StackOverflow2013

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copied!<p>There are a number of ways you can do this so I'll just outline 2 ways I would do this.</p> <p>Option 1. use a listener</p> <p>create an interface </p> <pre><code>public interface Listener { public abstract void onEvent(); } </code></pre> <p>in the broadcast receiver create a static reference and setter</p> <pre><code>private static MessageListener mListener = null; @Override public void onReceive(Context context, Intent intent) { //stuff if(mListener != null) mListener.onEvent(); } public static void setListener(Listener l) { mListener = l; } </code></pre> <p>then implement the listener in the Activity</p> <pre><code>class MyActivity implements Listener{ @Override public void onResume(){ //register the listener, should probably unregister in onDestroy BroadCastReceiver.setListener(this); } @Override public void onEvent(){ //do something } } </code></pre> <p>Option 2. use an intent</p> <p>In the broadcast receiver</p> <pre><code>Intent intent = new Intent(); Bundle bundleToSend = new Bundle(); //BUNDLE_EXTRA,DO_SOME_ACTION and ACTION_KEY are just constants so just define them somewhere bundleToSend.putInt(ACTION_KEY, DO_SOME_ACTION); intent.putExtra(BUNDLE_EXTRA, bundleToSend); intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP); startActivity(intent); </code></pre> <p>The flag <code>FLAG_ACTIVITY_SINGLE_TOP</code> will start the activity if its not started or if it is running it will be caught in <code>onNewIntent()</code> so you will need to put some code in both the <code>onCreate()</code> and <code>onNewIntent()</code> to extract the bundle and check for the action.</p> <pre><code>final Bundle bundleReceived = intent.getBundleExtra(BUNDLE_EXTRA); if (bundleReceived.getInt(ACTION_KEY) == DO_SOME_ACTION) { //do something } </code></pre> <p>Option 1 is really only useful for when the broadcast receiver is only going to be receiving when the activity is at the forefront. Option 2 is more versatile and can be used even when the app is not running (eg the broadcast receiver is run in a service started on boot) so that the activity will be started and the action performed no matter the state of the activity.</p>

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