android - 导致延迟和跳帧的背景图像

Question

我有一个简单的布局，我想要一个背景图像。首先，我尝试通过 xml 放置背景图像，但延迟很大。

所以我关注了Set image through AsyncTask但仍然没有运气。

图片分辨率为 1131 X 1800，大小为 369kb。

I/Choreographer: Skipped 33 frames!  The application may be doing too much work on its main thread.
I/Choreographer: Skipped 37 frames!  The application may be doing too much work on its main thread.
I/Choreographer: Skipped 34 frames!  The application may be doing too much work on its main thread.
I/Choreographer: Skipped 34 frames!  The application may be doing too much work on its main thread.
I/Choreographer: Skipped 34 frames!  The application may be doing too much work on its main thread.

Java文件

public class MainActivity extends flights{
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    new LoadDrawable().execute();
}

private class LoadDrawable extends AsyncTask<Drawable, Void, Drawable> {
    @Override
    protected Drawable doInBackground(Drawable... params) {
        //Loading the drawable in the background
        final Drawable image = getResources().getDrawable(R.drawable.as);
        //After the drawable is loaded, onPostExecute is called
        return image;
    }

    @Override
    protected void onPostExecute(Drawable loaded) {
        //Hide the progress bar
        //ProgressBar progress = (ProgressBar) findViewById(R.id.progress_bar);
        //progress.setVisibility(View.GONE);
        //Set the layout background with your loaded drawable
        RelativeLayout layout = (RelativeLayout) findViewById(R.id.root);
        layout.setBackgroundDrawable(loaded);
    }

    @Override
    protected void onPreExecute() {}

    @Override
    protected void onProgressUpdate(Void... values) {}
}

}

Answer 1

你的图片很大。将图像设置为背景的一个问题是图像大小而不适合分辨率。我有同样的问题。经过搜索和测试多种方法，我发现 glide 是一个很好的设置图像的库。使用这个库，你的设备大小并不重要。滑行将设置它。

对于从你的drawable中设置图像，你可以这样编码:

 Glide.with(this).load(R.drawable.backtwo).asBitmap().into(new SimpleTarget<Bitmap>(size.x, size.y) {
            @Override
            public void onResourceReady(Bitmap resource, GlideAnimation<? super Bitmap> glideAnimation) {
                Drawable drawable = new BitmapDrawable(resource);
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                    iv_background.setBackground(drawable);
                }
            }
        });

另一种方法是针对不同的设备屏幕使用不同的图像分辨率。这种方法的缺点是增加了 apk 的大小