Android中的工作线程

您好，我试图模拟Android中的工作线程进行测试。该活动有一个按钮，该按钮通过工作线程调用notify（），并且我希望它在经过10次迭代后进入休眠状态。Android中的工作线程

这就是我的代码和错误的堆栈跟踪。我该如何解决它？谢谢

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)

来源

2011-08-06 Addev

所以这里是你的解决方案。答案已经在StackOverflow上。

为了在一个对象上调用wait（），notify（）或notifyAll（），你必须先拥有你想调用该方法的对象的监视器，所以在你的情况下，如何你需要做到这一点：

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

要通知可运行你也必须有监视器

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

来源

2011-08-06 05:04:50

Android中的工作线程

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