为什么ImageView的SystemClock.sleep之前不能更新() [英] why ImageView can't update before SystemClock.sleep()
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问题描述
我要显示在ImageView的其他图像在3个第二,翻转旧图片后。在code:
I want to show other image in ImageView within 3 second, after that rollover old image. The code:
OnClickListener oc = new OnClickListener() {
@Override
public void onClick(View v) {
ImageView iv = (ImageView)v;
iv.setImageResource(img2_id);
SystemClock.sleep(3000);
iv.setImageResource(img1_id);
}
}
myImageView.setOnClickListener(oc);
但它不工作?所以,我做错了什么?
But it doesn't work? So, am I doing something wrong?
推荐答案
正在阻塞UI线程。因此,睡眠命令时,屏幕不会刷新。你需要的是安排给一个函数,它改变了图像资源非阻塞延迟通话。以下是修改code,会做这样的事情:
You are blocking the UI thread. Thus during the sleep command, the screen won't refresh. What you need is to schedule a non-blocking delayed call to a function which changes image resource. Here is a modified code that would do such a thing:
Handler mHandler = new Handler(); /*handler declared in your Activity thread, I assume*/
OnClickListener oc = new OnClickListener() {
@Override
public void onClick(View v) {
ImageView iv = (ImageView)v;
iv.setImageResource(img2_id);
mHandler.postDelayed(new Runnable(){
public void Run(){
iv.setImageResource(img1_id);
}
},3000);
}
}
myImageView.setOnClickListener(oc);
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