Question

I have a View that was created at runtime then I draw some canvas on that View (runtime), after that I rotate my screen. All data was gone (reset). So I put the some code in AndroidManifest.xml like this

android:configChanges="keyboardHidden|orientation"

in my <activity> then I put an @Override function

@Override
public void onConfigurationChanged(Configuration newConfig) {
  super.onConfigurationChanged(newConfig);      
  setContentView(R.layout.main);
  LinearLayout layout = (LinearLayout) findViewById(R.id.myPaint);
  layout.addView(mView); 
}

But this didn’t solve my problem. I want to keep my data from View(runtime) on every single rotation.

Here’s my onCreate function:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mView = new MyView(this);
    setContentView(mView);

    mView.requestFocus();
    setContentView(R.layout.main);
    LinearLayout layout = (LinearLayout) findViewById(R.id.myPaint);
    layout.addView(mView);
}

Answer 1

You need to save and load the data you want to retain. Even though you’re handling the screen rotation yourself when you modified the Manifest the way you did, you’re still reloading the view yourself. Reread the reference document on Handling Runtime Changes. You need to store your data and reload it accordingly. Otherwise it will be lost when the application restarts or when you reload your ContentView.

http://developer.android.com/guide/topics/resources/runtime-changes.html