Android BottomSheetDialogFragment 未完全展开

问题描述 投票：0回答：11

我有以下测试底部表实现。

当我将 peekHeight 设置为小于 500 的值时，它可以工作。在某个值之后，窥视高度的任何增加都不会改变底部工作表的扩展方式。它只是保留在那里，只能手动拖动。我们如何以编程方式设置 peekHeight 以确保底部工作表自动扩展到 peek 高度。

bottom_sheet_dialog_main

<?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:id="@+id/locUXCoordinatorLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <LinearLayout
        android:id="@+id/locUXView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:fitsSystemWindows="true"
        android:orientation="vertical"
        app:behavior_hideable="false"
        app:behavior_peekHeight="0dp"
        app:layout_behavior="@string/bottom_sheet_behavior">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:text="1 Value" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:text="2 Value" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:text="3 Value" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:text="4 Value" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:text="5 Value" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:text="6 Value" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:text="7 Value" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:text="8 Value" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:text="9 Value" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:text="First Value" />
    </LinearLayout>
</android.support.design.widget.CoordinatorLayout>

Java代码

public class MyBottomSheetDialogFragment extends BottomSheetDialogFragment {

    private static BottomSheetBehavior bottomSheetBehavior;
    private static View bottomSheetInternal;
    private static MyBottomSheetDialogFragment INSTANCE;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        getDialog().setOnShowListener(new DialogInterface.OnShowListener() {
            @Override
            public void onShow(DialogInterface dialog) {
                BottomSheetDialog d = (BottomSheetDialog) dialog;
                CoordinatorLayout coordinatorLayout = (CoordinatorLayout)d.findViewById(R.id.locUXCoordinatorLayout);
                bottomSheetInternal = d.findViewById(R.id.locUXView);
                bottomSheetBehavior = BottomSheetBehavior.from(bottomSheetInternal);
                bottomSheetBehavior.setPeekHeight(bottomSheetInternal.getHeight());
                bottomSheetInternal.requestLayout();
                coordinatorLayout.getLayoutParams().height = bottomSheetInternal.getHeight();
                Toast.makeText(getActivity(), "Height is" + bottomSheetInternal.getHeight() + "  " + coordinatorLayout.getLayoutParams().height, Toast.LENGTH_LONG).show();

            }
        });
        INSTANCE = this;
        return inflater.inflate(R.layout.bottom_sheet_dialog_main, container, false);
    }
}
java android android-support-library android-support-design bottom-sheet
11个回答
43
投票

在onCreateView中使用此代码。

getDialog().setOnShowListener(new DialogInterface.OnShowListener() {
        @Override
        public void onShow(DialogInterface dialog) {
            BottomSheetDialog d = (BottomSheetDialog) dialog;
            FrameLayout bottomSheet = (FrameLayout) d.findViewById(R.id.design_bottom_sheet);
            CoordinatorLayout coordinatorLayout = (CoordinatorLayout) bottomSheet.getParent();
            BottomSheetBehavior bottomSheetBehavior = BottomSheetBehavior.from(bottomSheet);
            bottomSheetBehavior.setPeekHeight(bottomSheet.getHeight());
            coordinatorLayout.getParent().requestLayout();
        }
    });
21
投票

我找到了另一个解决方案。也许对未来的读者有用。

@Override
public void setupDialog(Dialog dialog, int style) {
    super.setupDialog(dialog, style);
    final View root = View.inflate(getContext(), R.layout.fragment_bottom_sheet_choose_time, null);
    dialog.setContentView(root);
    initView(root);

    CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) ((View) root.getParent()).getLayoutParams();
    CoordinatorLayout.Behavior behavior = params.getBehavior();

    if (behavior != null && behavior instanceof BottomSheetBehavior) {
        mBottomSheetBehavior = (BottomSheetBehavior) behavior;
        mBottomSheetBehavior.setBottomSheetCallback(mBottomSheetBehaviorCallback);

        root.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                root.getViewTreeObserver().removeGlobalOnLayoutListener(this);
                int height = root.getMeasuredHeight();
                mBottomSheetBehavior.setPeekHeight(height);
            }
        });
    }
}

正如@Anthonyeef提到的，这里

ViewTreeObserver
的目的是在真正测量视图后获得准确的测量高度，并且删除
GlobalOnLayoutListener
以获得更好的性能。

但是，在生产中使用之前，请在不同的设备和屏幕上测试此解决方案，因为如果底部工作表中的内容高于屏幕，可能会产生一些奇怪的滑动行为。

17
投票

Kotlin 实现此目的的安全方法是：

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    dialog.setOnShowListener {
        val dialog = it as BottomSheetDialog
        val bottomSheet = dialog.findViewById<View>(R.id.design_bottom_sheet)
        bottomSheet?.let { sheet ->
            dialog.behavior.peekHeight = sheet.height
            sheet.parent.parent.requestLayout()
        }
    }
}

