Question

您好我试图在Android中模拟工作线程进行测试。该活动有一个按钮，通过工作线程调用notify（），我希望它在bucle的10次迭代后进入休眠状态。

这是我的代码和错误的堆栈跟踪。我该如何解决？感谢

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);


    t= new Thread(){
        public void run(){
            int i=0;
            while(true){


                if (i%10==9){
                    //Simulated end of data until notified again
                    try {
                        this.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            Log.d("Test",""+i);
            SystemClock.sleep(1000);
            } 
        }
    };
    t.start();


    findViewById(R.id.button1).setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            t.notify();

        }
    });
}





08-06 05:39:45.320: ERROR/AndroidRuntime(4480): FATAL EXCEPTION: main
08-06 05:39:45.320: ERROR/AndroidRuntime(4480): java.lang.IllegalMonitorStateException: object not locked by thread before notify()
08-06 05:39:45.320: ERROR/AndroidRuntime(4480):     at java.lang.Object.notify(Native Method)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480):     at com.example.memorycrash.MemoryCrashTestActivity$2.onClick(MemoryCrashTestActivity.java:51)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480):     at android.view.View.performClick(View.java:2538)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480):     at android.view.View$PerformClick.run(View.java:9152)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480):     at android.os.Handler.handleCallback(Handler.java:587)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480):     at android.os.Handler.dispatchMessage(Handler.java:92)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480):     at android.os.Looper.loop(Looper.java:130)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480):     at android.app.ActivityThread.main(ActivityThread.java:3687)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480):     at java.lang.reflect.Method.invokeNative(Native Method)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480):     at java.lang.reflect.Method.invoke(Method.java:507)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

所以这是你的解决方案。答案已经在StackOverflow上了。

为了在一个对象上调用wait（），notify（）或notifyAll（），你必须首先拥有你想要调用方法的对象的监视器，所以在你运行的情况下，这将是如何你需要这样做：

Runnable runnable = new Runnable() {
    public void run() {
      // wait(); This call wouldn't work
      syncronized (this) {
        wait();  // This call will work
      }
    }
};

要通知可运行的，您还必须拥有监视器

// runnable.notifyAll(); this call will not work
syncronized (runnable) {
    runnable.notifyAll(); // this call will work
}

Android中的工作线程

1 个答案: