final String GetPrice = editTextPrice.getText().toString();
final String GetStock = textView1.getText().toString();
final String GetDescription = editTextDescription.getText().toString();
final String GetStatus = editTextStatus.getText().toString();
class UploadImage extends AsyncTask<Void,Void,String> {
ProgressDialog loading;
#Override
protected void onPreExecute() {
super.onPreExecute();
loading = ProgressDialog.show(ActivityPost.this,"Please wait...","uploading",false,false);
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
loading.dismiss();
Toast.makeText(ActivityPost.this,s, Toast.LENGTH_LONG).show();
}
#Override
protected String doInBackground(Void... params) {
RequestHandler rh = new RequestHandler();
HashMap<String,String> param = new HashMap<String,String>();
param.put(KEY_TITLE,GetTitle);
param.put(KEY_IMAGE,image);
param.put(KEY_PRICE,GetPrice);
param.put(KEY_STOCK,GetStock);
param.put(KEY_DESCRIPTION,GetDescription);
param.put(KEY_STATUS,GetStatus);
param.put(KEY_AUTHORSNAME,GetAuthorsname);
param.put(KEY_AUTHORSPHONE,GetAuthorsphone);
String result = rh.sendPostRequest(UPLOAD_URL, param);
return result;
}
}
UploadImage u = new UploadImage();
u.execute();
}
public Boolean checkPicture() {
String image = getStringImage(bitmap);
String GetPrice = editTextPrice.getText().toString();
String GetDescription = editTextDescription.getText().toString();
String GetStatus = editTextStatus.getText().toString();
editTitle.setError(null);
editTextPrice.setError(null);
editTextDescription.setError(null);
editTextStatus.setError(null);
if (image.length() == 0) {
editTitle.setError(getString(R.string.error_field_empty));
return false;
} if (GetPrice.length() == 0) {
editTextPrice.setError(getString(R.string.error_field_empty));
return false;
} if (GetDescription.length() == 0) {
editTextDescription.setError(getString(R.string.error_field_empty));
return false;
} if (GetStatus.length() == 0) {
editTextStatus.setError(getString(R.string.error_field_empty));
return false;
}
return true;
}
public Boolean checkDesc() {
String GetDescription = editTextDescription.getText().toString();
editTextDescription.setError(null);
if (GetDescription.length() == 0) {
editTextDescription.setError(getString(R.string.error_field_empty));
return false;
}
return true;
}
public Boolean checkProductName() {
String GetTitle = editTitle.getText().toString();
editTitle.setError(null);
if (GetTitle.length() == 0) {
editTitle.setError(getString(R.string.error_field_empty));
return false;
}
return true;
}
public Boolean checkCategory() {
String GetStock = textView1.getText().toString();
textView1.setError(null);
if (GetStock.length() == 0) {
editTitle.setError(getString(R.string.error_field_empty));
return false;
}
return true;
}
#Override
public void onClick(View v) {
if(v == buttonChoose){
showFileChooser();
//imageFromGallery();
}
if(v == buttonUpload){
// checkUsername();
if (!ThisApplication.getInstance().isConnected()) {
Toast.makeText(getApplicationContext(), R.string.msg_network_error, Toast.LENGTH_SHORT).show();
} else if (!checkProductName() || !checkDesc() || !checkCategory()) {
} else {
uploadImage();
}
}
}
#Override
public void onBackPressed(){
finish();
}
#Override
public void onDestroy() {
super.onDestroy();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_new_item, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.sync:
Intent intent = getIntent();
finish();
startActivity(intent);
return true;
case R.id.action_post:
uploadImage();
default:
return super.onOptionsItemSelected(item);
}
}
}

Just copy this code and paste
package com.app.markeet;
public class ActivityPost extends AppCompatActivity implements View.OnClickListener {
private Button buttonUpload;
private Button buttonChoose;
EditText editTitle, editTextPrice, editTextDescription, editTextStatus, editTextAuthorsname, editTextAuthorsphone;
private ImageView imageView,choiceItemImg,choiceItemImg2,choiceItemImg3,choiceItemImg4;
public static final String KEY_TITLE = "name";
public static final String KEY_IMAGE = "image";
public static final String KEY_PRICE = "price";
public static final String KEY_DESCRIPTION = "description";
public static final String KEY_STOCK = "stock";
public static final String KEY_AUTHORSNAME = "authorsname";
public static final String KEY_AUTHORSPHONE = "authorsphone";
public static final String KEY_STATUS = "status";
public static final String UPLOAD_URL = "http://192.168.0.199/config/upload.php";
private int PICK_IMAGE_REQUEST = 1;
public static final int CREATE_POST_IMG = 5;
private Bitmap bitmap;
private Uri outputFileUri;
public static final int SELECT_POST_IMG = 3;
public static final String APP_TEMP_FOLDER = "kobobay";
String[] categories = { "Animals and Pets", "Electronics and Video",
"Fashion and Beauty", "Home, Furniture and Garden", "Mobile Phone and Tablets", "PC, Laptop and Accessories",
"Jobs and Services", "Real Estate and Roommate", "Hobbles, Art and Sport", "Books and Tutorial",
"Vehicles", "Other"};
int[] catevalue = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12};
Spinner spinner1;
TextView textView1;
private Toolbar toolbar;
private ActionBar actionBar;
private String selectedPostImg = "";
ImageView mChoiceItemImg, mLocationDelete;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_post);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeButtonEnabled(true);
actionBar.setTitle("");
buttonUpload = (Button) findViewById(R.id.buttonUpload);
buttonChoose = (Button) findViewById(R.id.buttonChooseImage);
