线程中的synchronized使用

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private static class ListenerHandlerThread implements Runnable {

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private Looper looper;

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private byte[] listenerKey = new byte[0];

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public ListenerHandlerThread() {

new Thread(this).start();

synchronized (listenerKey) {

while (looper == null) { ?//注意while必须放synronized里面，不然会出错

try {

listenerKey.wait();

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

}

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public Looper getLooper() {

return looper;

}

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@Override

public void run() {

Looper.prepare();

looper = Looper.myLooper();

synchronized (listenerKey) {

listenerKey.notifyAll();

}

Looper.loop();

}

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}