Android HandlerThread的用法
HandlerThread 继承自Thread,内部封装了Looper。
首先Handler和HandlerThread的主要区别是:Handler与Activity在同一个线程中,HandlerThread与Activity不在同一个线程,而是别外新的线程中(Handler中不能做耗时的操作)。
用法:
- import android.app.Activity;
- import android.os.Bundle;
- import android.os.Handler;
- import android.os.Handler.Callback;
- import android.os.HandlerThread;
- import android.os.Message;
- public class MainActivity extends Activity {
- HandlerThread handlerThread = new HandlerThread("test");
- Handler handler;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- System.out.println("cur_id="+Thread.currentThread().getId());
- handlerThread.start();
- System.out.println("handlerThread.id=" + handlerThread.getId());
- //post(runnable),只是直接运行了run(),run()内ThreadId与UIThread是一样的
- // handler = new Handler();
- //post(runnable),将runnable运行在handlerThread中,这是非UIThread的
- handler = new Handler(handlerThread.getLooper(), new Callback() {
- @Override
- public boolean handleMessage(Message msg) {
- System.out.println("receive message.whatA=" + msg.what);
- if (msg.what == 1) {
- return true;//不再向外层传递
- } else {
- return false; //外层的handleMessage() 继续执行
- }
- }
- }) {
- @Override
- public void handleMessage(Message msg) {
- // TODO Auto-generated method stub
- super.handleMessage(msg);
- System.out.println("receive message.whatB=" + msg.what);
- }
- };
- handler.post(new Runnable() {
- @Override
- public void run() {
- System.out.println("handler_post_cur_id="+Thread.currentThread().getId());
- handler.sendEmptyMessage(1);
- handler.sendEmptyMessage(2);
- }
- });
- }
- }
- 01-23 07:12:31.590: I/System.out(12386): cur_id=1
- 01-23 07:12:31.590: I/System.out(12386): handlerThread.id=1866
- 01-23 07:12:31.590: I/System.out(12386): handler_post_cur_id=1866
- 01-23 07:12:31.600: I/System.out(12386): receive message.whatA=1
- 01-23 07:12:31.600: I/System.out(12386): receive message.whatA=2
- 01-23 07:12:31.600: I/System.out(12386): receive message.whatB=2
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