Rounded corners for an Imageview in android

问题

I have a textview and imageview inside a linearlayout. Textview is at top and imageview at bottom. I used below lines to have rounded corners for linearlayout. But imageview corners are not rounding. I see only top corners of linearlayout are rounding. How can i have rounded bottom corners of imageview? ( I see all the corners are rounded if i remove imageview)

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>

screen shot :

回答1:

you can make the image's left bottom and right bottom corner rounded,like this:

code:

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;
}

this method can give you a image with left bottom and right bottom corner rounded.

回答2:

For having rounded corners for imageview, convert your image into bitmap and then try following code :

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;
}

回答3:

your linear layout is rounded corner and there is no doubt about that but your image is not. Here in the screen-shot the image is overlapping the linearlayout in the bottom. Try adding some padding to the linear layout(android:padding="20dp") . This should work.

来源：https://stackoverflow.com/questions/12550311/rounded-corners-for-an-imageview-in-android