android-handlerthread - 处理线程实例在创建线程后变为空

Question

我在使用其处理程序线程实例退出线程时遇到空指针异常，实例值在创建后变为空。如果我将变量设为静态，那么我就不会遇到这个问题。谁能解释一下为什么 Handler 线程实例在创建后变为空，下面的代码将简要解释我的问题。

private class MyHandler extends Handler{

    private HandlerThread hThread;

    private MyHandler(Looper looper){
         super(looper);
    }

    public MyHandler(){

       //Created my handler thread instance here
       hThread = new HandlerThread(... , Process.THREAD_PRIORITY_BACKGROUND);
       hThrad.start();

       new MyHandler(hThread.getLooper);
    }

这是我的处理消息方法：

  public void HandlerMessage(Message msg){
        super(msg);
     try{


       /*Here I am executing some utility methods*/
     }catch(Exception exce){

     }finally{

         /*While reading the instance of Handler thread it says null*/
            hThread.quit();//Throws null pointer exception.

     }

    }
}