Android Service 通过 BroadcastReceiver 更新Activity UI

1：MainActivity.java

public class MainActivity extends Activity {
    private TextView tvInfo = null;
    private BroadcastReceiver receiver = null;

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

        tvInfo = (TextView)findViewById(R.id.tvInfo);

        receiver = new BroadcastReceiver(){
            @Override
            public void onReceive(Context context, Intent intent) {
                String info = intent.getExtras().getString("data");
                tvInfo.setText(info);
            }
        };

        IntentFilter filter = new IntentFilter();
        filter.addAction("com.example.timejob.service");
        registerReceiver(receiver,filter);
    }

    @Override
    protected void onResume() {
        super.onResume();
        if(!isServiceRunning()){
            Intent intent  = new Intent(this,MyService.class);
            this.startService(intent);
            Log.d("onResume:", "服务运行");
        }
    }

    @Override
    public void onStop() {
        super.onStop();
        if(isServiceRunning()){
            Intent is  = new Intent(this,MyService.class);
            this.stopService(is);
            Log.d("onStop:", "服务关闭");
        }
        this.unregisterReceiver(receiver);
    }

    /*
     * 判断service是否运行
     */
    private boolean isServiceRunning() {
        ActivityManager manager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
        for (RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
            if ("com.example.timejob.MyService".equals(service.service.getClassName())) {
                return true;
            }
        }
        return false;
    }
}

2:MyService.java

public class MyService extends Service{
    public  Timer timer = null;
    public String info = null;

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        doJob();

        return super.onStartCommand(intent, flags, startId);
    }

    private  void doJob(){
        timer = new Timer();
        //10s触发一次
        timer.schedule(new MyTimerWork(),0, 1000*10);
    }

    private class MyTimerWork extends TimerTask{
        @Override
        public void run() {
            info = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
            Intent intent = new Intent();
            intent.setAction("com.example.timejob.service");
            intent.putExtra("data", info);
            sendBroadcast(intent);
            Log.d("MyTimerWork:", "定时任务执行:"+info);
        }
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if(null!=timer){
           timer.cancel();
        }
    }
}

3:AndroidManifest.xml

 <service
            android:name="com.example.timejob.MyService"
            android:enabled="true"
            android:exported="false" />