editTitle = (EditText)findViewById(R.id.editTitle);
editTextPrice = (EditText)findViewById(R.id.editPrice);
editTextDescription = (EditText)findViewById(R.id.editDescription);
editTextStatus = (EditText)findViewById(R.id.editStatus);
editTextAuthorsname = (EditText)findViewById(R.id.editName);
editTextAuthorsphone = (EditText)findViewById(R.id.editPhone);
imageView = (ImageView) findViewById(R.id.imageView);
textView1 = (TextView)findViewById(R.id.text1);
spinner1 = (Spinner)findViewById(R.id.spinner1);
ArrayAdapter<String> adapter1 =
new ArrayAdapter<String>(ActivityPost.this,
android.R.layout.simple_spinner_item, categories);
adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner1.setAdapter(adapter1);
spinner1.setOnItemSelectedListener(onItemSelectedListener1);
buttonChoose.setOnClickListener(this);
buttonUpload.setOnClickListener(this);
choiceItemImg = (ImageView) findViewById(R.id.choiceItemImg);
choiceItemImg.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
showFileChooser();
}
});
mChoiceItemImg = (ImageView) findViewById(R.id.choiceItemImg2);
mChoiceItemImg.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (selectedPostImg.length() == 0) {
imageFromGallery();
} else {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(ActivityPost.this);
alertDialog.setTitle(getText(R.string.action_remove));
alertDialog.setMessage(getText(R.string.label_delete_img));
alertDialog.setCancelable(true);
alertDialog.setNeutralButton(getText(R.string.action_cancel), new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
alertDialog.setPositiveButton(getText(R.string.action_remove), new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
mChoiceItemImg.setImageResource(R.drawable.ic_camera);
selectedPostImg = "";
dialog.cancel();
}
});
alertDialog.show();
}
}
});
String URL = Constant.WEB_URL + "get/user_info.php";
StringRequest stringRequest = new StringRequest(Request.Method.POST, URL,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject jsonResponse= new JSONObject(response);
//txtName.setText(jsonResponse.getString("fullname"));
editTextAuthorsname.setText(jsonResponse.getString("login"));
//txtEmail.setText(jsonResponse.getString("email"));
editTextAuthorsphone.setText(jsonResponse.getString("phone"));// you need to create this textView txtPoints.
} catch (Throwable t) {
Log.e("onResponse", "The response: " + response + " seems to not be json formatted.");
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(ActivityPost.this,error.toString(), Toast.LENGTH_SHORT).show();
}
}){
#Override
protected Map<String,String> getParams(){
Map<String,String> params = new HashMap<String, String>();
params.put("username",ThisApplication.getInstance().getUsername());
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
AdapterView.OnItemSelectedListener onItemSelectedListener1 =
new AdapterView.OnItemSelectedListener(){
#Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
String s1 = String.valueOf(catevalue[position]);
textView1.setText(s1);
}
#Override
public void onNothingSelected(AdapterView<?> parent) {}
};
private void showFileChooser() {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST);
}
public void imageFromGallery() {
Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(Intent.createChooser(intent, getText(R.string.label_select_img)), SELECT_POST_IMG);
}
public void imageFromCamera() {
try {
File root = new File(Environment.getExternalStorageDirectory(), APP_TEMP_FOLDER);
if (!root.exists()) {
root.mkdirs();
}
File sdImageMainDirectory = new File(root, "post.jpg");
outputFileUri = Uri.fromFile(sdImageMainDirectory);
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
startActivityForResult(cameraIntent, CREATE_POST_IMG);
} catch (Exception e) {
Toast.makeText(ActivityPost.this, "Error occured. Please try again later.", Toast.LENGTH_SHORT).show();
}
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
Uri filePath = data.getData();
try {
bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), filePath);
choiceItemImg.setImageBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
}
if (requestCode == SELECT_POST_IMG && resultCode == RESULT_OK && data != null && data.getData() != null) {
Uri filePath = data.getData();
try {
bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), filePath);
choiceItemImg2.setImageBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
}
}
public String getStringImage(Bitmap bmp){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] imageBytes = baos.toByteArray();
String encodedImage = Base64.encodeToString(imageBytes, Base64.DEFAULT);
return encodedImage;
}
public void uploadImage(){
final String GetAuthorsname = editTextAuthorsname.getText().toString();
final String GetAuthorsphone = editTextAuthorsphone.getText().toString();
final String GetTitle = editTitle.getText().toString().trim();
final String image = getStringImage(bitmap);
final String GetPrice = editTextPrice.getText().toString();
final String GetStock = textView1.getText().toString();
final String GetDescription = editTextDescription.getText().toString();
final String GetStatus = editTextStatus.getText().toString();
class UploadImage extends AsyncTask<Void,Void,String> {
ProgressDialog loading;
#Override
protected void onPreExecute() {
super.onPreExecute();
loading = ProgressDialog.show(ActivityPost.this,"Please wait...","uploading",false,false);
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
loading.dismiss();
Toast.makeText(ActivityPost.this,s, Toast.LENGTH_LONG).show();