注意： 无需将布局包装在协调器布局中。

就像魅力一样。

12
投票

通过更深入的 UI 检查，我们发现还有另一个 

CoordinatorLayout
包裹了我们的协调器布局。父级 
CoordinatorLayout
有一个 
FrameLayout
，其中 
BottomSheetBehavior
的 id 为 
design_bottom_sheet
。由于 id 为 
match_parent
 的
FrameLayout
 的
design_bottom_sheet

高度，从上面的代码中设置的窥视高度受到限制

通过使用 id design_bottom_sheet 设置 

FrameLayout
的窥视高度，这个问题得到了解决

    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    getDialog().setOnShowListener(new DialogInterface.OnShowListener() {
        @Override
        public void onShow(DialogInterface dialog) {
            BottomSheetDialog d = (BottomSheetDialog) dialog;
            coordinatorLayout = (CoordinatorLayout) d.findViewById(R.id.locUXCoordinatorLayout);
            bottomSheetInternal = d.findViewById(R.id.locUXView);
            bottomSheetBehavior = BottomSheetBehavior.from(bottomSheetInternal);
            bottomSheetBehavior.setHidable(false);
            BottomSheetBehavior.from((View)coordinatorLayout.getParent()).setPeekHeight(bottomSheetInternal.getHeight());
            bottomSheetBehavior.setPeekHeight(bottomSheetInternal.getHeight());
            coordinatorLayout.getParent().requestLayout();

        }
    });
6
投票

感谢@athysirus 的巧妙方法。这是我最终得到的版本，以防有人想要一个可用的 kotlin 示例。

需要注意的是，一旦完成，您还应该删除全局布局侦听器。

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    view.viewTreeObserver.addOnGlobalLayoutListener(object : ViewTreeObserver.OnGlobalLayoutListener {
        override fun onGlobalLayout() {
            val bottomSheet = (dialog as BottomSheetDialog).findViewById<View>(com.google.android.material.R.id.design_bottom_sheet)
            BottomSheetBehavior.from<View>(bottomSheet).apply {
                state = BottomSheetBehavior.STATE_EXPANDED
                peekHeight = 0
            }
            view.viewTreeObserver.removeOnGlobalLayoutListener(this)
        }
    })
1
投票

Kotlin 中的解决方案受到 Nandish A 的帖子的启发，更详细。首先是布局：

<androidx.coordinatorlayout.widget.CoordinatorLayout
        android:id="@+id/container_root"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:id="@+id/bottom_sheet"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:behavior_hideable="false"
            app:behavior_peekHeight="0dp"
            app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior">

                  <!-- content of the bottom sheet -->

        </androidx.constraintlayout.widget.ConstraintLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>

然后将其放入您的

BottomSheetDialogFragment
：

override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {

        // ...        

        dialog.setOnShowListener {

            val root = dialog.find<CoordinatorLayout>(R.id.container_root)
            val bottomSheetInternal = root.find<ConstraintLayout>(R.id.bottom_sheet)

            val bottomSheetBehavior = BottomSheetBehavior.from(bottomSheetInternal)
            bottomSheetBehavior.isHideable = false
            BottomSheetBehavior.from(root.parent as View).peekHeight = root.height
            bottomSheetBehavior.peekHeight = root.height
            root.parent.requestLayout()
        }

        // ...
    }
1
投票

这就是我将 

peek_height
和 
layout_height
设置为 
BottomSheetDialogFragment

中底部工作表视图的方法 
dialog?.setOnShowListener {
                val dialog = dialog as BottomSheetDialog
                val bottomSheet = dialog.findViewById<FrameLayout>(R.id.design_bottom_sheet)
                val coordinatorLayout = bottomSheet?.parent as? CoordinatorLayout
                val bottomSheetBehavior = BottomSheetBehavior.from(bottomSheet)
                bottomSheet?.viewTreeObserver?.addOnGlobalLayoutListener {
                    bottomSheet.viewTreeObserver.removeOnGlobalLayoutListener {}
                    bottomSheetBehavior.peekHeight = getPopupHeight(.5f)
                    val params = bottomSheet.layoutParams
                    params.height = getPopupHeight(1f)
                    bottomSheet.layoutParams = params
                    coordinatorLayout?.parent?.requestLayout()
                }
            }

