打开导航抽屉时使片段可点击

Question

我的问题如下：我在平板电脑的横向模式下锁定了导航抽屉菜单setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_OPEN)，但我需要右侧的片段处于活动状态，所以我总是可以用导航点击它打开。但我不知道该怎么做。请帮忙。

Answer 1

这是一个棘手的问题。当抽屉打开时，它会拦截触发抽屉关闭的触摸事件。为了防止这种情况，您需要将 DrawerLayout 子类化并覆盖 onInterceptTouchEvent 方法：

public class CustomDrawerLayout extends DrawerLayout
{
    private View rightView;
    private int mTouchSlop;

    public CustomDrawerLayout (Context context)
    {
        this(context, null);
    }

    public CustomDrawerLayout (Context context, AttributeSet attrs)
    {
        this(context, attrs, 0);
    }

    public CustomDrawerLayout (Context context, AttributeSet attrs, int defStyle)
    {
        super(context, attrs, defStyle);
        mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(ViewConfiguration.get(context));
    }

    public void setRightView (View v)
    {
        this.rightView = v;
    }

    @Override
    public boolean onInterceptTouchEvent (MotionEvent ev)
    {
        boolean result = super.onInterceptTouchEvent(ev);

        if (rightView != null && isDrawerOpen(rightView))
        {
            DrawerLayout.LayoutParams layoutParams = (DrawerLayout.LayoutParams) rightView.getLayoutParams();

            if (layoutParams.gravity == Gravity.END)
            {
                // This is true when the position.x of the event is happening on the left of the drawer (with gravity END)
                if (ev.getX() < rightView.getX() && ev.getX() > mTouchSlop)
                {
                    result = false;
                }
            }
        }

        return result;
    }
}

这是我使用右抽屉的代码。我相信你可以为你的左边抽屉改编这个。您可能还想禁用阴影：

mDrawerLayout.setScrimColor(Color.TRANSPARENT);

Answer 2

您需要做几件事：

通过设置透明颜色禁用布局淡化：
```
drawer.setScrimColor(Color.TRANSPARENT);
```

锁上抽屉

drawer.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_OPEN);

创建自定义抽屉class，在锁定模式下允许点击：

public class CustomDrawer extends DrawerLayout {

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

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

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

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        View drawer = getChildAt(1);

        if (getDrawerLockMode(drawer) == LOCK_MODE_LOCKED_OPEN && ev.getRawX() > drawer.getWidth()) {
            return false;
        } else {
            return super.onInterceptTouchEvent(ev);
        }
    }

}

在xml中使用这个class：

<com.example.myapplication.CustomDrawer
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <!-- The main content view -->
    </FrameLayout>
    <ListView android:layout_width="100dp"
              android:layout_height="match_parent"
              android:layout_gravity="start"
              android:background="#111"/>
</com.example.myapplication.CustomDrawer>

打开导航抽屉时使片段可点击

Make fragment clickable when navigation drawer is opened

android

android-fragments

navigation-drawer