Question

我正在尝试让我的机器人在注册蓝牙连接时启动一个活动，我拥有所有适当的权限，并且此代码运行良好，直到它需要启动意图。之后它崩溃了。现在我没有一个logcat用于我的手机上的实时测试。

所以，让我们玩另一个游戏＆＃34;我如何解决这个问题？＆＃34;

public class detectService extends Service {

public void onCreate() {
    IntentFilter filter1 = new IntentFilter(
            BluetoothDevice.ACTION_ACL_CONNECTED);
    this.registerReceiver(mReceiver, filter1);
    Toast.makeText(this, "Starting Service!", Toast.LENGTH_LONG).show();
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    return START_STICKY;
}

// The BroadcastReceiver that listens for bluetooth broadcasts
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        BluetoothAdapter device = intent
                .getParcelableExtra(BluetoothDevice.ACTION_ACL_CONNECTED);

        if (device.equals(action)) {
            // Device is now connected
            // Start Second Activity
            Intent otherIntent = new Intent(detectService.this,
                    otherClass.class);
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity(otherIntent);
        }
    };
};
@Override
public IBinder onBind(Intent intent) {
    // TODO Auto-generated method stub
    return null;
}
}

感谢有人在这里的帮助，我现在手机上有logcat！以下是错误的副本：

E/AndroidRuntime(  567): FATAL EXCEPTION: main
E/AndroidRuntime(  567): java.lang.RuntimeException: Error receiving broadcast Intent { act=android.bluetooth.device.action.ACL_CONNECTED (has extras) } in lionsimages.com.bluetoothalert.detectService$1@4051ad68
E/AndroidRuntime(  567):    at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:722)
E/AndroidRuntime(  567):    at android.os.Handler.handleCallback(Handler.java:587)
E/AndroidRuntime(  567):    at android.os.Handler.dispatchMessage(Handler.java:92)
E/AndroidRuntime(  567):    at android.os.Looper.loop(Looper.java:130)
E/AndroidRuntime(  567):    at android.app.ActivityThread.main(ActivityThread.java:3683)
E/AndroidRuntime(  567):    at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(  567):    at java.lang.reflect.Method.invoke(Method.java:507)
E/AndroidRuntime(  567):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864)
E/AndroidRuntime(  567):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622)
E/AndroidRuntime(  567):    at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(  567): Caused by: java.lang.NullPointerException
E/AndroidRuntime(  567):    at lionsimages.com.bluetoothalert.detectService$1.onReceive(detectService.java:39)
E/AndroidRuntime(  567):    at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:709)
E/AndroidRuntime(  567):    ... 9 more

Answer 1

试试这个：

 if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(action)) {
            // Device is now connected
            // Do your stuff here
        }

Answer 2

在onReceive()方法中执行此操作：

   BluetoothAdapter device = intent
            .getParcelableExtra(BluetoothDevice.ACTION_ACL_CONNECTED);

但是在这个广播Intent中没有额外的名字。如果您想从Intent获取设备，那么您需要这样做：

   BluetoothDevice device = intent
            .getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

但是，如果我查看您的代码，您似乎只想检查Intent ACTION是否为ACTION_ACL_CONNECTED。如果这就是您想要做的全部，那么请改用此代码：

public void onReceive(Context context, Intent intent) {
    String action = intent.getAction();

    if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(action)) {
        // Device is now connected
        // Start Second Activity
        Intent otherIntent = new Intent(detectService.this,
                otherClass.class);
        // NOTE: I changed "intent" to "otherIntent" in the following line as well!
        otherIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(otherIntent);
    }
};

Answer 3

使用此代码，在某些情况下，还需要成功完成并运行广播接收器代码。

    if( "android.intent.action.BOOT_COMPLETED".equals(intent.getAction())) 
      { 
                  //You broad cast activity code ...
       }

有意图的问题

3 个答案: