Android DrawerLayout - No drawer view found with gravity

问题:

When i'm click on my drawer toggle i'm get the following exception

java.lang.IllegalArgumentException: No drawer view found with gravity LEFT

This is my activity_drawer.xml

<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.DrawerLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/drawer_layout"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:fitsSystemWindows="true">      <LinearLayout         android:layout_width="match_parent"         android:layout_height="match_parent"         android:orientation="vertical">      <android.support.v7.widget.Toolbar         android:id="@+id/toolbar"         android:layout_height="wrap_content"         android:layout_width="match_parent"         android:minHeight="?attr/actionBarSize"         android:background="?attr/colorPrimary"/>      <FrameLayout         android:id="@+id/content"         android:layout_width="match_parent"         android:layout_height="match_parent"/>      <fragment         android:id="@+id/navigation"         android:layout_width="240dp"         android:layout_height="match_parent"         android:layout_gravity="start"         android:name="com.xyz.ui.navigation.NavigationFragment"         tools:layout="@layout/fragment_navigation" />      </LinearLayout> </android.support.v4.widget.DrawerLayout> 

My fragment_navigation.xml

<?xml version="1.0" encoding="utf-8"?> <ListView     xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:layout_gravity="start">  </ListView> 

And my list item

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical" android:layout_width="match_parent"     android:layout_height="match_parent">      <TextView         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:textAppearance="?android:attr/textAppearanceLarge"         android:text="Large Text"         android:id="@+id/navigation_item_text"         android:layout_gravity="center_horizontal" /> </LinearLayout> 

回答1:

From documentation

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.

<android.support.v4.widget.DrawerLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/drawer_layout"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:fitsSystemWindows="true">      <LinearLayout         android:layout_width="match_parent"         android:layout_height="match_parent"         android:orientation="vertical">      <android.support.v7.widget.Toolbar         android:id="@+id/toolbar"         android:layout_height="wrap_content"         android:layout_width="match_parent"         android:minHeight="?attr/actionBarSize"         android:background="?attr/colorPrimary"/>      <FrameLayout         android:id="@+id/content"         android:layout_width="match_parent"         android:layout_height="match_parent"/>      </LinearLayout>      <fragment         android:id="@+id/navigation"         android:layout_width="240dp"         android:layout_height="match_parent"         android:layout_gravity="right"         android:name="com.xyz.ui.navigation.NavigationFragment"         tools:layout="@layout/fragment_navigation" />  </android.support.v4.widget.DrawerLayout> 

回答2:

Ok. Let me make the things simple and clear here.
What is DrawerLayout?https://developer.android.com/reference/android/support/v4/widget/DrawerLayout.html

DrawerLayout Acts as a top-level container for window content that allows for interactive "drawer" views to be pulled out from the edge of the window. 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.

What is DrawerLayout?, In Simple words:

• The layout supported by Android that allows you to have an overlay screen, called as drawer, over your main screen.
• DrawerLayout needs childviews to work, similar to the LinearLayout and RelativeLayout.
• The childview must have either of the property set
  android:layout_gravity="start" OR android:layout_gravity="left"
• DrawerLayout uses this childView to know from where to start showing the Drawer i.e. From Left to Right or Right to Left. There are countries where the text is read from Right to Left.

Techie Stuff:

• EVENT#1: ActionBarDrawerToggle.java is set as the drawer listener for the DrawerLayout

     DrawerLayout mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);     ActionBarDrawerToggle mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,                 toolbar,R.string.navigation_drawer_open,                 R.string.navigation_drawer_close)                 mDrawerLayout.setDrawerListener(mDrawerToggle);     

EVENT#2: The user clicks on the Toolbar.navigationIcon that calls the toggle() function
ActionBarDrawerToggle.java (android-sdk\sources\android-22\android\support\v7\app\ActionBarDrawerToggle.java)

     private void toggle() {          if (mDrawerLayout.isDrawerVisible(GravityCompat.START)) {             mDrawerLayout.closeDrawer(GravityCompat.START);          } else {             mDrawerLayout.openDrawer(GravityCompat.START);          }      }      

Gravity.java (android-sdk\sources\android-22\android\view\Gravity.java)

/** Push object to x-axis position at the start of its container,     not changing its size.*/      public static final int START = RELATIVE_LAYOUT_DIRECTION | Gravity.LEFT;      

EVENT#3: Toggle() function calls the mDrawerLayout.openDrawer(Gravity.START)
DrawerLayout.java (support-v4-22.1.1.jar library)

     /*** Open the specified drawer by animating it out of view. **     @param gravity Gravity.LEFT to move the left drawer or Gravity.RIGHT     for the right. * GravityCompat.START or GravityCompat.END may also     be used. */      public void openDrawer(@EdgeGravity int gravity) {          final View drawerView = findDrawerWithGravity(gravity);          if (drawerView == null) {              throw new IllegalArgumentException("No drawer view found with gravity " +     gravityToString(gravity));          }         openDrawer(drawerView);      }     

EVENT#4: If no childView of the DrawerLayout is set with the layout_gravity="start” or left the No drawer view found with gravity LEFT is thrown.

