DrawerLayout 设置为滑动范围全盘

    public void setDrawerLeftEdgeSize(DrawerLayout drawerLayout, float displayWidthPercentage) {
        if (drawerLayout == null) return;
        try {
            // find ViewDragHelper and set it accessible
            Field leftDraggerField = drawerLayout.getClass().getDeclaredField("mLeftDragger");
            leftDraggerField.setAccessible(true);
            ViewDragHelper leftDragger = (ViewDragHelper) leftDraggerField.get(drawerLayout);
            // find edgesize and set is accessible
            Field edgeSizeField = leftDragger.getClass().getDeclaredField("mEdgeSize");
            edgeSizeField.setAccessible(true);
            int edgeSize = edgeSizeField.getInt(leftDragger);
            // set new edgesize
            // Point displaySize = new Point();
            DisplayMetrics dm = new DisplayMetrics();
            getWindowManager().getDefaultDisplay().getMetrics(dm);
            edgeSizeField.setInt(leftDragger, Math.max(edgeSize, (int) (dm.widthPixels * displayWidthPercentage)));
        } catch (Exception e) {
            // ignore
        }
    }