android中Imageview的圆角

Question

我在线性布局中有一个 textview 和 imageview。 Textview 在顶部，imageview 在底部。我使用下面的线为线性布局设置圆角。但是 imageview 的角不是圆角的。我看到只有线性布局的顶角是四舍五入的。 我怎样才能使 imageview 的底角变圆？（如果我删除 imageview，我看到所有的角都是圆的）

rounded_corners.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >

<solid android:color="#ffffff" />


<corners
    android:bottomLeftRadius="8dp"
    android:bottomRightRadius="8dp"
    android:topLeftRadius="8dp"
    android:topRightRadius="8dp" />

</shape>

main.xml

  <LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="50dp"
    android:layout_marginLeft="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginTop="50dp"
    android:background="@xml/rounded_corners"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="xxxxxxxx" />

    <ImageView     
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:scaleType="centerCrop"
        android:src="@drawable/my_image_view" />
</LinearLayout>

屏幕截图：

Answer 1

你可以把图片的左下角和右下角弄圆，像这样：

代码：

public static Bitmap getRoundCornerBitmap(Bitmap bitmap, int radius) {
    int w = bitmap.getWidth();
    int h = bitmap.getHeight();
    Bitmap output = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(output);

    final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    final RectF rectF = new RectF(0, 0, w, h);

    canvas.drawRoundRect(rectF, radius, radius, paint);

    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(bitmap, null, rectF, paint);

    /**
     * here to define your corners, this is for left bottom and right bottom corners
     */
    final Rect clipRect = new Rect(0, 0, w, h - radius);
    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC));
    canvas.drawRect(clipRect, paint);

    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(bitmap, null, rectF, paint);

    bitmap.recycle();

    return output;
}

这种方法可以给你一个左下角和右下角圆角的图像。

Answer 2

对于图像视图的圆角，将您的图像转换为位图，然后尝试以下代码：

public static Bitmap roundCorner(Bitmap src, float round) 
{
    // image size
    int width = src.getWidth();
    int height = src.getHeight();

    // create bitmap output
    Bitmap result = Bitmap.createBitmap(width, height, Config.ARGB_8888);

    // set canvas for painting
    Canvas canvas = new Canvas(result);
    canvas.drawARGB(0, 0, 0, 0);

    // config paint
    final Paint paint = new Paint();
    paint.setAntiAlias(true);
    paint.setColor(Color.BLACK);

    // config rectangle for embedding
    final Rect rect = new Rect(0, 0, width, height);
    final RectF rectF = new RectF(rect);

    // draw rect to canvas
    canvas.drawRoundRect(rectF, round, round, paint);

    // create Xfer mode
    paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
    // draw source image to canvas
    canvas.drawBitmap(src, rect, rect, paint);

    // return final image
     return result;
}

Answer 3

您的线性布局是圆角，这是毫无疑问的，但您的图像不是。在屏幕截图中，图像与底部的线性布局重叠。尝试在线性布局中添加一些填充(android:padding="20dp")。这应该可以。