如何让导航抽屉在android中打开1/3的屏幕？

Question

我有一个应用程序，其中我有一个带导航抽屉的列表视图，默认情况下我想让抽屉打开1/3的屏幕，当用户滑动时将完全打开。我该怎么做

Answer 1

值\ dimens.xml

    <resources>
   <!-- Default screen margins, per the Android Design guidelines. -->
   <dimen name="activity_horizontal_margin">16dp</dimen>
   <dimen name="activity_vertical_margin">16dp</dimen>
  <dimen name="navigation_drawer_width">250dp</dimen>

   </resorces>

在xml中定义navigationView

    <android.support.design.widget.NavigationView
    android:id="@+id/nav_view"
    android:layout_width="@dimen/navigation_drawer_width"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    android:fitsSystemWindows="true"
    app:headerLayout="@layout/nav_header_actual_home"
    app:menu="@menu/activity_actual_home_drawer" />

Answer 2

您可以获取显示的宽度并设置导航抽屉的宽度

Display display = this.getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int displayWidth = size.x;
int displayHeight = size.y;

设置抽屉宽度

ViewGroup.LayoutParams params = drawer.getLayoutParams()
params.width = displayWidth / 3; //calculates 1/3 of the screen width
drawer.setLayoutParams(params);