Solution:

    <android.support.v4.widget.DrawerLayout         xmlns:android="http://schemas.android.com/apk/res/android"         xmlns:tools="http://schemas.android.com/tools"         android:id="@+id/drawer_layout"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:fitsSystemWindows="true">     <!--This will appear when the drawer is closed (default view)-->      <LinearLayout         android:layout_width="match_parent"         android:layout_height="match_parent"         android:orientation="vertical">          <android.support.v7.widget.Toolbar             android:id="@+id/toolbar"             android:layout_height="wrap_content"             android:layout_width="match_parent"             android:minHeight="?attr/actionBarSize"             android:background="?attr/colorPrimary" />      </LinearLayout>      <!-- This will appear when the drawer is opened -->     <!-- the property,android:layout_gravity, is used internally to identify imageView as the view to be displayed when the drawer is opened -->     <ImageView         android:id="@+id/imageView"         android:layout_width="match_parent"         android:layout_height=" match_parent"         android:layout_gravity="left"         android:background="@drawable/img_shree_ganesha" />       </android.support.v4.widget.DrawerLayout> I hope that helps. Happy Coding… 

回答3:

in my case, because DrawerLayout attr: tools:openDrawer="start" i added android:layout_gravity="start" for the second element

<?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"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/drawer_layout"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:fitsSystemWindows="true"     tools:openDrawer="start">      <firstElement         layout="@layout/app_bar_main"         android:layout_width="match_parent"         android:layout_height="match_parent" />      <secondElement         android:layout_gravity="start"         android:layout_width="match_parent"         android:layout_height="match_parent"         />  </android.support.v4.widget.DrawerLayout> 

回答4:

The "Android Drawer" needs to be a direct child node of the "DrawerLayout".

In your example above (re: original question example), you only have a single direct child node under "DrawerLayout" ("LinearLayout"), and no drawer view after it.

Move your drawer view out of your LinearLayout and place it after it.

回答5:

If you check more closely, you will notice that there are indeed two top level elements: LinearLayout and fragment.

回答6:

java.lang.IllegalArgumentException: No drawer view found with gravity LEFT

SOLUTION Assign a layout_gravity = "start" or "left" attribute to one of your DrawerLayout child view if your drawer layout already have a child view. OR Simply create a child view inside your DrawerLayout View and give it a layout_gravity = "start" or "left" attribute. for example

 <?xml version="1.0" encoding="utf-8"?>     <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"         xmlns:app="http://schemas.android.com/apk/res-auto"         xmlns:tools="http://schemas.android.com/tools"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:id="@+id/mDrawer_Layout"         tools:context="com.rad5.matdesign.MainActivity">          <android.support.design.widget.CoordinatorLayout             android:layout_width="match_parent"             android:layout_height="match_parent">              <android.support.v4.widget.DrawerLayout                 android:id="@+id/drawer_layout"                 android:layout_width="match_parent"                 android:layout_height="match_parent"                 android:fitsSystemWindows="true"                 tools:openDrawer="start">      <!-- Notice that here an image view as a child of the Drawer layout was -->     <!-- given a layout_gravity="start" -->                  <ImageView                     android:layout_width="match_parent"                     android:layout_height="wrap_content"                     android:layout_gravity="start"/>              </android.support.v4.widget.DrawerLayout>              <android.support.design.widget.AppBarLayout                 android:id="@+id/appBar"                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">                  <android.support.v7.widget.Toolbar                     android:id="@+id/toolbar"                     android:layout_width="match_parent"                     android:layout_height="?attr/actionBarSize"                     android:background="?attr/colorPrimary"/>                  <android.support.design.widget.TabLayout                     android:id="@+id/tabs"                     android:layout_width="match_parent"                     android:layout_height="wrap_content" />             </android.support.design.widget.AppBarLayout>              <android.support.v4.view.ViewPager                 android:id="@+id/viewpager"                 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.design.widget.NavigationView             android:id="@+id/nav_view"             android:layout_width="wrap_content"             android:layout_height="match_parent"             android:fitsSystemWindows="true"             app:headerLayout="@layout/nav_header"             app:menu="@menu/menu_navigation_items" />      </android.support.design.widget.CoordinatorLayout> 

文章来源: Android DrawerLayout - No drawer view found with gravity