}
#Override
protected String doInBackground(Void... params) {
RequestHandler rh = new RequestHandler();
HashMap<String,String> param = new HashMap<String,String>();
param.put(KEY_TITLE,GetTitle);
param.put(KEY_IMAGE,image);
param.put(KEY_PRICE,GetPrice);
param.put(KEY_STOCK,GetStock);
param.put(KEY_DESCRIPTION,GetDescription);
param.put(KEY_STATUS,GetStatus);
param.put(KEY_AUTHORSNAME,GetAuthorsname);
param.put(KEY_AUTHORSPHONE,GetAuthorsphone);
String result = rh.sendPostRequest(UPLOAD_URL, param);
return result;
}
}
UploadImage u = new UploadImage();
u.execute();
}
public Boolean checkPicture() {
String image = getStringImage(bitmap);
String GetPrice = editTextPrice.getText().toString();
String GetDescription = editTextDescription.getText().toString();
String GetStatus = editTextStatus.getText().toString();
editTitle.setError(null);
editTextPrice.setError(null);
editTextDescription.setError(null);
editTextStatus.setError(null);
if (image.length() == 0) {
editTitle.setError(getString(R.string.error_field_empty));
return false;
} if (GetPrice.length() == 0) {
editTextPrice.setError(getString(R.string.error_field_empty));
return false;
} if (GetDescription.length() == 0) {
editTextDescription.setError(getString(R.string.error_field_empty));
return false;
} if (GetStatus.length() == 0) {
editTextStatus.setError(getString(R.string.error_field_empty));
return false;
}
return true;
}
public Boolean checkDesc() {
String GetDescription = editTextDescription.getText().toString();
editTextDescription.setError(null);
if (GetDescription.length() == 0) {
editTextDescription.setError(getString(R.string.error_field_empty));
return false;
}
return true;
}
public Boolean checkProductName() {
String GetTitle = editTitle.getText().toString();
editTitle.setError(null);
if (GetTitle.length() == 0) {
editTitle.setError(getString(R.string.error_field_empty));
return false;
}
return true;
}
public Boolean checkCategory() {
String GetStock = textView1.getText().toString();
textView1.setError(null);
if (GetStock.length() == 0) {
editTitle.setError(getString(R.string.error_field_empty));
return false;
}
return true;
}
#Override
public void onClick(View v) {
if(v == buttonChoose){
showFileChooser();
//imageFromGallery();
}
if(v == buttonUpload){
// checkUsername();
if (!ThisApplication.getInstance().isConnected()) {
Toast.makeText(getApplicationContext(), R.string.msg_network_error, Toast.LENGTH_SHORT).show();
} else if (!checkProductName() || !checkDesc() || !checkCategory()) {
} else {
uploadImage();
}
}
}
#Override
public void onBackPressed(){
finish();
}
#Override
public void onDestroy() {
super.onDestroy();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_new_item, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.sync:
Intent intent = getIntent();
finish();
startActivity(intent);
return true;
case R.id.action_post:
uploadImage();
default:
return super.onOptionsItemSelected(item);
}
}
}

Android Application Not Responding Error

I twice get anr when i swipe the app from recent activities. And then the app works fine also I get an anr when I switch to landscape mode. The app works as expected as long as it is not oriented landscape or swiped from recent apps.
Can someone point out what I am doing wrong here.
Thanks
MyService.java:
public class MyService extends Service {
public static boolean started = false;
public static String TRANSACTION_DONE = "com.example.root.project";
private WebSocketClient client = null;
public static SQLiteDatabase myDataBase = null;
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public int onStartCommand(final Intent intent, int flags, int startId) {
if(started){
String message = intent.getStringExtra("message");
if(client != null){
client.send(message);
}
}
if (!started) {
myDataBase = openOrCreateDatabase("Messages.db", MODE_PRIVATE, null);
myDataBase.execSQL("CREATE TABLE IF NOT EXISTS messages " +
"(tag TEXT primary key, message TEXT);");
started = true;
URI uri = null;
try {
uri = new URI(intent.getStringExtra("ip"));
} catch (URISyntaxException e) {
e.printStackTrace();
}
client = new WebSocketClient(uri) {
#Override
public void onOpen(ServerHandshake serverHandshake) {
JSONObject jsonObject = null;
try {
jsonObject = new JSONObject();
jsonObject.accumulate("addme",intent.getStringExtra("name"));
} catch (JSONException e) {
e.printStackTrace();
}
client.send(jsonObject.toString());
}
#Override
public void onMessage(String message) {
JSONObject jsonObject = null;
try {
jsonObject = new JSONObject(message);
} catch (JSONException e) {
e.printStackTrace();
}
if (jsonObject.has("resolve")) {
PendingIntent notificIntent = PendingIntent.getActivity(getApplicationContext(), 0,
new Intent(getApplicationContext(), MainActivity.class), 0);
// Builds a notification
NotificationCompat.Builder mBuilder =
null;
try {
mBuilder = new NotificationCompat.Builder(getApplicationContext())
.setSmallIcon(R.drawable.add)
.setContentTitle(jsonObject.getString("name"))
.setTicker(jsonObject.getString("resolve"))
.setContentText(jsonObject.getString("destination"));
} catch (JSONException e) {
e.printStackTrace();
}
// Defines the Intent to fire when the notification is clicked
mBuilder.setContentIntent(notificIntent);
// Set the default notification option
// DEFAULT_SOUND : Make sound
// DEFAULT_VIBRATE : Vibrate
// DEFAULT_LIGHTS : Use the default light notification
mBuilder.setDefaults(Notification.DEFAULT_ALL);
// Auto cancels the notification when clicked on in the task bar
mBuilder.setAutoCancel(true);
