Android broadcast receiver

BroadcastReceiver

Message:

1. global

   [code language=”java”]
   mContext.sendBroadcast(mIntent);
   [/code]

2. local

   [code language=”java”]
   LocalBroadcastManager.getInstance(mContext).sendBroadcast(mIntent);
   [/code]

3. ordered

   [code language=”java”]
   mContext.sendOrderedBroadcast(mIntent, mPermissionStr);
   [/code]

Why?

• to get message from OS
• to get message from other apps
• to get message from inner components

[code language=”java”]
public class MyBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
StringBuilder sb = new StringBuilder();
sb.append("Action: " + intent.getAction() + "\n");
sb.append("URI: " + intent.toUri(Intent.URI_INTENT_SCHEME).toString());
String log = sb.toString();
Toast.makeText(context, log, Toast.LENGTH_LONG).show();
}
}
[/code]

onReceive lifecycle

• default in UI thread
• there is 10 sec to complete

Create

[code language=”java”]
BroadcastReceiver mReceiver = new MyBroadcastReceiver();
IntentFilter mFilter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
intentFilter.addAction(Intent.ACTION_AIRPLANE_MODE_CHANGED);
mContext.registerReceiver(mReceiver, mfilter);
//foo
mContext.unregisterReceiver(mReceiver, mFilter);
[/code]

another way

[code]
<receiver android:name=".MyBroadcastReceiver">
<intent-filter>
<action android:name="android.intent.action.ACTION_AIRPLANE_MODE_CHANGED" />
</intent-filter>
</receiver>
[/code]