在Android中,ImageView默认是一个矩形。如何使它成为一个圆角矩形(剪辑我的位图的所有4个角为圆角矩形)在ImageView?
请注意,从2021年起,只需使用ShapeableImageView
在Android中,ImageView默认是一个矩形。如何使它成为一个圆角矩形(剪辑我的位图的所有4个角为圆角矩形)在ImageView?
请注意,从2021年起,只需使用ShapeableImageView
当前回答
它可以很容易地完成下面的形状。将其作为src添加到图像中。 如果你想删除边界,只需添加你的背景颜色的边界 :-)
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:drawable="@drawable/img_area_one"
android:bottom="5dp"
android:left="5dp"
android:right="5dp"
android:top="5dp" />
<item>
<shape
android:padding="10dp"
android:shape="rectangle">
<corners
android:topLeftRadius="8dp"
android:topRightRadius="8dp"
/>
<stroke
android:width="5dp"
android:color="@color/white" />
</shape>
</item>
</layer-list>
其他回答
应用一个形状到你的imageView如下所示:
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<solid android:color="#faf5e6" />
<stroke
android:width="1dp"
android:color="#808080" />
<corners android:radius="15dp" />
<padding
android:bottom="5dp"
android:left="5dp"
android:right="5dp"
android:top="5dp" />
</shape>
这可能对你的朋友有帮助。
使用这个得到圆形图像与边界
public static Bitmap getCircularBitmapWithBorder(Bitmap bitmap, int bordercolor) {
if (bitmap == null || bitmap.isRecycled()) {
return null;
}
int borderWidth=(int)(bitmap.getWidth()/40);
final int width = bitmap.getWidth() + borderWidth;
final int height = bitmap.getHeight() + borderWidth;
Bitmap canvasBitmap = Bitmap.createBitmap(width, height,
Bitmap.Config.ARGB_8888);
BitmapShader shader = new BitmapShader(bitmap, TileMode.CLAMP,
TileMode.CLAMP);
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setShader(shader);
Canvas canvas = new Canvas(canvasBitmap);
float radius = width > height ? ((float) height) / 2f
: ((float) width) / 2f;
canvas.drawCircle(width / 2, height / 2, radius, paint);
paint.setShader(null);
paint.setStyle(Paint.Style.STROKE);
paint.setColor(bordercolor);
paint.setStrokeWidth(borderWidth);
canvas.drawCircle(width / 2, height / 2, radius - borderWidth / 2,
paint);
return canvasBitmap;
}
我知道这个问题已经过时了,但这里有另一种更简单的四舍五入图像的方法:
这是一种编程方法。
创造你的空白……
} public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) { Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output); final int color = 0xff424242;
final Paint paint = new Paint(); final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
final float roundPx = pixels; paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0); paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint); return output;
加载图像,然后设置圆角
imageview1.setImageResource(R.drawable.yourimage);
Bitmap bm = ((android.graphics.drawable.BitmapDrawable) imageview1.getDrawable()).getBitmap();
imageview1.setImageBitmap(getRoundedCornerBitmap(bm, 30));
以30为半径,你会得到这样的结果:
不管我的图像看起来如何,它只是一个放大的小图标
虽然前两个答案是可行的,但我希望再多描述一点。 比如说,ImageView所在的地方有一个活动或片段。您希望绘制图像并按比例缩放。然后你应该在onCreate或onCreateView中写入如下代码:
LinearLayout rootLayout = (LinearLayout) findViewById(R.id.rootLayout);
ImageView image = (ImageView) findViewById(R.id.image);
// Wait till an activity is visible and image can be measured.
rootLayout.post(new Runnable() {
@Override
public void run() {
// Setting ImageView height with aspect ratio.
Drawable drawable = ContextCompat.getDrawable(getActivity(), R.drawable.your_image);
int height = getImageViewHeight(drawable, image);
// Rounding image corners.
float radius = getResources().getDimension(R.dimen.your_radius_in_dp);
Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
Bitmap result = getRoundedBitmap(bitmap, image.getWidth(), height, radius);
image.setImageBitmap(result);
}
});
其中设置新的图像高度为:
public static int getImageViewHeight(Drawable drawable, ImageView imageView) {
imageView.setImageDrawable(drawable);
int width = drawable.getIntrinsicWidth();
int height = 0;
if (width > 0) {
height = (drawable.getIntrinsicHeight() * imageView.getWidth()) / width;
imageView.getLayoutParams().height = height;
imageView.requestLayout();
}
return height;
}
然后,您应该编写一个方法来缩放图像并使其圆角。这里的width和height是位图的新维度(更小或更大)。在下面的例子中,我只圆角上的两个角。
private Bitmap getRoundedBitmap(Bitmap bitmap, int width, int height, float radius) {
// Create scaled bitmap.
Bitmap scaledBitmap = Bitmap.createScaledBitmap(bitmap, width, height, false);
BitmapShader shader = new BitmapShader(scaledBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setShader(shader);
Bitmap result = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(result);
// First make all corners round.
canvas.drawRoundRect(new RectF(0, 0, width, height), radius, radius, paint);
// Then draw bottom rectangle.
canvas.drawRect(0, height - radius, radius, height, paint);
canvas.drawRect(width - radius, height - radius, width, height, paint);
return result;
}
非常感谢第一个回答。下面是修改后的版本,将矩形图像转换为正方形(和圆形),填充颜色作为参数传递。
public static Bitmap getRoundedBitmap(Bitmap bitmap, int pixels, int color) {
Bitmap inpBitmap = bitmap;
int width = 0;
int height = 0;
width = inpBitmap.getWidth();
height = inpBitmap.getHeight();
if (width <= height) {
height = width;
} else {
width = height;
}
Bitmap output = Bitmap.createBitmap(width, height, Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, width, height);
final RectF rectF = new RectF(rect);
final float roundPx = pixels;
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(inpBitmap, rect, rect, paint);
return output;
}