我有一个自定义的bittomsheetdialogfragment,我想在底部视图的顶部有圆角

这是我的自定义类,它膨胀了我想要从底部显示的布局

View mView;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    mView = inflater.inflate(R.layout.charge_layout, container, false);
    initChargeLayoutViews();
    return mView;
}

我还有这个XML资源文件作为背景:

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle"
    >
    <corners android:topRightRadius="35dp"
        android:topLeftRadius="35dp"
        />
    <solid android:color="@color/white"/>

    <padding android:top="10dp"
        android:bottom="10dp"
        android:right="16dp"
        android:left="16dp"/>
</shape>

问题是,当我把这个资源文件设置为我的布局的根元素的背景,角仍然不是圆角。

我不能使用以下代码:

this.getDialog().getWindow().setBackgroundDrawableResource(R.drawable.charge_layout_background);

因为它覆盖了底部对话框的默认背景,底部视图上方不会有任何半透明的灰色。


当前回答

创建一个名为rounded_corners_shape的形状

<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle">
    <corners
        android:topLeftRadius="8dp"
        android:topRightRadius="8dp"/>
    <solid android:color="@color/white"/>

</shape>

定义一个样式

  <style name="AppBottomSheetDialogTheme"
           parent="Theme.Design.Light.BottomSheetDialog">
        <item name="bottomSheetStyle">@style/AppModalStyle</item>
    </style>

    <style name="AppModalStyle" parent="Widget.Design.BottomSheet.Modal">
        <item name="android:background">@drawable/rounded_corners_shape</item>
    </style>

在你的自定义BottomSheetDialogFragment上使用这种风格,它会工作的!

 public class CustomDialogFragment extends BottomSheetDialogFragment {
      @Override
      public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setStyle(STYLE_NORMAL, R.style. AppBottomSheetDialogTheme);
      }

      ...
    }

其他回答

Create a shape drawable .. which we will use as background for bottom sheet . Provide the appropriate value for radius of top left and right corner . <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <corners android:topLeftRadius="24dp" android:topRightRadius="24dp" /> <padding android:top="2dp" /> <solid android:color="@color/white" /> </shape> Now create style for " Bottom sheet dialog fragment " <style name="BottomSheet" parent="@style/Widget.Design.BottomSheet.Modal"> <item name="android:background">@drawable/drawable_bottomsheet_background</item> </style> <style name="BaseBottomSheetDialog" parent="@style/Theme.Design.Light.BottomSheetDialog"> <item name="android:windowIsFloating">false</item> <item name="bottomSheetStyle">@style/BottomSheet</item> </style> <style name="BottomSheetDialogTheme" parent="BaseBottomSheetDialog" /> Now create a custom class that will extend BottomSheetDilogFragment ,where you provide your style . open class CustomRoundBottomSheet : BottomSheetDialogFragment() { override fun getTheme(): Int = R.style.BottomSheetDialogTheme override fun onCreateDialog(savedInstanceState: Bundle?): Dialog = BottomSheetDialog(requireContext(), theme) } Now use this class wherever you want to have round corner bottom sheet . eg class BottomSheetSuccess : CustomRoundBottomSheet() { override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { return inflater.inflate(R.layout.bottomsheet_shopcreate_success, container, false) } override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) } }

正如在其他答案中指出的,当state为BottomSheetBehavior时。STATE_EXPANDED角将被压平。

你可以通过设置BottomSheetBehavior的peekHeight属性并使用自定义样式来克服这个问题。

abstract class BaseBottomSheetFragment : BottomSheetDialogFragment(){

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    
        if (state == BottomSheetBehavior.STATE_EXPANDED) {
            val displayMetrics = DisplayMetrics()
            requireActivity().windowManager!!.defaultDisplay!!.getMetrics(displayMetrics)
            (dialog as BottomSheetDialog).behavior.peekHeight = displayMetrics.heightPixels
        } else {
            (dialog as BottomSheetDialog).behavior.state = state
        }
    }

    override fun getTheme(): Int {
        return R.style.CustomBottomSheetDialog
    }
}

