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Android Android Activity Lifecycle The Activity Lifecycle Saving and Retrieving Instance State

don't get it

pls help

MainActivity.java
import android.content.Intent;
import android.view.View;

public class MainActivity extends Activity {

  public TextView mTextView;
  private static final String KEY_USERENTRY = "KEY_USERENTRY";
  private int val = 10;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mTextView = (TextView) findViewById(R.id.textView);
  }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt(KEY_USERENTRY, val);
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        val = savedInstanceState.getInt(KEY_USERENTRY);
        mTextView.setText(val);
    }
}

1 Answer

Fernando Batista
Fernando Batista
3,295 Points

Hi Joe, well, I don't exactly what's the problem that you're facing.

But, I found a problem with your code that's easy to fix.

In the method nRestoreInstanceState, you're setting the "val" to the your text view. That's the problem, when you try to set a text in a text view, you have to put in the method a String variable, and in your code you're using a int variable.

To fix it, you just have to convert the int to a variable, you can do it easily using the method String.valueOf( int value).

In your code, that would be like mTextView.setText(String.valueOf(val));

I hope it helps!