Android - Loading drawables without skipping frames

问题

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 Snippet:

<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 message:

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

Things I have looked at:

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

回答1:

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) {}
    }
}

来源：https://stackoverflow.com/questions/35107914/android-loading-drawables-without-skipping-frames

标签

android

xml

drawable