Android：一旦我以编程方式禁用scrollingviewbehavior，我无法再次启用它

Question

根据我的要求，当我打开drawerLayout那时我想禁用滚动行为，当我关闭drawerLayout然后我想启用它。我可以在打开drawerLayout时禁用滚动行为，但在关闭adrawerLayout时无法启用它。

下面是我为

DrawerLayout mdrawer_layout = (DrawerLayout) getParentFragment().getView().findViewById(R.id.drawer_layout); 
     mdrawer_layout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED); 
     mdrawer_layout.addDrawerListener(new DrawerLayout.DrawerListener() { 
      @Override 
      public void onDrawerSlide(View drawerView, float slideOffset) { 

      } 

      @Override 
      public void onDrawerOpened(View drawerView) { 
       Toolbar toolbar = (Toolbar) mActivity.findViewById(R.id.actionBar); 
       AppBarLayout appbar = (AppBarLayout) mActivity.findViewById(R.id.appBarLayout); 

       /*AppBarLayout.LayoutParams params = (AppBarLayout.LayoutParams) toolbar.getLayoutParams(); 
       params.setScrollFlags(0);*/ 

       CoordinatorLayout.LayoutParams appBarLayoutParams = (CoordinatorLayout.LayoutParams) appbar.getLayoutParams(); 
       appBarLayoutParams.setBehavior(null); 
       appbar.setLayoutParams(appBarLayoutParams); 
      } 

      @Override 
      public void onDrawerClosed(View drawerView) { 

       Toolbar toolbar = (Toolbar) mActivity.findViewById(R.id.actionBar); 
       AppBarLayout appbar = (AppBarLayout) mActivity.findViewById(R.id.appBarLayout); 
       FrameLayout frameContainer = (FrameLayout) mActivity.findViewById(R.id.frameContainer); 

       /*AppBarLayout.LayoutParams params = (AppBarLayout.LayoutParams) toolbar.getLayoutParams(); 
       params.setScrollFlags(params.SCROLL_FLAG_ENTER_ALWAYS); 
       toolbar.setLayoutParams(params);*/ 

       CoordinatorLayout.LayoutParams appBarLayoutParams = (CoordinatorLayout.LayoutParams) frameContainer.getLayoutParams(); 
       appBarLayoutParams.setBehavior(new AppBarLayout.ScrollingViewBehavior()); 
       frameContainer.setLayoutParams(appBarLayoutParams); 

       appBarLayoutParams = (CoordinatorLayout.LayoutParams) appbar.getLayoutParams(); 
       appBarLayoutParams.setBehavior(new AppBarLayout.ScrollingViewBehavior()); 
       appbar.setLayoutParams(appBarLayoutParams); 
      } 

      @Override 
      public void onDrawerStateChanged(int newState) { 

      } 
     }); 

代码和我的布局文件是如下。

<?xml version="1.0" encoding="utf-8"?> 

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:id="@+id/drawer_layout" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <android.support.design.widget.CoordinatorLayout 
     android:id="@+id/myCoordinator" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 

     <android.support.design.widget.AppBarLayout 
      android:id="@+id/appBarLayout" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"> 

      <include layout="@layout/toolbar" /> 

     </android.support.design.widget.AppBarLayout> 


     <FrameLayout 
      android:id="@+id/frameContainer" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      app:layout_behavior="@string/appbar_scrolling_view_behavior" /> 

    </android.support.design.widget.CoordinatorLayout> 



</android.support.v4.widget.DrawerLayout> 

Answer 1

锁定你可以这样做：

mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);

及解锁：

mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);