安卓：更新UI的一个按钮？ [英] Android: Updating UI with a Button?

问题描述

所以我有一些简单的code，但它似乎没有工作..任何建议吗？

So I have some simple code but it seems to not be working.. any suggestions?

我只是想一个图像显示在一个按钮是pssed在2秒钟后成为无形$ P $。

I just want an image to show after a button is pressed then become invisible after 2 seconds.

button.setOnClickListener(new OnClickListener() {
   public void onClick(View v) {
      firstImage.setVisibility(ImageView.VISIBLE);
      // delay of some sort
      firstImage.setVisibility(ImageView.INVISIBLE);
   }
}

图片从未表明，它始终保持无形的，我应该以另一种方式来实现这一点？我试过处理..但它没有工作，除非我没有错。

The image never shows, it always stays invisible, should I be implementing this in another way? I've tried handlers.. but it didn't work, unless I did it wrong.

推荐答案

从不让你的UI线程睡眠！

Never make your UI thread sleep!

做到这一点：

final Handler handler = new Handler();

button.setOnClickListener(new OnClickListener() {
   public void onClick(View v) {
      firstImage.setVisibility(ImageView.VISIBLE);
      handler.postDelayed(new Runnable(){
            public void run(){
                 firstImage.setVisibility(ImageView.INVISIBLE);
            }
      }, DELAY);
   }
}

在这里您将延迟设置为2000（毫秒）。

Where you would set DELAY as 2000 (ms).

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