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Update an object in RecyclerView

I have a problem with updating an item in RecycleView.
When i try to edit a dream object and save it then it gets updated in database but not in the list of dream and I don't know why.
This method creates and updates a dream object.
#OnClick({R.id.addTagDream, R.id.saveDreamButton})
public void onViewClicked(View view) {
switch (view.getId()) {
case R.id.addTagDream:
Intent intent = new Intent(AddEditDreamActivity.this, SelectDreamActivity.class);
startActivityForResult(intent, SELECTED_DREAM);
break;
case R.id.saveDreamButton:
boolean hasError = false;
...
if (!hasError) {
// check if exit dream about id
try {
myDreamList = myDreamDao.queryForEq(MyDream.Columns.MY_DREAM_ID, dreamId);
} catch (SQLException e) {
e.printStackTrace();
}
chcek if dream exist
if (myDreamList != null && !myDreamList.isEmpty()) {
// update dream
UpdateBuilder<MyDream, ?> updateMyDream = myDreamDao.updateBuilder();
// condition update dream about dream id
try {
updateMyDream.where().eq(MyDream.Columns.MY_DREAM_ID, dreamId);
} catch (SQLException e) {
e.printStackTrace();
}
// update column title dream
try {
updateMyDream.updateColumnValue(MyDream.Columns.TITLE_DREAM, dreamTitle);
} catch (SQLException e) {
e.printStackTrace();
}
// update dream description
try {
updateMyDream.updateColumnValue(MyDream.Columns.DESCRIPTION, dreamDescription);
} catch (SQLException e) {
e.printStackTrace();
}
// update dream symbol
try {
updateMyDream.updateColumnValue(MyDream.Columns.SYMBOL_DREAM, selectSymbolDream);
} catch (SQLException e) {
e.printStackTrace();
}
try {
updateMyDream.update();
} catch (SQLException e) {
e.printStackTrace();
}
finish();
}
}
break;
}
}

Use adapter.notifyDataSetChanged() or notifyItemInserted() whenever you are adding values in list
Hope this will help you

save server response in sqlite database(offline)

i call below php webservice and get xml response and parse resonse and set it to hashmap.now i want save server response in offline mode .can i save data in offline mode.how plz give me answer.
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (pDialog.isShowing())
pDialog.dismiss();
try {
if (response.length() > 0) {
int code = Integer.parseInt(XMLManualParser.getTagValue(Constant.TAG_CODE, response));
if (code == 1) {
spinner.clear();
ArrayList<String> eventlist = XMLManualParser.getMultipleTagList(Constant.TAG_LIST, response);
for (int i = 0; i < eventlist.size(); ++i) {
String responseContent = eventlist.get(i);
HashMap<String, String> hashMap = new HashMap<String, String>();
String title = XMLManualParser.getTagValue(Constant.title, responseContent);
hashMap.put("title", title);
hashMap.put("id", XMLManualParser.getTagValue(Constant.id, responseContent));
hashMap.put("url", XMLManualParser.getTagValue(Constant.url, responseContent));
hashMap.put("balanceurl", XMLManualParser.getTagValue(Constant.balanceurl, responseContent));
spinner.add(hashMap);
}
} else {
Toast.makeText(SettingsEditActivity.this, "no data found", Toast.LENGTH_SHORT).show();
}
CustomSpinnerAdapter customSpinnerAdapter = new CustomSpinnerAdapter(SettingsEditActivity.this, spinner);
settingsBinding.splist.setAdapter(customSpinnerAdapter);
settingsBinding.splist.setOnItemSelectedListener(new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
item = parent.getItemAtPosition(position).toString();
// Toast.makeText(parent.getContext(), "Android Custom Spinner Example Output..." + item, Toast.LENGTH_LONG).show();
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

You can save your response into a file and get in offline
public static void saveDataSingleItemDetails(Context context,String file, MainListModel data) {
FileOutputStream fileOutputStream = null;
try {
fileOutputStream = context.openFileOutput(file, MODE_PRIVATE);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (NullPointerException e) {
return;
}
ObjectOutputStream objectOutputStream = null;
try {
objectOutputStream = new ObjectOutputStream(fileOutputStream);
} catch (IOException | NullPointerException e) {
e.printStackTrace();
}
try {
if (objectOutputStream != null) {
objectOutputStream.writeObject(data);
}
} catch (IOException e) {
e.printStackTrace();
}
try {
if (objectOutputStream != null) {
objectOutputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
public static MainListModel getSinglItemDetails(Context context,String file) {
MainListModel items = null;
FileInputStream fileInputStream = null;
try {
fileInputStream = context.openFileInput(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
return items;
} catch (NullPointerException e) {
return items;
}
ObjectInputStream objectInputStream = null;
try {
objectInputStream = new ObjectInputStream(fileInputStream);
} catch (IOException | NullPointerException e) {
e.printStackTrace();
return items;
}
try {
items = (MainListModel) objectInputStream.readObject();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
try {
objectInputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
return items;
}

