我想让任何图像从我的ImageView是圆形的边界。
我搜索了一下,但没有找到任何有用的信息(我尝试的任何方法都不管用)。
如何通过XML实现这一点: 创建一个ImageView与某些src,并使它与边界圆形?
我想让任何图像从我的ImageView是圆形的边界。
我搜索了一下,但没有找到任何有用的信息(我尝试的任何方法都不管用)。
如何通过XML实现这一点: 创建一个ImageView与某些src,并使它与边界圆形?
当前回答
如果您希望将图像切割成圆形显示,可以这样做
public static Bitmap getCircularBitmap(Bitmap bitmap) {
Bitmap output;
if (bitmap.getWidth() > bitmap.getHeight()) {
output = Bitmap.createBitmap(bitmap.getHeight(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
} else {
output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getWidth(), 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());
float r = 0;
if (bitmap.getWidth() > bitmap.getHeight()) {
r = bitmap.getHeight() / 2;
} else {
r = bitmap.getWidth() / 2;
}
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawCircle(r, r, r, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
其他回答
如果你在应用中使用材质设计,那么就使用这个
<com.google.android.material.card.MaterialCardView
android:layout_width="75dp"
android:layout_height="75dp"
app:cardCornerRadius="50dp"
app:strokeWidth="1dp"
app:strokeColor="@color/black">
<ImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/circular_image"
android:scaleType="fitCenter"
android:src="@drawable/your_img" />
</com.google.android.material.card.MaterialCardView>
创建一个CustomImageview,然后简单地覆盖它的onDraw()方法如下:
@Override
protected void onDraw(Canvas canvas) {
float radius = this.getHeight()/2;
Path path = new Path();
RectF rect = new RectF(0, 0, this.getWidth(), this.getHeight());
path.addRoundRect(rect, radius, radius, Path.Direction.CW);
canvas.clipPath(path);
super.onDraw(canvas);
}
如果你想要的代码自定义小部件以及:-
CircularImageView.java
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Path;
import android.graphics.RectF;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;
import androidx.annotation.Nullable;
public class CircularImageView extends ImageView {
private Drawable image;
public CircularImageView(Context context) {
super(context);
init(null, 0);
}
public CircularImageView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init(attrs, 0);
}
public CircularImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(attrs, defStyleAttr);
}
@Override
protected void onDraw(Canvas canvas) {
float radius = this.getHeight()/2;
Path path = new Path();
RectF rect = new RectF(0, 0, this.getWidth(), this.getHeight());
path.addRoundRect(rect, radius, radius, Path.Direction.CW);
canvas.clipPath(path);
super.onDraw(canvas);
}
private void init(AttributeSet attrs, int defStyle) {
TypedArray a = Utils.CONTEXT.getTheme().obtainStyledAttributes(attrs, R.styleable.CircularImageView, 0, 0);
try {
image = a.getDrawable(R.styleable.CircularImageView_src);
} finally {
a.recycle();
}
this.setImageDrawable(image);
}
}
此外,在res/attrs.xml中添加以下代码来创建所需的属性
<declare-styleable name="CircularImageView">
<attr name="src" format="reference" />
</declare-styleable>
我有一个简单的解决办法。 通过右键单击软件包名称并选择new ->Image asset创建一个新的Image asset。 输入名称(任何名称)和路径(映像在系统中的位置)。 然后单击“下一步”和“完成”。 如果您输入图像名称为“img”,则在mipmap文件夹中自动创建一个名称为“img_round”的圆形图像。
然后,这样做:
<ImageView
android:layout_width="100dp"
android:layout_height="100dp"
android:src="@mipmap/img_round"/>
您的预览可能仍然显示一个矩形图像。但如果你在你的设备上运行应用程序,它将是圆形的。
2021年更新:使用Glide v4 CircleCrop参见https://bumptech.github.io/glide/doc/generatedapi.html
implementation 'com.github.bumptech.glide:glide:4.11.0'
annotationProcessor 'com.github.bumptech.glide:compiler:4.11.0'
XML
<ImageView
android:id="@+id/vinyl"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:ignore="ContentDescription" />
在代码中
Glide.with(this)
.load("https://images.pexels.com/photos/3828241/pexels-photo-3828241.jpeg")
.transform(CircleCrop())
.into(rootView.findViewById<ImageView>(R.id.vinyl))
试试这个。
public class RoundedImageView extends android.support.v7.widget.AppCompatImageView {
private int borderWidth = 4;
private int viewWidth;
private int viewHeight;
private Bitmap image;
private Paint paint;
private Paint paintBorder;
private BitmapShader shader;
public RoundedImageView(Context context)
{
super(context);
setup();
}
public RoundedImageView(Context context, AttributeSet attrs)
{
super(context, attrs);
setup();
}
public RoundedImageView(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
setup();
}
private void setup()
{
paint = new Paint();
paint.setAntiAlias(true);
paintBorder = new Paint();
setBorderColor(Color.WHITE);
paintBorder.setAntiAlias(true);
this.setLayerType(LAYER_TYPE_SOFTWARE, paintBorder);
paintBorder.setShadowLayer(4.0f, 0.0f, 2.0f, Color.WHITE);
}
public void setBorderWidth(int borderWidth)
{
this.borderWidth = borderWidth;
this.invalidate();
}
public void setBorderColor(int borderColor)
{
if (paintBorder != null)
paintBorder.setColor(borderColor);
this.invalidate();
}
private void loadBitmap()
{
BitmapDrawable bitmapDrawable = (BitmapDrawable) this.getDrawable();
if (bitmapDrawable != null)
image = bitmapDrawable.getBitmap();
}
@SuppressLint("DrawAllocation")
@Override
public void onDraw(Canvas canvas)
{
loadBitmap();
if (image != null)
{
shader = new BitmapShader(Bitmap.createScaledBitmap(image, canvas.getWidth(), canvas.getHeight(), false), Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
paint.setShader(shader);
int circleCenter = viewWidth / 2;
canvas.drawCircle(circleCenter + borderWidth, circleCenter + borderWidth, circleCenter + borderWidth - 4.0f, paintBorder);
canvas.drawCircle(circleCenter + borderWidth, circleCenter + borderWidth, circleCenter - 4.0f, paint);
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
int width = measureWidth(widthMeasureSpec);
int height = measureHeight(heightMeasureSpec, widthMeasureSpec);
viewWidth = width - (borderWidth * 2);
viewHeight = height - (borderWidth * 2);
setMeasuredDimension(width, height);
}
private int measureWidth(int measureSpec)
{
int result = 0;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
if (specMode == MeasureSpec.EXACTLY)
{
result = specSize;
}
else
{
// Measure the text
result = viewWidth;
}
return result;
}
private int measureHeight(int measureSpecHeight, int measureSpecWidth)
{
int result = 0;
int specMode = MeasureSpec.getMode(measureSpecHeight);
int specSize = MeasureSpec.getSize(measureSpecHeight);
if (specMode == MeasureSpec.EXACTLY)
{
result = specSize;
}
else
{
result = viewHeight;
}
return (result + 2);
}
}
然后在布局中使用这个ImageView:
<com.app.Demo.RoundedImageView
android:id="@+id/iv_profileImage"
android:layout_width="70dp"
android:layout_height="70dp"
android:layout_centerHorizontal="true"
/>