Develop Reference

Back button restores modified text Views

I will simplify my code to address the problem specifically:
I have an activity A with some TextViews, which text is set to certain key values stored in SharedPreferences, in the activity's OnCreate method. Each textview has a button besides it. When a button is clicked it opens a new activity B which displays an adapter with different text strings. When the user clicks one, the new string is stored in preferences and the user is directed back to Activity A through an intent, and so OnCreate method is called and the textview is updated with the selected text. This works perfectly.
However, my problem is:
When a user does this and updates the textview, if they press Back button once, it will take them to Activity B, but if pressed twice that will take them to Activity A before updating the TextView and thus displaying the old textview, despite having stored in SharedPreferences the updated value. How can this be fixed?
A more simplified version of my problem is, I have a TextView in my layout, and a button which if pressed, deletes it and refreshes the Activity. User presses the delete button, text view disappears, but then presses back button and TextView is restored. That's what I dont want.
I have researched all the back button methodologies and savedInstanceState documentation but I still havent found something that works. I also tried adding an UpNavigation button in my action bar but it does the same effect than the back button.
ACTIVITY A (All these bits of code are called in OnCreate)
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
String sound1name = prefs.getString("sound1", "1");
TextView sound1TV = findViewById(R.id.sound1);
sound1TV.setText(sound1Name);
ImageView sound1btn = findViewById(R.id.sound1_btn);
sound1btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent1 = new Intent(getApplicationContext(), SoundSelector.class);
startActivity(intent1);
}
});
ACTIVITY B (calls adapter)
AudioFileAdapter aFilesAdapter = new AudioFileAdapter(SoundSelector.this, audioFileList, soundID);
ListView listView = findViewById(R.id.sounds_list);
listView.setAdapter(aFilesAdapter);
ADAPTER IN ACTIVITY B (OnClickListener when text is selected)
SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(contextL);
SharedPreferences.Editor editor = settings.edit();
editor.putString("sound1", sound1string);
editor.apply();
Intent intent1 = new Intent(getContext(), SoundEditor.class);
con.startActivity(intent1);
Im not sure if it is the Activity Lifecycle I have to modify, or intents, or something else but if someone could point me in the right direction I would really appreciate it, if you need any more information or code I'll post as soon as possible.

For storing and retrieving shared preferences try the following:
Storing
SharedPreferences preferences = getSharedPreferences("com.appname", Context.MODE_WORLD_WRITEABLE);
SharedPreferences.Editor editor = preferences.edit();
editor.putString("sound1", "YOUR STRING HERE");
editor.apply();
Retrieving
SharedPreferences prfs = getSharedPreferences("com.appname", Context.MODE_PRIVATE);
String soundString = prfs.getString("sound1", "");
Your intent looks fine, are you sure you're passing Activity A's name?
For your second scenario, you could store if the text view was deleted in the shared preference, so when the back button is pressed, it won't display it again in the previous activity.
Something like this
if (isDeleted.equals("Yes")) {
textView.setVisibility(View.INVISIBLE);
}

The way Activity B is navigating back to Activity A by restarting the activity in the front and not by onBackPressed() navigation. Besides if the navigation is an important component to update the string value then the recommended method would be to use startActivityForResult() and update the preference and the TextView upon onActivityResult() of Activity A
class ActivityA extends AppCompatActivity {
private static final int activityRequest = 0x22;
public static final String keyPref = "keyToSharedPrefData";
private TextView mTextView;
private boolean isHidden = false;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.a_activity);
mTextView = findViewById(R.id.someTextView);
final String textForTextView = SharedPrefUtils.getString(keyPref);
mTextView.setText(textForTextView);
final Button button = findViewById(R.id.someButton);
if (button != null) {
button.setOnClickListener((view) -> {
final Intent intent = new Intent(ActivityA.this, AcitivtyB.class);
startActivityForResult(intent, activityRequest);
});
}
final deleteButton = findViewById(R.id.delete_button);
if (deleteButton != null) {
deleteButton.setOnClickListener((view) -> {
mTextView.setText("");
isHidden = true;
});
}
}
#Override
public void onActivityResult(int requestCode, int resultCode, Intent data){
if (requestCode == activityRequest && resultCode == ActivityB.resultSuccess && data != null) {
if (data.containsKey(ActivityB.resultKey)) {
SharedPrefUtils.saveString(keyPref,
data.getString(ActivityB.resultKey, SharedPrefUtils.getString(keyPref));
if (mTextView != null) {
mTextView.setText(SharedPrefUtils.getString(keyPref));
}
}
}
if (isHidden) {
mTextView.setVisibility(View.GONE);
}
}
}
in ActivityB you can
class ActivityB extends AppCompatActivity {
public static final int resultSuccess = 0x11
public static final int resultFailure = 0x33
public static final String resultKey = "keyForResult"
private void onListItemClick(final String soundString) {
// optional you can also do this
SharedPrefUtils.saveString(ActivityA.keyPref, soundString);
// better to do this
final Intent returnIntent = getIntent() != null ? getIntent() : new Intent();
returnIntent.putExtra(resultKey, soundString);
if (getCallingActivity() != null) {
setResult(returnIntent, resultSuccess);
}
onBackPressed();
}
}

