android - 如何在服务中获取 Intent？

Question

我有这个 Intent :

Intent serviceIntent = new Intent(getApplicationContext(), Servicio.class);
serviceIntent.putExtra(MainActivity.EXTRA_BT_DEVICE, btDevice);
getApplicationContext().startService(serviceIntent);

但由于某种原因，在具有此代码的服务中:

btDevice = (BluetoothDevice) params.getExtras().get(MainActivity.EXTRA_BT_DEVICE); 
// btDevice = getParcelableExtra(EXTRA_BT_DEVICE)

它说 Intent 是空的，但它在 Activity 上不是空的。

Answer 1

您需要将服务绑定(bind)到 Activity 以访问服务方法。使用服务对象，您可以调用服务方法并将值从 Activity 传递到服务。把这段代码写在activity-

 Servicio mService;

@Override
protected void onResume() {
    super.onResume();
     Intent bindIntent = new Intent(this, Servicio.class);
    bindService(bindIntent, mServiceConnection, Context.BIND_AUTO_CREATE);

}
@Override
protected void onPause() {
    super.onPause();

    unbindService(mServiceConnection);
    mService = null;
}

private ServiceConnection mServiceConnection = new ServiceConnection() {
    public void onServiceConnected(ComponentName className, IBinder rawBinder) {
        mService = ((Servicio.LocalBinder) rawBinder).getService();

    }

    public void onServiceDisconnected(ComponentName classname) {
        ////     mService.disconnect(mDevice);
        mService = null;
    }
};

mService 是您的服务类的对象，使用它您可以将值传递给服务。

写在服务类中

private final IBinder mBinder = new LocalBinder();
public class LocalBinder extends Binder {
    public Servicio getService() {
        return Servicio.this;
    }
}

@Override
public IBinder onBind(Intent intent) {
    return mBinder;
}