取消ProgressDialog并停止线程

Question

我有一个运行几次操作的线程,我想在用户取消时停止它ProgressDialog.

public void run() {

    //operation 1

    //operation 2

    //operation 3

    //operation 4
}

这个线程只运行一次,所以我无法实现一个循环来检查他的线程是否仍然在运行.

这是我的ProgressDialog:

//Wait dialog
m_dlgWaiting = ProgressDialog.show(m_ctxContext, 
                                    m_ctxContext.getText(R.string.app_name), 
                                    m_ctxContext.getText(R.string.msg_dlg_analyse_pic), 
                                    true, //indeterminate
                                    true,
                                    new OnCancelListener() {
                                        @Override
                                        public void onCancel(DialogInterface dialog) {
                                            m_bRunning = false;
                                        }
                                    });

由于我不知道如何停止线程,通过循环对线程的操作进行排序以查看它是否仍应该运行是否正确,还是有更好的方法？

public void run() {
    int op = 0;
    while(m_bRunning) {
       switch(op) {
          case 0 :
              //operation 1
              break;
          case 1 :
              //operation 2
              break;
          case 2 :
              //operation 3
              break;
          case 3 :
              //operation 4
              break;
       }
       op++;
    }
}

即使使用此解决方案,如果线程中的操作过多,则可能很难对操作进行排序.有没有更好的方法来实现这一目标？

Answer 1

使用回调或AsyncTask

http://developer.android.com/reference/android/os/AsyncTask.html

final AsyncTask<Void, Void, Void> task = new AsyncTask<Void, Void, Void>() {
        private ProgressDialog dialog;

        @Override
        protected void onPreExecute()
        {
            this.dialog = new ProgressDialog(context);
            this.dialog.setMessage("Loading...");
            this.dialog.setCancelable(true);
            this.dialog.setOnCancelListener(new DialogInterface.OnCancelListener()
            {
                @Override
                public void onCancel(DialogInterface dialog)
                {
                    // cancel AsyncTask
                    cancel(false);
                }
            });

            this.dialog.show();

        }

        @Override
        protected Void doInBackground(Void... params)
        {
            // do your stuff
            return null;
        }

        @Override
        protected void onPostExecute(Void result)
        {
            //called on ui thread
            if (this.dialog != null) {
                this.dialog.dismiss();
            }
        }

        @Override
        protected void onCancelled()
        {
            //called on ui thread
            if (this.dialog != null) {
                this.dialog.dismiss();
            }
        }
};
task.execute();