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RecyclerView empty after data update

I am developing Android app which obtains information about restaurants from server and shows them in RecyclerView. When first package of information is obtained from server, everything works as expected, but, when I change search criteria and request new package of information from server, RecyclerView becomes blank. I used Toasts to debug what is coming from server and I am convinced that data is properly formatted. Also, variables that are used for accepting the data are also properly handled in code, according to my observations. Do you maybe know why my RecyclerView is empty when second package of data should be shown? Here is the code.
AfterLoginActivity.java
public class AfterLoginActivity extends AppCompatActivity {
/* interface main elements */
LinearLayout afterLoginLayout;
LinearLayout restaurantListLayout;
EditText restaurantEditText;
Button findRestaurantButton;
LoadingDialog loadingDialog;
AlphaAnimation loadingAnimation;
RecyclerView restaurantsRecyclerView;
int recycler_set = 0;
Button signOutButton;
GoogleSignInClient mGoogleSignInClient;
MyAdapter myAdapter = null;
/* server-client communication data */
public static String UploadUrl = "https://gdedakliknem.com/klopator.php";
public static String[] received;
String restaurants[] = new String[40];
String logos_as_strings[] = new String[40];
Bitmap logos[] = new Bitmap[40];
int num_of_elements = 0;
int data_received = 0;
/* user data */
String person_email;
String person_name;
String restaurant;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_after_login);
/* interface main elements */
afterLoginLayout = findViewById(R.id.afterLoginLayout);
restaurantListLayout = findViewById(R.id.restaurantListLayout);
restaurantEditText = findViewById(R.id.restaurantEditText);
findRestaurantButton = findViewById(R.id.findRestaurantButton);
restaurantsRecyclerView = findViewById(R.id.restaurantsRecyclerView);
signOutButton = findViewById(R.id.signOutButton);
loadingAnimation = new AlphaAnimation(1F, 0.8F);
loadingDialog = new LoadingDialog(AfterLoginActivity.this);
/* UPDATING INTERFACE ELEMENTS */
/* execution thread */
final Handler handler = new Handler();
final int delay = 2000; // 1000 milliseconds == 1 second
handler.postDelayed(new Runnable() {
public void run() {
/* check if recycler view is set */
if(recycler_set == 0){
/* if not, check if there is data to fil it with */
if(data_received == 1){
/* convert received strings to images */
for(int i = 0; i < num_of_elements; i++){
logos[i] = stringToBitmap(logos_as_strings[i]);
}
/* fill interface elements */
loadingDialog.dismissDialog();
myAdapter = new MyAdapter(AfterLoginActivity.this, restaurants, logos, num_of_elements);
restaurantsRecyclerView.setAdapter(myAdapter);
restaurantsRecyclerView.setLayoutManager(new LinearLayoutManager(AfterLoginActivity.this));
afterLoginLayout.setVisibility(View.GONE);
restaurantListLayout.setVisibility(View.VISIBLE);
recycler_set = 1;
}
}
handler.postDelayed(this, delay);
}
}, delay);
/* catch restaurant name from user's entry */
findRestaurantButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
restaurant = restaurantEditText.getText().toString();
if(!restaurant.isEmpty()){
view.startAnimation(loadingAnimation);
loadingDialog.startLoadingDialog();
sendRequest();
} else{
Toast.makeText(AfterLoginActivity.this, "Unesite naziv restorana!", Toast.LENGTH_LONG).show();
}
}
});
/* enable signing out */
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestEmail()
.build();
mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
signOutButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.signOutButton:
signOut();
break;
}
}
});
/* obtaining email */
GoogleSignInAccount acct = GoogleSignIn.getLastSignedInAccount(this);
if (acct != null) {
person_email = acct.getEmail();
person_name = acct.getDisplayName();
}
}
#Override
public void onBackPressed() {
afterLoginLayout.setVisibility(View.VISIBLE);
restaurantsRecyclerView.setVisibility(View.GONE);
data_received = 0;
recycler_set = 0;
}
private void signOut() {
mGoogleSignInClient.signOut()
.addOnCompleteListener(this, new OnCompleteListener<Void>() {
#Override
public void onComplete(#NonNull Task<Void> task) {
Toast.makeText(AfterLoginActivity.this, "Signed out", Toast.LENGTH_LONG).show();
finish();
}
});
}
public void sendRequest(){
StringRequest stringRequest = new StringRequest(Request.Method.POST, UploadUrl, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject jsonObject = new JSONObject(response);
String Response = jsonObject.getString("response");
if (Response.equals("Restaurant not found")){
loadingDialog.dismissDialog();
Toast.makeText(getApplicationContext(), "Uneti restoran ne postoji u sistemu! Proverite da li ste dobro napisali naziv", Toast.LENGTH_LONG).show();
} else{
received = Response.split(";");
if (received.length > 0){
data_received = 1;
num_of_elements = received.length / 2;
//Toast.makeText(getApplicationContext(), "num of elements: " + num_of_elements, Toast.LENGTH_LONG).show();
for(int i = 0; i < num_of_elements; i++){
logos_as_strings[i] = received[i*2];
restaurants[i] = received[i*2+1];
//Toast.makeText(getApplicationContext(), "restaurants: " + restaurants, Toast.LENGTH_LONG).show();
}
} else{
loadingDialog.dismissDialog();
Toast.makeText(getApplicationContext(), "Greška u prijemu", Toast.LENGTH_LONG).show();
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(final VolleyError error) {
//volleyError = error;
}
})
{
#Override
protected Map<String, String> getParams() throws AuthFailureError {
//Toast.makeText(getApplicationContext(), "get params", Toast.LENGTH_LONG).show();
Map<String, String> params = new HashMap<>();
params.put("control", "find_restaurant");
params.put("restaurant", restaurant);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(AfterLoginActivity.this);
requestQueue.add(stringRequest);
}
public static Bitmap stringToBitmap(String encodedString) {
try {
byte[] encodeByte = Base64.decode(encodedString, Base64.DEFAULT);
return BitmapFactory.decodeByteArray(encodeByte, 0, encodeByte.length);
} catch (Exception e) {
e.getMessage();
return null;
}
}
MyAdapter.java
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
String restaurants[];
Bitmap logos[];
Context context;
int num_of_elements;
public MyAdapter(Context ct, String rests[], Bitmap lgs[], int num){
context = ct;
restaurants = rests;
logos = lgs;
num_of_elements = num;
Toast.makeText(context, Integer.toString(restaurants.length), Toast.LENGTH_LONG).show();
for(int i = 0; i < restaurants.length; i++){
Toast.makeText(context, restaurants[i], Toast.LENGTH_SHORT).show();
}
}
#NonNull
#Override
public MyViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(context);
View view = layoutInflater.inflate(R.layout.restaurant_item_layout, parent, false);
return new MyViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull MyAdapter.MyViewHolder holder, int position) {
holder.restaurantNameTextView.setText(restaurants[position]);
holder.restaurantLogoImageView.setImageBitmap(logos[position]);
holder.restaurantItemLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(context, AfterPickingRestaurantActivity.class);
ByteArrayOutputStream bs = new ByteArrayOutputStream();
logos[position].compress(Bitmap.CompressFormat.PNG, 50, bs);
intent.putExtra("byteArray", bs.toByteArray());
intent.putExtra("picked_restaurant_name", restaurants[position]);
context.startActivity(intent);
}
});
}
#Override
public int getItemCount() {
/*
int i = 0;
if (restaurants != null){
while(restaurants[i] != null){
i++;
}
} else{
i = restaurants.length;
}
return i;
*/
return num_of_elements;
}
public class MyViewHolder extends RecyclerView.ViewHolder {
TextView restaurantNameTextView;
ImageView restaurantLogoImageView;
LinearLayout restaurantItemLayout;
public MyViewHolder(#NonNull View itemView) {
super(itemView);
restaurantNameTextView = itemView.findViewById(R.id.restaurantNameTextView);
restaurantLogoImageView = itemView.findViewById(R.id.restaurantLogoImageView);
restaurantItemLayout = itemView.findViewById(R.id.restaurantItemLayout);
}
}

