1，先建立一個Util類
public class RoundishImageViewextends android.support.v7.widget.AppCompatImageView {
public static final int CORNER_NONE =0;
public static final int CORNER_TOP_LEFT =1;
public static final int CORNER_TOP_RIGHT =2;
public static final int CORNER_BOTTOM_RIGHT =4;
public static final int CORNER_BOTTOM_LEFT =8;
public static final int CORNER_ALL =15;
private static final int[]CORNERS = {CORNER_TOP_LEFT,
CORNER_TOP_RIGHT,
CORNER_BOTTOM_RIGHT,
CORNER_BOTTOM_LEFT};
private final Pathpath =new Path();
private int cornerRadius;
private int roundedCorners;
public RoundishImageView(Context context) {
this(context,null);
}
public RoundishImageView(Context context, AttributeSet attrs) {
this(context, attrs,0);
}
public RoundishImageView(Context context, AttributeSet attrs,int defStyleAttr) {
super(context, attrs, defStyleAttr);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.RoundishImageView);
cornerRadius = a.getDimensionPixelSize(R.styleable.RoundishImageView_cornerRadius,0);
roundedCorners = a.getInt(R.styleable.RoundishImageView_roundedCorners,CORNER_NONE);
a.recycle();
}
public int getCornerRadius() {
return cornerRadius;
}
public void setCornerRadius(int radius) {
if (cornerRadius != radius) {
cornerRadius = radius;
setPath();
invalidate();
}
}
public void setRoundedCorners(int corners) {
if (roundedCorners != corners) {
roundedCorners = corners;
setPath();
invalidate();
}
}
public boolean isCornerRounded(int corner) {
return (roundedCorners & corner) == corner;
}
@Override
? ? protected void onDraw(Canvas canvas) {
if (!path.isEmpty()) {
canvas.clipPath(path);
}
super.onDraw(canvas);
}
@Override
? ? protected void onSizeChanged(int w,int h,int oldw,int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
setPath();
}
private void setPath() {
path.rewind();
if (cornerRadius >=1f &&roundedCorners !=CORNER_NONE) {
final float[] radii =new float[8];
for (int i =0; i <4; i++) {
if (isCornerRounded(CORNERS[i])) {
radii[2 * i] =cornerRadius;
radii[2 * i +1] =cornerRadius;
}
}
path.addRoundRect(new RectF(0,0, getWidth(), getHeight()),
radii, Path.Direction.CW);
}
}
}
2，第二布加入
<declare-styleable name="RoundishImageView">
? ? ? ? <attr name="cornerRadius" format="dimension" />
? ? ? ? <attr name="roundedCorners">
? ? ? ? ? ? <flag name="topLeft" value="1" />
? ? ? ? ? ? <flag name="topRight" value="2" />
? ? ? ? ? ? <flag name="bottomRight" value="4" />
? ? ? ? ? ? <flag name="bottomLeft" value="8" />
? ? ? ? ? ? <flag name="all" value="15" />
? ? ? ? </attr>
? ? </declare-styleable>
第三步就可以用了。
<a.b.ImageView
? ? android:id="@+id/service_image"
? ? android:layout_width="94dp"
? ? android:layout_height="94dp"
? ? android:scaleType="centerCrop"
? ? android:src="@mipmap/bg_center_top"
? ? app:cornerRadius="5dp"
? ? app:roundedCorners="topLeft|topRight" />
