全宽导航抽屉

Question

我想创建一个全宽导航抽屉.设置layout_width为match_parenton @+id/left_drawer的宽度约为屏幕空间的80%.这似乎是标准行为.我一定要重写onMeasure()的DrawerLayout？

我目前的代码:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/black"
        android:id="@+id/mainFragmentContainer">
    </FrameLayout>

    <include
        android:id="@+id/left_drawer"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        layout="@layout/drawer"/>
</android.support.v4.widget.DrawerLayout>

谢谢.

Answer 1

如果您想要更简单的解决方案,您可以设置负余量

android:layout_marginLeft="-64dp"

为你的左撇子:

<include
        android:id="@+id/left_drawer"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        layout="@layout/drawer"
        android:layout_marginLeft="-64dp"/>

Answer 2

是的,你必须扩展DrawerLayout和覆盖一些方法,因为MIN_DRAWER_MARGIN是private

这是一个可能的解决方案:

public class FullDrawerLayout extends DrawerLayout {

    private static final int MIN_DRAWER_MARGIN = 0; // dp

    public FullDrawerLayout(Context context) {
        super(context);
    }

    public FullDrawerLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public FullDrawerLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
        final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
        final int widthSize = MeasureSpec.getSize(widthMeasureSpec);
        final int heightSize = MeasureSpec.getSize(heightMeasureSpec);

        if (widthMode != MeasureSpec.EXACTLY || heightMode != MeasureSpec.EXACTLY) {
            throw new IllegalArgumentException(
                    "DrawerLayout must be measured with MeasureSpec.EXACTLY.");
        }

        setMeasuredDimension(widthSize, heightSize);

        // Gravity value for each drawer we've seen. Only one of each permitted.
        int foundDrawers = 0;
        final int childCount = getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = getChildAt(i);

            if (child.getVisibility() == GONE) {
                continue;
            }

            final LayoutParams lp = (LayoutParams) child.getLayoutParams();

            if (isContentView(child)) {
                // Content views get measured at exactly the layout's size.
                final int contentWidthSpec = MeasureSpec.makeMeasureSpec(
                        widthSize - lp.leftMargin - lp.rightMargin, MeasureSpec.EXACTLY);
                final int contentHeightSpec = MeasureSpec.makeMeasureSpec(
                        heightSize - lp.topMargin - lp.bottomMargin, MeasureSpec.EXACTLY);
                child.measure(contentWidthSpec, contentHeightSpec);
            } else if (isDrawerView(child)) {
                final int childGravity =
                        getDrawerViewGravity(child) & Gravity.HORIZONTAL_GRAVITY_MASK;
                if ((foundDrawers & childGravity) != 0) {
                    throw new IllegalStateException("Child drawer has absolute gravity " +
                            gravityToString(childGravity) + " but this already has a " +
                            "drawer view along that edge");
                }
                final int drawerWidthSpec = getChildMeasureSpec(widthMeasureSpec,
                        MIN_DRAWER_MARGIN + lp.leftMargin + lp.rightMargin,
                        lp.width);
                final int drawerHeightSpec = getChildMeasureSpec(heightMeasureSpec,
                        lp.topMargin + lp.bottomMargin,
                        lp.height);
                child.measure(drawerWidthSpec, drawerHeightSpec);
            } else {
                throw new IllegalStateException("Child " + child + " at index " + i +
                        " does not have a valid layout_gravity - must be Gravity.LEFT, " +
                        "Gravity.RIGHT or Gravity.NO_GRAVITY");
            }
        }
    }

    boolean isContentView(View child) {
        return ((LayoutParams) child.getLayoutParams()).gravity == Gravity.NO_GRAVITY;
    }

    boolean isDrawerView(View child) {
        final int gravity = ((LayoutParams) child.getLayoutParams()).gravity;
        final int absGravity = Gravity.getAbsoluteGravity(gravity,
                child.getLayoutDirection());
        return (absGravity & (Gravity.LEFT | Gravity.RIGHT)) != 0;
    }

    int getDrawerViewGravity(View drawerView) {
        final int gravity = ((LayoutParams) drawerView.getLayoutParams()).gravity;
        return Gravity.getAbsoluteGravity(gravity, drawerView.getLayoutDirection());
    }

    static String gravityToString(int gravity) {
        if ((gravity & Gravity.LEFT) == Gravity.LEFT) {
            return "LEFT";
        }
        if ((gravity & Gravity.RIGHT) == Gravity.RIGHT) {
            return "RIGHT";
        }
        return Integer.toHexString(gravity);
    }

}

Answer 3

因为所有这些答案都不能在OS 6.0.1上运行,所以我将在这里发布与DrawerLayout+ 结合使用的解决方案NavigationView.

所以我所做的就是以NavigationView编程方式改变宽度:

mNavigationView = (NavigationView) findViewById(R.id.nv_navigation);
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
DrawerLayout.LayoutParams params = (DrawerLayout.LayoutParams) mNavigationView.getLayoutParams();
params.width = metrics.widthPixels;
mNavigationView.setLayoutParams(params);

这适用于所有屏幕尺寸.

Answer 4

根据罗伯特的答案,您可以layout_marginLeft=-64dp轻松地使用它来解决这个问题.

然而,它似乎不再适用于Android 5.0及更高版本.所以这是我的解决方案,对我有用.

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
    android:id="@+id/drawer_layout"
    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:layout_marginRight="-64dp"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

    <include
        layout="@layout/content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginRight="64dp"/>

    <include
        android:id="@+id/left_drawer"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        layout="@layout/drawer"/>

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

基本上,添加android:layout_marginRight="-64dp"到根,DrawerLayout所以所有布局将向右移动64dp.

然后我添加layout_marginRight=64dp到内容,以便它回到原始位置.然后你可以在那里有一个完整的抽屉.

Answer 5

Grogory解决方案的变体:

在获取对抽屉布局的引用后,我立即调用以下实用程序方法而不是子类化:

/**
 * The specs tell that
 * <ol>
 * <li>Navigation Drawer should be at most 5*56dp wide on phones and 5*64dp wide on tablets.</li>
 * <li>Navigation Drawer should have right margin of 56dp on phones and 64dp on tablets.</li>
 * </ol>
 * yet the minimum margin is hardcoded to be 64dp instead of 56dp. This fixes it.
 */
public static void fixMinDrawerMargin(DrawerLayout drawerLayout) {
  try {
    Field f = DrawerLayout.class.getDeclaredField("mMinDrawerMargin");
    f.setAccessible(true);
    f.set(drawerLayout, 0);

    drawerLayout.requestLayout();
  } catch (Exception e) {
    e.printStackTrace();
  }
}