Add this lines after getting new data
myAdapter.notifyDataSetChanged()

Your Adapter Already set with RecyclerView in OnCreate Method.
so when'er you click on findRestaurantButton you just get Resturent data from server but collected data not pass in adapter so thats why to getting blank adapter..
Just put this line in your onResponse after set data in array..
myAdapter.notifyDataSetChanged()

I found out where is the mistake. If you take a look at the section where overriding of back button click is happening, I by mistake set to GONE recyclerView itself:
restaurantsRecyclerView.setVisibility(View.GONE);
instead of LinearLayout in which recyclerView is contained. Desired action was:
restaurantListLayout.setVisibility(View.GONE);
P.S. Everything works without calling notifyDataSetChanged(), I just create a new instance of myAdapater each time when I receive new data. I hope Garbage Collector is doing its job :)
Thanks everyone on help!

How to handle loading large amounts of data in android

I have an activity with a button upon clicking which opens a new activity with 3 fragments with tab layout, The first fragment loads files from the internal storage in recyclerview, 2nd one loads installed apps in recyclerview and the 3rd loads contacts in a recyclerview, But the problem I'm facing is that when I click the button to launch the activity it takes 2-3 seconds to launch the activity & I tested it on a device which contained a lot of apps and contacts it crashed the app and didn't opened the activity, I think this is because it is taking time to load all the data at once, How can I solve this problem?
This is the code from the fragments
FileListFragment.java
public class FileListFragment extends Fragment implements FilesStateManager {
private static final String TAG = "FileListFragment";
RecyclerView fileListRecyclerView,currentPathRecyclerView;
TextView currentPathTextView;
ArrayList<FileObject> fileObjects = new ArrayList<>();
ArrayList<FileObject> currentFolders = new ArrayList<>();
static ArrayList<FileObject> selectedFiles = new ArrayList<>();
String currentPath = "";
String initialPath = "";
String pathToShow = "/";
RelativeLayout grantPermissionContainer;
Button grantPermissionButton;
FileManager fileManager;
static DataSelectedManager dataSelectedManager;
public FileListFragment(DataSelectedManager dataSelectedManager) {
this.dataSelectedManager = dataSelectedManager;
}
private final int PERMISSION_CODE = 100;
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_file_list,container,false);
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
currentPathRecyclerView = view.findViewById(R.id.current_folder_recyclerview);
fileListRecyclerView = view.findViewById(R.id.folder_list_recyclerview);
grantPermissionContainer = view.findViewById(R.id.grant_permission_container);
grantPermissionButton = view.findViewById(R.id.grant_permission_button);
init();
}
private void init(){
fileManager = new FileManager(getContext());
if (ContextCompat.checkSelfPermission(getContext(), Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(getContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
grantPermissionContainer.setVisibility(View.VISIBLE);
fileListRecyclerView.setVisibility(View.GONE);
}
grantPermissionButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (Build.VERSION.SDK_INT < 16) {
requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},PERMISSION_CODE);
} else {
requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE},PERMISSION_CODE);
}
}
});
try{
String path = getActivity().getExternalFilesDir(null).getPath();
currentPath = path.split("Android")[0];
initialPath = currentPath;
FileObject fileObject = new FileObject("/",initialPath,null,true,"none","0",false);
currentFolders.add(fileObject);
setupCurrentPathRecyclerView();
readFiles();
Log.d(TAG, "init: " + path);
}
catch (Exception e){
e.printStackTrace();
}
}
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions, #NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
Log.d(TAG, "onRequestPermissionsResult: Called");
if (requestCode == PERMISSION_CODE){
Log.d(TAG, "onRequestPermissionsResult: Codes matched");
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
Log.d(TAG, "onRequestPermissionsResult: Permission Granted");
grantPermissionContainer.setVisibility(View.GONE);
fileListRecyclerView.setVisibility(View.VISIBLE);
FileObject fileObject = new FileObject("/",initialPath,null,true,"none","0",false);
currentFolders.add(fileObject);
setupCurrentPathRecyclerView();
readFiles();
}
}
}
private void readFiles(){
fileObjects = fileManager.readFiles(currentPath,selectedFiles);
setupRecyclerView();
}
private void setupRecyclerView(){
FileListAdapter fileListAdapter = new FileListAdapter(fileObjects,selectedFiles,getContext(),this);
fileListRecyclerView.setAdapter(fileListAdapter);
fileListRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
}
private void setupCurrentPathRecyclerView(){
FolderPathAdapter folderPathAdapter = new FolderPathAdapter(currentFolders,getContext(),this);
currentPathRecyclerView.setAdapter(folderPathAdapter);
currentPathRecyclerView.setLayoutManager(new LinearLayoutManager(getContext(), LinearLayoutManager.HORIZONTAL,false));
currentPathRecyclerView.smoothScrollToPosition(currentFolders.size());
}
#Override
public void folderClicked(FileObject fileObject) {
currentPath = fileObject.getPath();
currentFolders.add(fileObject);
currentPathRecyclerView.getAdapter().notifyItemInserted(currentFolders.size() - 1);
