与HandlerThread通信的示例
我想从GUI线程设置一个HandlerThread。 然后一段时间后，当在GUI上点击一个button时，它运行callHello（），然后发送一个消息给驻留在asynchronouslogging“Hello World”的非GUI线程上的HelloLogger对象。 我已经尝试了一些东西，一些块无限期地，一些永远不会收到消息，等等等等。下面的代码是或多或less如我所知，请有人可以修改它的工作？
public class HandlerThreadExample { private MyHandlerThread mMyHandlerThread; private Looper mLooper; private Handler mHandler; public HandlerThreadExample(){ mMyHandlerThread = new MyHandlerThread(); mMyHandlerThread.start(); mLooper = mMyHandlerThread.getLooper(); } public void callHello() { mHandler.sendEmptyMessage(1); } private class MyHandlerThread extends HandlerThread { private HelloLogger mHelloLogger; private Handler mHandler; public MyHandlerThread() { super("The MyHandlerThread thread", HandlerThread.NORM_PRIORITY); } public void run (){ mHelloLogger = new HelloLogger(); mHandler = new Handler(getLooper()){ public void handleMessage(Message msg){ mHelloLogger.logHello(); } }; super.run(); } } private class HelloLogger { public HelloLogger (){ } public void logHello(){ Log.d("HandlerThreadExample", "Hello World"); } } } 最好的例子发现：
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至less现在我可以closures该死的标签
解决scheme来自pskink的帮助
public class HandlerThreadExample2 { private static int MSG_START_HELLO = 0; private static int MSG_HELLO_COMPLETE = 1; private HandlerThread ht; private Handler mHtHandler; private Handler mUiHandler; private boolean helloReady = false; public HandlerThreadExample2(){ ht = new HandlerThread("The new thread"); ht.start(); Log.d(App.TAG, "UI: handler thread started"); mUiHandler = new Handler(){ public void handleMessage(Message msg){ if (msg.what == MSG_HELLO_COMPLETE){ Log.d(App.TAG, "UI Thread: received notification of sleep completed "); helloReady = true; } } }; mHtHandler = new Handler(ht.getLooper()){ public void handleMessage (Message msg){ if (msg.what == MSG_START_HELLO){ Log.d(App.TAG, "handleMessage " + msg.what + " in " + Thread.currentThread() + " now sleeping"); try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } Log.d(App.TAG, "Woke up, notifying UI thread..."); mUiHandler.sendEmptyMessage(MSG_HELLO_COMPLETE); } } }; } public void sendLongHello(){ if (helloReady){ Log.d(App.TAG, "sending hello " + Thread.currentThread()); mHtHandler.sendEmptyMessage(MSG_START_HELLO); helloReady = false; } else { Log.e(App.TAG, "Cannot do hello yet - not ready"); } } }
这是一个工作的例子：
HandlerThread ht = new HandlerThread("MySuperAwesomeHandlerThread"); ht.start(); Handler h = new Handler(ht.getLooper()) { public void handleMessage(Message msg) { Log.d(TAG, "handleMessage " + msg.what + " in " + Thread.currentThread()); }; }; for (int i = 0; i < 5; i++) { Log.d(TAG, "sending " + i + " in " + Thread.currentThread()); h.sendEmptyMessageDelayed(i, 3000 + i * 1000); }
更新 ：
创build两个类字段：
Handler mHtHandler; Handler mUiHandler;
并尝试这一点：
HandlerThread ht = new HandlerThread("MySuperAwsomeHandlerThread"); ht.start(); Callback callback = new Callback() { @Override public boolean handleMessage(Message msg) { if (msg.what == 0) { Log.d(TAG, "got a meaasage in " + Thread.currentThread() + ", now sleeping... "); try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } Log.d(TAG, "woke up, notifying ui thread..."); mUiHandler.sendEmptyMessage(1); } else if (msg.what == 1) { Log.d(TAG, "got a notification in " + Thread.currentThread()); } return false; } }; mHtHandler = new Handler(ht.getLooper(), callback); mUiHandler = new Handler(callback); mHtHandler.sendEmptyMessageDelayed(0, 3000);
你当然可以摆脱Callback界面，并用重写的handleMessage方法创build两个Handlers …
你看到的问题是因为你的外部类正在使用一个私有的mHandler字段，你的HandlerThread也是如此。 外部类'字段不被初始化。 你不需要内部的mHandler。 在调用start（）之后，外层类可以从你刚才抓住的钩子中创build一个处理函数。