Android: send data from adapter class to Activity

I want to add pictures to my favorite activity when a user tap on a picture. So far I'm able to get the data and display it but for some reason whenever I tap on an image it displays the favorited image, however, when I recheck the favorite activity by clicking on it, it shows empty.
Here's the little flow chart.
imageOnTap is implemented on RecyclerAdapter class. I have my Favorite activity and MainActivity.Any help would be appreciated. Thanks
Here's my MyRecyclerAdapter class
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
holder.nameTxt.setText(albums.get(position).getName());
holder.img.setImageResource(albums.get(position).getImage());
//listener
holder.setItemClickListener(new ItemClickListener() {
#Override
public void onItemClick(View v, int pos) {
Toast.makeText(c,albums.get(pos).getName() + " ,added to favorite ",Toast.LENGTH_SHORT).show();
SharedPreferences settings = c.getSharedPreferences(PREFS_NAME,0);
SharedPreferences.Editor editor = settings.edit();
editor.putInt("favorite",albums.get(pos).getImage());
editor.commit();
Toast.makeText(c,albums.get(pos).getName() + " ,added to favorite ",Toast.LENGTH_SHORT).show();
Intent intent = new Intent(c, favorite.class);
// intent.putExtra(Intent.EXTRA_TEXT, albums.get(pos).getImage());
c.startActivity(intent);
}
});
}
Here's my favorite activity
public class favorite extends AppCompatActivity {
int favImage;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_favorite);
ImageView displayImage = (ImageView) findViewById(R.id.movieImage);
SharedPreferences settings = getSharedPreferences(PREFS_NAME,0);
displayImage.setImageResource(settings.getInt("Favorite", 0));
// Intent intent = getIntent();
// if (intent.hasExtra(Intent.EXTRA_TEXT)) {
// favImage = intent.getIntExtra(Intent.EXTRA_TEXT,image);
// displayImage.setImageResource(favImage);
//
// }
}
}
Here's my MainActivity
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_favorite) {
Intent intent = new Intent(this,favorite.class);
startActivity(intent);
}

If you are checking favourite activity from nav menu then it will not display anything afterall you are not passing any intent extras in it. Is it being display when you click the image? Are you getting intent params null here?

Use those preferences:
SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(ctx.getApplicationContext());
In your case it might be different activities observe different areas of settings.
THAT IS:
use:
SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(ctx.getApplicationContext());
SharedPreferences.Editor editor = settings.edit();
editor.putInt("favorite",albums.get(pos).getImage());
editor.commit();
instead of:
SharedPreferences settings = c.getSharedPreferences(PREFS_NAME,0);
SharedPreferences.Editor editor = settings.edit();
editor.putInt("favorite",albums.get(pos).getImage());
editor.commit();
AND
this:
SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(ctx.getApplicationContext());
displayImage.setImageResource(settings.getInt("Favorite", 0));
instead of:
SharedPreferences settings = getSharedPreferences(PREFS_NAME,0);
displayImage.setImageResource(settings.getInt("Favorite", 0));

