如何通過使用buttonStop停止可運行的Android

Question

我正在開發一個簡單的應用程序，其中按鈕背景會在一秒鐘後動態更改。我的應用程序名稱中有一個按鈕stopButtonBackgroundChanging，因爲我點擊按鈕它會停止更改按鈕背景，但在2秒後應用程序停止意外。「請在這方面幫助我，並在下面看到我的代碼可能會更好一些那什麼是我真正想要做的

UpdateRunnable updateRunnable; 
private Runnable mEndlessRunnable; 


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


      Button stopButtonBackgroundChanging = (Button)findViewById(R.id.buttonStop); 
      stopButtonBackgroundChanging.setOnClickListener(new OnClickListener() 
      { 

       public void onClick(View v) 
       { 
        //See implementation of stop() method at the end of the code 
        updateRunnable.stop(); 

       } 
      }); 


      mEndlessRunnable = (Runnable) new UpdateRunnable(new Handler(), new Button[] 
      { 

        (Button) findViewById(R.id.button1), 
        (Button) findViewById(R.id.button2), 
        (Button) findViewById(R.id.button3), 
        (Button) findViewById(R.id.button4), 

      }); 
      mEndlessRunnable.run(); 






     }// End of onCreate() 



    //Start of UpdateRunnable 
    private static class UpdateRunnable implements Runnable 
    { 

     private boolean myContinue = true; 


      private Random mRand = new Random(); 
      private Handler mHandler; 
      private Button[] mButtons; 

      private Button mCurButton; 
      private int mState; 

      public UpdateRunnable(Handler handler, Button[] buttons) 
      { 
       mHandler = handler; 
       mButtons = buttons; 
      } 

      public void run() 
      { 
       if(myContinue) 
       { 
        // select a button if one is not selected 
        if (mCurButton == null) 
        { 
         mCurButton = mButtons[mRand.nextInt(mButtons.length)]; 
        } 
        // check internal state, `0` means first bg change, `1` means last 
        switch (mState) 
        { 
        case 0: 
         mCurButton.setBackgroundResource(R.drawable.buttonyellow); 
         mState = 1; 
         break; 
        case 1: 
         mCurButton.setBackgroundResource(R.drawable.buttonblue); 
         // reset state and nullify so this continues endlessly 
         mState = 0; 
         mCurButton = null; 
         break; 
        } 

        mHandler.postDelayed(this, 1000); 

       } 




      }// End of run() 

      public void stop() 
      { 
      this.myContinue =false;  
      } 

     }//End of class UpdateRunnable 

Answer 1

我相信你會得到這個通過改變你的onClick工作：

public void onClick(View v) 
{ 
    //See implementation of stop() method at the end of the code 
    ((UpdateRunnable) mEndlessRunnable).stop(); 
}