我只是在尝试这个小样例项目,它所做的事情如下: Activity一有一个按钮可以发送广播。Activity二在接收到广播时显示一个toast提示。 以下是代码,但广播从未被接收。我错在哪里了?
发送广播
public class SendBroadcast extends Activity {
public static String BROADCAST_ACTION = "com.unitedcoders.android.broadcasttest.SHOWTOAST";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void sendBroadcast(View v){
Intent broadcast = new Intent();
broadcast.setAction(BROADCAST_ACTION);
sendBroadcast(broadcast);
}
}
接收它
public class ToastDisplay extends Activity {
private BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(getApplicationContext(), "received", Toast.LENGTH_SHORT);
}
};
@Override
protected void onResume() {
IntentFilter filter = new IntentFilter();
filter.addAction(SendBroadcast.BROADCAST_ACTION);
registerReceiver(receiver, filter);
super.onResume();
}
@Override
protected void onPause() {
unregisterReceiver(receiver);
super.onPause();
}
}
清单
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".SendBroadcast" android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".ToastDisplay">
<intent-filter>
<action android:name="com.unitedcoders.android.broadcasttest.SHOWTOAST"></action>
</intent-filter>
</activity>
</application>