// Gets a NotificationManager which is used to notify the user of the background event
NotificationManager mNotificationManager =
(NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);
// Post the notification
mNotificationManager.notify((int) System.currentTimeMillis(), mBuilder.build());
} else if (jsonObject.has("remove")) {
try {
String tag = jsonObject.getString("remove");
myDataBase.execSQL("DELETE FROM messages WHERE tag = " + tag + ";");
} catch (JSONException e) {
e.printStackTrace();
}
if (isForeground(TRANSACTION_DONE)) {
Intent broadcast = new Intent(TRANSACTION_DONE);
broadcast.putExtra("message", message);
sendBroadcast(broadcast);
}
} else {
try {
myDataBase.execSQL("INSERT INTO messages (tag, message) VALUES ('" +
jsonObject.getString("tag") + "', '" + message + "');");
} catch (JSONException e) {
e.printStackTrace();
}
if (isForeground(TRANSACTION_DONE)) {
Intent broadcast = new Intent(TRANSACTION_DONE);
broadcast.putExtra("message", message);
sendBroadcast(broadcast);
}
}
}
#Override
public void onClose(int i, String s, boolean b) {
Log.d("myTag", "onClose: websocket closing ");
Toast.makeText(getApplicationContext(),"closing websocket",Toast.LENGTH_LONG).show();
}
#Override
public void onError(Exception e) {
Log.i("Websocket", "Error " + e.getMessage());
}
};
client.connect();
}
return START_STICKY;
}
#Override
public void onTaskRemoved(Intent rootIntent) {
super.onTaskRemoved(rootIntent);
Toast.makeText(getApplicationContext(),"closing client",Toast.LENGTH_LONG).show();
client.close();
}
#Override
public void onDestroy() {
super.onDestroy();
Log.d("myTag", "onDestroy: service being destroyed ");
try {
client.closeBlocking();
} catch (InterruptedException e) {
e.printStackTrace();
}
Toast.makeText(this,"Service is closing on destroy called",Toast.LENGTH_LONG).show();
}
public boolean isForeground(String myPackage) {
ActivityManager manager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> runningTaskInfo = manager.getRunningTasks(1);
ComponentName componentInfo = runningTaskInfo.get(0).topActivity;
return componentInfo.getPackageName().equals(myPackage);
}
}
MainActivity.java:
public class MainActivity extends AppCompatActivity {
private CustomAdapter adapter;
private String name;
private String ip;
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.add) {
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Title");
final View viewInflated = getLayoutInflater().inflate(R.layout.custom_dialog_layout, null);
builder.setView(viewInflated);
// Set up the buttons
builder.setPositiveButton("Publish", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
EditText editText = (EditText) viewInflated.findViewById(R.id.dialogTitle);
EditText editText2 = (EditText) viewInflated.findViewById(R.id.dialogDesc);
String title = editText.getText().toString().trim();
String desc = editText2.getText().toString().trim();
JSONObject jsonObject = new JSONObject();
try {
jsonObject.accumulate("title", title);
jsonObject.accumulate("desc", desc);
jsonObject.accumulate("name",name);
} catch (JSONException e) {
e.printStackTrace();
}
Intent intent = new Intent(MainActivity.this,MyService.class);
intent.putExtra("message",jsonObject.toString());
startService(intent);
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.show();
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if(MyPreferences.isFirst(this)) {
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Title");
final View viewInflated = getLayoutInflater().inflate(R.layout.login_dialog, null);
builder.setView(viewInflated);
// Set up the buttons
builder.setPositiveButton("Publish", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
EditText editText = (EditText) viewInflated.findViewById(R.id.dialogName);
EditText editText2 = (EditText) viewInflated.findViewById(R.id.dialogIp);
name = editText.getText().toString().trim();
ip = editText2.getText().toString().trim();
Intent intent = new Intent(MainActivity.this, MyService.class);
intent.putExtra("name", name);
intent.putExtra("ip", ip);
MainActivity.this.getSharedPreferences("my_preferences",MODE_PRIVATE).edit().putString("name",name).putString("ip",ip).commit();
startService(intent);
ListView listView = (ListView) findViewById(R.id.listView);
adapter = new CustomAdapter(MainActivity.this);
listView.setAdapter(adapter);
IntentFilter filter = new IntentFilter();
filter.addAction(MyService.TRANSACTION_DONE);
registerReceiver(myReceiver, filter);
new Handler().post(new Runnable() {
#Override
public void run() {
if (MyService.myDataBase == null) return;
Cursor cursor = MyService.myDataBase.rawQuery("SELECT * FROM messages", null);
int messageColumn = cursor.getColumnIndex("message");
cursor.moveToFirst();
if (cursor != null && (cursor.getCount() > 0)) {
do {
String message = cursor.getString(messageColumn);
try {
JSONObject jsonObject = new JSONObject(message);
adapter.add(jsonObject.getString("title"), jsonObject.getString("desc"), jsonObject.getString("tag"));
} catch (JSONException e) {
e.printStackTrace();
}
} while (cursor.moveToNext());
adapter.update();
}
}
});
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.show();
}else {
Intent intent = new Intent(this, MyService.class);
name = this.getSharedPreferences("my_preferences",MODE_PRIVATE).getString("name","no_name");
ip = this.getSharedPreferences("my_preferences",MODE_PRIVATE).getString("ip","no_ip");
intent.putExtra("name",name);
intent.putExtra("ip",ip);
startService(intent);
ListView listView = (ListView) findViewById(R.id.listView);
