Disabling User dragging on BottomSheet

问题:

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;
                    }
                }
            });
        }
    });

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>

回答1:

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

import android.content.Context;
import android.support.design.widget.BottomSheetBehavior;
import android.support.design.widget.CoordinatorLayout;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

/**
 * Created by vitaliiobideiko on 10/5/16.
 */

public class UserLockBottomSheetBehavior<V extends View> extends BottomSheetBehavior<V> {

    public UserLockBottomSheetBehavior() {
        super();
    }

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

    @Override
    public boolean onInterceptTouchEvent(CoordinatorLayout parent, V child, MotionEvent event) {
        return false;
    }

    @Override
    public boolean onTouchEvent(CoordinatorLayout parent, V child, MotionEvent event) {
        return false;
    }

    @Override
    public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, V child, View directTargetChild, View target, int nestedScrollAxes) {
        return false;
    }

    @Override
    public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, V child, View target, int dx, int dy, int[] consumed) {}

    @Override
    public void onStopNestedScroll(CoordinatorLayout coordinatorLayout, V child, View target) {}

    @Override
    public boolean onNestedPreFling(CoordinatorLayout coordinatorLayout, V child, View target, float velocityX, float velocityY) {
        return false;
    }
}

It disables all users actions, it can be used when you want control BottomSheet only programmatically. You can edit it and create boolean flag for calling super methods instead of return false.

回答2:

check state in onStateChanged method of setBottomSheetCallback if state is BottomSheetBehavior.STATE_DRAGGING then change it to BottomSheetBehavior.STATE_EXPANDED this way you can stop STATE_DRAGGING by user. like below

final BottomSheetBehavior behavior = BottomSheetBehavior.from(bottomSheet);
        behavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
            @Override
            public void onStateChanged(@NonNull View bottomSheet, int newState) {
                if (newState == BottomSheetBehavior.STATE_DRAGGING) {
                    behavior.setState(BottomSheetBehavior.STATE_EXPANDED);
                }
            }

            @Override
            public void onSlide(@NonNull View bottomSheet, float slideOffset) {
            }
        });

---

use button to open close bottom sheet like below

fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (behavior.getState() == BottomSheetBehavior.STATE_HIDDEN) {
                    behavior.setState(BottomSheetBehavior.STATE_EXPANDED);
                } else {
                    behavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
                }
            }
        });

---

don't use setPeekHeight or app:behavior_peekHeight

by above way you can reach your goal

回答3:

Alright, so the accepted answer didn't work for me. However, Виталий Обидейко's answer inspired my final solution.

First, I created the following custom BottomSheetBehavior. It overrides all of the methods involving touch, and returns false (or did nothing) if it is locked. Otherwise, it acts like a normal BottomSheetBehavior. This disables the user's ability to drag down, and does not affect changing the state in code.

LockableBottomSheetBehavior.java

public class LockableBottomSheetBehavior<V extends View> extends BottomSheetBehavior<V> {

    private boolean mLocked = false;

    public LockableBottomSheetBehavior() {}

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

    public void setLocked(boolean locked) {
        mLocked = locked;
    }

    @Override
    public boolean onInterceptTouchEvent(CoordinatorLayout parent, V child, MotionEvent event) {
        boolean handled = false;

        if (!mLocked) {
            handled = super.onInterceptTouchEvent(parent, child, event);
        }

        return handled;
    }

    @Override
    public boolean onTouchEvent(CoordinatorLayout parent, V child, MotionEvent event) {
        boolean handled = false;

        if (!mLocked) {
            handled = super.onTouchEvent(parent, child, event);
        }

        return handled;
    }

    @Override
    public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, V child, View directTargetChild, View target, int nestedScrollAxes) {
        boolean handled = false;

        if (!mLocked) {
            handled = super.onStartNestedScroll(coordinatorLayout, child, directTargetChild, target, nestedScrollAxes);
        }

        return handled;
    }

    @Override
    public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, V child, View target, int dx, int dy, int[] consumed) {
        if (!mLocked) {
            super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed);
        }
    }

    @Override
    public void onStopNestedScroll(CoordinatorLayout coordinatorLayout, V child, View target) {
        if (!mLocked) {
            super.onStopNestedScroll(coordinatorLayout, child, target);
        }
    }

    @Override
    public boolean onNestedPreFling(CoordinatorLayout coordinatorLayout, V child, View target, float velocityX, float velocityY) {
        boolean handled = false;

        if (!mLocked) {
            handled = super.onNestedPreFling(coordinatorLayout, child, target, velocityX, velocityY);
        }

        return handled;

