Android for循环和延迟不同步

Question

简短摘要

我有一个 Activity 游戏。用户将点击图像:

用户有 5 秒的时间点击并选择正确的选项。 5 秒后，正确的 ImageView 将以不同的方式显示以引起注意，5 秒后，用户将再次看到下一个级别。

用户无需等待 5 秒即可点击，因此点击后应立即进入下一级别。

我正在动态创建 View 和 ImageView 。 ImageView 以字节形式从本地数据库 sqlite 中获取。

我的方法是在 oncreate 方法中创建。我使用 for 或 while 循环。每次迭代都是一个游戏级别。每个级别都有不同的 ImageView 和不同的 ImageView 数。

为了延迟 5 + 5 秒，我不得不使用处理程序、线程、倒计时计时器。每一个都造成了问题。

在使用处理程序时，当用户在 5 秒前单击时，我无法终止当前 session 。

不知道这样对不对

你可以在下面看到我的代码:

详细说明和代码

计时器:

nCreate() {
            for (int i = 0; i < 2; i++) {
                handler.postDelayed(new Runnable() {
                    public void run() {

                        imageAnswer.setImageBitmap(bmp);

                        imageAnswer.setId(R.id.imgAnswer);
                        //adding image to screen
                        finalRLayout.removeAllViews();
                        finalRLayout.addView(imageAnswer, rLayParams);

                        //starting timer, if no answer in 5 seconds, run again timer
                        startTimer();

                        //clicklisterner
                        imageAnswer.setOnClickListener(new View.OnClickListener() {
                            @Override
                            public void onClick(View view) {
                                //if clicks true, cancel timer and go to next iteration of for loop
                                if (view == findViewById(R.id.imgAnswer)) {
                                    Log.d(TAG, "clicked");
                                    //PUT IN CODE HERE TO GET NEXT IMAGE
                                    cancelTimer();

                                } else { //if not true, run again timer for last chance
                                    Log.d(TAG, "nonclick");
                                    cancelTimer();
                                    startTimer();

                                }
                            }
                        });
                    }
                }, 2000 * i);


            } //for end

        } //oncreate end

    //start timer function
    void startTimer() {
        cTimer = new CountDownTimer(5000, 1000) {
            public void onTick(long millisUntilFinished) {
                Log.d(TAG, "ontick");
            }
            public void onFinish() {
                Log.d(TAG, "timer onfinish");
            }
        };
        cTimer.start();
    }


    //cancel timer
    void cancelTimer() {
        Log.d(TAG, "canceltimer");
        if (cTimer != null)
            cTimer.cancel();
    }

3 个不同的线程操作但没有工作。其中一个使屏幕进入黑屏。另外两个没有阻止循环的进行。

runnable version






    for ( int i = 0; i< 20 ; i++) {
            Log.d(TAG, "for i2="+ i);
            final int finalI = i;
            final RelativeLayout finalRLayout = rLayout;



            final Runnable r=new Runnable() {

                @Override
                public void run() {
                    Log.d(TAG, "for finali2="+ finalI);
                    TrainingObject trainingObject = new TrainingObject();
                    trainingObject = trainingObjectList.get(finalI);
                    objectCount = 2;
//test icin
                    Log.d(TAG,"testicin trainingobjectid: "+trainingObject.getTrainingobjectID());
                    object = dbHandler.getObjectObject(trainingObject.getTrainingobjectAnswer());




                    RelativeLayout.LayoutParams rLayParams = new RelativeLayout.LayoutParams(140,140);

                    rLayParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
                    rLayParams.addRule(RelativeLayout.CENTER_IN_PARENT);

                    imgBytes = object.getObjectImageBlob();
                    bmp = BitmapFactory.decodeByteArray(imgBytes, 0, imgBytes.length);

                    imageAnswer.setImageBitmap(bmp);
                    imageAnswer.setTag(trainingObject.getTrainingobjectAnswer());
                    imageAnswer.setId(R.id.imgAnswer);
                    finalRLayout.removeAllViews();
                    finalRLayout.addView(imageAnswer,rLayParams);

                }
            };
            Log.d(TAG, "3000i2 sonrasi");

            handler.postDelayed(r, 6000 * i);
            imageAnswer.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    if (view == findViewById(R.id.imgAnswer)) {
                        Log.d(TAG, "clicked");handler.removeCallbacks(r); handler.postDelayed(r, 0);
                        //PUT IN CODE HERE TO GET NEXT IMAGE

                    }
                    else{
                        Log.d(TAG, "nonclick");
                        handler.removeCallbacks(r);  handler.postDelayed(r, 6000);

                    }
                }
            });

        }//for end

Answer 1

您可以简单地使用处理程序来实现您的目的，您应该做的是创建一个可运行的并在处理程序外部声明它，然后在 postDelayed 处理程序中通过它的名称使用它，如果用户点击，只需删除所有处理程序回调:

// first create runnable
Runnable r = new Runnable{
    public void run(){
         //do what you need to do after 5 seconds
    }
}

// then create handler
Handler mHandler = new Handler();

// then in your onCreate method
nCreate() {
        for (int i = 0; i < 2; i++) {
            handler.postDelayed(new Runnable() {
                public void run() {

                    imageAnswer.setImageBitmap(bmp);

                    imageAnswer.setId(R.id.imgAnswer);
                    //adding image to screen
                    finalRLayout.removeAllViews();
                    finalRLayout.addView(imageAnswer, rLayParams);

                    //starting handler, if no answer in 5 seconds, run again timer
                    mHandler.postDelayed(r, 5000);

                    //clicklisterner
                    imageAnswer.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            //if clicks true, cancel timer and go to next iteration of for loop
                            if (view == findViewById(R.id.imgAnswer)) {
                                Log.d(TAG, "clicked");
                                //PUT IN CODE HERE TO GET NEXT IMAGE
                                myHandler.removeCallbacks(r);

                            } else { //if not true, run again timer for last chance
                                Log.d(TAG, "nonclick");
                                // stop the handler
                                myHandler.removeCallbacks(r);
                                // run a new one
                                mHandler.postDelayed(r, 5000);

                            }
                        }
                    });
                }
            }, 2000 * i);


        } //for end

    } //oncreate end