Label the internal memory file At Run Time

I have an application that
takes data from the user and
creates a file in the internal memory based on the name entered by the user
and saves the user data.
But when the file is saved by that name, the fileInputStream does not respond to that name.
what should I do ?
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_load_food);
bundle = getIntent().getExtras();
Toolbar toolbar=(Toolbar)findViewById(R.id.food_lood_toolbar);
setSupportActionBar(toolbar);
file=bundle.getString("diname");
getSupportActionBar().setTitle(file);
String q=”123”;
if (bundle.getString("activity").equals(q)) {
String e1=editText1.getText().toString() +"/";
fileOutputStream=openFileOutput(file,Context.MODE_PRIVATE);
fileOutputStream.write(e1.getBytes());
}
String t="321";
if (bundle.getString("activity").equals(t)){
try {
fileInputStream= openFileInput(file);
int x;
StringBuffer y = new StringBuffer();
while((x=fileInputStream.read())!=-1){
y.append((char)x);
}
String c=y.toString();
txt=c.split("/");
editText1.setText(txt[0]);
} catch (FileNotFoundException e) {
Toast.makeText(getBaseContext(),"file not found",Toast.LENGTH_LONG).show();
e.printStackTrace();
} catch (IOException e) {
Toast.makeText(getBaseContext(),"io",Toast.LENGTH_LONG).show();
e.printStackTrace();
}
finally {
try {
fileInputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

IO exception is not handle

I have an issue in my Android app saying "Unhandled IOException: java.io.exception" when I'm trying to getBitmap from URI. below is the code.
I do not want to catch all exception using a catch (exception e) as it's too wide.
private void getBitmapFromURI(Uri uri) {
try {
mSnapShot = MediaStore.Images.Media.getBitmap(this.getContentResolver(), uri);
int PreviewSizeWidth = CameraApplication.Instance().getResources().getInteger(R.integer.FilterPreviewWidth);
int PreviewSizeHeight = CameraApplication.Instance().getResources().getInteger(R.integer.FilterPreviewHeight);
mPreviewBitmap = Bitmap.createScaledBitmap(mSnapShot, PreviewSizeWidth, PreviewSizeHeight, false);
FiltersPreview();
}
catch (FileNotFoundException e) {
e.printStackTrace();
Log.e(TAG, "File not found");
finish();
}
}
any idea how to catch exception in case getbitmap not working ?
thx

Try...
try {
mSnapShot = MediaStore.Images.Media.getBitmap(this.getContentResolver(), uri);
int PreviewSizeWidth = CameraApplication.Instance().getResources().getInteger(R.integer.FilterPreviewWidth);
int PreviewSizeHeight = CameraApplication.Instance().getResources().getInteger(R.integer.FilterPreviewHeight);
mPreviewBitmap = Bitmap.createScaledBitmap(mSnapShot, PreviewSizeWidth, PreviewSizeHeight, false);
FiltersPreview();
}
catch (FileNotFoundException e) {
e.printStackTrace();
Log.e(TAG, "File not found");
finish();
}catch(IOException e){
//do something
}

Use the multi catch and make sure to log your exception in logcat. Something like this.
catch (FileNotFoundException | IOException e) {
Log.e(TAG, e.getMessage(), e);
finish();
}

You should also catch the IOException
private void getBitmapFromURI(Uri uri) {
try {
mSnapShot = MediaStore.Images.Media.getBitmap(this.getContentResolver(), uri);
int PreviewSizeWidth = CameraApplication.Instance().getResources().getInteger(R.integer.FilterPreviewWidth);
int PreviewSizeHeight = CameraApplication.Instance().getResources().getInteger(R.integer.FilterPreviewHeight);
mPreviewBitmap = Bitmap.createScaledBitmap(mSnapShot, PreviewSizeWidth, PreviewSizeHeight, false);
FiltersPreview();
}
catch (FileNotFoundException e) {
e.printStackTrace();
Log.e(TAG, "File not found");
finish();
}
catch (IOException e) {
e.printStackTrace();
Log.e(TAG, "IO error");
finish();
}
}
or you have to change you method signature to
private void getBitmapFromURI(Uri uri) throws IOException
and handle this on an other place.

Showing a liste of alias recorded in AndroidKeyStore

I try this code to show the list of alias recorded in AndroidKeyStore .But nothing is displayed in the ListView. Somebody has an idea about what's wrong in the code !
ArrayList<String> alia= new ArrayList<String>();
try{
KeyStore ks = KeyStore.getInstance("AndroidKeyStore");
ks.load(null);
Enumeration<String> aliases = ks.aliases();
while(aliases.hasMoreElements()) {
String alias= aliases.toString();
alias = (String)aliases.nextElement();
alia.add(alias);
}
}
catch (java.security.cert.CertificateException e) {
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (KeyStoreException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
ArrayAdapter<String> adapter=new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_expandable_list_item_1,alia);
listView.setAdapter(adapter);