Losing data when rotate screen

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//Use onSaveInstanceState(Bundle) and onRestoreInstanceState

@Override
public void onSaveInstanceState(Bundle 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.  

  super.onSaveInstanceState(savedInstanceState);  
}  

//onRestoreInstanceState  

@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");  
}

This is how you save your data when the system deletes it on rotation.

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