currentPathRecyclerView.smoothScrollToPosition(currentFolders.size());
readFiles();
}
#Override
public void pathFolderClicked(FileObject fileObject) {
Log.d(TAG, "pathFolderClicked: Called");
if (!fileObject.getPath().equals(currentFolders.get(currentFolders.size() - 1).getPath())){
for (FileObject folder : currentFolders){
if (folder.getPath().equals(fileObject.getPath())){
int index = currentFolders.indexOf(folder) + 1;
int size = currentFolders.size();
currentFolders = new ArrayList<>(currentFolders.subList(0,index));
Log.d(TAG, "pathFolderClicked: Number of item " + (size - index) + " Index: " + index);
// currentPathRecyclerView.getAdapter().notifyItemRangeRemoved(index,size - index);
setupCurrentPathRecyclerView();
currentPath = currentFolders.get(currentFolders.size() - 1).getPath();
readFiles();
Log.d(TAG, "pathFolderClicked: Notified");
}
}
Log.d(TAG, "pathFolderClicked: " + Arrays.toString(currentFolders.toArray()));
}
}
#Override
public void fileSelected(FileObject fileObject) {
selectedFiles.add(fileObject);
dataSelectedManager.dataSelected();
}
#Override
public void fileDeselected(FileObject fileObject) {
ArrayList<FileObject> filesToRemove = new ArrayList<>();
for (FileObject fileObject1 : selectedFiles){
if (fileObject.getPath().equals(fileObject1.getPath())){
filesToRemove.add(fileObject1);
}
}
dataSelectedManager.dataDeSelected();
selectedFiles.removeAll(filesToRemove);
}
public static void triggerDataTransfer(){
dataSelectedManager.sendSelectedFiles(selectedFiles);
}
}
AppListFragment.java
public class AppListFragment extends Fragment implements AppsStateManager {
RecyclerView appListRecyclerView;
TextView selectAllTextView;
CheckBox selectAllCheckBox;
static ArrayList<App> apps = new ArrayList<>();
AppsManager appsManager;
static DataSelectedManager dataSelectedManager;
public AppListFragment(DataSelectedManager dataSelectedManager) {
this.dataSelectedManager = dataSelectedManager;
}
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_app_list,container,false);
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
appListRecyclerView = view.findViewById(R.id.app_recycler_view);
selectAllTextView = view.findViewById(R.id.select_all_text_view);
selectAllCheckBox = view.findViewById(R.id.select_all_checkbox);
appsManager = new AppsManager(getActivity().getPackageManager(),getActivity().getApplicationContext().getPackageName());
getInstalledApps();
setupRecyclerView();
selectAllCheckBox.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (!selectAllCheckBox.isChecked()){
for (App app : apps){
if (app.isSelected()){
app.setSelected(false);
dataSelectedManager.dataDeSelected();
}
}
}
else {
for (App app : apps){
if (!app.isSelected()){
app.setSelected(true);
dataSelectedManager.dataSelected();
}
}
}
appListRecyclerView.getAdapter().notifyDataSetChanged();
}
});
}
private void getInstalledApps(){
apps = appsManager.getInstalledApps();
selectAllTextView.setText("Select All (" + apps.size() + ")");
}
private void setupRecyclerView(){
AppListAdapter appListAdapter = new AppListAdapter(apps,getContext(),this);
appListRecyclerView.setAdapter(appListAdapter);
appListRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
}
#Override
public void deSelected() {
selectAllCheckBox.setChecked(false);
dataSelectedManager.dataDeSelected();
}
#Override
public void selected() {
dataSelectedManager.dataSelected();
}
public static void triggerDataTransfer(){
ArrayList<App> selectedApps = new ArrayList<>();
for (App app : apps){
if (app.isSelected()){
selectedApps.add(app);
}
}
dataSelectedManager.sendSelectedApps(selectedApps);
}
}
ContactListFragment.java
public class ContactListFragment extends Fragment implements ContactsStateManager {
private static final String TAG = "ContactListFragment";
static ArrayList<Contact> contacts = new ArrayList<>();
TextView selectAllTextView;
CheckBox selectAllRadioButton;
Button grantPermissionButton;
RelativeLayout grantPermissionLayout;
RecyclerView contactsRecyclerView;
ContactsManager contactsManager;
static DataSelectedManager dataSelectedManager;
public ContactListFragment(DataSelectedManager dataSelectedManager) {
this.dataSelectedManager = dataSelectedManager;
}
private final int PERMISSION_CODE = 101;
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_contact_list,container,false);
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
contactsRecyclerView = view.findViewById(R.id.contacts_recycler_view);
selectAllTextView = view.findViewById(R.id.select_all_text_view);
selectAllRadioButton = view.findViewById(R.id.select_all_checkbox);
grantPermissionLayout = view.findViewById(R.id.grant_permission_container);
grantPermissionButton = view.findViewById(R.id.grant_permission_button);
contactsManager = new ContactsManager(getActivity().getContentResolver());
selectAllRadioButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (!selectAllRadioButton.isChecked()){
for (Contact contact: contacts){
if (contact.isSelected()){
contact.setSelected(false);
dataSelectedManager.dataDeSelected();
}
}
}
else{
for (Contact contact: contacts){
if (!contact.isSelected()){
contact.setSelected(true);
dataSelectedManager.dataSelected();
}
}
}
contactsRecyclerView.getAdapter().notifyDataSetChanged();
}
});
if (ContextCompat.checkSelfPermission(getContext(), Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED){
grantPermissionLayout.setVisibility(View.VISIBLE);
contactsRecyclerView.setVisibility(View.GONE);
}
else{
readContacts();
setupRecyclerView();