    }
}

Here's an example of how to use it. In my case, I needed it so the Bottom Sheet locked when expanded.

activity_home.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <android.support.design.widget.CollapsingToolbarLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_scrollFlags="scroll|snap"
            app:titleEnabled="false"/>
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"/>
    </android.support.design.widget.AppBarLayout>

    <!-- Use layout_behavior to set your Behavior-->
    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layoutManager="android.support.v7.widget.LinearLayoutManager"
        app:layout_behavior="com.myapppackage.LockableBottomSheetBehavior"/>

</android.support.design.widget.CoordinatorLayout>

HomeActivity.java

public class HomeActivity extends AppCompatActivity {
    BottomSheetBehavior mBottomSheetBehavior;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
        recyclerView.setAdapter(new SomeAdapter());

        mBottomSheetBehavior = BottomSheetBehavior.from(recyclerView);
        mBottomSheetBehavior.setBottomSheetCallback(new MyBottomSheetCallback());
    }

    class MyBottomSheetCallback extends BottomSheetBehavior.BottomSheetCallback() {
        @Override
        public void onStateChanged(@NonNull View bottomSheet, int newState) {
            if (newState == BottomSheetBehavior.STATE_EXPANDED) {
                if (mBottomSheetBehavior instanceof LockableBottomSheetBehavior) {
                    ((LockableBottomSheetBehavior) mBottomSheetBehavior).setLocked(true);
                }
            }
        }

        @Override
        public void onSlide(@NonNull View bottomSheet, float slideOffset) {}
    });
}

Hope this helps clear up a lot of the confusion!

回答4:

I ended up writing a workaround to address this use case of dynamically disabling user dragging, whereby BottomSheetBehavior is subclassed to override onInterceptTouchEvent, and to ignore it when a custom flag (in this case mAllowUserDragging) is set to false:

import android.content.Context;
import android.support.design.widget.BottomSheetBehavior;
import android.support.design.widget.CoordinatorLayout;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

public class WABottomSheetBehavior<V extends View> extends BottomSheetBehavior<V> {
    private boolean mAllowUserDragging = true;
    /**
     * Default constructor for instantiating BottomSheetBehaviors.
     */
    public WABottomSheetBehavior() {
        super();
    }

    /**
     * Default constructor for inflating BottomSheetBehaviors from layout.
     *
     * @param context The {@link Context}.
     * @param attrs   The {@link AttributeSet}.
     */
    public WABottomSheetBehavior(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public void setAllowUserDragging(boolean allowUserDragging) {
        mAllowUserDragging = allowUserDragging;
    }

    @Override
    public boolean onInterceptTouchEvent(CoordinatorLayout parent, V child, MotionEvent event) {
        if (!mAllowUserDragging) {
            return false;
        }
        return super.onInterceptTouchEvent(parent, child, event);
    }
}

And in your layout xml:

    <FrameLayout
        android:id="@+id/bottom_sheet_frag_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:behavior_hideable="true"
        app:behavior_peekHeight="@dimen/bottom_sheet_peek_height"
        app:elevation="@dimen/bottom_sheet_elevation"
        app:layout_behavior="com.example.ray.WABottomSheetBehavior" />

So far, this is the most consistently behaving solution for disabling user dragging on the Bottom Sheet on demand.

All of the other solutions that relied on firing another setState call in the onStateChanged callback resulted in the BottomSheet getting into a bad state, or causes significant UX issues (in the case of posting the setState call in a Runnable).

Hope this helps someone :)

Ray

回答5:

The accepted answer doesn't work on the first test device I use. And the bounce back is not smooth. It seems better to set the state to STATE_EXPANDED only after a user releases the dragging. The following is my version:

    final BottomSheetBehavior behavior = BottomSheetBehavior.from(findViewById(R.id.bottomSheet));
    behavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
        @Override
        public void onStateChanged(@NonNull View bottomSheet, int newState) {
            if (newState > BottomSheetBehavior.STATE_DRAGGING)
                bottomSheet.post(new Runnable() {
                    @Override public void run() {
                        behavior.setState(BottomSheetBehavior.STATE_EXPANDED);
                    }
                });
        }

        @Override
        public void onSlide(@NonNull View bottomSheet, float slideOffset) {
        }
    });

回答6:

To lock the BottomSheet and avoid the user to swipe it out this is what I did

public void showBottomSheet() {
    bsb.setHideable(false);
    bsb.setState(BottomSheetBehavior.STATE_EXPANDED);
}

public void hideBottomSheet() {
    bsb.setHideable(true);
    bsb.setState(BottomSheetBehavior.STATE_COLLAPSED);
}

It works quite well for me.

