android ImageView加圆角

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1.attrs添加

<declare-styleable name="RoundImageView">
<attr name="circle" format="boolean" />
<attr name="radius" format="dimension" />
</declare-styleable>

2.新增class

public class RoundImageView extends ImageView {
private Paint paint;
private Paint paintBorder;
private Bitmap mSrcBitmap;
/**
* 圆角的弧度
*/
private float mRadius;
private boolean mIsCircle; public RoundImageView(final Context context) {
this(context, null);
} public RoundImageView(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.RoundImageView);
mRadius = ta.getDimension(R.styleable.RoundImageView_radius, 0);
mIsCircle = ta.getBoolean(R.styleable.RoundImageView_circle, false);
int srcResource = attrs.getAttributeResourceValue(
"http://schemas.android.com/apk/res/android", "src", 0);
if (srcResource != 0)
mSrcBitmap = BitmapFactory.decodeResource(getResources(),
srcResource);
ta.recycle();
paint = new Paint();
paint.setAntiAlias(true);
paintBorder = new Paint();
paintBorder.setAntiAlias(true);
} @Override
public void onDraw(Canvas canvas) {
int width = canvas.getWidth() - getPaddingLeft() - getPaddingRight();
int height = canvas.getHeight() - getPaddingTop() - getPaddingBottom();
Bitmap image = drawableToBitmap(getDrawable());
if (mIsCircle) {
Bitmap reSizeImage = reSizeImageC(image, width, height);
canvas.drawBitmap(createCircleImage(reSizeImage, width, height),
getPaddingLeft(), getPaddingTop(), null); } else { Bitmap reSizeImage = reSizeImage(image, width, height);
canvas.drawBitmap(createRoundImage(reSizeImage, width, height),
getPaddingLeft(), getPaddingTop(), null);
}
} /**
* 画圆角
*
* @param source
* @param width
* @param height
* @return
*/
private Bitmap createRoundImage(Bitmap source, int width, int height) {
Paint paint = new Paint();
paint.setAntiAlias(true);
Bitmap target = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(target);
RectF rect = new RectF(0, 0, width, height);
canvas.drawRoundRect(rect, mRadius, mRadius, paint);
// 核心代码取两个图片的交集部分
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(source, 0, 0, paint);
return target;
} /**
* 画圆
*
* @param source
* @param width
* @param height
* @return
*/
private Bitmap createCircleImage(Bitmap source, int width, int height) { Paint paint = new Paint();
paint.setAntiAlias(true);
Bitmap target = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(target);
canvas.drawCircle(width / 2, height / 2, Math.min(width, height) / 2,
paint);
// 核心代码取两个图片的交集部分
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(source, (width - source.getWidth()) / 2,
(height - source.getHeight()) / 2, paint);
return target; } @Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
setMeasuredDimension(width, height);
} /**
* drawable转bitmap
*
* @param drawable
* @return
*/
private Bitmap drawableToBitmap(Drawable drawable) {
if (drawable == null) {
if (mSrcBitmap != null) {
return mSrcBitmap;
} else {
return null;
}
} else if (drawable instanceof BitmapDrawable) {
return ((BitmapDrawable) drawable).getBitmap();
}
Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
return bitmap;
} /**
* 重设Bitmap的宽高
*
* @param bitmap
* @param newWidth
* @param newHeight
* @return
*/
private Bitmap reSizeImage(Bitmap bitmap, int newWidth, int newHeight) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
// 计算出缩放比
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// 矩阵缩放bitmap
Matrix matrix = new Matrix(); matrix.postScale(scaleWidth, scaleHeight);
return Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
} /**
* 重设Bitmap的宽高
*
* @param bitmap
* @param newWidth
* @param newHeight
* @return
*/
private Bitmap reSizeImageC(Bitmap bitmap, int newWidth, int newHeight) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
int x = (newWidth - width) / 2;
int y = (newHeight - height) / 2;
if (x > 0 && y > 0) {
return Bitmap.createBitmap(bitmap, 0, 0, width, height, null, true);
} float scale = 1; if (width > height) {
// 按照宽度进行等比缩放
scale = ((float) newWidth) / width; } else {
// 按照高度进行等比缩放
// 计算出缩放比
scale = ((float) newHeight) / height;
}
Matrix matrix = new Matrix();
matrix.postScale(scale, scale);
return Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
}}