adapter = new CustomAdapter(this);
listView.setAdapter(adapter);
IntentFilter filter = new IntentFilter();
filter.addAction(MyService.TRANSACTION_DONE);
registerReceiver(myReceiver, filter);
new Handler().post(new Runnable() {
#Override
public void run() {
if (MyService.myDataBase == null) return;
Cursor cursor = MyService.myDataBase.rawQuery("SELECT * FROM messages", null);
int messageColumn = cursor.getColumnIndex("message");
cursor.moveToFirst();
if (cursor != null && (cursor.getCount() > 0)) {
do {
String message = cursor.getString(messageColumn);
try {
JSONObject jsonObject = new JSONObject(message);
adapter.add(jsonObject.getString("title"), jsonObject.getString("desc"), jsonObject.getString("tag"));
} catch (JSONException e) {
e.printStackTrace();
}
} while (cursor.moveToNext());
adapter.update();
}
}
});
}
}
#Override
protected void onDestroy() {
if (myReceiver != null) {
unregisterReceiver(myReceiver);
myReceiver = null;
}
super.onDestroy();
}
private BroadcastReceiver myReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
String message = intent.getStringExtra("message");
Toast.makeText(MainActivity.this,message,Toast.LENGTH_LONG).show();
JSONObject jsonObject = null;
try {
jsonObject = new JSONObject(message);
if(jsonObject.has("remove")){
adapter.remove(jsonObject.getString("remove"));
adapter.update();
}else {
adapter.add(jsonObject.getString("title"), jsonObject.getString("desc"), jsonObject.getString("tag"));
adapter.update();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
};
class CustomAdapter extends BaseAdapter {
private LayoutInflater inflater;
private ArrayList<ListViewData> objects;
public void add(String title, String desc, String tag) {
objects.add(new ListViewData(title, desc, tag));
}
public void remove(String tag){
for(ListViewData data : objects){
if(data.getTag().equals(tag)){
objects.remove(data);
break;
}
}
}
public void update(){
notifyDataSetChanged();
}
private class ViewHolder {
TextView title;
TextView description;
Button resolve;
Button subscribe;
Button unSubscribe;
}
public CustomAdapter(Context context) {
inflater = LayoutInflater.from(context);
objects = new ArrayList<>();
}
public int getCount() {
return objects.size();
}
public ListViewData getItem(int position) {
return objects.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.custom_list_layout, null);
holder.title = (TextView) convertView.findViewById(R.id.title);
holder.description = (TextView) convertView.findViewById(R.id.desc);
holder.resolve = (Button) convertView.findViewById(R.id.resolve);
holder.subscribe = (Button) convertView.findViewById(R.id.subscribe);
holder.unSubscribe = (Button) convertView.findViewById(R.id.unsubscribe);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.title.setText(objects.get(position).getTitle());
holder.description.setText(objects.get(position).getDescription());
holder.resolve.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
final AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Title");
final View viewInflated = getLayoutInflater().inflate(R.layout.custom_dialog2, null);
builder.setView(viewInflated);
// Set up the buttons
builder.setPositiveButton("Publish", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
EditText editText = (EditText) viewInflated.findViewById(R.id.name);
EditText editText2 = (EditText) viewInflated.findViewById(R.id.destination);
String name = editText.getText().toString().trim();
String destination = editText2.getText().toString().trim();
JSONObject jsonObject = new JSONObject();
try {
jsonObject.accumulate("name", name);
jsonObject.accumulate("destination", destination);
jsonObject.accumulate("resolve",objects.get(position).getTag());
} catch (JSONException e) {
e.printStackTrace();
}
Intent intent = new Intent(MainActivity.this,MyService.class);
intent.putExtra("message",jsonObject.toString());
startService(intent);
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.show();
}
});
holder.subscribe.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String tag = objects.get(position).getTag();
try {
Intent intent = new Intent(MainActivity.this,MyService.class);
intent.putExtra("message",new JSONObject().accumulate("subscribe",tag).accumulate("name",name).toString());
startService(intent);
} catch (JSONException e) {
e.printStackTrace();
}
}
});
holder.unSubscribe.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String tag = objects.get(position).getTag();
try {
Intent intent = new Intent(MainActivity.this,MyService.class);
intent.putExtra("message",new JSONObject().accumulate("unsubscribe",tag).accumulate("name",name).toString());
startService(intent);
} catch (JSONException e) {
e.printStackTrace();
}
}
});
return convertView;
}
}
}
class MyPreferences {
private static final String MY_PREFERENCES = "my_preferences";
public static boolean isFirst(Context context){
final SharedPreferences reader = context.getSharedPreferences(MY_PREFERENCES, Context.MODE_PRIVATE);
final boolean first = reader.getBoolean("is_first", true);
if(first){
final SharedPreferences.Editor editor = reader.edit();
editor.putBoolean("is_first", false);
editor.commit();
}
return first;
}
}

Activity cannot be cast to Interface (ClassCastException)

I'm currently getting a ClassCastException in my android app caused by "activity cannot be cast to interface".
Here is my code:
Logcat says the Exception is thrown in the onAttach part in MovieGridFragment on the line "this.clickListener = (clickInterfaceHelper) context;".