回答7:

Easy way to lock dragging is setPeekHeight same as view height. For example:

private LinearLayout bottomSheet;
private BottomSheetBehavior bottomBehavior;

@Override
public void onResume() {
    super.onResume();
    bottomBehavior = BottomSheetBehavior.from((bottomSheet);
    bottomBehavior.setPeekHeight(bottomSheet.getHeight());
    bottomBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
}

回答8:

Add this code to BottomSheetBehavior object. Dragging will be disabled. Works fine for me.

final BottomSheetBehavior behavior = BottomSheetBehavior.from((View) view.getParent());
    behavior.setHideable(false);
    behavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {

      @Override
      public void onStateChanged(@NonNull View bottomSheet, int newState) {
        if (newState == BottomSheetBehavior.STATE_DRAGGING) {
          behavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
        }

      }
      @Override
      public void onSlide(@NonNull View bottomSheet, float slideOffset) {

      }
});

回答9:

You don't need to block all events when the bottom sheet is disabled. You can block only ACTION_MOVE event. That's why use custom bottom sheet behavior like this

public class BottomSheetBehaviorWithDisabledState<V extends View> extends BottomSheetBehavior<V> {
    private boolean enable = true;

    /**
     * Default constructor for instantiating BottomSheetBehaviors.
     */
    public BottomSheetBehaviorWithDisabledState() {
        super();
    }

    /**
     * Default constructor for inflating BottomSheetBehaviors from layout.
     *
     * @param context The {@link Context}.
     * @param attrs   The {@link AttributeSet}.
     */
    public BottomSheetBehaviorWithDisabledState(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public void setEnable(boolean enable){
        this.enable = enable;
    }

    @Override
    public boolean onInterceptTouchEvent(CoordinatorLayout parent, V child, MotionEvent event) {
        if (!enable && event.getAction() == MotionEvent.ACTION_MOVE){
            return false;
        }
        return super.onInterceptTouchEvent(parent, child, event);
    }
}

回答10:

I have found amazing solution. The initial problem was once bottomSheet was going to HIDDEN state then it was not showing up at bottomSheetDialog.show(). But I wanted to get the dialog visible on show() method and also wanted to enable the user to swipe it down so that it feels like bottom sheet. Below is what I did..

    BottomSheetDialog itemTypeDialog = new BottomSheetDialog(this);
    View bottomSheetView = getLayoutInflater().inflate(R.layout.dialog_bottomsheet, null);
    itemTypeDialog.setContentView(bottomSheetView);
    BottomSheetBehavior bottomSheetBehavior = BottomSheetBehavior.from((View) bottomSheetView.getParent());
    bottomSheetBehavior.setBottomSheetCallback(bottomSheetCallback); // You can also attach the listener here itself.

    BottomSheetBehavior.BottomSheetCallback bottomSheetCallback =  new BottomSheetBehavior.BottomSheetCallback() {
    @Override
    public void onStateChanged(@NonNull View bottomSheet, int newState) {
        Log.d(TAG, "BottomSheetCallback: " + newState);
        if (newState == BottomSheetBehavior.STATE_HIDDEN) {
            bottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
            itemTypeDialog.dismiss();
        } 
    }

    @Override
    public void onSlide(@NonNull View bottomSheet, float slideOffset) {

    }
};

回答11:

Late answer, but, this is what worked for me, which is a bit different to what others have suggested.

You could try setting the cancelable property to false, i.e.

setCancelable(false);

and then manually handling the events where you would like to dismiss the dialog in the setupDialog method.

@Override
public void setupDialog(final Dialog dialog, final int style) {

    // handle back button
    dialog.setOnKeyListener(new DialogInterface.OnKeyListener() {
        @Override
        public boolean onKey(final DialogInterface dialog, final int keyCode, final KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_BACK) {
                dialog.dismiss();
            }
            return true;
        }
    });

    // handle touching outside of the dialog
    final View touchOutsideView = getDialog().getWindow().getDecorView().findViewById(android.support.design.R.id.touch_outside);
    touchOutsideView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(final View view) {
            dialog.dismiss();
        }
    });
}

This works with a ListView inside the dialog fragment, which was where I was getting a little stuck with other solutions.

