适用于Glide可以任意设置某个角为圆角的 ImageView
作者：互联网
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.RectF;
import android.graphics.Xfermode;
import android.os.Build;
import android.util.AttributeSet;
import android.util.Log;
import androidx.annotation.ColorInt;
import androidx.annotation.Nullable;
import androidx.appcompat.widget.AppCompatImageView;
/**
* 圆角、圆形、带边框 各种图片
*/
public class NiceImageView extends AppCompatImageView {
private Context context;
private boolean isCircle; // 是否显示为圆形，如果为圆形则设置的corner无效
private boolean isCoverSrc; // border、inner_border是否覆盖图片
private int borderWidth; // 边框宽度
private int borderColor = Color.WHITE; // 边框颜色
private int innerBorderWidth; // 内层边框宽度
private int innerBorderColor = Color.WHITE; // 内层边框充色
private int cornerRadius; // 统一设置圆角半径，优先级高于单独设置每个角的半径
private int cornerTopLeftRadius; // 左上角圆角半径
private int cornerTopRightRadius; // 右上角圆角半径
private int cornerBottomLeftRadius; // 左下角圆角半径
private int cornerBottomRightRadius; // 右下角圆角半径
private int maskColor; // 遮罩颜色
private Xfermode xfermode;
private int width;
private int height;
private float radius;
private float[] borderRadii;
private float[] srcRadii;
private RectF srcRectF; // 图片占的矩形区域
private RectF borderRectF; // 边框的矩形区域
private Paint paint;
private Path path; // 用来裁剪图片的ptah
private Path srcPath; // 图片区域大小的path
private OnDrawListener onDrawListener;
public void setOnDrawListener(OnDrawListener onDrawListener) {
this.onDrawListener = onDrawListener;
}
public NiceImageView(Context context) {
this(context, null);
}
public NiceImageView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public NiceImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.context = context;
TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.NiceImageView, 0, 0);
for (int i = 0; i < ta.getIndexCount(); i++) {
int attr = ta.getIndex(i);
if (attr == R.styleable.NiceImageView_is_cover_src) {
isCoverSrc = ta.getBoolean(attr, isCoverSrc);
} else if (attr == R.styleable.NiceImageView_is_circle) {
isCircle = ta.getBoolean(attr, isCircle);
} else if (attr == R.styleable.NiceImageView_border_width) {
borderWidth = ta.getDimensionPixelSize(attr, borderWidth);
} else if (attr == R.styleable.NiceImageView_border_color) {
borderColor = ta.getColor(attr, borderColor);
} else if (attr == R.styleable.NiceImageView_inner_border_width) {
innerBorderWidth = ta.getDimensionPixelSize(attr, innerBorderWidth);
} else if (attr == R.styleable.NiceImageView_inner_border_color) {
innerBorderColor = ta.getColor(attr, innerBorderColor);
} else if (attr == R.styleable.NiceImageView_corner_radius) {
cornerRadius = ta.getDimensionPixelSize(attr, cornerRadius);
} else if (attr == R.styleable.NiceImageView_corner_top_left_radius) {
cornerTopLeftRadius = ta.getDimensionPixelSize(attr, cornerTopLeftRadius);
} else if (attr == R.styleable.NiceImageView_corner_top_right_radius) {
cornerTopRightRadius = ta.getDimensionPixelSize(attr, cornerTopRightRadius);
} else if (attr == R.styleable.NiceImageView_corner_bottom_left_radius) {
cornerBottomLeftRadius = ta.getDimensionPixelSize(attr, cornerBottomLeftRadius);
} else if (attr == R.styleable.NiceImageView_corner_bottom_right_radius) {
cornerBottomRightRadius = ta.getDimensionPixelSize(attr, cornerBottomRightRadius);
} else if (attr == R.styleable.NiceImageView_mask_color) {
maskColor = ta.getColor(attr, maskColor);
}
}
ta.recycle();
borderRadii = new float[8];
srcRadii = new float[8];
borderRectF = new RectF();
srcRectF = new RectF();
paint = new Paint();
path = new Path();
if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.O_MR1) {
xfermode = new PorterDuffXfermode(PorterDuff.Mode.DST_IN);