My Interface:
public interface clickInterfaceHelper {
void clickOnItem(int id);
void favoriteMovieItem(int movieId); }
The Fragment Class:
public class MovieGridFragment extends Fragment {
public clickInterfaceHelper clickListener;
private int index;
private GridView movieGridView;
public List<movieData> movieDataList = new ArrayList<>();
public MovieGridFragment() {} //empty constructor
#Override
public void onAttach(Context context) {
this.clickListener = (clickInterfaceHelper) context;
super.onAttach(context);
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
if(savedInstanceState != null) {
if (!movieDataList.isEmpty()) {
movieDataList = Arrays.asList((movieData[]) savedInstanceState.getSerializable("OLDMOVIEDATA"));
}
}
super.onCreate(savedInstanceState);
}
The MainActivity:
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
setHasOptionsMenu(true);
View rootView = inflater.inflate(R.layout.movie_display_fragment, container, false);
movieGridView = (GridView) rootView.findViewById(R.id.gv_movie_display);
movieAdapter adapter = new movieAdapter(getActivity(),movieDataList);
adapter.notifyDataSetChanged();
movieGridView.setAdapter(adapter);
movieGridView.setSelection(index);
movieGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if(clickListener != null)
clickListener.clickOnItem(position);
}
});
return rootView;
}
#Override
public void onSaveInstanceState(Bundle outState) {
index = movieGridView.getFirstVisiblePosition();
outState.putSerializable("OLDMOVIEDATA",movieData.movieDataArray);
super.onSaveInstanceState(outState);
}}
and mainactivity:
public class MainActivity extends AppCompatActivity implements clickInterfaceHelper {
public static String sorterString = null;
public static String urlBase = "https://api.themoviedb.org/3/movie/";
public static String urlFinal = null;
RequestQueue requestQueue;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if(savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.activity_container, new MovieGridFragment())
.commit();
movieData.movieDataPosition = 0;
}
if(savedInstanceState != null) {
sorterString = savedInstanceState.getString("SORTER");
}
if(savedInstanceState == null)
movieData.movieDataPosition = 0;
if(sorterString==null)
sorterString="popular?";
if(sorterString!="favorite" && sorterString!=null) {
if(networkChecker.isNetworkAvailableChecker(this)) {
movieRequest();
}
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu_act, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if(id == R.id.m_popularity_action) {
if(sorterString != "popular?") {
sorterString = "popular?";
if(networkChecker.isNetworkAvailableChecker(this))
movieRequest();
}
return true;
}
if(id == R.id.m_action_voter) {
if(sorterString != "top_rated?") {
sorterString = "top_rated?";
if(networkChecker.isNetworkAvailableChecker(this))
movieRequest();
}
return true;
}
if(id == R.id.m_favorite_btn) {
if(sorterString != "favorite") {
SQLiteOpenHelper helper = new movieDataDbHelper(this);
SQLiteDatabase database = helper.getReadableDatabase();
Cursor cursor= database.query(movieDataContract.contractEntry.TABLE_NAME,
new String[] {
movieDataContract.contractEntry.ID,
movieDataContract.contractEntry.IMG_PATH},null,null,null,null,null);
if(cursor.getCount() == 0) {
Toast.makeText(this, "there are no favorite movies yet!",Toast.LENGTH_SHORT).show();
} else {
sorterString = "favorite";
showFavoriteFragment();
}
database.close();
helper.close();
cursor.close();
}
return true;
}
return super.onOptionsItemSelected(item);
}
public void showFavoriteFragment() {
favoriteMoviesDetailsFragment fragment = new favoriteMoviesDetailsFragment();
try {
getFragmentManager().beginTransaction().replace(R.id.activity_container,fragment).commit();
} catch (Exception e) {
e.printStackTrace();
}
}
#Override
public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState) {
outState.putString("SORTER", sorterString);
outState.putInt("POSITION",movieData.movieDataPosition);
super.onSaveInstanceState(outState, outPersistentState);
}
public void movieRequest() {
urlFinal = urlBase + sorterString + movieData.apiKey;
urlFinal.trim();
requestQueue = Volley.newRequestQueue(this);
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, urlFinal, null, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray array = response.getJSONArray("results");
movieData.movieDataArray = new movieData[array.length()];
for (int i = 0; i < array.length(); i++) {
movieData movie = new movieData();
JSONObject jsonObject = array.getJSONObject(i);
//movie.setPosition(i);
movie.setMovieId(jsonObject.getString("id"));
movie.setMovieImagePath(jsonObject.getString("poster_path"));
movie.setMovieTitle(jsonObject.getString("original_title"));
movie.setMoviePlot(jsonObject.getString("overview"));
movie.setMovieVoting(jsonObject.getString("vote_average"));
movie.setMovieReleaseDate(jsonObject.getString("release_date"));
movieData.movieDataArray[i] = movie;
}
MovieGridFragment gridFragment = new MovieGridFragment();
gridFragment.movieDataList = Arrays.asList(movieData.movieDataArray); //hier wird datalist eigentlich zugewiesen
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.activity_container, gridFragment);
try {
transaction.commitAllowingStateLoss();
} catch (Exception e) {
e.printStackTrace();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.e("volley", String.valueOf(error));
}
}
);
requestQueue.add(jsonObjectRequest);
}
#Override
public void clickOnItem(int id) {
movieData.movieDataPosition = id;
if(movieData.movieDataArray == null) {
movieRequest();
} else {
Intent intent = new Intent(this, detailsActivity.class);
intent.putExtra("FRAGMENT","MOVIE");
startActivity(intent);
}
}
#Override
public void favoriteMovieItem(int movieId) {
movieData.dbPosition = movieId;
Intent intent = new Intent(this,detailsActivity.class);
intent.putExtra("FRAGMENT","favorite");
startActivity(intent);
} }

You can try this
