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

        FrameLayout bottomSheet = (FrameLayout) findViewById(R.id.content_layout);
        mBehavior = BottomSheetBehavior.from(bottomSheet);
        mBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);

        mImage = (ImageView) findViewById(R.id.media_result);
        mImage.setOnClickListener(this);
    }
Default UI Activity for simplest usage, containing layout achieve {@link BottomSheetBehavior}.
Only support SINGLE_IMG and VIDEO Mode.

@author ChenSL
boxing-impl/src/main/java/com/bilibili/boxing_impl/ui/BoxingBottomSheetActivity.java