} else {
xfermode = new PorterDuffXfermode(PorterDuff.Mode.DST_OUT);
srcPath = new Path();
}
calculateRadii();
clearInnerBorderWidth();
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
width = w;
height = h;
initBorderRectF();
initSrcRectF();
invalidate();
Log.d(TAG, "--onSizeChanged--width--" + width +"--height--"+height);
}
boolean isDrawed = false;
private static final String TAG = "NiceImageView--";
@Override
protected void onDraw(Canvas canvas) {
Log.d(TAG, "--onDraw--" + cornerRadius);
// 使用图形混合模式来显示指定区域的图片
canvas.saveLayer(srcRectF, null, Canvas.ALL_SAVE_FLAG);
if (!isCoverSrc) {
float sx = 1.0f * (width - 2 * borderWidth - 2 * innerBorderWidth) / width;
float sy = 1.0f * (height - 2 * borderWidth - 2 * innerBorderWidth) / height;
// 缩小画布，使图片内容不被borders覆盖
canvas.scale(sx, sy, width / 2.0f, height / 2.0f);
}
super.onDraw(canvas);
paint.reset();
path.reset();
if (isCircle) {
path.addCircle(width / 2.0f, height / 2.0f, radius, Path.Direction.CCW);
} else {
path.addRoundRect(srcRectF, srcRadii, Path.Direction.CCW);
}
paint.setAntiAlias(true);
paint.setStyle(Paint.Style.FILL);
paint.setXfermode(xfermode);
if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.O_MR1) {
canvas.drawPath(path, paint);
} else {
srcPath.reset();
srcPath.addRect(srcRectF, Path.Direction.CCW);
// 计算tempPath和path的差集
srcPath.op(path, Path.Op.DIFFERENCE);
canvas.drawPath(srcPath, paint);
}
paint.setXfermode(null);
// 绘制遮罩
if (maskColor != 0) {
paint.setColor(maskColor);
canvas.drawPath(path, paint);
}
// // 恢复画布
canvas.restore();
// // 绘制边框
drawBorders(canvas);
if (onDrawListener != null) onDrawListener.doOnDraw();
}
private void drawBorders(Canvas canvas) {
if (isCircle) {
if (borderWidth > 0) {
drawCircleBorder(canvas, borderWidth, borderColor, radius - borderWidth / 2.0f);
}
if (innerBorderWidth > 0) {
drawCircleBorder(canvas, innerBorderWidth, innerBorderColor, radius - borderWidth - innerBorderWidth / 2.0f);
}
} else {
if (borderWidth > 0) {
drawRectFBorder(canvas, borderWidth, borderColor, borderRectF, borderRadii);
}
}
}
private void drawCircleBorder(Canvas canvas, int borderWidth, int borderColor, float radius) {
initBorderPaint(borderWidth, borderColor);
path.addCircle(width / 2.0f, height / 2.0f, radius, Path.Direction.CCW);
canvas.drawPath(path, paint);
}
private void drawRectFBorder(Canvas canvas, int borderWidth, int borderColor, RectF rectF, float[] radii) {
initBorderPaint(borderWidth, borderColor);
path.addRoundRect(rectF, radii, Path.Direction.CCW);
canvas.drawPath(path, paint);
}
private void initBorderPaint(int borderWidth, int borderColor) {
path.reset();
paint.setStrokeWidth(borderWidth);
paint.setColor(borderColor);
paint.setStyle(Paint.Style.STROKE);
}
/**
* 计算外边框的RectF
*/
private void initBorderRectF() {
if (!isCircle) {
borderRectF.set(borderWidth / 2.0f, borderWidth / 2.0f, width - borderWidth / 2.0f, height - borderWidth / 2.0f);
}
}
/**
* 计算图片原始区域的RectF
*/
private void initSrcRectF() {
if (isCircle) {
radius = Math.min(width, height) / 2.0f;
srcRectF.set(width / 2.0f - radius, height / 2.0f - radius, width / 2.0f + radius, height / 2.0f + radius);
} else {
srcRectF.set(0, 0, width, height);
if (isCoverSrc) {
srcRectF = borderRectF;
}
}
}
/**
* 计算RectF的圆角半径
*/
private void calculateRadii() {
if (isCircle) {
return;
}
if (cornerRadius > 0) {
for (int i = 0; i < borderRadii.length; i++) {
borderRadii[i] = cornerRadius;
srcRadii[i] = cornerRadius - borderWidth / 2.0f;
}
} else {
borderRadii[0] = borderRadii[1] = cornerTopLeftRadius;
borderRadii[2] = borderRadii[3] = cornerTopRightRadius;
borderRadii[4] = borderRadii[5] = cornerBottomRightRadius;
