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                HandlerThread完美地解決了myLooper可能為空的問題。來看看它是怎么做的。代碼如下所示: **HandlerThread** ~~~ public class HandlerThread extends Thread{ //線程1調用getLooper來獲得新線程的Looper publicLooper getLooper() { ...... synchronized (this) { while (isAlive() && mLooper == null) { try { wait();//如果新線程還未創建Looper,則等待 } catch (InterruptedException e) { } } } return mLooper; } //線程2運行它的run函數,looper就是在run線程里創建的。 publicvoid run() { mTid = Process.myTid(); Looper.prepare(); //創建這個線程上的Looper synchronized (this) { mLooper = Looper.myLooper(); notifyAll();//通知取Looper的線程1,此時Looper已經創建好了。 } Process.setThreadPriority(mPriority); onLooperPrepared(); Looper.loop(); mTid = -1; } } ~~~ HandlerThread很簡單,小小的wait/ notifyAll就解決了我們的難題。為了避免重復發明輪子,我們還是多用HandlerThread類吧!
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