getting context in AsyncTask

Question

I am trying to get the context in my AsyncTask of the class called Opciones(this class is the only one that call that task) but I don't know how to do it, I saw some code like this:

      protected void onPostExecute(Long result) {      Toast.makeText(Opciones.this,"Subiendo la foto. ¡Tras ser moderada empezara a ser votada!: ", Toast.LENGTH_LONG).show();  } 

But it doesn't work for me it says: "No enclosing instance of the type Opciones in scope"

Answer 1

You need to do following things.

• when you want to use AsyncTask, extend that in other class say MyCustomTask.
• in constructor of new class, pass Context

Example

public class MyCustomTask extends AsyncTask<Void, Void, Long> {      private Context mContext;      public MyCustomTask (Context context){          mContext = context;     }      //other methods like onPreExecute etc.     protected void onPostExecute(Long result) {          Toast.makeText(mContext,"Subiendo la foto. ¡Tras ser moderada empezara a ser votada!: ", Toast.LENGTH_LONG).show();      } } 

And instantiate class by following.

MyCustomTask task = new MyCustomTask(context); task.execute(..); 

Answer 2

Holding a weak reference to the host Activity will prevent memory leaks.

static class MyTask extends AsyncTask<Void, Void, Void> {     // Weak references will still allow the Activity to be garbage-collected     private final WeakReference<Activity> weakActivity;      MyTask(Activity myActivity) {       this.weakActivity = new WeakReference<>(myActivity);     }      @Override     public Void doInBackground(Void... params) {       // do async stuff here     }      @Override     public void onPostExecute(Void result) {       // Re-acquire a strong reference to the activity, and verify       // that it still exists and is active.       Activity activity = weakActivity.get();       if (activity == null           || activity.isFinishing()           || activity.isDestroyed()) {         // activity is no longer valid, don't do anything!         return;       }        // The activity is still valid, do main-thread stuff here     }   }