Android Service后台处理结果给Activity

AndroidManifest

<service android:name=".serviet.model.MyTimerService"></service>

第一步

public class ServiceActivity extends Activity {


    @BindView(R.id.stop_bu)
    Button stopBu;
    @BindView(R.id.statr_bu)
    Button statrBu;

    public static TextView serviet_tv;
    public static Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);

            if (msg.what == 1) {
                serviet_tv.setText((String) msg.obj);
            }
        };
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_service);
        ButterKnife.bind(this);
        serviet_tv = (TextView) findViewById(R.id.serviet_tv);

//        stop_bu.setOnClickListener(view ->{
//            stopService(new Intent(ServiceActivity.this,MyTimerService.class));
//        });
//

    }


    @OnClick({R.id.stop_bu, R.id.statr_bu})
    public void onViewClicked(View view) {
        switch (view.getId()) {
            case R.id.stop_bu:
                stopService(new Intent(ServiceActivity.this, MyTimerService.class));
                break;
            case R.id.statr_bu:
                startService(new Intent(ServiceActivity.this, MyTimerService.class));
                break;
        }
    }


}

第二步

//后台定时执行 sercice请求 执行后的结果，怎么传递给前台Activity
public class MyTimerService extends Service {
    Timer timer;
    TimerTask task;

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

    @Override
    public void onCreate() {
        timer = new Timer();
        super.onCreate();
    }


    //开始服务
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        task = new TimerTask() {
            @Override
            public void run() {
                Log.i("www", "222222222");
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
                String str = sdf.format(new Date());
                Message message = new Message();
                message.what = 1;
                message.obj = str;
                ServiceActivity.handler.sendMessage(message);

            }
        };
        timer.schedule(task, 0, 100);
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        timer.cancel();
        super.onDestroy();
    }
}