Android中的透明底部布局

Question

我正在尝试制作透明的底部页面布局,这样我就可以看到它下方视图的内容.底部工作表按预期工作,但是当我将背景设置为@null或时@android:color/transparent,布局的视图是白色的,而不是透明的.我的布局如下:

app_bar_main.xml:

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/coordinatorLayout"
    android:background="@android:color/transparent"
    android:fitsSystemWindows="true"
    tools:context=".core.activities.MainActivity">
    <!-- stuff here -->
    <LinearLayout
        android:id="@+id/bottom_sheet"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:background="@null"
        android:orientation="vertical"
        app:layout_behavior="@string/bottom_sheet_behavior">
    </LinearLayout>

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

带有id的线性布局bottom_sheet,就是我的底页.表单本身定义如下:

<?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:background="@null"
    android:layout_height="match_parent">
    <LinearLayout android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@null"
        android:orientation="vertical">

        <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/bottom_sheet_placeholder_layout"
            android:layout_weight="0.6"
            android:layout_width="match_parent"
            android:background="@null"
            android:layout_height="50dp"
            android:orientation="horizontal">
        </LinearLayout>
        <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/bottom_sheet_layout"
            android:layout_margin="0dp"
            android:layout_weight="0.4"
            android:layout_width="match_parent"
            android:background="@color/my_background"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <ProgressBar
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center"
                android:id="@+id/my_progress_bar" />

            <TextView
                android:layout_marginTop="5dp"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:text="Large Text"
                android:textColor="@color/my_text"
                android:id="@+id/txt_my_info"
                android:layout_gravity="center_horizontal"
                android:visibility="gone"
                android:textSize="48px" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textAppearance="?android:attr/textAppearanceMedium"
                android:text="Medium Text"
                android:id="@+id/txt_my_address"
                android:textColor="@color/my_secondary_text"
                android:visibility="gone"
                android:layout_gravity="center_horizontal" />
        </LinearLayout>
    </LinearLayout>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/btn_edit_tree_info"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:clickable="true"
        android:layout_marginTop="-62dp"
        android:elevation="100dp"
        android:src="@drawable/ic_create_black_24dp"
        app:layout_anchor="@id/bottom_sheet_layout"
        app:layout_anchorGravity="top|end|right"
        app:useCompatPadding="true"/>
</android.support.design.widget.CoordinatorLayout>

Answer 1

答案要容易得多:只需添加此行即可

myDialog .getWindow() .findViewById(R.id.design_bottom_sheet) .setBackgroundResource(android.R.color.transparent);

并且不要更改标准ID(R.id.design_bottom_sheet和android.R.color.transparent).它使底部对话框的背景透明

Answer 2

在 styles.xml 中添加此内容

 <style name="TransparentDialog" parent="Theme.Design.Light.BottomSheetDialog">
    <item name="android:windowCloseOnTouchOutside">false</item>
    <item name="android:windowIsTranslucent">true</item>
    <item name="android:windowContentOverlay">@null</item>
    <item name="android:colorBackground">     @android:color/transparent</item>
    <item name="android:backgroundDimEnabled">true</item>
    <item name="android:backgroundDimAmount">0.3</item>
    <item name="android:windowFrame">@null</item>
    <item name="android:windowIsFloating">true</item>
</style>


   BottomSheetDialog bsDialog = new BottomSheetDialog(this,R.style.TransparentDialog);
   bsDialog.setContentView(R.layout.bottomsheet_dialog);
   bsDialog.show();

瞧，它起作用了

Answer 3

private void setupDialogBackground() {
    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);
            if (bottomSheet == null)
                return;
            bottomSheetBehavior = BottomSheetBehavior.from(bottomSheet);
            bottomSheet.setBackground(null);
        }
    });
}

Answer 4

在您的 color.xml 中创建：<color name="colorTransparent">#00000000</color> 并使用android:background="@color/colorTransparent"