set savedInstanceState Bundle in Activity

» android » set savedInstanceState Bundle in Activity

By : Malik Awan

Date : November 28 2020, 11:01 PM

This might help you This will make your code unreadable and hard to upkeep in the future. Moreover, you will be working against the architecture of the platform.
The correct approach is to send the data in the Intent which starts the Activity, or obtain all data in onCreate if bundle is null, like this:

code :

if(savedInstanceState == null)
    //Get data from db, resources etc.
else 
    //Do the restoring using the bundle, 
    //or just let it pass here and handle it in      
    //`onRestoreInstanceState`, both are correct

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When is the savedInstanceState bundle actually used?

By : Jake Maddox

Date : March 29 2020, 07:55 AM

help you fix your problem It's used when the Activity is forcefully terminated by the OS (ex: when your Activity is in the background and another task needs resources). When this happens, onSaveInstanceState(Bundle outstate) will be called and it's up to your app to add any state data you want to save in outstate.
When the user resumes your Activity, onCreate(Bundle savedInstanceState) gets called and savedInstanceState will be non-null if your Activity was terminated in a scenario described above. Your app can then grab the data from savedInstanceState and regenerate your Activity's state to how it was when the user last saw it.

onCreate(Bundle savedInstanceState) of second activity not loaded?

By : YamanM

Date : March 29 2020, 07:55 AM

hope this fix your issue If I did not misunderstand your question, you are trying to open the second activity by setContentView? In Android you are opening Activities with Intents and when you want to return you just call finish() in your second Activity. Opening your acitivity about is done with

code :

Intent newIntent = new Intent(this, AboutActivity.class);
startActivity(newIntent);

NullPointerException in savedInstanceState Bundle

By : user7506449

Date : March 29 2020, 07:55 AM

seems to work fine You should initialize your TextViews before calling setText method. So onCreate should be like this:

code :

        setContentView(R.layout.activity);

        die1 = (ImageView) findViewById(R.id.imageView1);
        die2 = (ImageView) findViewById(R.id.imageView2);
        dealButton = (Button) findViewById(R.id.dealButton);
        resetButton = (Button) findViewById(R.id.resetButton);
        resultsTextView = (TextView) findViewById(R.id.resultsTextView);
        myPointsTextView = (TextView) findViewById(R.id.myPointstTextView);
        housePointsTextView = (TextView) findViewById(R.id.housePointsTextView);
        pointsTextView = (TextView) findViewById(R.id.pointsTextView1);
        rollTextView = (TextView) findViewById(R.id.rollTextView);

          // check if app just started or is being restored from memory
          if ( savedInstanceState == null ) // the app just started running
          {
             winCount = 0; 
             loseCount = 0; 
          } 
          else 
          {
             winCount = savedInstanceState.getInt("MY_POINTS");
             loseCount = savedInstanceState.getInt("HOUSE_POINTS");

             resultsTextView.setText(savedInstanceState.getString("RESULTS"));
             pointsTextView.setText(savedInstanceState.getString("POINTS"));
             rollTextView.setText(savedInstanceState.getString("ROLL"));
          } 
...

Where is Bundle object created in onCreate(Bundle savedInstanceState)

By : max payne

Date : March 29 2020, 07:55 AM

Any of those help If you save the state of the application in a bundle (typically non-persistent, dynamic data in onSaveInstanceState), it can be passed back to onCreate if the activity needs to be recreated (e.g., orientation change) so that you don't lose this prior information. If no data was supplied, savedInstanceState is null.
You need to override onSaveInstanceState(Bundle savedInstanceState) and write the application state values you want to change to the Bundle parameter like this:

code :

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
  super.onSaveInstanceState(savedInstanceState);
  // Save UI state changes to the savedInstanceState.
  // This bundle will be passed to onCreate if the process is
  // killed and restarted.
  savedInstanceState.putBoolean("MyBoolean", true);
  savedInstanceState.putDouble("myDouble", 1.9);
  savedInstanceState.putInt("MyInt", 1);
  savedInstanceState.putString("MyString", "Welcome back to Android");
  // etc.
}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
  super.onRestoreInstanceState(savedInstanceState);
  // Restore UI state from the savedInstanceState.
  // This bundle has also been passed to onCreate.
  boolean myBoolean = savedInstanceState.getBoolean("MyBoolean");
  double myDouble = savedInstanceState.getDouble("myDouble");
  int myInt = savedInstanceState.getInt("MyInt");
  String myString = savedInstanceState.getString("MyString");
}

Is a fragment's savedInstanceState shared with the parent activity's savedInstanceState?

By : Will

Date : March 29 2020, 07:55 AM

This might help you Is the savedInstanceState of a fragment the same object as the savedInstanceState of the fragment's parent activity (or encapsulating fragment)?
No, it is different objects Bundle