android - 从android中的 Activity 启动广播接收器

Question

我想从一个 Activity 中启动一个广播接收器。我有一个 Second.java 文件，它扩展了一个广播接收器和一个 Main.java 文件，我必须从中启动广播接收器。我也尝试在 Main.java 中按如下方式执行所有操作，但不知道如何在 list 文件中定义...

Main.java:

public class Main extends Activity {
/** Called when the activity is first created. */
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
String rec_data = "Nothing Received";
private BroadcastReceiver myReceiver = new BroadcastReceiver() {

        public void onReceive(Context context, Intent intent) {
            // TODO Auto-generated method stub
            if( intent.getStringExtra("send_data")!=null)
                    rec_data = intent.getStringExtra("send_data");
            Log.d("Received Msg : ",rec_data);
        }
    }; 
    }
    protected void onResume() {
        IntentFilter intentFilter = new IntentFilter();
        //intentFilter.addDataType(String);
        registerReceiver(myReceiver, intentFilter);
        super.onResume();
    }

  @Override
protected void onPause() {
// TODO Auto-generated method stub
    super.onPause();
    this.unregisterReceiver(this.myReceiver);
}

}

如果我不能像上面那样在一个类中做所有事情，我如何从 Main.java 调用广播接收器？谁能让我知道我在哪里做错了？谢谢!

Answer 1

使用这个为什么发送自定义广播:

定义一个 Action 名称:

public static final String BROADCAST = "PACKAGE_NAME.android.action.broadcast";

AndroidManifest.xml 注册接收者:

<receiver android:name=".myReceiver" >  
    <intent-filter >  
        <action android:name="PACKAGE_NAME.android.action.broadcast"/>  
    </intent-filter>  
</receiver> 

注册接收者:

IntentFilter intentFilter = new IntentFilter(BROADCAST);
registerReceiver( myReceiver , intentFilter);

从您的 Activity 发送广播:

Intent intent = new Intent(BROADCAST);  
        Bundle extras = new Bundle();  
        extras.putString("send_data", "test");  
        intent.putExtras(extras);  
        sendBroadcast(intent);

你的广播接收器:

private BroadcastReceiver myReceiver = new BroadcastReceiver() {

        public void onReceive(Context context, Intent intent) {
            // TODO Auto-generated method stub
             Bundle extras = intent.getExtras();
           if (extras != null){  
           {
                    rec_data = extras.getString("send_data");
            Log.d("Received Msg : ",rec_data);
            }
        }
    };

有关自定义广播的更多信息，请参阅 Custom Intents and Broadcasting with Receivers