}
grantPermissionButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
requestPermissions(new String[]{Manifest.permission.READ_CONTACTS},PERMISSION_CODE);
}
});
}
private void readContacts(){
contacts = contactsManager.getContacts();
selectAllTextView.setText("Select All (" + contacts.size() + ")");
}
private void setupRecyclerView(){
ContactListAdapter contactListAdapter = new ContactListAdapter(contacts,getContext(),this);
contactsRecyclerView.setAdapter(contactListAdapter);
contactsRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
}
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions, #NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
Log.d(TAG, "onRequestPermissionsResult: Called");
if (requestCode == PERMISSION_CODE){
Log.d(TAG, "onRequestPermissionsResult: Codes matched");
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
Log.d(TAG, "onRequestPermissionsResult: Permission Granted");
grantPermissionLayout.setVisibility(View.GONE);
readContacts();
contactsRecyclerView.setVisibility(View.VISIBLE);
setupRecyclerView();
}
}
}
#Override
public void deSelected() {
selectAllRadioButton.setChecked(false);
dataSelectedManager.dataDeSelected();
}
#Override
public void selected() {
dataSelectedManager.dataSelected();
}
public static void triggerDataTransfer(){
ArrayList<Contact> selectedContacts = new ArrayList<>();
for(Contact contact : contacts){
if (contact.isSelected()){
selectedContacts.add(contact);
}
}
dataSelectedManager.sendSelectedContacts(selectedContacts);
}
}
AppsManager.java
public class AppsManager {
PackageManager packageManager;
private String PACKAGE_NAME;
public AppsManager(PackageManager packageManager,String PACKAGE_NAME) {
this.packageManager = packageManager;
this.PACKAGE_NAME = PACKAGE_NAME;
}
public ArrayList<App> getInstalledApps(){
PackageManager packageManager = this.packageManager;
ArrayList<App> apps = new ArrayList<>();
List<PackageInfo> packs = packageManager.getInstalledPackages(0);
for (int i = 0; i < packs.size(); i++){
PackageInfo packageInfo = packs.get(i);
if ((!isSystemApp(packageInfo)) && !packageInfo.packageName.equals(PACKAGE_NAME)){
String appName = packageInfo.applicationInfo.loadLabel(packageManager).toString();
Drawable icon = packageInfo.applicationInfo.loadIcon(packageManager);
String packages = packageInfo.applicationInfo.packageName;
apps.add(new App(appName,icon,packages,false));
}
}
return apps;
}
private boolean isSystemApp(PackageInfo packageInfo){
return (packageInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0;
}
}
ContactsManager.java
public class ContactsManager{
ContentResolver contentResolver;
public ContactsManager(ContentResolver contentResolver) {
this.contentResolver = contentResolver;
}
public ArrayList<Contact> getContacts(){
ContentResolver cr = contentResolver;
ArrayList<Contact> contacts = new ArrayList<>();
Cursor cursor = cr.query(ContactsContract.Contacts.CONTENT_URI,null,null,null,ContactsContract.Contacts.DISPLAY_NAME + " ASC");
if (cursor.getCount() > 0){
while (cursor.moveToNext()){
String id = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
String name = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
String phone = "";
if (Integer.parseInt(cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0){
Cursor pCur = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = ?",
new String[]{id}, null);
while (pCur.moveToNext()) {
phone = pCur.getString(
pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
}
pCur.close();
}
Contact contact = new Contact(name,id,phone,false);
contacts.add(contact);
}
}
return contacts;
}
}
FileManager.java
public class FileManager {
private static final String TAG = "FileManager";
Context context;
public FileManager(Context context) {
this.context = context;
}
public ArrayList<FileObject> readFiles(String path, ArrayList<FileObject> selectedFiles){
ArrayList<FileObject> filesList = new ArrayList<>();
File file = new File(path);
File[] files = file.listFiles();
for (File file1 : files){
String name = file1.getName();
String filePath = file1.getAbsolutePath();
boolean isDirectory = file1.isDirectory();
String fileSize = "";
if (isDirectory){
int count = file1.listFiles().length;
if (count > 0){
fileSize = count + "";
}
}
else{
long fileSizeInBytes = file1.length();
long fileSizeInKB = fileSizeInBytes / 1024;
long fileSizeInMB = fileSizeInKB / 1024;
if (fileSizeInMB >= 1){
fileSize = fileSizeInMB + " MB";
}
else{
fileSize = fileSizeInKB + " KB";
}
}
boolean selected = isSelected(filePath,selectedFiles);
String extension = "";
if (isDirectory){
extension = "none";
}
else{
Log.d(TAG, "readFiles: " + filePath);
String[] splitArray = filePath.split("\\.");
Log.d(TAG, "readFiles: " + splitArray.length);
extension = splitArray[splitArray.length - 1];
}
Drawable icon;
if (isDirectory){
icon = context.getResources().getDrawable(R.drawable.ic_folder_skin_24dp);
}
else{
switch (extension){
case "pdf":
icon = context.getResources().getDrawable(R.drawable.ic_picture_as_pdf_red_24dp);
break;
default:
icon = context.getResources().getDrawable(R.drawable.ic_insert_drive_file_skin_24dp);
break;
}
}
FileObject fileObject = new FileObject(name,filePath,icon,isDirectory,extension,fileSize,selected);
filesList.add(fileObject);
}
return filesList;
}
boolean isSelected(String path, ArrayList<FileObject> selectedFiles){
boolean isSelected = false;
for (FileObject fileObject : selectedFiles){
if (fileObject.getPath().equals(path)){
isSelected = true;
}
}
return isSelected;
}
}

