android-86-Can't create handler inside thread that has not called Looper.prepare()

以下是Android API中的一个典型的Looper thread实现：

//Handler不带参数的默认构造函数：new Handler()，实际上是通过Looper.myLooper()来获取当前线程中的消息循环,
//而默认情况下，线程是没有消息循环的，所以要调用 Looper.prepare()来给线程创建消息循环，然后再通过，Looper.loop()来使消息循环起作用。

class LooperThread extends Thread
{
public Handler mHandler;
public void run()
{
Looper.prepare();
mHandler = new Handler()
{
public void handleMessage(Message msg)
{
// process incoming messages here
}
};
Looper.loop();
}

另，Activity的MainUI线程默认是有消息队列的。所以在Activity中新建Handler时，不需要先调用Looper.prepare()。

http://blog.163.com/[email protected]/blog/static/168747811201162041044112/

android-86-Can't create handler inside thread that has not called Looper.prepare()

时间： 2024-10-06 09:03:03

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