Communication between BroadcastReceiver and Activity - android

Question

I have a broadcast receiver in my app which is fired every time the user gets an incoming call. Now, when it happens, I need the broadcast receiver to invoke a specific method in a specific activity. Now, I tried to make this method static and therefore available, but something tells me it is a very bad idea.

Accordingly, I tried to instantiate the broadcast receiver inside my activity without declaring it in my manifest but the problem is - when the app is off, the activity is not exist and therefore I can't invoke my method.

So my question is - How can I invoke this method when the broadcast receiver is fired up, without making it "public static"?

Here is my activity code(I have deleted the irrelevant parts)

package com.silverfix.ringo.activities;  import com.silverfix.ringo.R; import com.silverfix.ringo.activities.fragments.DataManagerFragment;  import android.app.ActionBar; import android.app.Activity; import android.app.FragmentTransaction; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter;  public class RingtonesActivity extends Activity{      private DataManagerFragment dataManagerFragment;     private IntentFilter filter;     private BroadcastReceiver phoneCall;      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_ringtones);         ActionBar ab = getActionBar();         ab.setDisplayShowTitleEnabled(false);         ab.setDisplayHomeAsUpEnabled(true);         dataManagerFragment = new DataManagerFragment();         FragmentTransaction ft = getFragmentManager().beginTransaction();         ft.add(dataManagerFragment, "DataManagerFragment");         ft.commit();         filter = new IntentFilter();         filter.addAction("android.intent.action.PHONE_STATE");         phoneCall = new BroadcastReceiver() {              @Override             public void onReceive(Context context, Intent intent) {                 dataManagerFragment.act();             }         };         registerReceiver(phoneCall, filter);     } } 

Answer 1

You can use observers , like

public class MyReceiver extends BroadcastReceiver {     public MyReceiver() {     }      @Override     public void onReceive(Context context, Intent intent) {         ObservableObject.getInstance().updateValue(intent);     } } 

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public class MainActivity extends Activity implements Observer {     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          ObservableObject.getInstance().addObserver(this);     }      @Override     public void update(Observable observable, Object data) {                     Toast.makeText(this, String.valueOf("activity observer " + data), Toast.LENGTH_SHORT).show();     } } 

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public class ObservableObject extends Observable {     private static ObservableObject instance = new ObservableObject();      public static ObservableObject getInstance() {         return instance;     }      private ObservableObject() {     }      public void updateValue(Object data) {         synchronized (this) {             setChanged();             notifyObservers(data);         }     } } 

Receiver can be used via manifest. ObservableObject - must be singleton.