android使用处理程序延迟 [英] android delay using handler

问题描述

我想显示几个图像，并在每个图像之间添加一个延迟. 我这样做了，代码中没有错误，但是由于某种原因，应用程序崩溃了.

I want to display a couple of images and add a delay between each image. I did this and have no errors in the code but for some reason the app crashes.

Bitmap bitmap = BitmapFactory.decodeFile(imageIn);
    ImageView myImageView = (ImageView)findViewById(R.id.imageview);
    myImageView.setImageBitmap(bitmap);
    // Those are the only 2 lines I used to make my handler 
    Handler handlerTimer = new Handler();
    handlerTimer.postDelayed((Runnable) this, 20000);

推荐答案

您没有说哪个类托管着您发布的摘录，但我认为handlerTimer.postDelayed((Runnable) this, 20000);不太可能是正确的.

You don't say what class hosts the snippet you posted, but I think handlerTimer.postDelayed((Runnable) this, 20000); is unlikely to be right.

尝试添加匿名Runnable对象，例如

Try adding an anonymous Runnable object such as

    handlerTimer.postDelayed(new Runnable(){
        public void run() {
          // do something             
      }}, 20000);

另一方面，logcat输出对于了解导致崩溃的线索非常有用. http://developer.android.com/guide/developing/tools/logcat.html

Another thing, logcat output is invaluable for getting clues about what is causing a crash. http://developer.android.com/guide/developing/tools/logcat.html

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