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
有一个很酷的库可以让你塑造imageviews。
这里有一个例子:
<com.github.siyamed.shapeimageview.mask.PorterShapeImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:siShape="@drawable/shape_rounded_rectangle"
android:src="@drawable/neo"
app:siSquare="true"/>
形状定义:
<shape android:shape="rectangle" xmlns:android="http://schemas.android.com/apk/res/android">
<corners
android:topLeftRadius="18dp"
android:topRightRadius="18dp"
android:bottomLeftRadius="18dp"
android:bottomRightRadius="18dp" />
<solid android:color="@color/black" />
</shape>
结果:
其他回答
您应该扩展ImageView并绘制自己的圆角矩形。
如果你想在图像周围添加一个框架,你也可以在布局中将圆形框架叠加在图像视图的顶部。
例如,通过使用FrameLayout将帧叠加到原始图像上。FrameLayout的第一个元素将是你想要显示的图像。然后添加另一个ImageView与框架。第二个ImageView将显示在原始ImageView的顶部,因此Android将在原始ImageView上方绘制它的内容。
尝试材质组件库并使用ShapeableImageView。 大概是这样的:
Java:
imageView=new ShapeableImageView(context);
imageView.setShapeAppearanceModel(
imageView.getShapeAppearanceModel()
.toBuilder()
.setAllCornerSizes(20)
.build());
芬兰湾的科特林:
val imageView = ShapeableImageView(context)
imageView.setShapeAppearanceModel(
imageView.getShapeAppearanceModel()
.toBuilder()
.setAllCornerSizes(20f)
.build())
/**
* Background Async task to load user profile picture from url
*/
private class LoadProfileImage extends AsyncTask<String, Void, RoundedBitmapDrawable> {
ImageView profileImageView;
public LoadProfileImage(ImageView profileImageView) {
this.profileImageView = profileImageView;
}
protected RoundedBitmapDrawable doInBackground(String... urls) {
String photoUrl = urls[0];
RoundedBitmapDrawable profileRoundedDrawable = null;
try {
InputStream inputStream = new java.net.URL(photoUrl).openStream();
Resources res = getResources();
profileRoundedDrawable = RoundedBitmapDrawableFactory.create(res, inputStream);
profileRoundedDrawable.setCircular(true);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return profileRoundedDrawable;
}
protected void onPostExecute(RoundedBitmapDrawable result) {
profileImageView.setImageDrawable(result);
}
}
为了Glide 4.x.x
使用下面的简单代码
Glide
.with(context)
.load(uri)
.apply(
RequestOptions()
.circleCrop())
.into(imageView)
让你的ImageView像这样:
<com.example..CircularImageView
android:id="@+id/profile_image_round_corner"
android:layout_width="80dp"
android:layout_height="80dp"
android:scaleType="fitCenter"
android:padding="2dp"
android:background="@null"
android:adjustViewBounds="true"
android:layout_centerInParent="true"
android:src="@drawable/dummy"
/>
并创建一个类:
package com.example;
import java.util.Formatter.BigDecimalLayoutForm;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;
public class CircularImageView extends ImageView {
public CircularImageView(Context context) {
super(context);
}
public CircularImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CircularImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onDraw(Canvas canvas) {
Drawable drawable = getDrawable();
if (drawable == null) {
return;
}
if (getWidth() == 0 || getHeight() == 0) {
return;
}
Bitmap b = ((BitmapDrawable) drawable).getBitmap();
Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
int w = getWidth(), h = getHeight();
Bitmap roundBitmap = getRoundBitmap(bitmap, w);
canvas.drawBitmap(roundBitmap, 0, 0, null);
}
public static Bitmap getRoundBitmap(Bitmap bmp, int radius) {
Bitmap sBmp;
if (bmp.getWidth() != radius || bmp.getHeight() != radius) {
float smallest = Math.min(bmp.getWidth(), bmp.getHeight());
float factor = smallest / radius;
sBmp = Bitmap.createScaledBitmap(bmp, (int)(bmp.getWidth() / factor), (int)(bmp.getHeight() / factor), false);
} else {
sBmp = bmp;
}
Bitmap output = Bitmap.createBitmap(radius, radius, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xffa19774;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, radius, radius);
paint.setAntiAlias(true);
paint.setFilterBitmap(true);
paint.setDither(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(Color.parseColor("#BAB399"));
canvas.drawCircle(radius / 2 + 0.7f,
radius / 2 + 0.7f, radius / 2 + 0.1f, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(sBmp, rect, rect, paint);
return output;
}
}