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
}
}