Question

任何人都可以告诉如何传递一个字符串或整数，从活动到服务。我试图通过一个整数setpossition（4），但它不需要，它始终需要0服务启动我不知道为什么我不能通过使用服务实例从Activity操纵。

    public class MainMP3 extends Activity{
Button play,stop,prev,next,list;

static final String MEDIA_PATH = new String("/sdcard/");
 Activity main_activity;

@Override
public void onCreate(Bundle savedInstanceState) {
    main_activity=this;
    super.onCreate(savedInstanceState);
    setContentView(R.layout.mp3interface);


    play= (Button) findViewById(R.id.play);
    stop= (Button) findViewById(R.id.stop);
    prev= (Button) findViewById(R.id.prev);
    next= (Button) findViewById(R.id.next);
    list= (Button) findViewById(R.id.listofsongs);


    play.setOnClickListener(new StartClick());  

    stop.setOnClickListener(new StopClick());  

    prev.setOnClickListener(new PullClick());  





    next.setOnClickListener(new View.OnClickListener() {

        @Override                           
        public void onClick(View v) {


        }
    });


    list.setOnClickListener(new View.OnClickListener() {

        @Override                           
        public void onClick(View v) {

            Intent i= new Intent(MainMP3.this,songlist.class);
            startActivity(i);

        }
    });

}




  ServiceMP3 service = null;

  ServiceConnection connection = new ServiceConnection() {

        @Override  // Called when connection is made
        public void onServiceConnected(ComponentName cName, IBinder binder) {
            service = ((ServiceMP3.SlowBinder)binder).getService();
        }
        @Override   //
        public void onServiceDisconnected(ComponentName cName) {
            service = null;
        }
    };


    private class StartClick implements View.OnClickListener {      
        public void onClick(View v) {
            Intent intent = new Intent(main_activity,ServiceMP3.class);
            service.setposition(4);
            main_activity.startService(intent);



        }
    }

    private class StopClick implements View.OnClickListener {       
        public void onClick(View v) {
            Intent intent = new Intent(main_activity,ServiceMP3.class);
            main_activity.stopService(intent);

        }
    }


    private class PullClick implements View.OnClickListener {       
        public void onClick(View v) {



        }
    }


        }

Answer 1

您必须在intent中设置值并在启动服务时传递该intent，你可以在服务onStartCommand（Intent intent，int flags，int startId）中获取值。

这是你必须通过意图传递整数的方法。

private class StartClick implements View.OnClickListener {      
            public void onClick(View v) {
                Intent intent = new Intent(main_activity,ServiceMP3.class);
                intent.putExtra("position",4);
                main_activity.startService(intent);

            }
        }

您可以获得价值就是这样的服务

 public int onStartCommand(Intent intent, int flags, int startId) {
    if(intent != null){
       int position = intent.getIntExtra("position", 0);
       }
    }

Answer 2

如果您只是在谈论将数据传递到Service，那么这是我的解决方案。通过Intent启动服务时，请将您要传递的任何数据放入Service中的Bundle，如下所示：

Bundle bundle = new Bundle();
bundle.putInt("my_Val", 4);
intent.putExtras(bundle);

然后像正常一样使用Intent。另一方面，在Service中，只需获取Bundle：

中的数据

Bundle bundle = intent.getExtras();
int myVal = bundle.getInt("my_Val", 0); //0 is just the default value used in case of error

Answer 3

创建一个内部类，在您希望获取数据的活动中扩展BroadcastReceiver：

private BroadcastReceiver ReceivefromService = new BroadcastReceiver(){
    @Override
    public void onReceive(Context context, Intent intent)
    {
        //get the data using the keys you entered at the service
        String IncomingSms=intent.getStringExtra("incomingSms");//
        String phoneNumber=intent.getStringExtra("incomingPhoneNumber");

    }
};

将此添加到onPause()：

@Override
protected void onPause() {
    super.onPause();
    try {
        unregisterReceiver(ReceivefromService);
    } catch (IllegalArgumentException e) {
        if (e.getMessage().contains("Receiver not registered")) {
            Log.i("TAG","Tried to unregister the reciver when it's not registered");
        }
        else
        {
            throw e;
        }
    }
}

将此添加到onResume()：

protected void onResume() {
    super.onResume();
    filter.addAction("android.intent.action.SmsReceiver");
    registerReceiver(ReceivefromService, filter);
    //the first parameter is the name of the inner class we created.
}

在接收器/服务中创建一个启动广播的意图，如下所示：

Intent i = new Intent("android.intent.action.SmsReceiver").putExtra("incomingSms", message);
i.putExtra("incomingPhoneNumber", phoneNumber);
context.sendBroadcast(i);

就是这样！古德勒克！

如何在Android中将字符串从活动传递到服务？

3 个答案: