why view in drawerlayout is force scale to fill screen

Question

here is my test code:

Answer 1

The first child View of a DrawerLayout is the main content View, and it will be laid out to fill the DrawerLayout regardless of the layout attributes you set on it.

If you want your TextView to be the size you set, you need to wrap it in another ViewGroup that acts as the main content View. For example:

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="ro.rotry.NdInnerViewAutoFillScreen">

    <RelativeLayout android:id="@+id/content"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView android:text="in drawerlayout"
            android:textColor="@android:color/white"
            android:background="@android:color/black"
            android:layout_centerInParent="true"
            android:layout_width="100dp"
            android:layout_height="100dp"/>

    </RelativeLayout>

    <View android:id="@+id/drawer"
        ... />

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