ViewPager PagerAdapter not updating the View

There are several ways to achieve this. The first option is easier, but bit more inefficient. Override getItemPosition in your PagerAdapter like this:

public int getItemPosition(Object object) {
    return POSITION_NONE;
}

public int getItemPosition(Object object) {

return POSITION_NONE;

}

This way, when you call notifyDataSetChanged(), the view pager will remove all views and reload them all. As so the reload effect is obtained. The second option, suggested by Alvaro Luis Bustamante (previously alvarolb), is to setTag()method in instantiateItem() when […]

shubham sharma July 20, 2018 Read More

shared preference

String sPNotes = getPreferences(Context.MODE_PRIVATE).getString("NOTES", "EMPTY");

1	String sPNotes = getPreferences(Context.MODE_PRIVATE).getString("NOTES", "EMPTY");

 // 1. Called before Android kills an application, but doesn't protect you
    // if the user kills the app or restarts the device
    @Override
    protected void onSaveInstanceState(Bundle outState) {
 
        // Save the value in the EditText using the key NOTES
        outState.putString("NOTES","Your string");
 
        super.onSaveInstanceState(outState);
    }

// 1. Called before Android kills an application, but doesn't protect you

// if the user kills the app or restarts the device

@Override

protected void onSaveInstanceState(Bundle outState) {

// Save the value in the EditText using the key NOTES

outState.putString("NOTES","Your string");

super.onSaveInstanceState(outState);

}

 // 2. Will save key value pairs to SharedPreferences
    private void saveSettings(){
 
        // SharedPreferences allow you to save data even if the user kills the app
        // MODE_PRIVATE : Preferences shared only by your app
        // MODE_WORLD_READABLE : All apps can read
        // MODE_WORLD_WRITABLE : All apps can write
        // edit() allows us to enter key vale pairs
        SharedPreferences.Editor sPEditor = getPreferences(Context.MODE_PRIVATE).edit();
 
        // Add the key "NOTES" and assign it to the value
        sPEditor.putString("NOTES", notesEditText.getText().toString());
 
        // Save the shared preferences
        sPEditor.commit();
 
    }

// 2. Will save key value pairs to SharedPreferences

private void saveSettings(){

// SharedPreferences allow you to save data even if the user kills the app

// MODE_PRIVATE : Preferences shared only by your app

// MODE_WORLD_READABLE : All apps can read

// MODE_WORLD_WRITABLE : All apps can write

// edit() allows us to enter key vale pairs

SharedPreferences.Editor sPEditor = getPreferences(Context.MODE_PRIVATE).edit();

// Add the key "NOTES" and assign it to the value

sPEditor.putString("NOTES", notesEditText.getText().toString());

// Save the shared preferences

sPEditor.commit();

}

============================================= Setting values in Preference:

// MY_PREFS_NAME - a static String variable like: 
//public static final String MY_PREFS_NAME = "MyPrefsFile";
SharedPreferences.Editor editor = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE).edit();
 editor.putString("name", "Elena");
 editor.putInt("idName", 12);
 editor.commit();

// MY_PREFS_NAME - a static String variable like:

//public static final String MY_PREFS_NAME = "MyPrefsFile";

SharedPreferences.Editor editor = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE).edit();

editor.putString("name", "Elena");

editor.putInt("idName", 12);

editor.commit();

Retrieve data from preference:

SharedPreferences prefs = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE); 
String restoredText = prefs.getString("text", null);
if (restoredText != null) {
  String name = prefs.getString("name", "No name defined");//"No name defined" is the default value.
  int idName = prefs.getInt("idName", 0); //0 is the default value.
}

SharedPreferences prefs = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE);

String restoredText = prefs.getString("text", null);

if (restoredText != null) {

String name = prefs.getString("name", "No name defined");//"No name defined" is the default value.

int idName = prefs.getInt("idName", 0); //0 is the default value.

}

Android SharedPreferences in Fragment

// this = your fragment
SharedPreferences preferences = this.getActivity().getSharedPreferences("pref", Context.MODE_PRIVATE);

1 2	// this = your fragment SharedPreferences preferences = this.getActivity().getSharedPreferences("pref", Context.MODE_PRIVATE);

shubham sharma October 24, 2016 Read More

New Dev Point

Some problems explained

Fragment

ViewPager PagerAdapter not updating the View

shared preference