如何停止Handler Runnable？

问题描述

我在以下程序中使用处理程序，我想在i = 5时停止它，但处理程序不会停止并连续运行。

I am using a handler in the following program and I want to stop it when i=5 but the handler doesn't stop and run continuously.

   b1.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            handler = new Handler();
           runnable = new Runnable() {
                 public void run() {

                    try {
                        Toast.makeText(getApplicationContext(), "Handler is working", Toast.LENGTH_LONG).show();
                        System.out.print("Handler is working");

                       if(i==5){
                           //Thread.currentThread().interrupt();
                            handler.removeCallbacks(runnable);


                            System.out.print("ok");
                                        Toast.makeText(getApplicationContext(), "ok", Toast.LENGTH_LONG).show();
                        }
                       i++;
                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                   handler.postDelayed(this, 5000);

               }
           };
           handler.postDelayed(runnable, 5000);
           //return;
        }
    });

推荐答案

因为你打电话给 postDelayed（删除回拨后再次。请使用此代码：

Because you call postDelayed() again after removing call backs. Please use this code:

final Handler handler = new Handler();
final Runnable runnable = new Runnable() {
         public void run() {
               Log.d("Runnable","Handler is working");
               if(i == 5){ // just remove call backs
                    handler.removeCallbacks(this);
                    Log.d("Runnable","ok");
                } else { // post again
                    i++;
                    handler.postDelayed(this, 5000);
                }
       }
   };

//now somewhere in a method
 b1.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
        handler.removeCallbacks(runnable);
        handler.postDelayed(runnable, 5000);
    }
});

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