Question

我正在尝试学习使用Android BroadcasReceiver。我写了这段代码，但它不起作用......我试着举例来改变时间...... 这有什么不对？

我在Manifest中添加了：

<receiver android:name="com.example.broadcastreceiverspike.Broadcast" >
        <intent-filter android:priority="100">
            <action android:name="android.intent.action.ACTION_SCREEN_ON" />
            <action android:name="android.intent.action.ACTION_SCREEN_OFF" />
            <action android:name="android.intent.action.TIME_SET" />
        </intent-filter>
</receiver>

我简单的BroadcasReceiver：

    public class Broadcast extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
           Log.d("BROADCAST", "It worked");
           Toast.makeText(context, "BROADCAST",  Toast.LENGTH_LONG).show();
        }
}

我的主要活动（默认主要活动）

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

Answer 1

我解决了！

“与其他广泛的意图不同，对于Intent.ACTION_SCREEN_OFF和Intent.ACTION_SCREEN_ON，你不能在你的Android Manifest中声明它们！我不确定为什么，但它们必须在你的JAVA代码中的IntentFilter中注册”

http://thinkandroid.wordpress.com/2010/01/24/handling-screen-off-and-screen-on-intents/

清单

    <receiver android:name=".Broadcast" >
        <intent-filter>                
            <action android:name="android.intent.action.TIME_SET" />

        </intent-filter>
    </receiver>

主要活动类

公共类MainActivity扩展了Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

     // INITIALIZE RECEIVER
    IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
    filter.addAction(Intent.ACTION_SCREEN_OFF);
    BroadcastReceiver mReceiver = new Broadcast();
    registerReceiver(mReceiver, filter);

}

}

我的广播接收器

public class Broadcast扩展BroadcastReceiver {

public static String TAG = "BROADCAST";

@Override
public void onReceive(Context context, Intent intent) {

    if (intent.getAction().equals(Intent.ACTION_TIME_CHANGED))
    {
        Log.d(TAG, "BROADCAST Cambio di orario");
        Toast.makeText(context, "BROADCAST Cambio di orario", Toast.LENGTH_LONG).show();
    }
    else if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
        // DO WHATEVER YOU NEED TO DO HERE
        Log.d(TAG, "BROADCAST Screen OFF");
        Toast.makeText(context, "Screen OFF", Toast.LENGTH_LONG).show();
    } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
        // AND DO WHATEVER YOU NEED TO DO HERE
        Log.d(TAG, "BROADCAST Screen ON");
        Toast.makeText(context, "BROADCAST Screen ON", Toast.LENGTH_LONG).show();
    }
}

}

Answer 2

查看有关广播接收器的this tutorial。

<强>更新我不确定你是否在使用本教程，因为本教程中有很多有用的东西，比如：

@Override
public void onResume() {
    super.onResume();

    // Register mMessageReceiver to receive messages.
    LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver,
        new IntentFilter("my-event"));
    }

    // handler for received Intents for the "my-event" event 
    private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
        // Extract data included in the Intent
        String message = intent.getStringExtra("message");
        Log.d("receiver", "Got message: " + message);
    }
};

@Override
protected void onPause() {
    // Unregister since the activity is not visible
    LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
    super.onPause();
}

换句话说，您已创建自定义broadcast receiver class，但尚未使用它。

另请查看this。

Answer 3

您是否添加了所需的预设？

uses-permission android：name =“android.permission.READ_PHONE_STATE”

这是一个在屏幕关闭或打开或锁定时处理的接收器：

public class ScreenReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent)
{
    if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF))
    {   



    }
    else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON))
    {


    }
    else if(intent.getAction().equals(Intent.ACTION_USER_PRESENT))
    {

    }

}

} 这是清单：

    <receiver android:name=".ScreenReceiver">
        <intent-filter>
            <action android:name="android.intent.action.USER_PRESENT" />        
  <action android:name="android.intent.action.SCREEN_OFF" />
  <action android:name="android.intent.action.SCREEN_ON" />

        </intent-filter>
    </receiver>

Answer 4

我遇到了同样的问题，我修复了它（在4.3和5.1上测试过）。我可以在清单中声明“android.intent.action.USER_PRESENT”，只要你有READ_PHONE_STATE权限，就可以了！我的迷你应用程序包括一个广播接收器，它响应屏幕的开/关状态，并运行一个连续语音识别的后台服务。如果屏幕关闭，则关闭识别。这是代码，享受：MANIFEST：

<uses-permission android:name="android.permission.READ_PHONE_STATE"/> <receiver android:name="classes.VoiceLaunchReceiver" >
            <intent-filter>                
                <action android:name="android.intent.action.USER_PRESENT" />    
                <action android:name="android.intent.action.BOOT_COMPLETED" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </receiver>

广播接收器：

public class VoiceLaunchReceiver extends BroadcastReceiver {
    @Override  
    public void onReceive(Context ctx, Intent intent) {     
        Intent service = new Intent(ctx, VoiceLaunchService.class);
     //   service.putExtra(action, true);
        Log.i("joscsr","Incoming Voice Launch Broadcast...");  

        if (intent.getAction().equals(Intent.ACTION_USER_PRESENT)) {
            Log.i("joshcsr", "************\nCSR Resumed (BC)\n************");
            ctx.startService(service);
            }
        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
            Log.i("joshcsr", "************\nCSR STOPPED by SCREEN (BC)\n************");
            ctx.stopService(service);  
            }
        }  
}

您可以想象，我的USER_PRESENT广播接收器未在其他任何地方注册。我在我的服务的onCreate方法中注册了ACTION_SCREEN_OFF和ON，这是由我的接收者触发的。

@Override
public void onCreate() {
    super.onCreate();
    //Register screen ON/OFF BroadCast
    launcher=new VoiceLaunchReceiver();
    IntentFilter i=new IntentFilter(Intent.ACTION_SCREEN_OFF);
    i.addAction(Intent.ACTION_SCREEN_ON);               
    registerReceiver(launcher,i);
    Log.d("joshcsr","VoiceLaunch Service CREATED"); 
    }

最后，我在我的服务的onDestroy（）中取消注册屏幕：

@Override
    public void onDestroy() {
        super.onDestroy();
        unregisterReceiver(launcher);}

为什么我的BroadcastReceiver不起作用？

4 个答案: