将布局保存为位图

Question

我想将我的Linearlayout保存为bmp.

<LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/linearLayout_QrCode" >

        <Space
            android:layout_width="15dp"
            android:layout_height="match_parent"
            android:layout_gravity="center_vertical" />

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

            <Space
                android:layout_width="match_parent"
                android:layout_height="15dp" />

            <ImageView
                android:layout_width="185dp"
                android:layout_height="185dp"
                android:id="@+id/imageView_qrcode" />

            <Space
                android:layout_width="match_parent"
                android:layout_height="15dp" />

        </LinearLayout>

        <RelativeLayout
            android:layout_width="417dp"
            android:layout_height="match_parent" >

            <Space
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_centerVertical="true"
                android:layout_alignParentStart="true"
                android:id="@+id/space2" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:id="@+id/textView_QrSticker_label"
                android:layout_alignParentStart="true"
                android:layout_above="@+id/space2"
                android:textStyle="bold"
                android:textSize="40sp" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:id="@+id/textView_QrSticker_serial"
                android:layout_below="@+id/space2"
                android:layout_alignParentStart="true"
                android:textSize="30sp" />
        </RelativeLayout>

    </LinearLayout>

因此,我使用以下代码执行此操作:

        public Bitmap viewToBitmap(View view) {
            Bitmap bitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas(bitmap);
            view.draw(canvas);
            return bitmap;
        }

但如果我运行此代码,我的位图只包含ImageView(ImageView_qrcode).我检查了一下.如果我给Linearview充气TextViews正确显示,但输出bmp只包含ImageView有人知道的原因吗？

Answer 1

你可以尝试这个解决方案:

public static Bitmap getBitmapFromView(View view) {
    Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(),Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(returnedBitmap);
    Drawable bgDrawable =view.getBackground();
    if (bgDrawable!=null) {
    bgDrawable.draw(canvas);
    } else {
        canvas.drawColor(Color.WHITE);
    }
    view.draw(canvas);
    return returnedBitmap;
}

有绘图缓存的解决方案:

public Bitmap getBitmapFromView(View view){
    view.setDrawingCacheEnabled(true);
    return view.getDrawingCache();
}