此方法获取屏幕高度的百分比

 private fun getPopupHeight(percent: Float): Int {
        val displayMetrics = DisplayMetrics()
        activity?.windowManager?.defaultDisplay?.getMetrics(displayMetrics)
        return (displayMetrics.heightPixels * percent).toInt()
    }
0
投票

这对我来说是个窍门！我的类扩展了 BottomSheetDialogFragment

@Override
public void onStart()
{
    super.onStart();
    Dialog dialog = getDialog();

    if (dialog != null)
    {
        View bottomSheet = dialog.findViewById(R.id.bottom_sheet);
        bottomSheet.getLayoutParams().height = ViewGroup.LayoutParams.MATCH_PARENT;
    }
    View view = getView();
    view.post(() -> {
        View bottomSheet = dialog.findViewById(R.id.bottom_sheet);
        View parent = (View) view.getParent();
        CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) (parent).getLayoutParams();
        CoordinatorLayout.Behavior behavior = params.getBehavior();
        BottomSheetBehavior bottomSheetBehavior = (BottomSheetBehavior) behavior;
        bottomSheetBehavior.setPeekHeight(view.getMeasuredHeight());
        ((View) bottomSheet.getParent()).setBackgroundColor(Color.TRANSPARENT);
    });
}

@Override
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
    View view = inflater.inflate(R.layout.screen_delivery_type, container, false);

    getDialog().setOnShowListener(new DialogInterface.OnShowListener()
    {
        @Override
        public void onShow(DialogInterface dialog)
        {
            BottomSheetDialog d = (BottomSheetDialog) dialog;
            FrameLayout bottomSheet = (FrameLayout) d.findViewById(R.id.bottom_sheet);
            CoordinatorLayout coordinatorLayout = (CoordinatorLayout) bottomSheet.getParent();
            BottomSheetBehavior bottomSheetBehavior = BottomSheetBehavior.from(bottomSheet);
            bottomSheetBehavior.setPeekHeight(bottomSheet.getHeight());
            bottomSheetBehavior.setFitToContents(true);
            bottomSheetBehavior.setExpandedOffset(0);
            bottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
            coordinatorLayout.getParent().requestLayout();
        }
    });
}
0
投票

此代码是答案的组合。因为其中一些不适合我。

在 XML ids.xml 中：

<item name="sheet_parent_container" type="id" />

在 XML 布局中：

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@id/sheet_parent_container"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom">

    **Dialog content here!**

</androidx.coordinatorlayout.widget.CoordinatorLayout>

在 BottomSheetDialogFragment.kt 中：

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)

    ...

    setPeekHeight(view)
}

/**
 * Function for disable half height display after screen rotation.
 */
private fun setPeekHeight(view: View) {
    val parentContainer = view.findViewById<CoordinatorLayout>(R.id.sheet_parent_container)

    dialog?.setOnShowListener {
        val dialogParent = parentContainer.parent as View
        BottomSheetBehavior.from(dialogParent).peekHeight = parentContainer.height
        dialogParent.requestLayout()
    }
}
0
投票

您只需在 

setFitToContents(true)
上调用 
BottomSheetBehavior
方法即可使其不完全展开，并且其高度将等于底部工作表布局的高度。确保您的布局高度设置为 
wrap_content
。

0
投票

通过像这样使用 BottomSheetCallback :

class MyBottomSheetDialogFragment() : BottomSheetCallback() { 

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        bottomSheetBehavior.addBottomSheetCallback(this)
    }

    override fun onStateChanged(bottomSheet: View, newState: Int) {
        val slideOffset: Float = bottomSheetBehavior.calculateSlideOffset()
        if (newState == STATE_EXPANDED && slideOffset < 1f) {
            // Enforce to expand the bottom sheet fully.
            bottomSheetBehavior.halfExpandedRatio = slideOffset
            bottomSheetBehavior.state = STATE_HALF_EXPANDED
            bottomSheetBehavior.state = STATE_EXPANDED
        }
    }

    override fun onSlide(bottomSheet: View, slideOffset: Float) {
        if (slideOffset > 1f) {
            // Reduce the height of the expanded bottom sheet.
            bottomSheetBehavior.halfExpandedRatio = BOTTOM_SHEET_SLIDE_OFFSET_ALMOST_FULL
            bottomSheetBehavior.state = STATE_HALF_EXPANDED
            bottomSheetBehavior.state = STATE_EXPANDED
        }
    }

    companion object {
        private const val BOTTOM_SHEET_SLIDE_OFFSET_ALMOST_FULL = 0.9f
    }
}
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