Navigation Drawer从右侧划出

Navigation Drawer从右侧划出

AndroidStudio自带模板中的demo，NavagationDrawer是从左往右出来的，用过Share微博第三方客户端，ta把Drawer设置成从右往左。

在stackoverflow上找到的答案。
链接http://stackoverflow.com/questions/18547277/how-to-set-navigation-drawer-to-be-opened-from-right-to-left

1.drawer在main.xml中要设置android:layout_gravity="right"，

Drawer positioning and layout is controlled using the android:layout_gravity attribute on child views corresponding to which side of the view you want the drawer to emerge from: left or right. (Or start/end on platform versions that support layout direction.)

To use a DrawerLayout, position your primary content view as the first child with a width and height of match_parent. Add drawers as child views after the main content view and set the layout_gravity appropriately. Drawers commonly use match_parent for height with a fixed width.

2.默认是从左向右划出的，如果希望从右向左，需要修改ActionBarDrawerToggle中option选择的函数

     drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
//        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
//                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);

    toggle = new ActionBarDrawerToggle(this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close) {

        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            if (item != null && item.getItemId() == android.R.id.home) {
                if (drawer.isDrawerOpen(Gravity.RIGHT)) {
                    drawer.closeDrawer(Gravity.RIGHT);
                } else {
                    drawer.openDrawer(Gravity.RIGHT);
                }
            }
            return false;
        }
    };

    drawer.setDrawerListener(toggle);
    toggle.syncState();

3.在Activity的onOptionsItemSelected中添加mDrawerToggle的调用

@Override  
public boolean onOptionsItemSelected(MenuItem item) {  
 // The action bar home/up action should open or close the drawer.  
 // ActionBarDrawerToggle will take care of this.  
if (mDrawerToggle.onOptionsItemSelected(item)) {  
        return true;  
}  

    return super.onOptionsItemSelected(item);  
}  

4.已经实现从右侧弹出NavagationDrawer了。但是点击menu三横按钮，页面崩溃了。

The error：IllegalArgumentException: No drawer view found with gravity LEFT

解决办法：

  toolbar.setNavigationOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            if (drawer.isDrawerOpen(Gravity.RIGHT)) {
                drawer.closeDrawer(Gravity.RIGHT);
            } else {
                drawer.openDrawer(Gravity.RIGHT);
            }
        }
    });