可以自定义圆角的ImageView ..允许设置scaletype

package com.cisetech.circleviewdemo; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.PorterDuff; import android.graphics.PorterDuffXfermode; import android.graphics.RectF; import android.graphics.Xfermode; import android.graphics.drawable.Drawable; import android.util.AttributeSet; import android.util.TypedValue; import android.widget.ImageView; import java.lang.ref.WeakReference; import java.lang.reflect.Method; /** * author：yinqingy * date：2016-10-09 21:14 * blog：http://blog.csdn.net/vv_bug * desc： */ public class CricleXfexrmode extends ImageView { /** * 默认圆角半径 */ public static final int DEFAULT_RADIUS = 10; /** * 圆形 */ public static final int TYPE_CIRCLE = 0; /** * 圆角 */ public static final int TYPE_ROUND = 1; /** * 图片的类型，圆形or圆角 */ private int mType = TYPE_CIRCLE; /** * 圆角半径 */ private int mRadius = DEFAULT_RADIUS; /** * 弱引用 */ private WeakReference<Bitmap> mWeakBitmap; private Paint mPaint; private Xfermode mXfermode = new PorterDuffXfermode(PorterDuff.Mode.DST_IN); private Bitmap mMaskBitmap; public CricleXfexrmode(Context context) { this(context, null); } public CricleXfexrmode(Context context, AttributeSet attrs) { this(context, attrs, 0); } public CricleXfexrmode(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); obtainStyleAttr(context, attrs, defStyleAttr); mPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG); } /** * 获取attr */ private void obtainStyleAttr(Context context, AttributeSet set, int defStyleAttr) { TypedArray a = context.obtainStyledAttributes(set, R.styleable.CricleXfexrmode, defStyleAttr, 0); mRadius = a.getDimensionPixelSize(R.styleable.CricleXfexrmode_borderRadius, dp2px(DEFAULT_RADIUS)); mType = a.getInteger(R.styleable.CricleXfexrmode_type, mType); a.recycle(); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); } @Override protected void onDraw(Canvas canvas) { Bitmap bitmap = mWeakBitmap == null ? null : mWeakBitmap.get(); if (bitmap == null || bitmap.isRecycled()) { //获取Drawable Drawable drawable = getDrawable(); if (drawable != null) { bitmap = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888); Matrix matrix=null; Canvas dstCanvas = new Canvas(bitmap); dstCanvas.save(); if (getScaleType()==ScaleType.FIT_XY){ drawable.setBounds(0,0,getWidth(),getHeight()); matrix=null; }else{ matrix=new Matrix(); getMatric(drawable,matrix); } if(matrix!=null){ dstCanvas.concat(matrix); } drawable.draw(dstCanvas); dstCanvas.restore(); if (mMaskBitmap == null || mMaskBitmap.isRecycled()) { mMaskBitmap = getBitmap(); } mPaint.reset(); mPaint.setFilterBitmap(false); mPaint.setXfermode(mXfermode); dstCanvas.drawBitmap(mMaskBitmap, 0, 0, mPaint); mPaint.setXfermode(null); canvas.drawBitmap(bitmap, 0, 0, null); mWeakBitmap = new WeakReference<Bitmap>(bitmap); } } else if (bitmap != null) { mPaint.setXfermode(null); canvas.drawBitmap(bitmap, 0.0f, 0.0f, mPaint); } } private Bitmap getBitmap() { Bitmap bitmap =null; bitmap= Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(bitmap); Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); paint.setColor(Color.BLACK); if (TYPE_CIRCLE == mType) { canvas.drawCircle(canvas.getWidth() / 2, canvas.getHeight() / 2, canvas.getWidth() / 2, paint); } else { canvas.drawRoundRect(new RectF(0, 0, canvas.getWidth(), canvas.getHeight()), mRadius, mRadius, paint); } return bitmap; } @Override public void invalidate() { mWeakBitmap = null; if (mMaskBitmap != null) { mMaskBitmap.recycle(); mMaskBitmap = null; } super.invalidate(); } /** * dp2px * @param value * @return px */ private int dp2px(int value) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, value, getContext().getResources().getDisplayMetrics()); } private void getMatric(Drawable drawable, Matrix matrix) { ScaleType mScaleType = getScaleType(); //获取图片的宽高 int dwidth = drawable.getIntrinsicWidth(); int dheight = drawable.getIntrinsicHeight(); int vwidth =getWidth(); int vheight = getHeight(); if (ScaleType.MATRIX == mScaleType) { ///// } else if (ScaleType.CENTER_CROP == mScaleType) { float scale; float dx = 0, dy = 0; if (dwidth * vheight > vwidth * dheight) { scale = (float) vheight / (float) dheight; dx = (vwidth - dwidth * scale) * 0.5f; } else { scale = (float) vwidth / (float) dwidth; dy = (vheight - dheight * scale) * 0.5f; } matrix.setScale(scale, scale); matrix.postTranslate(Math.round(dx), Math.round(dy)); } else if (ScaleType.CENTER_INSIDE == mScaleType) { float scale; float dx; float dy; if (dwidth <= vwidth && dheight <= vheight) { scale = 1.0f; } else { scale = Math.min((float) vwidth / (float) dwidth, (float) vheight / (float) dheight); } dx = Math.round((vwidth - dwidth * scale) * 0.5f); dy = Math.round((vheight - dheight * scale) * 0.5f); matrix.setScale(scale, scale); matrix.postTranslate(dx, dy); } else { matrix.setRectToRect(new RectF(drawable.getBounds()), new RectF(0, 0, getWidth(), getHeight()), scaleTypeToScaleToFit(mScaleType)); } } private Matrix.ScaleToFit scaleTypeToScaleToFit(ScaleType mScaleType) { Class mClass=ImageView.class; try { Method method = mClass.getDeclaredMethod("scaleTypeToScaleToFit", new Class[]{ScaleType.class}); method.setAccessible(true); if(method!=null){ Matrix.ScaleToFit fit = (Matrix.ScaleToFit) (method.invoke(null, new Object[]{mScaleType})); return fit; } } catch (Exception e) { e.printStackTrace(); } return Matrix.ScaleToFit.FILL; } }