How to show dialog box once in a three days in application

Here is my code it is working please tell me code button for "no thanks" if user tap on this button then dialog box never show at all
public class MainActivity extends Activity {
Button btnRegId;
EditText etRegId;
String regID;
GoogleCloudMessaging gcm;
String regid,url;
//String PROJECT_NUMBER = "90787073097";
String PROJECT_NUMBER = "440085976573";
String android_id,version,ver;
ImageView mega4,todayTips,latstnews,sportquiz,tipister;
TextView txtname;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// etRegId = (EditText) findViewById(R.id.edtvID);
//********************For Rating APP **********************
SharedPreferences sharedPrefs = MainActivity.this.getSharedPreferences("RATER", 0);
SharedPreferences.Editor prefsEditor = sharedPrefs.edit();
long time = sharedPrefs.getLong("displayedTime", 0);
if (time < System.currentTimeMillis() - 259200000) {
displayDialog();
prefsEditor.putLong("displayedTime", System.currentTimeMillis()).commit();
}
}
//dialog box Function for rating app.
private void displayDialog() {
// TODO Auto-generated method stub
DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
switch (which){
case DialogInterface.BUTTON_POSITIVE:
//Yes button clicked
Intent in = new Intent(android.content.Intent.ACTION_VIEW);
in.setData(Uri.parse(url));
startActivity(in);
break;
case DialogInterface.BUTTON_NEGATIVE:
//No button clicked
break;
}
}
};
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Rate This App");
builder.setMessage("You really seem to like this app, "
+"since you have already used it %totalLaunchCount% times! "
+"It would be great if you took a moment to rate it.")
.setPositiveButton("Rate Now", dialogClickListener)
.setNegativeButton("Latter", dialogClickListener)
.setNeutralButton("No,thanks", dialogClickListener).show();
}
//End dialog box Function for rating app.
}
Here is my code actually i want to implement app rating dialog box in application that should display once in three day

You have to initialize your SharedPreferences and Editor Object like this:
SharedPreferences prefs = mContext.getSharedPreferences("RATER", 0);
SharedPreferences.Editor editor = prefs.edit();
UPDATE
Just save a boolean when user cliks on no thanks and check it before showing the dialog. If it true then it will not show the dialog box.
//Saving a boolean on no thanks button click
SharedPreferences prefs = mContext.getSharedPreferences("RATER", 0);
SharedPreferences.Editor editor = prefs.edit();
editor.putBoolean("NO THANKS", true));
editor.apply();
Access it in your dialog showing method.
SharedPreferences prefs = mContext.getSharedPreferences("RATER", 0);
if (prefs.getBoolean("NO THANKS", false)) {
return;
}else {
SharedPreferences.Editor editor = prefs.edit();
//YOUR CODE TO SHOW DIALOG
editor.apply();
}
FULL CODE
public class MainActivity extends Activity {
Button btnRegId;
EditText etRegId;
String regID;
GoogleCloudMessaging gcm;
String regid, url;
//String PROJECT_NUMBER = "90787073097";
String PROJECT_NUMBER = "440085976573";
String android_id, version, ver;
ImageView mega4, todayTips, latstnews, sportquiz, tipister;
TextView txtname;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// etRegId = (EditText) findViewById(R.id.edtvID);
//********************For Rating APP **********************
SharedPreferences sharedPrefs = MainActivity.this.getSharedPreferences("RATER", 0);
if (sharedPrefs.getBoolean("NO THANKS", false)) {
return;
} else {
SharedPreferences.Editor prefsEditor = sharedPrefs.edit();
//YOUR CODE TO SHOW DIALOG
long time = sharedPrefs.getLong("displayedTime", 0);
if (time < System.currentTimeMillis() - 259200000) {
displayDialog();
prefsEditor.putLong("displayedTime", System.currentTimeMillis()).commit();
}
prefsEditor.apply();
}
}
//dialog box Function for rating app.
private void displayDialog() {
// TODO Auto-generated method stub
DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
switch (which) {
case DialogInterface.BUTTON_POSITIVE:
//Yes button clicked
Intent in = new Intent(android.content.Intent.ACTION_VIEW);
in.setData(Uri.parse(url));
startActivity(in);
break;
case DialogInterface.BUTTON_NEGATIVE:
//No button clicked
//Saving a boolean on no thanks button click
SharedPreferences prefs = MainActivity.this.getSharedPreferences("RATER", 0);
SharedPreferences.Editor editor = prefs.edit();
editor.putBoolean("NO THANKS", true);
editor.apply();
break;
}
}
};
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Rate This App");
builder.setMessage("You really seem to like this app, "
+ "since you have already used it %totalLaunchCount% times! "
+ "It would be great if you took a moment to rate it.")
.setPositiveButton("Rate Now", dialogClickListener)
.setNegativeButton("Latter", dialogClickListener)
.setNeutralButton("No,thanks", dialogClickListener).show();
}
//End dialog box Function for rating app.
}

here is my code as a function for 10 days.
I made the initial value current time - 11 days to make sure it will run first time app launches
public void dialogEvery10Days() {
Long duration = getSharedPreferences("PREFERENCE", MODE_PRIVATE).getLong("duration", System.currentTimeMillis()-TimeUnit.DAYS.toMillis(11));
if (System.currentTimeMillis()-duration > TimeUnit.DAYS.toMillis(10)) {
// inflateDialog is a function containing the functionality of popping up the dialog
Dialog dialog = inflateDialog(R.layout.dialog_layout);
getSharedPreferences("PREFERENCE", MODE_PRIVATE)
.edit()
.putLong("duration", System.currentTimeMillis())
.apply();
}
}

Shared preferences? (Extremely simple issue!?)