this.clickListener = (MainActivity) getActivity();
You get the FragmentActivity and cast it into your MainActivity
EDIT:
I suggest you to add a function in your fragment like :
public void setListener(clickInterfaceHelper listener) {
this.clickListener = listener;
}
And in your activity :
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if(savedInstanceState == null) {
MovieGridFragment fragment = new MovieGridFragment();
fragment.setListener(this); // some change here
getSupportFragmentManager().beginTransaction()
.add(R.id.activity_container, fragment)
.commit();
movieData.movieDataPosition = 0;
}
if(savedInstanceState != null) {
sorterString = savedInstanceState.getString("SORTER");
}
if(savedInstanceState == null)
movieData.movieDataPosition = 0;
if(sorterString==null)
sorterString="popular?";
if(sorterString!="favorite" && sorterString!=null) {
if(networkChecker.isNetworkAvailableChecker(this)) {
movieRequest();
}
}
}
.... no relevant functions
public void movieRequest() {
urlFinal = urlBase + sorterString + movieData.apiKey;
urlFinal.trim();
requestQueue = Volley.newRequestQueue(this);
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, urlFinal, null, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray array = response.getJSONArray("results");
movieData.movieDataArray = new movieData[array.length()];
for (int i = 0; i < array.length(); i++) {
movieData movie = new movieData();
JSONObject jsonObject = array.getJSONObject(i);
//movie.setPosition(i);
movie.setMovieId(jsonObject.getString("id"));
movie.setMovieImagePath(jsonObject.getString("poster_path"));
movie.setMovieTitle(jsonObject.getString("original_title"));
movie.setMoviePlot(jsonObject.getString("overview"));
movie.setMovieVoting(jsonObject.getString("vote_average"));
movie.setMovieReleaseDate(jsonObject.getString("release_date"));
movieData.movieDataArray[i] = movie;
}
MovieGridFragment gridFragment = new MovieGridFragment();
gridfragment.setListener(this); // some change here
gridFragment.movieDataList = Arrays.asList(movieData.movieDataArray); //hier wird datalist eigentlich zugewiesen
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.activity_container, gridFragment);
try {
transaction.commitAllowingStateLoss();
} catch (Exception e) {
e.printStackTrace();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.e("volley", String.valueOf(error));
}
}
);
requestQueue.add(jsonObjectRequest);
}
Hope this helps.

The context passed in is not necessarily your activity. It could be a wrapper around it with various theming and other overrides. You can never assume that when passed a Context, you're passed an Activity. If you need a reference to a click handler, write a setClickHandler function and call it explicitly.
Even if it is the Activity, the app doesn't know that- at that point its a Context. You'd need to explicitly cast it, which may not work (and may work on some versions of the OS and not others) due to paragraph 1.

Try to put your interface inside fragment class.
public class MovieGridFragment extends Fragment {
public clickInterfaceHelper clickListener;
private int index;
private GridView movieGridView;
public List<movieData> movieDataList = new ArrayList<>();
public MovieGridFragment() {} //empty constructor
#Override
public void onAttach(Context context) {
this.clickListener = (clickInterfaceHelper) context;
super.onAttach(context);
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
if(savedInstanceState != null) {
if (!movieDataList.isEmpty()) {
movieDataList = Arrays.asList((movieData[]) savedInstanceState.getSerializable("OLDMOVIEDATA"));
}
}
super.onCreate(savedInstanceState);
}
public interface clickInterfaceHelper {
void clickOnItem(int id);
void favoriteMovieItem(int movieId);
}
}

To all android beginners, you can use the interface like below-mentioned way.
Define an Interface,
public interface CallBack {
String stringValue(String s);
}
In Fragment,
Callback mCallback;
In onAttach(Context context) method of your fragment,
mCallback = (Callback) context; // Casting to the activity
mcallback.stringValue("Your message");
Then in your Activity, you must implement the interface else you will get
classcastException
public class MainActivity implements CallBack{
#Override
public String stringValue(String s) {
// Here you will get the value from the fragment
return s;
}
}
It's not advisable to pass values between two fragments directly using interfaces. You should use the activity as a mediator while passing values.

in android version 7.0 listview java.lang.NullPointerException: Attempt to get length of null array but 5.1 v ok

This is my activity class When I use android version 7.0 it causes java.lang.NullPointerException: Attempt to get length of null array
But when use android version 5.0 or 5.1 its run smothly
public class AdmitedPt extends AppCompatActivity {
ListView listView;
EditText inputSearch;
ProgressDialog pDialog;
private ProgressBar bar;
AdmitedPatientAdapter adapter;
private ArrayList<AdmitedPatient> myPatientList = new ArrayList<AdmitedPatient>();
#Override
public void onBackPressed() {
super.onBackPressed();
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_admitedpatientlist);
Toolbar myToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(myToolbar);
myToolbar.setLogo(R.drawable.icon1);//set logo beside the Title
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);//for stop automatic keybord opening
bar = (ProgressBar) this.findViewById(R.id.progressBar);
inputSearch = (EditText) findViewById(R.id.inputSearch);
listView = (ListView) findViewById(R.id.admitedPatientView);
// onl();
new HttpRequest(this).execute();
// Add Text Change Listener to EditText
inputSearch.addTextChangedListener(new TextWatcher() {
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// Call back the Adapter with current character to Filter
adapter.getFilter().filter(s.toString());
