转换为位图时不会呈现CardView阴影

Question

问题

我试图保存一个视图组(其中有一个CardView作为其childern)作为PNG文件.为达到这个,

1. 我给视图组充气并用所需信息填充视图
2. 通过Glide将图像加载到图像视图
3. 一个添加ViewTreeObserver.OnGlobalLayoutListener到ViewTreeObserver图像视图的并传递将要被共享到其将所述视图为位图的方法中的整个(父)视图当图像视图的底部是大于零(图像视图的高度属性被设置为wrap_content,从而它的底部将为零,直到图像被加载).

通过这样做,我能够将视图转换为位图,但有一点需要注意:该CardView节目未在位图上呈现.

失败的尝试

到目前为止,我已经尝试过:

1. 在layerType属性从"软件" 切换到"硬件".
2. 设置开启和关闭cardUseCompatPadding属性CardView.
3. 尝试在不使用Glide的情况下将图像设置为可绘制.
4. 尝试没有加载任何可绘制的图像.

代码

以下是可能有助于您识别问题的代码段:

用于将视图转换为位图的方法

public static Bitmap getBitmapFromView(View view) {
    //Define a bitmap with the same size as the view
    Bitmap b = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
    //Bind a canvas to it
    Canvas canvas = new Canvas(b);
    //Get the view's background
    Drawable bgDrawable = view.getBackground();
    if (bgDrawable != null)
        //has background drawable, then draw it on the canvas
        bgDrawable.draw(canvas);
    else
        //does not have background drawable, then draw white background on the canvas
        canvas.drawColor(Color.WHITE);
    // draw the view on the canvas
    view.draw(canvas);
    //return the bitmap
    return b;
}

正在膨胀并传递给getBitmapFromView()上面的视图的XML布局文件.

<LinearLayout 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:orientation="vertical"
    android:paddingBottom="16dp">

    <com.devspark.robototextview.widget.RobotoTextView
        android:id="@+id/title"
        style="@style/text_subhead"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="top"
        android:layout_marginBottom="@dimen/lessons_horizontal_margin_narrow"
        android:layout_marginLeft="@dimen/lessons_horizontal_margin_narrow"
        android:layout_marginRight="@dimen/lessons_horizontal_margin_narrow"
        android:layout_marginTop="@dimen/lessons_horizontal_margin_narrow"
        android:gravity="left"
        app:typeface="roboto_medium" />

    <com.devspark.robototextview.widget.RobotoTextView
        android:id="@+id/text"
        style="@style/text_subhead"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="@dimen/lessons_horizontal_margin_narrow"
        android:layout_marginRight="@dimen/lessons_horizontal_margin_narrow"
        android:gravity="left"
        android:textColor="@color/text"
        app:typeface="roboto_regular" />

    <android.support.v7.widget.CardView
        android:id="@+id/image_container"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/lessons_horizontal_margin_narrow"
        app:cardCornerRadius="@dimen/lessons_image_card_corner_radius"
        app:cardElevation="3dp"
        app:cardPreventCornerOverlap="false"
        app:cardUseCompatPadding="true">

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

            <com.makeramen.roundedimageview.RoundedImageView
                android:id="@+id/image"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:contentDescription="@null"
                app:riv_corner_radius_top_left="@dimen/lessons_image_card_corner_radius"
                app:riv_corner_radius_top_right="@dimen/lessons_image_card_corner_radius" />

            <com.devspark.robototextview.widget.RobotoTextView
                android:id="@+id/caption"
                style="@style/text_caption"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/lessons_image_card_caption_margin"
                android:gravity="left"
                app:typeface="roboto_condensed_regular" />

        </LinearLayout>

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

    <!-- Some other views that aren't particularly interesting -->

</LinearLayout>

Answer 1

只需将cardview更改为view，然后设置

android:background="@android:drawable/dialog_holo_light_frame"

因为你需要自己处理填充物