When you are performing heavy operations consider using Threads.

The application may be doing too much work on its main thread. (android studio emulator and real phone emulator )

firstly, i read all answers related with this problem but i didn't solve this error. My program is running but very laggy and slow. i tryed use smaller images and use async task but my problem is continued. here is my code
public class MainActivity extends AppCompatActivity {
RecyclerView recyclerView;
NotificationManager manager;
public Veri veri,veri1;
int x= 0;
private Timer autoUpdate;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
veri1 = new Veri();
x=veri1.getList().size();
recyclerView= (RecyclerView) findViewById(R.id.my_recycler_view);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
onResume();
new AsyncCaller().execute();
}
#Override
protected void onStart() {
super.onStart();
}
////////////////////////////////////////////
private class AsyncCaller extends AsyncTask<Void, Void, Void>
{
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected Void doInBackground(Void... params) {
autoUpdate = new Timer();
autoUpdate.schedule(new TimerTask() {
#Override
public void run() {
runOnUiThread(new Runnable() {
public void run() {
updateHTML();
}
});
}
}, 0, 60000);
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
}
}
////////////////////////////////////
private void updateHTML(){
// your logic here
RecyclerAdapter adapter=new RecyclerAdapter(this);
recyclerView.setAdapter(adapter);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
veri = new Veri();
int a = veri.getList().size();
if(a!=x){
generateNotification(MainActivity.this,"Listede Degisim Var");
}
x=a;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Take appropriate action for each action item click
switch (item.getItemId()) {
// search action
case R.id.action_location_found:
// location found
LocationFound();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
private void LocationFound() {
Intent i = new Intent(MainActivity.this, LocationFound.class);
startActivity(i);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.activity_main_actions, menu);
return super.onCreateOptionsMenu(menu);
}
private void generateNotification(Context context,String message){
int notificationId = 001;
Intent viewIntent = new Intent(context, MainActivity.class);
PendingIntent viewPendingIntent =
PendingIntent.getActivity(context, 0, viewIntent, 0);
NotificationCompat.Builder notificationBuilder =
(NotificationCompat.Builder) new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.dikat)
.setContentTitle("Bildirim")
.setContentText(message)
.setContentIntent(viewPendingIntent)
.setAutoCancel(true)
.setSound(Uri.parse("android.resource://"
+ context.getPackageName() + "/" + R.raw.bildirim))
.setVibrate(new long[] { 1000, 1000, 1000, 1000, 1000 });
NotificationManagerCompat notificationManager =
NotificationManagerCompat.from(context);
notificationManager.notify(notificationId, notificationBuilder.build());
}
}
here is my data class
public class Veri extends ActionBarActivity {
NotificationManager manager;
Notification myNotication;
String ip, db, un, passwords;
Connection connect,conn;
PreparedStatement stmt;
ResultSet rs;
TextView tv;
int position1=0;
Button b1;
ArrayList<String> data = new ArrayList<String>();
ArrayList<String> data2 = new ArrayList<String>();
public Veri(){
ip = "x.x.x.x";
un = "x";
passwords = "x";
db = "xxx";
connect = CONN(un, passwords, db, ip);
String query = "SELECT Adsoyad,(DATEPART(hour, BeklemeSuresi) * 3600) + (DATEPART(minute, BeklemeSuresi) * 60) + DATEPART(second, BeklemeSuresi) as SecondsFromMidnight,Durum FROM [dbo].[IslemiDevamEdenHasta] (1)";
try {
// connect = CONN(un, passwords, db, ip);
stmt = connect.prepareStatement(query);
rs = stmt.executeQuery();
while (rs.next()) {
int b = (int)rs.getInt("SecondsFromMidnight")/60;
if(b>50) {
String id = rs.getString("Adsoyad");
String id2 = rs.getString("Durum");
String full = id + " " + id2;
String a = "" + b;
data.add(full);
data2.add(a);
}
}
} catch (SQLException e) {
e.printStackTrace();
}
}
public ArrayList<String> getList() {
return data;
}
public ArrayList<String> getList2() {
return data2;
}
#SuppressLint("NewApi")
private Connection CONN(String _user, String _pass, String _DB,
String _server) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
Connection conn = null;
String ConnURL = null;
try {
Class.forName("net.sourceforge.jtds.jdbc.Driver");
ConnURL = "jdbc:jtds:sqlserver://" + _server + ";"
+ "databaseName=" + _DB + ";user=" + _user + ";password="
+ _pass + ";";
conn = DriverManager.getConnection(ConnURL);
} catch (SQLException se) {
Log.e("ERRO", se.getMessage());
} catch (ClassNotFoundException e) {
Log.e("ERRO", e.getMessage());
} catch (Exception e) {
Log.e("ERRO", e.getMessage());
}
return conn;
}
}
and here is my recycler class
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerViewHolder> {
public Veri veri = new Veri();
int sayi=0;
ArrayList<String> liste = veri.getList();
ArrayList<String> liste2 = veri.getList2();
static ArrayList<String> liste3 = new ArrayList<String>() ;
Context context;
LayoutInflater inflater;
public RecyclerAdapter(Context context) {
this.context=context;
inflater=LayoutInflater.from(context);
}
#Override
public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v=inflater.inflate(R.layout.item_list, parent, false);
RecyclerViewHolder viewHolder=new RecyclerViewHolder(v);
return viewHolder;
}
#Override
public void onBindViewHolder(RecyclerViewHolder holder, int position) {
liste3.add("a");
sayi = 0;
for (int j = 0; j < liste3.size(); j++) {
if (liste3.get(j).equals(liste.get(position))) {
sayi++;
}
if (sayi == 0) {
holder.tv1.setText(liste.get(position));
holder.tv2.setText(liste2.get(position));
holder.imageView.setOnClickListener(clickListener);
holder.imageView.setTag(holder);
} else {
holder.tv1.setText(liste.get(position));
holder.tv2.setText(liste2.get(position));
holder.imageView.setOnClickListener(clickListener);
holder.imageView.setImageResource(R.drawable.ic_checkin);
}
}
}
View.OnClickListener clickListener=new View.OnClickListener() {
#Override
public void onClick(View v) {
RecyclerViewHolder vholder = (RecyclerViewHolder) v.getTag();
int position = vholder.getPosition();
//Toast.makeText(context,"This is position "+position,Toast.LENGTH_LONG ).show();
vholder.imageView.setImageResource(R.drawable.ic_checkin);
liste3.add(liste.get(position));
}
};
#Override
public int getItemCount() {
return liste.size();
}
}
what is my problem??

