Memory-leak-solution-inner-classesSolution.java

public class GoodActivity extends Activity {

    TextView textView;
    AsyncTask task;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_async);
        textView = (TextView) findViewById(R.id.textView);

        task = new BackgroundTask(textView).execute();
    }
    
    @Override
    protected void onDestroy() {
        task.cancel(true);
        super.onDestroy();
    }

    private static class BackgroundTask extends AsyncTask<Void, Void, String> {

        private final WeakReference<TextView> textViewReference;

        public BackgroundTask(TextView resultTextView) {
            this.textViewReference = new WeakReference<>(resultTextView);
        }
        
        @Override
        protected void onCancelled() {
            // Cancel task. Code omitted.
        }

        @Override
        protected String doInBackground(Void... params) {
            // Do background work. Code omitted.
            return "some string";
        }

        @Override
        protected void onPostExecute(String result) {
            TextView view = textViewReference.get();
            if (view != null) {
                view.setText(result);
            }
        }
    }
}