I have an application that uses a Service and some list activities.
When the activities are opened, I can see the heap usage increase in
DDMS. When the activities are closed, the heap usage decreases
slightly. The service is still running in the background at this
point. If the activity is started again by re-running the application
and then closed, the heap usage increases again then decreases, but
never returns to the original level before the activity was first
opened. If it repeatedly (10-15 times) open the activity then close
the activity, the heap size (both MB and # Objects) balloons!
I'd expect ListActivity's onDestroy to take care of itself when it
gets destroyed. What am I missing with this? Am I using ListActivity
incorrectly?
If I examine the heap using MAT, I see 10-15 ListView objects.
Unfortunately, I've not got much experience with MAT, but I think it
means that the instances are still hanging around rather than being
garbage collected. Can anyone explain what's going on?
A test app similar to my real code is below. Create a new android
application, add this to the manifest:
<service android:name="LeakTestService"/>
and these java files:
LeakTestActivity.java
-------------
package LeakTest.Test;
import java.util.ArrayList;
import java.util.HashMap;
import android.app.Activity;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.SimpleAdapter;
public class LeakActivity extends ListActivity {
ArrayList> _Data=new ArrayList>();
ArrayAdapter _Adapter;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent svc = new Intent(this.getApplicationContext(),
LeakTestService.class);
startService(svc);
// the problem happens with both SimpleAdapter and
ArrayAdapter
//_Adapter = new SimpleAdapter(this.getApplicationContext(),
_Data, android.R.layout.two_line_list_item, new String[]
{ "line1","line2" }, new int[] { android.R.id.text1,
android.R.id.text2 });
_Adapter = new ArrayAdapter(this.getApplicationContext(),
android.R.layout.simple_list_item_1, new String[] {"data1","data2"} );
// if this line is removed, the heap usage never balloons when
you repeatedly open+close it
getListView().setAdapter(_Adapter);
}
@Override
public void onDestroy() {
_Adapter=null; // this line doesn't help
getListView().setAdapter(null); // neither does this line
super.onDestroy();
}
}
LeakTestService.java
--------
package LeakTest.Test;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.widget.Toast;
public class LeakTestService extends Service {
@Override
public void onStart(Intent intent, int startId) {
Toast.makeText(getBaseContext(), "Service onStart",
Toast.LENGTH_SHORT).show();
}
@Override public void onDestroy() {
Toast.makeText(getBaseContext(), "Service onDestroy",
Toast.LENGTH_SHORT).show();
}
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}
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