I am just trying to store the users input from an editText in a Shared Preference, but it is not working:
editText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
#Override
public boolean onEditorAction(TextView v, int keycode, KeyEvent event) {
Log.v(TAG, keyword.getString("keyword", "mDefault")); //IT LOGS OUT THE DEFAULT STRING EVEN **AFTER** STORING THE PREFERENCES BEFORE
if (keycode == EditorInfo.IME_ACTION_SEND) {
editText.setText(editText.getText().toString());
keywordEditor.putString("keyword", editText.getText().toString());
keywordEditor.commit();
Log.v(TAG, keyword.getString("keyword", "default")); //CORRECT! THIS LINE WORKS
}
}
return true;
});
When I first edit the text, I will first get a log of "mDefault" which is normal, since nothing is stored in the shared preference.
Then, I store something in the shared preference, and to make sure it stored, I log and I get a log of what I typed. Which means the shared preference data WAS stored.
Heres the problem: After I have stored something in the shared preference, I go to a different activity, and I come back, and all the data stored in the shared preference is GONE!
The very first log still says mDefault after navigating through activities.
What could the problem be?
EDIT:
Here is my instantiation:
onCreate:
keyword = PreferenceManager.getDefaultSharedPreferences(this); //Making a shared preferences
keywordEditor = keyword.edit();

Maybe you don't save on setOnEditorActionListener. Save when you go to a different activity. Because when it goes to different activity the setOnEditorActionListener editText.getText().toString() it returns null.

STORING PREFERENCES:
SharedPreferences pref = getSharedPreferences("MyPrefs",Context.MODE_PRIVATE);
// We need an editor object to make changes
SharedPreferences.Editor edit = pref.edit();
// Set/Store data
edit.putString("username", "Rishabh");
edit.putString("password", "rishabh123");
// Commit the changes
edit.commit();
RETRIEVING PREFERENCES:
SharedPreferences pref = getSharedPreferences("MyPrefs", Context.MODE_PRIVATE);
String username = pref.getString("username", "");
String password= pref.getString("password", "");
Log.d(TAG, username);
Log.d(TAG, password);

Adding this as an example in case you missed a key components. This is currently working for me:
public class Main2Activity extends ActionBarActivity {
private SharedPreferences keyword;
private SharedPreferences.Editor keywordEditor;
private String TAG = "TAG";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
keyword = PreferenceManager.getDefaultSharedPreferences(this); //Making a shared preferences
keywordEditor = keyword.edit();
final EditText editText = (EditText) findViewById(R.id.et_text);
findViewById(R.id.btn_launch).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(Main2Activity.this, Main22Activity.class);
startActivity(intent);
}
});
editText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
#Override
public boolean onEditorAction(TextView v, int keycode, KeyEvent event) {
Log.v(TAG, "Initial: " + keyword.getString("keyword", "mDefault")); //IT LOGS OUT THE DEFAULT STRING EVEN **AFTER** STORING THE PREFERENCES BEFORE
if (keycode == EditorInfo.IME_ACTION_SEND) {
editText.setText(editText.getText().toString());
keywordEditor.putString("keyword", editText.getText().toString());
keywordEditor.commit();
Log.v(TAG, "Saving in prefs: " + keyword.getString("keyword", "default")); //CORRECT! THIS LINE WORKS
}
return true;
}
});
}
}
From a fresh install:
I typed in "test" and hit the send button on keyboard therefore invoked the onEditorAction
Then clicked on launch new activity -> hit back button and typed in "test2" and hit send button.
The following is the log out put:
02-29 23:26:42.068 18105-18105/com.example.naveed.myapplication V/TAG: Initial: mDefault
02-29 23:26:42.136 18105-18105/com.example.naveed.myapplication V/TAG: Saving in prefs: test
02-29 23:26:53.281 18105-18105/com.example.naveed.myapplication V/TAG: Initial: test
02-29 23:26:53.338 18105-18105/com.example.naveed.myapplication V/TAG: Saving in prefs: test2
As you can see initially it was "mDefault" then "test" was saved. I launched a new activity and came back. Next time the initial was "test" since it was saved last time and "test2" was the new value saved.

