1.准备工作

    implementation'com.youth.banner:banner:1.4.10' //图片轮播
    implementation'tv.danmaku.ijk.media:ijkplayer-java:0.8.8' //视频播放器
    implementation'tv.danmaku.ijk.media:ijkplayer-armv7a:0.8.8'

2.代码

public class ScreenSaverActivity extends AppCompatActivity {
    private final String TAG_NAME = "ScreenSaverActivity: %s";
    private SurfaceView surfaceView;
    private IjkMediaPlayer mPlayer;
    private Banner banner;
    private ArrayList<String> screenSaverResource = new ArrayList<>();
    {
        /** 网络资源测试**/
//        screenSaverResource.add("http://vd3.bdstatic.com/mda-jinpn2ghm53htxvb/sc/mda-jinpn2ghm53htxvb.mp4");
//        screenSaverResource.add("http://vd2.bdstatic.com/mda-jhffxctu0n1tvhhd/sc/mda-jhffxctu0n1tvhhd.mp4");
    }
    private SurfaceHolder.Callback callback = new SurfaceHolder.Callback() {
        @Override
        public void surfaceCreated(SurfaceHolder holder) {
            createPlayer();

            mPlayer.setDisplay(surfaceView.getHolder());
        }

        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

        }

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
            if (surfaceView != null) {
                surfaceView.getHolder().removeCallback(callback);
                surfaceView = null;
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);//remove title bar  即隐藏标题栏
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_screen_saver);

        surfaceView = findViewById(R.id.surface_view);
        banner = findViewById(R.id.banner);
        init();
    }

    private void init() {

        //获取本地屏保资源
        Resource resource = Resource.getResource(this);
        screenSaverResource = resource.getScreenSaverImgResource();
        if (screenSaverResource == null || screenSaverResource.isEmpty()) {
            return;
        }

        //判断是否是视频资源
        if (screenSaverResource.get(0).contains(".mp4") || screenSaverResource.get(0).contains(".MP4")) {
            banner.setVisibility(View.GONE);
            surfaceView.getHolder().addCallback(callback);
        } else {

            surfaceView.setVisibility(View.GONE);

            //设置图片加载器
            banner.setImageLoader(new GlideImageLoader());
            banner.setImages(screenSaverResource);
            banner.setDelayTime(15 * 1000);

            //banner设置方法全部调用完毕时最后调用
            banner.start();
        }
    }


    public class GlideImageLoader extends ImageLoader {
        @Override
        public void displayImage(Context context, Object path, ImageView imageView) {
            Glide.with(context).load(path).apply(new RequestOptions().diskCacheStrategy(DiskCacheStrategy.NONE)).into(imageView);
        }
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        this.finish();
        return super.dispatchTouchEvent(ev);
    }


    private void switchResources() {
        mPlayer.reset();
        try {

            String resource = screenSaverResource.get(0);
            screenSaverResource.remove(0);
            screenSaverResource.add(resource);
            adaptionLayout(resource);
            mPlayer.setDataSource(this, Uri.parse(resource));
        } catch (IOException e) {
            Logger.e(TAG_NAME, "屏保文件解析错误：" + e.getMessage());
            e.printStackTrace();
        }
        mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
        mPlayer.prepareAsync();
        mPlayer.setDisplay(surfaceView.getHolder());
    }


    /***********************************************************************************************
     * 创建视频播放器
     **********************************************************************************************/
    private void createPlayer() {
        if (mPlayer == null) {
            mPlayer = new IjkMediaPlayer();
            IjkMediaPlayer.loadLibrariesOnce(null);
            IjkMediaPlayer.native_profileBegin("libijkplayer.so");
            mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            try {
                String resource = screenSaverResource.get(screenSaverResource.size() - 1);
                adaptionLayout(resource);
                mPlayer.setDataSource(this, Uri.parse(resource));

            } catch (IOException e) {
                Logger.e(TAG_NAME, "屏保文件解析错误：" + e.getMessage());
                e.printStackTrace();
            }
            mPlayer.prepareAsync();
            mPlayer.setOnCompletionListener(new IMediaPlayer.OnCompletionListener() {
                @Override
                public void onCompletion(IMediaPlayer iMediaPlayer) {
                    switchResources();
                }
            });
        }
    }

    /***********************************************************************************************
     * 释放视频播放器资源
     **********************************************************************************************/
    private void release() {
        if (mPlayer != null) {
            mPlayer.stop();
            mPlayer.release();
            mPlayer = null;
            IjkMediaPlayer.native_profileEnd();
        }
        
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        release();
    }

    /***********************************************************************************************
     * 视频自动适应布局
     * @param path 播放资源
     **********************************************************************************************/
    private void adaptionLayout(String path) {
        android.media.MediaMetadataRetriever mmr = new android.media.MediaMetadataRetriever();
        if (path == null) {
            return;
        }
        try {
            mmr.setDataSource(path);
            int width = Integer.parseInt(mmr.extractMetadata(android.media.MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH));//宽
            int height = Integer.parseInt(mmr.extractMetadata(android.media.MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT));//高

            //根据屏幕宽高设置1920*1080
            double againValue = Math.min(1920.0 / height, 1080.0 / width);
            surfaceView.getLayoutParams().width = (int) (width * againValue);
            surfaceView.getLayoutParams().height = (int) (height * againValue);
        } catch (Exception ex) {
            Logger.e(TAG_NAME, "屏保文件解析错误：" + ex.getMessage());
        } finally {
            mmr.release();
        }
    }
}

activity_screen_saver.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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/main_background"
    tools:context="com.xxx.activity.ScreenSaverActivity"
    android:gravity="center"
    tools:ignore="MissingDefaultResource">

    <SurfaceView
        android:id="@+id/surface_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"/>

    <com.xxx.util.Banner
        android:id="@+id/banner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />


</LinearLayout>

3.效果图
资源集合中第一个元素是mp3视频，就会执行视频轮播，如果不是mp3视频，就会当做图片轮廓，不支持混合轮播，不过稍微改动下也是可以支持的。

Screenshot from 2019-09-27 09:58:04.png

Screenshot from 2019-09-27 09:58:29.png

4.后记
banner的详细链接：https://github.com/youth5201314/banner