回答12:

1. Copy BottomSheetDialog to your project and rename to MyBottomSheetDialog
2. add getBottomSheetBehavior to MyBottomSheetDialog
3. use MyBottomSheetDialog instead BottomSheetDialog
4. bottomSheetBehavior.setBottomSheetCallback

code like this

public class MyBottomSheetDialog extends AppCompatDialog {

    // some code

    public BottomSheetBehavior<FrameLayout> getBottomSheetBehavior() {
        return mBehavior;
    }

    // more code

in your code

    final BottomSheetBehavior<FrameLayout> bottomSheetBehavior = myBottomSheetDialog.getBottomSheetBehavior();
    bottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
        @Override
        public void onStateChanged(@NonNull View bottomSheet, int newState) {
            if (newState == BottomSheetBehavior.STATE_DRAGGING) {
                bottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
            }
        }

        @Override
        public void onSlide(@NonNull View bottomSheet, float slideOffset) {

        }

回答13:

set bottomSheet onClickListener to null.

bottomSheet.setOnClickListener(null);

this line disables all action about bottomSheet only and does not effect on inner view.

回答14:

This is basically the kotlin version of the right answer at the top:

class UserLockBottomSheetBehavior<V : View> : BottomSheetBehavior<V> {

    companion object {
        fun <V : View> from(view: V): UserLockBottomSheetBehavior<V> {
            val params = view.layoutParams as? CoordinatorLayout.LayoutParams
                ?: throw IllegalArgumentException("The view is not a child of CoordinatorLayout")
            val behavior = params.behavior as? UserLockBottomSheetBehavior<*>
                ?: throw IllegalArgumentException(
                    "The view is not associated with BottomSheetBehavior")
            return behavior as UserLockBottomSheetBehavior<V>
        }
    }

    constructor(ctx: Context, attrs: AttributeSet) : super(ctx, attrs)

    override fun onInterceptTouchEvent(parent: CoordinatorLayout, child: V, event: MotionEvent): Boolean {
        return false
    }

    override fun onTouchEvent(parent: CoordinatorLayout, child: V, event: MotionEvent): Boolean {
        return false
    }

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

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

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

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

回答15:

Here is a working version of the top solution in Kotlin:

import android.support.design.widget.BottomSheetBehavior
import android.support.design.widget.CoordinatorLayout
import android.view.MotionEvent
import android.view.View

class CustomBottomSheetBehavior<V : View> : BottomSheetBehavior<V>() {

    @Suppress("UNCHECKED_CAST")
    companion object {
        fun <V : View> from(view: V): CustomBottomSheetBehavior<V> {
            val params = view.layoutParams as? CoordinatorLayout.LayoutParams ?:
                throw IllegalArgumentException("The view is not a child of CoordinatorLayout")
                params.behavior as? BottomSheetBehavior<V> ?:
                    throw IllegalArgumentException("The view is not associated with BottomSheetBehavior")
                params.behavior = CustomBottomSheetBehavior<V>()
            return params.behavior as CustomBottomSheetBehavior<V>
        }
    }

    override fun onInterceptTouchEvent(parent: CoordinatorLayout, child: V, event: MotionEvent): Boolean {
        return false
    }

    override fun onTouchEvent(parent: CoordinatorLayout, child: V, event: MotionEvent): Boolean {
        return false
    }

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

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

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

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

Then whenever you wanna use:

val bottomSheetBehavior by lazy {
    CustomBottomSheetBehavior.from(bottom_sheet_main)
}

The bottom_sheet_main is the actual view using Kotlin Android Extensions.

回答16:

Adjusting the peakHeight value worked for me.

I set the peakheight as the height of bottomsheet if it is expanded.

    private val bottomSheetCallback = object : BottomSheetBehavior.BottomSheetCallback() {
    override fun onSlide(bottomSheet: View, slideOffset: Float) {

    }

    override fun onStateChanged(bottomSheet: View, newState: Int) {
        if (newState == BottomSheetBehavior.STATE_EXPANDED)
            bottomSheetBehavior.peekHeight = bottomSheet.height
    }
}

回答17:

Just in case maybe someone can help in the future, the best workaround for me was creating a new style and assigning:

<style name="BottomSheetDialogTheme" parent="BaseBottomSheetDialog">
    <item name="android:windowCloseOnTouchOutside">false</item>
</style> 

and then inside the BottomSheetDialogFragment class overrode the method:

 override fun getTheme(): Int = R.style.BottomSheetDialogTheme