android - 没有发现重力左侧的抽屉 View

Question

当我运行应用程序并单击工具栏图标时，我收到错误消息“未找到重力左侧的抽屉 View ”

这是我的xml文件

ma​​in.xml

<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/my_awesome_toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?attr/colorPrimary"
            android:minHeight="?attr/actionBarSize" />

        <android.support.v7.widget.RecyclerView
            android:id="@+id/book_list_rv_list"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scrollbars="vertical" />

        <ListView
            android:id="@+id/ListView1"
            android:layout_width="241dp"
            android:layout_height="match_parent"
            android:layout_gravity="start"
            android:background="#333"
            android:choiceMode="singleChoice"
            android:divider="#666"
            android:dividerHeight="1dp"
            android:paddingLeft="15sp"
            android:paddingRight="15sp" />
    </LinearLayout>

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

这个id是 Activity java文件的代码 fragment Activity 文件

Toolbar mToolbar = (Toolbar) findViewById(R.id.my_awesome_toolbar);
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);

        // drawer
        setSupportActionBar(mToolbar);
        mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
                mToolbar, R.string.app_name, R.string.app_name);
        mDrawerLayout.setDrawerListener(mDrawerToggle);

Answer 1

Content 和 Drawer 必须是 DrawerLayout 的两个子级。所以像这样改变你的布局:

<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/my_awesome_toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?attr/colorPrimary"
            android:minHeight="?attr/actionBarSize" />

        <android.support.v7.widget.RecyclerView
            android:id="@+id/book_list_rv_list"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scrollbars="vertical" />

    </LinearLayout>

    <ListView
        android:id="@+id/ListView1"
        android:layout_width="241dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="#333"
        android:choiceMode="singleChoice"
        android:divider="#666"
        android:dividerHeight="1dp"
        android:paddingLeft="15sp"
        android:paddingRight="15sp" />

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