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void afterTextChanged(Editable s) {
}
});
}
public void scanCustomScanner(View view) {
new IntentIntegrator(this).setOrientationLocked(false).setCaptureActivity(CustomScannerActivity.class).initiateScan();
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
if (result != null) {
if (result.getContents() == null) {
Log.d("MainActivity", "Cancelled scan");
Toast.makeText(this, "Cancelled", Toast.LENGTH_LONG).show();
} else {
Log.d("MainActivity", "Scanned");
Toast.makeText(this, "Scanned: " + result.getContents(), Toast.LENGTH_LONG).show();
inputSearch.setText(result.getContents());
}
} else {
// This is important, otherwise the result will not be passed to the fragment
super.onActivityResult(requestCode, resultCode, data);
}
}
private boolean haveInternet() {
NetworkInfo info = ((ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE)).getActiveNetworkInfo();
if (info == null || !info.isConnected()) {
return false;
}
if (info.isRoaming()) {
// here is the roaming option you can change it if you want to disable internet while roaming, just return false
return true;
}
return true;
}
public class HttpRequest extends AsyncTask<Void, Void, Object[]> {
Object resultObject[];
Context context;
ProgressDialog dialog;
public HttpRequest(Context context) {
this.context = context;
}
#Override
protected void onPreExecute() {
bar.setVisibility(View.VISIBLE);
}
Gson gson = new Gson();
public Object[] findBedDetails() {
CasesData c = new CasesData(context);
try {
URL url = new URL(String.format(Const.URL_IPD_ADMITED));
// String testUrl = loginUrl.substring(loginUrl.lastIndexOf("/") + 1, loginUrl.length());
System.out.println("Test Url :" + url);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
System.out.println("Connection stutus :" + connection.getResponseCode());
BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String inputLine;
StringBuffer response1 = new StringBuffer();
System.out.println("Response :" + response1.toString());
while ((inputLine = in.readLine()) != null) {
response1.append(inputLine);
inputLine = null;
}
in.close();
String response = response1.toString();
c.setIpdadmit(response);
resultObject = gson.fromJson(response, AdmitedPatient[].class);
} catch (ConnectException e) {
Log.e("MYAPP", "exception", e);
resultObject = gson.fromJson(c.getIpdadmit(), AdmitedPatient[].class);
} catch (Exception e) {
}
return resultObject;
}
#Override
protected void onPostExecute(Object[] objects) {
AdmitedPatient[] pt = (AdmitedPatient[]) objects;
for (AdmitedPatient a : pt) {
myPatientList.add(new AdmitedPatient(a.getADMISSION_ID(), a.getFNAME(), a.getAGE()));
}
myPatientList.add(new AdmitedPatient("LS1611001297", "KAMAL", "50Y"));
//Error show in this line java.lang.NullPointerException: Attempt to get length of null array
adapter = new AdmitedPatientAdapter((Activity) context, myPatientList);
listView.setAdapter(adapter);
bar.setVisibility(View.GONE);
}
#Override
protected Object[] doInBackground(Void... params) {
return this.findBedDetails();
}
}
}
This is my adapter class:
public class AdmitedPatientAdapter extends BaseAdapter implements Filterable {
public ArrayList<AdmitedPatient> mDisplayedValues;
public ArrayList<AdmitedPatient> mOriginalValues;
Activity activity;
public AdmitedPatientAdapter(Activity activity, ArrayList<AdmitedPatient> list) {
this.activity = activity;
this.mDisplayedValues = list;
this.mOriginalValues=list;
}
#Override
public int getCount() {
return mDisplayedValues.size();
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position;
}
private class ViewHolder {
LinearLayout llContainer;
TextView textView1;
TextView textView2;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder = null;
LayoutInflater inflater = activity.getLayoutInflater();
if (convertView == null) {
convertView = inflater.inflate(R.layout.admitpatient_listview, null);
viewHolder = new ViewHolder();
viewHolder.llContainer = (LinearLayout)convertView.findViewById(R.id.llContainer);
viewHolder.textView1 = (TextView) convertView.findViewById(R.id.column1);
viewHolder.textView2 = (TextView) convertView.findViewById(R.id.column2);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.textView1.setText(mDisplayedValues.get(position).ADMISSION_ID);
viewHolder.textView2.setText(mDisplayedValues.get(position).FNAME);
viewHolder.llContainer.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent it=new Intent(activity,CollapseView.class);
Bundle bundle = new Bundle();
bundle.putSerializable("my object", mDisplayedValues.get(position));
it.putExtras(bundle);
activity.startActivity(it);
}
});
return convertView;
}
#Override
public Filter getFilter() {
Filter filter = new Filter() {
#SuppressWarnings("unchecked")
#Override
protected void publishResults(CharSequence constraint, FilterResults results) {
mDisplayedValues = (ArrayList<AdmitedPatient>) results.values; // has the filtered values
notifyDataSetChanged(); // notifies the data with new filtered values
}
#Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults(); // Holds the results of a filtering operation in values
ArrayList<AdmitedPatient> FilteredArrList = new ArrayList<AdmitedPatient>();
if (mOriginalValues == null) {
mOriginalValues = new ArrayList<AdmitedPatient>(mDisplayedValues); // saves the original data in mOriginalValues
}
if (constraint == null || constraint.length() == 0) {
results.count = mOriginalValues.size();
results.values = mOriginalValues;
} else {
constraint = constraint.toString().toLowerCase();
for (int i = 0; i < mOriginalValues.size(); i++) {
String data = mOriginalValues.get(i).ADMISSION_ID;
if (data.toLowerCase().startsWith(constraint.toString())) {
FilteredArrList.add(new AdmitedPatient(mOriginalValues.get(i).ADMISSION_ID, mOriginalValues.get(i).FNAME,mOriginalValues.get(i).AGE));
}
}
results.count = FilteredArrList.size();
results.values = FilteredArrList;
}
return results;
}
};
return filter;
}
}