How do i pass a context to an AsyncTask?

Question

I want to preform a Toast when a background task is completed, just to let the user know that it's finished.

I've made a new class for my asyncTask but i cannot use getApplicationContext() within this class.

I'm using task.execute(getTempFile(this), getApplicationContext()); to run the tasks. getTempFile returns a File object, and i was trying to pass the context as a Context object.

My Task class has 3 variables AsyncTask<Object, Integer, Integer> so the context is in the second object. However, this crashes the application.

Edit

public class LocationActivity extends Activity implements LocationListener {     protected void handleImage(Bitmap thumbnail){         PushDataToServer task = new PushDataToServer();         task.execute(getTempFile(this), getApplicationContext());     } }     public class PushDataToServer extends AsyncTask<Object, Integer, Integer> {      Context context;      @Override     protected Integer doInBackground(Object... params) {         // TODO Auto-generated method stub         this.context = (Context) params[1];         File file = (File) params[0];         return null;     }      protected void onPostExecute(String result) {             Toast toast = Toast.makeText(this.context, "All done!", Toast.LENGTH_SHORT);          toast.show();     }  } 

Answer 1

Pass a Context object into the AsyncTask's constructor.

Sample code:

public class MyTask extends AsyncTask<?, ? ,?> {     private Context mContext;      public MyTask(Context context) {         mContext = context;     }  } 

and then, when you are constructing your AsyncTask:

MyTask task = new MyTask(this); task.execute(...); 

Answer 2

Pass it in the constructor, not as a method parameter. Then you don't need to depend on the generic parameters.