Create SharedPreferences class
public class SharedPreferenceClass
{
// Shared Preferences
SharedPreferences pref;
// Editor for Shared preferences
SharedPreferences.Editor editor;
// Context
Context _context;
// Shared pref mode
int PRIVATE_MODE = 0;
// Sharedpref file name
private static final String PREF_NAME = "INTELLIJ_AMIYO";
public static final String KEY_SET_VALUE= "KEY_SET_VALUE";
public SharedPreferenceClass(Context context){
this._context = context;
pref = _context.getSharedPreferences(PREF_NAME, 0);
editor = pref.edit();
}
public void setUserDATA(String data)
{
editor.remove(KEY_SET_VALUE);
editor.putString(KEY_SET_VALUE, data);
editor.commit();
}
public String getUserDATA()
{
String getData= pref.getString(KEY_SET_VALUE, null);
return getData;
}
}
Now call this in your Activity section globally
SharedPreferenceClass sharedPrefClassObj;
& call onCreate(Bundle savedInstanceState) section
sharedPrefClassObj = new SharedPreferenceClass(getApplicationContext());
Now add this
editText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
#Override
public boolean onEditorAction(TextView v, int keycode, KeyEvent event) {
if (keycode == EditorInfo.IME_ACTION_SEND) {
editText.setText(editText.getText().toString());
sharedPrefClassObj.setUserDATA(editText.getText().toString()); // Set data
// Get data sharedPrefClassObj.getUserDATA();
}
}
return true;
});

Very important: you need a Preference name (for example: "MY_PREFS_NAME") to set and retrieve the values:
SharedPreferences.Editor keywordEditor = context.getSharedPreferences("MY_PREFS_NAME", MODE_PRIVATE).edit();
Use the same constant Preference name and it will give you the same preferences in any point of your app.

Android - Change class variable before onCreate

I am new to Android development. I am trying to call a method of one of my classes when a button on my main activity is pressed.
On my Main Activity I have this button:
public void buttonTest(){
Button b = (Button) findViewById(R.id.test);
b.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
String s = "changeText:myText";
Intent in = new Intent(PlusActivity.this, Test.class);
in.putExtra("method",s);
startActivity(in);
}
});
}
And here is is the class (without imports) which that intent above is calling to.
public class Test extends Activity {
static String text = "test";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test);
TextView mTextView = (TextView) findViewById(R.id.textView);
mTextView.setText(text);
}
public void changeText(String s){
this.text = s;
}
#Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
String[] array = intent.getStringExtra("method").split(":");
if(array[0].equals("changeText")){
changeText(array[1]);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.test, menu);
return true;
}
}
Basically I want to know if it is possible to change the value of that String text, before onCreate(). Basically each button will have a correspondent text, and I want to be able to modify that text based on which button.
If it is, what should I do/change?
Thanks in advance.

The right way to do it is to send the string you want it to be as an extra in the intent, and to read the extra from the intent and assign it to that variable in the onCreate function.

Use SharedPreference. Save in OnCLick of first class and retrieve in OnCreate of second class.
Initialization
SharedPreferences pref = getApplicationContext().getSharedPreferences("MyPref", 0); // 0 - for private mode
Editor editor = pref.edit();
Storing Data
editor.putBoolean("key_name", true); // Storing boolean - true/false
editor.putString("key_name", "string value"); // Storing string
editor.putInt("key_name", "int value"); // Storing integer
editor.putFloat("key_name", "float value"); // Storing float
editor.putLong("key_name", "long value"); // Storing long
editor.commit(); // commit changes
Retrieving Data
// returns stored preference value
// If value is not present return second param value - In this case null
pref.getString("key_name", null); // getting String
pref.getInt("key_name", null); // getting Integer
pref.getFloat("key_name", null); // getting Float
pref.getLong("key_name", null); // getting Long
pref.getBoolean("key_name", null); // getting boolean
Deleting Data
editor.remove("name"); // will delete key name
editor.remove("email"); // will delete key email
editor.commit(); // commit changes
Clearing Storage
editor.clear();
editor.commit(); // commit changes

String text;
if (savedInstanceState == null) {
extras = getIntent().getExtras();
if(extras == null) {
text= null;
} else {
text= extras.getString("your default string message");
}
} else {
String s = "your default string message";
text= (String) savedInstanceState.getSerializable(s);
}