在activity中启动service|在activity中启动service,通过Handler在service中打印1-99显示在acticity中在activity中启动service|通过Han

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360截图20190306173441255.jpg 1、首先注册service 通过start的方式启动service

/** * 测试通过startService启动service的执行情况 * * @author SuTongsheng * @create 2019/3/6 * @Describe */ public class StartService extends Service { private static final String TAG = "StartService"; @Nullable @Override public IBinder onBind(Intent intent) { return null; }@Override public void onCreate() { Log.e(TAG, "onCreate: "); super.onCreate(); }@Override public int onStartCommand(Intent intent, int flags, int startId) { Log.e(TAG, "onStartCommand: "); new MyThread().start(); return super.onStartCommand(intent, flags, startId); }@Override public void onDestroy() { Log.e(TAG, "onDestroy: "); super.onDestroy(); }private class MyThread extends Thread { @Override public void run() { for (int i = 0; i < 100; i++) { try { Thread.sleep(100); Message message = new Message(); message.what = i; ServiceActivity.serviceHandler.sendMessage(message); Log.i(TAG, "run: " + i); } catch (InterruptedException e) { e.printStackTrace(); }} super.run(); } }}

【在activity中启动service|在activity中启动service,通过Handler在service中打印1-99显示在acticity中】2、创建acitivity，其中点击按钮启动service并打印数字，StartService中通过引用ServiceActivity中的handler发送数字num。activity中通过Handler接收并显示在TextView上

private void initView() { serviceHandler = new ServiceHandler(); tv_show_service_num = this.findViewById(R.id.tv_show_service_num); this.findViewById(R.id.bt_start_service).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { startService(); } }); }public class ServiceHandler extends Handler{ @Override public void handleMessage(Message msg) { if (msg.what != 0) { int num = msg.what; tv_show_service_num.setText(num + ""); } super.handleMessage(msg); } }private void startService() { startIntent = new Intent(this, StartService.class); startService(startIntent); }