public class MainActivity extends Activity {
        private DemoPresentation mPresentation;
        private Display[]        displays;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            DisplayManager mDisplayManager = (DisplayManager) getSystemService(Context.DISPLAY_SERVICE);
            displays = mDisplayManager.getDisplays();
            mPresentation = new DemoPresentation(MainActivity.this, displays[1], getAssets());//displays[1]是副屏
                    mPresentation.show();
        }
    }


    public class DemoPresentation extends Presentation {
        private AssetManager assets = null;
        public DemoPresentation(Context outerContext, Display display, AssetManager manager) {
            super(outerContext, display);
            assets = manager;
        }
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            Resources r = getContext().getResources();
            setContentView(R.layout.main);
        }
        private String[] getImages() {
            String[] tempImages = null;
            try {
                if (null != assets) {
                    tempImages = assets.list("");
                }
            } catch (Exception e) {
            } finally {
                return tempImages;
            }
        }
    }