borderRadii[6] = borderRadii[7] = cornerBottomLeftRadius;
srcRadii[0] = srcRadii[1] = cornerTopLeftRadius - borderWidth / 2.0f;
srcRadii[2] = srcRadii[3] = cornerTopRightRadius - borderWidth / 2.0f;
srcRadii[4] = srcRadii[5] = cornerBottomRightRadius - borderWidth / 2.0f;
srcRadii[6] = srcRadii[7] = cornerBottomLeftRadius - borderWidth / 2.0f;
}
}
private void calculateRadiiAndRectF(boolean reset) {
if (reset) {
cornerRadius = 0;
}
calculateRadii();
initBorderRectF();
invalidate();
}
/**
* 目前圆角矩形情况下不支持inner_border，需要将其置0
*/
private void clearInnerBorderWidth() {
if (!isCircle) {
this.innerBorderWidth = 0;
}
}
public void isCoverSrc(boolean isCoverSrc) {
this.isCoverSrc = isCoverSrc;
initSrcRectF();
invalidate();
}
public void isCircle(boolean isCircle) {
this.isCircle = isCircle;
clearInnerBorderWidth();
initSrcRectF();
invalidate();
}
public void setBorderWidth(int borderWidth) {
this.borderWidth = dip2px(context, borderWidth);
calculateRadiiAndRectF(false);
}
public void setBorderColor(@ColorInt int borderColor) {
this.borderColor = borderColor;
invalidate();
}
public void setInnerBorderWidth(int innerBorderWidth) {
this.innerBorderWidth = dip2px(context, innerBorderWidth);
clearInnerBorderWidth();
invalidate();
}
public void setInnerBorderColor(@ColorInt int innerBorderColor) {
this.innerBorderColor = innerBorderColor;
invalidate();
}
public void setCornerRadius(int cornerRadiusDP) {
this.cornerRadius = dip2px(context, cornerRadiusDP);
invalidateOutline();
calculateRadiiAndRectF(false);
}
public void setCornerTopLeftRadius(int cornerTopLeftRadius) {
this.cornerTopLeftRadius = dip2px(context, cornerTopLeftRadius);
calculateRadiiAndRectF(true);
}
public void setCornerTopRightRadius(int cornerTopRightRadius) {
this.cornerTopRightRadius = dip2px(context, cornerTopRightRadius);
calculateRadiiAndRectF(true);
}
public void setCornerBottomLeftRadius(int cornerBottomLeftRadius) {
this.cornerBottomLeftRadius = dip2px(context, cornerBottomLeftRadius);
calculateRadiiAndRectF(true);
}
public void setCornerBottomRightRadius(int cornerBottomRightRadius) {
this.cornerBottomRightRadius = dip2px(context, cornerBottomRightRadius);
calculateRadiiAndRectF(true);
}
public void setMaskColor(@ColorInt int maskColor) {
this.maskColor = maskColor;
invalidate();
}
public interface OnDrawListener {
void doOnDraw();
}
/**
* 根据手机的分辨率从 dp 的单位 转成为 px(像素)
*/
public static int dip2px(Context context, float dpValue) {
if (context == null || dpValue == 0) return 0;
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
}
<declare-styleable name="NiceImageView">
<attr name="is_circle" format="boolean" />
<attr name="is_cover_src" format="boolean" />
<attr name="corner_radius" format="dimension" />
<attr name="corner_top_left_radius" format="dimension" />
<attr name="corner_top_right_radius" format="dimension" />
<attr name="corner_bottom_left_radius" format="dimension" />
<attr name="corner_bottom_right_radius" format="dimension" />
<attr name="border_width" format="dimension" />
<attr name="border_color" format="color" />
<attr name="inner_border_width" format="dimension" />
<attr name="inner_border_color" format="color" />
<attr name="mask_color" format="color" />
</declare-styleable><NiceImageView
android:id="@+id/iv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="72dp"
android:src="@mipmap/image"
app:corner_radius="20dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.568"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"/>标签：attr,Glide,int,void,private,角为,context,ImageView,borderWidth 来源： https://blog.csdn.net/u013327645/article/details/119329114