public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private Button btn = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = findViewById(R.id.btn);
HandlerThread t1 = new HandlerThread();
HandlerThread t2 = new HandlerThread();
t1.start();
t2.start();
try {
/**
* 等待 使子线程内的handler能够初始化完毕，避免 时序错误带来的 mHandler = null
*/
Thread.sleep();
} catch (InterruptedException e) {
}
t1.mHandler.sendMessage(new Message());
t2.mHandler.sendMessage(new Message());
// t1.stop();
// t2.stop();
}
static public class HandlerThread extends Thread{
public Handler mHandler;
@Override
public void run() {
Looper.prepare(); // 子线程无默认的 looper 需手动添加
mHandler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
Log.d(TAG, "handleMessage:---------------------------- "+Thread.currentThread().getName());
Log.d(TAG, "Thread ID-----------------------"+Thread.currentThread().getId());
}} ;
Looper.loop(); // 循环
};
}
}日志输出：
2018-11-08 14:09:44.411 6000-6022/com.example.admin.handlertest D/MainActivity: handleMessage:---------------------------- Thread-2
2018-11-08 14:09:44.411 6000-6023/com.example.admin.handlertest D/MainActivity: handleMessage:---------------------------- Thread-3
2018-11-08 14:09:44.411 6000-6023/com.example.admin.handlertest D/MainActivity: Thread ID-----------------------43152
2018-11-08 14:09:44.411 6000-6022/com.example.admin.handlertest D/MainActivity: Thread ID-----------------------43151