Android-加载可绘制对象而不跳过框架 [英] Android - Loading drawables without skipping frames

问题描述

好的，所以我在活动中使用了可绘制的PNG(1200 x 1920，30kb)作为背景.我的XML代码的片段如下所示.我的问题是应用程序正在跳过帧并具有滞后的响应.谁能告诉我为什么会这样，或者是解决我的问题的好方法吗?我仍然希望能够将此PNG文件用作背景.谢谢

Okay, so I am using a drawable PNG (1200 x 1920, 30kb) as a background in an activity. A snippet of my XML code is shown below. My problem is the application is skipping frames and has lagged responses. Could anybody tell me why this is happening, or a good way to solve my problem? I still would like to be able to use this PNG file as the background. Thanks

XML代码段:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/MY_PNG_BACKGROUND"
    tools:context=".MainActivity">

Logcat消息:

I/Choreographer: Skipped 53 frames!  The application may be doing too much work on its main thread.

我看过的东西:

• Imageview跳帧(如果有人可以告诉我该怎么做，这可能对我有用XML，而不是Java中的编程语言)
• 导致跳过帧的背景图像

• Imageview skipped frames (This may work for me if someone can tell me how to do it in XML instead of programmatically in Java)
• background images causing frames to be skipped

推荐答案

在注释中感谢CommonsWare的帮助，我得以弄清楚这一点.我使用AsyncTask在后台在Java类中预加载了drawable.这是一个代码示例:

Thanks to some help from CommonsWare in the comments, I was able to figure this out. I pre-loaded the drawable in my java class in the background using AsyncTask. Here is a code example:

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //Calling the task to be done in the background, in this case loading the drawable
        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.my_drawable);
            //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.my_layout);
            layout.setBackgroundDrawable(loaded);
        }

        @Override
        protected void onPreExecute() {}

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

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