Question

While investigating memory issues in our application, it turns out that if the application Activity is a MapActivity, the first instance of it won’t be finalized. Leading to other memory leak such as the view passed to setContentView.

Does anyone notice that before?

Here is the testing code showing that “MainActivity : 1” is not finalized whereas it is if MainActivity inherits from Activity.

To test, one needs to change device or emulator orientation many times.

import com.google.android.maps.MapActivity;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends MapActivity {
  private static final String  defaultTag          = "MA";

  private static final boolean isDebugModeActivate = true;
  private static final boolean isClassTagDisplayed = false;
  private static final boolean isWebModeActivate   = false;

  static public void d(Object thiso, String message)
  {
      String tag = defaultTag + (isClassTagDisplayed == true ? "_" + thiso.getClass().getSimpleName() : "");
      message = (isClassTagDisplayed == false ? thiso.getClass().getSimpleName() + " : " : "") + message;
      Log.d(tag, message);
  }

  public MainActivity()
  {
    counter++;
    uid++;
    id = uid;
    d(this, id + " tst constructor (" + counter + ")");
  }
  private static int counter = 0;
  private static int uid = 0;
  private final int id;

  protected void finalize() throws Throwable
  {
    counter--;
    d(this, id + " tst finalize (" +counter + ") ");
    super.finalize();
  }

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

    @Override
    protected boolean isRouteDisplayed()
    {
      return false;
    }
}

Thank you,
David

Answer 1

Perhaps you should exchange notes with NickT here