CustomBottomSheetDialog风格

<style name="CustomBottomSheetDialog" parent="@style/ThemeOverlay.MaterialComponents.BottomSheetDialog">
    <item name="bottomSheetStyle">@style/CustomBottomSheet</item>
    <item name="materialButtonStyle">@style/CustomMaterialButtonStyle</item>
</style>

<style name="CustomMaterialButtonStyle" parent="@style/Widget.MaterialComponents.Button">
    <item name="cornerRadius">@dimen/dialog_bottom_radius</item>
</style>

<style name="CustomBottomSheet" parent="Widget.MaterialComponents.BottomSheet">
    <item name="shapeAppearanceOverlay">@style/CustomShapeAppearanceBottomSheetDialog</item>
</style>

<style name="CustomShapeAppearanceBottomSheetDialog" parent="">
    <item name="android:background">@android:color/transparent</item>
    <item name="backgroundTint">@android:color/transparent</item>
    <item name="cornerFamily">rounded</item>
    <item name="cornerSizeTopRight">@dimen/dialog_bottom_radius</item>
    <item name="cornerSizeTopLeft">@dimen/dialog_bottom_radius</item>
    <item name="cornerSizeBottomRight">0dp</item>
    <item name="cornerSizeBottomLeft">0dp</item>
</style>

如果你使用材质组件的最后一个版本,你只需要覆盖ShapeAppearance.MaterialComponents.LargeComponent(因为底部表使用这个形状),并设置你想要的值:

 <style name="ShapeAppearance.YourApp.LargeComponent" parent="ShapeAppearance.MaterialComponents.LargeComponent">
        <item name="cornerFamily">rounded</item>
        <item name="cornerSize">12dp</item>
 </style>

然后设置你的应用样式:

<item name="shapeAppearanceLargeComponent">@style/ShapeAppearance.YourApp.LargeComponent</item>

Gabriele Mariotti的方法与此类似,也很有效,但这个方法更简单。

添加圆角形状,使其为你的根布局的背景

<?xml version="1.0" encoding="utf-8" ?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
 <corners
    android:topLeftRadius="@dimen/padding_margin_16_dp"
    android:topRightRadius="@dimen/padding_margin_16_dp" />
 <solid android:color="@color/white" />
</shape>

在你的BottomSheetDialogFragment上使背景透明

override fun onActivityCreated(savedInstanceState: Bundle?) {
    super.onActivityCreated(savedInstanceState)
    (view?.parent as View).setBackgroundColor(Color.TRANSPARENT)
}

它的工作为约束布局,框架布局,线性布局,相对布局。

如果您正在使用材质组件主题,您可以通过将背景颜色设置为透明,然后将布局的背景设置为四舍五入来覆盖BottomSheetDialog的默认行为。

    <style name="Theme.MyApp" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="bottomSheetDialogTheme">@style/BottomSheetDialog</item>
    </style>

    <style name="BottomSheetDialog" parent="ThemeOverlay.MaterialComponents.BottomSheetDialog">
        <item name="bottomSheetStyle">@style/bottomSheetStyleWrapper</item>
    </style>

    <style name="bottomSheetStyleWrapper" parent="Widget.MaterialComponents.BottomSheet.Modal">
        <item name="android:backgroundTint">@android:color/transparent</item>
    </style>

rounded_corner.xml:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="@color/white"/>
    <corners android:topLeftRadius="26dp"
        android:topRightRadius="26dp"/>

</shape>

然后将形状应用到你的底部表格根布局的背景:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/rounded_corner">

    <!-- 
       other layout components
     -->

</LinearLayout>

注意,如果你在底部表单布局中使用Webview这样的组件,你可能无法实现预期的圆角,因为Webview有一个默认的白色背景。在这种情况下,你可以像这样简单地删除背景:

webView.setBackgroundColor(0);