you doing so much coding for loading image.There are some third party api so you can refer it. so it may be helpful to load your image easily and memory management control is handle by that api also here just refer this tutorial.

Custom Adapter with Search Not working

I tried to add textwatcher with filter class but it do not work plz help. I get the json array through the server using the url. the search(filter) doesnt work well.
public class CallDetails extends Activity {
SessionManager session;
ArrayList<Drivers> driverList = new ArrayList<Drivers>();
private List<Drivers> driverlist = null;
ListView listview;
ImageButton btback;
DriverAdapter dadapter;
String uid;
String name;
String email;
String odtyp;
static String oid;
Drivers driver;
private EditText editTextFilter;
private static String OUTBOX_URL ="";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.calldetails);
Intent i = getIntent();
oid =i.getStringExtra("orderId");
odtyp =i.getStringExtra("ordertype");
OUTBOX_URL ="http://www.gdrive.com/api/calldetails.php?id="+oid;
//managing session...
session = new SessionManager(getApplicationContext());
HashMap<String, String> user = session.getUserDetails();
name = user.get(SessionManager.KEY_NAME);
email = user.get(SessionManager.KEY_EMAIL);
uid = user.get(SessionManager.KEY_UID);
btback =(ImageButton)findViewById(R.id.btnBack);
btback.setVisibility(View.INVISIBLE);
// Locate the EditText in listview_main.xml
editTextFilter = (EditText)findViewById(R.id.editTextFilter);
editTextFilter.addTextChangedListener(new TextWatcher() {
#Override
public void afterTextChanged(Editable arg0) {
String text = editTextFilter.getText().toString().toLowerCase(Locale.getDefault());
dadapter.filter(text);
}
#Override
public void beforeTextChanged(CharSequence arg0, int arg1,
int arg2, int arg3){ /* to do*/ }
#Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) { /*to do*/ }
});
//populating view with data...
//driverList = new ArrayList<Drivers>();
new JSONAsyncTask().execute(OUTBOX_URL);
listview = (ListView)findViewById(R.id.drlist);
dadapter = new DriverAdapter(CallDetails.this, R.layout.list_item, driverList);
listview.setItemsCanFocus(false);
listview.setAdapter(dadapter);
//populating list ends
listview.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long id) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), driverList.get(position).getName(), Toast.LENGTH_LONG).show();
}
});
}
public void back(View v){
Intent back = new Intent(getApplicationContext(), SafetyDrive.class);
startActivity(back);
finish();
}
private class DriverAdapter extends ArrayAdapter<Drivers> {
Context context;
int Resource;
LayoutInflater inflater;
ArrayList<Drivers> driverList = new ArrayList<Drivers>();
public DriverAdapter(Context context, int layoutResourceId,ArrayList<Drivers> drs) {
super(context, layoutResourceId, drs);
//inflater = ((Activity) context).getLayoutInflater();
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
Resource = layoutResourceId;
driverList = drs;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
//Log.d("in ", "view start");
View item = convertView;
DriverWrapper DriverWrapper = null;
if (item == null) {
DriverWrapper = new DriverWrapper();
item = inflater.inflate(Resource, null);
DriverWrapper.ename = (TextView) item.findViewById(R.id.textName);
DriverWrapper.ephone = (TextView) item.findViewById(R.id.textPhone);
DriverWrapper.mkcall = (ImageButton) item.findViewById(R.id.btnphone);
item.setTag(DriverWrapper);
} else {
DriverWrapper = (DriverWrapper) item.getTag();
}
Drivers driver = driverList.get(position);
DriverWrapper.ename.setText("Name: " + driver.getName());
DriverWrapper.ephone.setText("Phone: " + driver.getPhone());
final String dp = driver.getPhone().trim();
DriverWrapper.mkcall.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
//making call..
//Log.e("no is", dp);
Intent callIntent = new Intent(Intent.ACTION_CALL);
callIntent.setData(Uri.parse("tel:" +dp));
//callIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(callIntent);
//finish();
}
});
return item;
}
class DriverWrapper {
TextView ename;
TextView ephone;
ImageButton mkcall;
//ImageButton msg;
}
// Filter Class
public void filter(String charText) {
charText = charText.toLowerCase(Locale.getDefault());
driverList.clear();
if (charText.length() == 0) {
driverList.addAll(driverList);
} else {
for (Drivers driver : driverList) {
if (driver.getName().toLowerCase(Locale.getDefault()).contains(charText)) {
driverList.add(driver);
}
}
}
notifyDataSetChanged();
}
}
class JSONAsyncTask extends AsyncTask {
ProgressDialog dialog;
#Override
protected void onPreExecute() {
super.onPreExecute();
dialog = new ProgressDialog(CallDetails.this);
dialog.setMessage("Loading, please wait");
dialog.show();
dialog.setCancelable(false);
}
#Override
protected Boolean doInBackground(String... urls) {
try {
//Log.d("in at-", "asynctask");
HttpGet httppost = new HttpGet(urls[0]);
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response = httpclient.execute(httppost);
// StatusLine stat = response.getStatusLine();
int status = response.getStatusLine().getStatusCode();
if (status == 200) {
HttpEntity entity = response.getEntity();
String data = EntityUtils.toString(entity);
JSONObject jsono = new JSONObject(data);
JSONArray jarray = jsono.getJSONArray("drivers");
if(jarray.length()!=0){
for (int i = 0; i < jarray.length(); i++) {
JSONObject object = jarray.getJSONObject(i);
Drivers driver = new Drivers();
driver.setPhone(object.getString("phone"));
driver.setName(object.getString("emp_name"));
driverList.add(driver);
}
}else{
driver = new Drivers();
driver.setPhone(" ");
driver.setName(" No Driver Place yet");
driverList.add(driver);
}
return true;
}
} catch (ParseException e1) {
e1.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
return false;
}
protected void onPostExecute(Boolean result) {
dialog.cancel();
btback.setVisibility(View.VISIBLE);
dadapter.notifyDataSetChanged();
if(result == false)
Toast.makeText(getApplicationContext(), "Unable to fetch data from server", Toast.LENGTH_LONG).show();
}
}
}
public class Drivers {
private String name;
private String phone;
public Drivers() {
}
public Drivers(String name, String phone) {
super();
this.name = name;
this.phone = phone;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
}

