禁止用户在BottomSheet上拖动

问题描述

我正在尝试禁止用户拖动 BottomSheet 。我要禁用的原因有两点。 1.防止 ListView 向下滚动，2.我不希望用户通过拖动而退出，但要在 BottomSheetView 上使用按钮code>。这就是我所做的

I am trying to disable user dragging on BottomSheet. The reason I want to disable is two things. 1. It's preventing the ListView from scrolling downward, 2. I don't want users to dismiss using dragging but with a button on the BottomSheetView. This is what I've done

 bottomSheetBehavior = BottomSheetBehavior.from(bottomAnc);
    bottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
        @Override
        public void onStateChanged(@NonNull View bottomSheet, int newState) {
            if (newState == BottomSheetBehavior.STATE_EXPANDED) {
                //Log.e("BottomSheet", "Expanded");
            } else if (newState == BottomSheetBehavior.STATE_COLLAPSED) {
                //Log.e("BottomSheet", "Collapsed");
            }
        }

        @Override
        public void onSlide(@NonNull View bottomSheet, float slideOffset) {
            // React to dragging events
            bottomSheet.setOnTouchListener(new View.OnTouchListener() {
                @Override
                public boolean onTouch(View v, MotionEvent event) {
                    int action = MotionEventCompat.getActionMasked(event);
                    switch (action) {
                        case MotionEvent.ACTION_DOWN:
                            return false;
                        default:
                            return true;
                    }
                }
            });
        }
    });

bottomSheetLayout

The bottomSheetLayout

    <?xml version="1.0" encoding="utf-8"?><FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white"
app:behavior_hideable="true"
app:behavior_peekHeight="0dp"
app:layout_behavior="@string/bottom_sheet_behavior"
android:id="@+id/bottomSheet">

<android.support.v7.widget.CardView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:elevation="10dp">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:gravity="center_vertical">

            <TextView
                android:id="@+id/text1"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Order Items"
                android:layout_margin="16dp"
                android:textAppearance="@android:style/TextAppearance.Large"/>


            <Button
                android:layout_width="50dp"
                android:layout_height="wrap_content"
                android:layout_marginRight="5dp"
                android:background="@drawable/bg_accept"/>

            <Button
                android:layout_width="50dp"
                android:layout_height="wrap_content"
                android:layout_marginRight="8dp"
                android:background="@drawable/bg_cancel"/>

        </LinearLayout>

        <ListView
            android:id="@+id/item_edit"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@color/white"
            android:divider="@color/md_divider_black"
            android:dividerHeight="1dp"/>

    </LinearLayout>

</android.support.v7.widget.CardView>

推荐答案

现在可能不再相关，但我将其留在这里：

It can be now no longer relevant, but I will leave it here:

import android.content.Context
import android.util.AttributeSet
import androidx.coordinatorlayout.widget.CoordinatorLayout
import android.view.MotionEvent
import android.view.View
import com.google.android.material.bottomsheet.BottomSheetBehavior

@Suppress("unused")
class LockableBottomSheetBehavior<V : View> : BottomSheetBehavior<V> {
    constructor() : super()
    constructor(context: Context, attrs: AttributeSet) : super(context, attrs)

    var swipeEnabled = true

    override fun onInterceptTouchEvent(
        parent: CoordinatorLayout,
        child: V,
        event: MotionEvent
    ): Boolean {
        return if (swipeEnabled) {
            super.onInterceptTouchEvent(parent, child, event)
        } else {
            false
        }
    }

    override fun onTouchEvent(parent: CoordinatorLayout, child: V, event: MotionEvent): Boolean {
        return if (swipeEnabled) {
            super.onTouchEvent(parent, child, event)
        } else {
            false
        }
    }

    override fun onStartNestedScroll(
        coordinatorLayout: CoordinatorLayout,
        child: V,
        directTargetChild: View,
        target: View,
        axes: Int,
        type: Int
    ): Boolean {
        return if (swipeEnabled) {
            super.onStartNestedScroll(
                coordinatorLayout,
                child,
                directTargetChild,
                target,
                axes,
                type
            )
        } else {
            false
        }
    }

    override fun onNestedPreScroll(
        coordinatorLayout: CoordinatorLayout,
        child: V,
        target: View,
        dx: Int,
        dy: Int,
        consumed: IntArray,
        type: Int
    ) {
        if (swipeEnabled) {
            super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed, type)
        }
    }

    override fun onStopNestedScroll(
        coordinatorLayout: CoordinatorLayout,
        child: V,
        target: View,
        type: Int
    ) {
        if (swipeEnabled) {
            super.onStopNestedScroll(coordinatorLayout, child, target, type)
        }
    }

    override fun onNestedPreFling(
        coordinatorLayout: CoordinatorLayout,
        child: V,
        target: View,
        velocityX: Float,
        velocityY: Float
    ): Boolean {
        return if (swipeEnabled) {
            super.onNestedPreFling(coordinatorLayout, child, target, velocityX, velocityY)
        } else {
            false
        }
    }
}

并在您的xml文件中使用它：

And use it in your xml file:

app:layout_behavior="com.your.package.LockableBottomSheetBehavior"

它禁用所有用户操作，可以在仅以编程方式控制BottomSheet时使用。

It disables all users actions, it can be used when you want control BottomSheet only programmatically.

这篇关于禁止用户在BottomSheet上拖动的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！