Android：如何自动刷新UI上的元素（无需刷新整个屏幕）

I want to refresh my tile after clicking on a Download all button. I m using GridAdapter to display a grids for multiple videos. So If i click on Download all Button tile grid should show a progress bar, But currently it is not showing without refreshing the entire page.

单击“全部下载”按钮后,我想刷新我的磁贴。我使用GridAdapter显示多个视频的网格。因此,如果我点击下载所有按钮磁贴网格应显示进度条,但目前它没有显示没有刷新整个页面。

We have tried below mentioned code on button click event but application getting crashed.....

我们在按钮点击事件上尝试了下面提到的代码但应用程序崩溃了.....

handler = new Handler();
handler.postDelayed(new Runnable() {
    @Override
    public void run() {
        //Do something after 100ms
        File tempfile = new File(mContext.getExternalFilesDir(course_name),productCode);
        if(tempfile.exists()){
            viewHolder.mProgressBar.setVisibility(View.VISIBLE);
            iewHolder.mImageView.setVisibility(View.INVISIBLE);
        }else{
            File tempthumbfile = new File(mContext.getExternalFilesDir(course_name),fname);
            Log.d("tempthumbfile-->",""+tempthumbfile);
            if(tempthumbfile.exists()){
                viewHolder.mImageView.setBackgroundDrawable(Drawable.createFromPath(new File(mContext.getExternalFilesDir(course_name),fname).getAbsolutePath()));
            }
            viewHolder.mProgressBar.setVisibility(View.INVISIBLE);
            viewHolder.mImageView.setVisibility(View.VISIBLE);
        }
        handler.postDelayed(this, 2000);
    }
}, 1500);

2 个解决方案

#1

Your question is not very specific, but try the following two approaches:

您的问题不是很具体,但请尝试以下两种方法:

1) First and foremost, if you want to refresh a specific tile in your grid. Just call TileAdapter.notifyDataSetChanged();

1)首先,如果要刷新网格中的特定图块。只需调用TileAdapter.notifyDataSetChanged();

2) If you are trying to e.g. blur the entire Grid and show a loading bar on top of it. Find a reference to the View hosting the grid and call view.invalidate();

2)如果您正在尝试例如模糊整个网格并在其上显示加载栏。查找托管网格的View的引用并调用view.invalidate();

2 个解决方案

#1

更多相关文章

随机推荐