actually it wont filter because youve cleared the driverList and then in the else statement you loop to driverList which is already empty. the only thing you can do is create a backup list for the driversList and then use the backup list to get all data for filtering to the driverList.
Example Here:
// here is the backuplist
ArrayList<Drivers> backupList = new ArrayList<Drivers>();
// Filter Class
public void filter(String charText) {
charText = charText.toLowerCase(Locale.getDefault());
// actually its easy to just clear the backup list
// but due to reasons where users press backspace you have to load backup list only once
if(backupList.isEmpty()) {
backupList.addAll(driverList);
}
driverList.clear();
if (charText.length() == 0) {
driverList.addAll(backupList);
} else {
for (Drivers driver : backupList) {
if (driver.getName().toLowerCase(Locale.getDefault()).contains(charText)) {
driverList.add(driver);
}
}
}
notifyDataSetChanged();
}
Hope it helps :)

How to show rss feed in android widget

I have a very big problem guys. I have an app which fetches and parses the RSS feed from a blog, but I don't know how to put the results into my widget.
Here is the RSSListActivity which shows the rss feed correctly in it's own activity:
#Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
RSSItem data = itemlist.get(position);
Intent intent = new Intent(Intent.ACTION_VIEW,Uri.parse(data.link));
startActivity(intent);
}
private void retrieveRSSFeed(String urlToRssFeed,ArrayList<RSSItem> list)
{
try
{
URL url = new URL(urlToRssFeed);
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser parser = factory.newSAXParser();
XMLReader xmlreader = parser.getXMLReader();
RSSParser theRssHandler = new RSSParser(list);
xmlreader.setContentHandler(theRssHandler);
InputSource is = new InputSource(url.openStream());
xmlreader.parse(is);
}
catch (Exception e)
{
e.printStackTrace();
}
}
private class RetrieveRSSFeeds extends AsyncTask<Void, Void, Void>
{
private ProgressDialog progress = null;
#Override
protected Void doInBackground(Void... params) {
retrieveRSSFeed("http://blog.qubiz.com/index.php/feed",itemlist);
rssadaptor = new RSSListAdaptor(RSSListActivity.this, R.layout.rssitemview,itemlist);
return null;
}
#Override
protected void onCancelled() {
super.onCancelled();
}
#Override
protected void onPreExecute() {
progress = ProgressDialog.show(
RSSListActivity.this, null, "Loading RSS Feed... Please wait");
super.onPreExecute();
}
#Override
protected void onPostExecute(Void result) {
setListAdapter(rssadaptor);
progress.dismiss();
super.onPostExecute(result);
}
#Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
}
private class RSSListAdaptor extends ArrayAdapter<RSSItem>{
private List<RSSItem> objects = null;
public RSSListAdaptor(Context context, int textviewid, List<RSSItem> objects) {
super(context, textviewid, objects);
this.objects = objects;
}
#Override
public int getCount() {
return ((null != objects) ? objects.size() : 0);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public RSSItem getItem(int position) {
return ((null != objects) ? objects.get(position) : null);
}
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
if(null == view)
{
LayoutInflater vi = (LayoutInflater)RSSListActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = vi.inflate(R.layout.rssitemview, null);
}
RSSItem data = objects.get(position);
if(null != data)
{
TextView title = (TextView)view.findViewById(R.id.txtTitle);
TextView date = (TextView)view.findViewById(R.id.txtDate);
TextView description = (TextView)view.findViewById(R.id.txtDescription);
title.setText(data.title);
date.setText("on " + data.date);
String prova = android.text.Html.fromHtml(data.description).toString();
//description.setText(data.description);
description.setText(prova);
}
return view;
}
}
public boolean onCreateOptionsMenu(Menu menu)
{
menu.add(1,1,0,"About");
return true;
}
public boolean onOptionsItemSelected(MenuItem item)
{
switch(item.getItemId())
{
case 1:
AlertDialog.Builder conferma_canc = new AlertDialog.Builder(this);
conferma_canc.setTitle("About");
conferma_canc.setMessage("Copyright © 2012 Qubiz. All rights reserved. Android version designed and developed by Csosz Gergo Levente, Qubiz Romania.");
conferma_canc.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
AlertDialog alert = conferma_canc.create();
alert.show();
return true;
}
return false;
}
And here it is my RSS parser which also works as it should:
public class RSSParser extends DefaultHandler {
private final static String TAG_ITEM = "item";
private final static String[] xmltags = { "title", "link", "pubDate", "description" };
private RSSItem currentitem = null;
private ArrayList<RSSItem> itemarray = null;
private int currentindex = -1;
private boolean isParsing = false;
private StringBuilder builder = new StringBuilder();
public RSSParser(ArrayList<RSSItem> itemarray) {
super();
this.itemarray = itemarray;
}
#Override
public void characters(char[] ch, int start, int length) throws SAXException {
super.characters(ch, start, length);
if(isParsing && -1 != currentindex && null != builder)
{
builder.append(ch,start,length);
}
}
#Override
public void startElement(String uri, String localName, String qName,Attributes attributes) throws SAXException {
super.startElement(uri, localName, qName, attributes);
if(localName.equalsIgnoreCase(TAG_ITEM))
{
currentitem = new RSSItem();
currentindex = -1;
isParsing = true;
itemarray.add(currentitem);
}
else
{
currentindex = itemIndexFromString(localName);
builder = null;
if(-1 != currentindex)
builder = new StringBuilder();
}
}
#Override
public void endElement(String uri, String localName, String qName) throws SAXException {
super.endElement(uri, localName, qName);
if(localName.equalsIgnoreCase(TAG_ITEM))
{
isParsing = false;
}
else if(currentindex != -1)
{
if(isParsing)
{
switch(currentindex)
{
case 0: currentitem.title = builder.toString(); break;
case 1: currentitem.link = builder.toString(); break;
case 2: currentitem.date = builder.toString(); break;
case 3: currentitem.description= builder.toString(); break;
}
}
}
}
private int itemIndexFromString(String tagname){
int itemindex = -1;
for(int index= 0; index<xmltags.length; ++index)
{
if(tagname.equalsIgnoreCase(xmltags[index]))
{
itemindex = index;
break;
}
}
return itemindex;
}
}
My ExampleAppWidgetProvider.java where is a sample clock widget code which I want to replace to show my rss feed.
public class ExampleAppWidgetProvider extends AppWidgetProvider {
static DateFormat df = new SimpleDateFormat("hh:mm:ss");
private static final String LOG_TAG = "ExampleWidget";
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
final int N = appWidgetIds.length;
Log.i("ExampleWidget", "Updating widgets " + Arrays.asList(appWidgetIds));
for (int i = 0; i < N; i++) {
int appWidgetId = appWidgetIds[i];
Intent intent = new Intent(context, ExampleAppWidgetProvider.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget1);
views.setOnClickPendingIntent(R.id.button, pendingIntent);
views.setTextViewText(R.id.widget1label, df.format(new Date()));
appWidgetManager.updateAppWidget(appWidgetId, views);
}
}
private PendingIntent createClockTickIntent(Context context) {
Intent intent = new Intent(CLOCK_WIDGET_UPDATE);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
return pendingIntent;
}
#Override
public void onEnabled(Context context) {
super.onEnabled(context);
Log.d(LOG_TAG, "Widget Provider enabled. Starting timer to update widget every second");
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.SECOND, 1);
alarmManager.setRepeating(AlarmManager.RTC, calendar.getTimeInMillis(),1000, createClockTickIntent(context));
}
#Override
public void onDisabled(Context context) {
super.onDisabled(context);
Log.d(LOG_TAG, "Widget Provider disabled. Turning off timer");
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
alarmManager.cancel(createClockTickIntent(context));
}
public static String CLOCK_WIDGET_UPDATE = "com.eightbitcloud.example.widget.8BITCLOCK_WIDGET_UPDATE";
#Override
public void onReceive(Context context, Intent intent) {
super.onReceive(context, intent);
Log.d(LOG_TAG, "Received intent " + intent);
if (CLOCK_WIDGET_UPDATE.equals(intent.getAction())) {
Log.d(LOG_TAG, "Clock update");
ComponentName thisAppWidget = new ComponentName(context.getPackageName(), getClass().getName());
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
int ids[] = appWidgetManager.getAppWidgetIds(thisAppWidget);
for (int appWidgetID : ids) {updateAppWidget(context, appWidgetManager, appWidgetID);
}
}
}
public static void updateAppWidget(Context context,AppWidgetManager appWidgetManager, int appWidgetId) {
String currentTime = df.format(new Date());
RemoteViews updateViews = new RemoteViews(context.getPackageName(),R.layout.widget1);
updateViews.setTextViewText(R.id.widget1label, currentTime);
appWidgetManager.updateAppWidget(appWidgetId, updateViews);
}
}
Could any1 provide me a solution?
My aim is to: replace the widget's clock java code with my rss feed reader.
So I want to show the last rss item in the widget which is parsed by the rss parser. How can I do that?
Please provide code too, not only a few ideas, I am kinda new to android development.
Thank you for help in advance!

(Assuming you got RSS retrieval and parsing correctly)
You just have to change some text in widget:
AppWidgetManager manager = AppWidgetManager.getInstance(context);
RemoteViews views = new RemoteViews(context.getPackageName(), R.name_of_your_widget_layout);
// set text of some view
views.setTextViewText(R.id.widget_amount_cameras, amountCameras);
// and of another view
views.setTextViewText(R.id.widget_location, locationCity);
// ... and yet another view
views.setTextViewText(R.id.locationStatus, locationStatus);
// get IDs of widgets , there could be more than one
final int[] appWidgetIds = manager.getAppWidgetIds(new ComponentName(YOurWidgetProviderClass.class.getPackage().getName(), YOurWidgetProviderClass.class.getName()));
// update all hte instances
manager.updateAppWidget(appWidgetIds, views);
You can change only some attributes of your widgets ( due to security constraints ) - See Javadoc of RemoteViews for further explanations