1 import android.content.Context;  2 import android.content.res.TypedArray;  3 import android.graphics.Bitmap;  4 import android.graphics.BitmapShader;  5 import android.graphics.Canvas;  6 import android.graphics.Color;  7 import android.graphics.Matrix;  8 import android.graphics.Paint;  9 import android.graphics.RectF; 10 import android.graphics.Shader; 11 import android.graphics.drawable.BitmapDrawable; 12 import android.graphics.drawable.ColorDrawable; 13 import android.graphics.drawable.Drawable; 14 import android.util.AttributeSet; 15 import android.widget.ImageView; 16  17   18 public class CircleImageView extends ImageView { 19  20     private static final ScaleType SCALE_TYPE = ScaleType.CENTER_CROP; 21  22     private static final Bitmap.Config BITMAP_CONFIG = Bitmap.Config.ARGB_8888; 23     private static final int COLORDRAWABLE_DIMENSION = 1; 24  25     private static final int DEFAULT_BORDER_WIDTH = 0; 26     private static final int DEFAULT_BORDER_COLOR = Color.BLACK; 27  28     private final RectF mDrawableRect = new RectF(); 29     private final RectF mBorderRect = new RectF(); 30  31     private final Matrix mShaderMatrix = new Matrix(); 32     private final Paint mBitmapPaint = new Paint(); 33     private final Paint mBorderPaint = new Paint(); 34  35     private int mBorderColor = DEFAULT_BORDER_COLOR; 36     private int mBorderWidth = DEFAULT_BORDER_WIDTH; 37  38     private Bitmap mBitmap; 39     private BitmapShader mBitmapShader; 40     private int mBitmapWidth; 41     private int mBitmapHeight; 42  43     private float mDrawableRadius; 44     private float mBorderRadius; 45  46     private boolean mReady; 47     private boolean mSetupPending; 48  49     public CircleImageView(Context context) { 50         super(context); 51     } 52  53     public CircleImageView(Context context, AttributeSet attrs) { 54         this(context, attrs, 0); 55     } 56  57     public CircleImageView(Context context, AttributeSet attrs, int defStyle) { 58         super(context, attrs, defStyle); 59         super.setScaleType(SCALE_TYPE); 60  61         TypedArray a = context.obtainStyledAttributes(attrs, 62                 R.styleable.CircleImageView, defStyle, 0); 63  64         mBorderWidth = a.getDimensionPixelSize( 65                 R.styleable.CircleImageView_border_width, DEFAULT_BORDER_WIDTH); 66         mBorderColor = a.getColor(R.styleable.CircleImageView_border_color, 67                 DEFAULT_BORDER_COLOR); 68  69         a.recycle(); 70  71         mReady = true; 72  73         if (mSetupPending) { 74             setup(); 75             mSetupPending = false; 76         } 77     } 78  79     @Override 80     public ScaleType getScaleType() { 81         return SCALE_TYPE; 82     } 83  84     @Override 85     public void setScaleType(ScaleType scaleType) { 86         if (scaleType != SCALE_TYPE) { 87             throw new IllegalArgumentException(String.format( 88                     "ScaleType %s not supported.", scaleType)); 89         } 90     } 91  92     @Override 93     protected void onDraw(Canvas canvas) { 94         if (getDrawable() == null) { 95             return; 96         } 97  98         canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius, 99                 mBitmapPaint);100         if (mBorderWidth != 0) {101             canvas.drawCircle(getWidth() / 2, getHeight() / 2, mBorderRadius,102                     mBorderPaint);103         }104     }105 106     @Override107     protected void onSizeChanged(int w, int h, int oldw, int oldh) {108         super.onSizeChanged(w, h, oldw, oldh);109         setup();110     }111 112     public int getBorderColor() {113         return mBorderColor;114     }115 116     public void setBorderColor(int borderColor) {117         if (borderColor == mBorderColor) {118             return;119         }120 121         mBorderColor = borderColor;122         mBorderPaint.setColor(mBorderColor);123         invalidate();124     }125 126     public int getBorderWidth() {127         return mBorderWidth;128     }129 130     public void setBorderWidth(int borderWidth) {131         if (borderWidth == mBorderWidth) {132             return;133         }134 135         mBorderWidth = borderWidth;136         setup();137     }138 139     @Override140     public void setImageBitmap(Bitmap bm) {141         super.setImageBitmap(bm);142         mBitmap = bm;143         setup();144     }145 146     @Override147     public void setImageDrawable(Drawable drawable) {148         super.setImageDrawable(drawable);149         mBitmap = getBitmapFromDrawable(drawable);150         setup();151     }152 153     @Override154     public void setImageResource(int resId) {155         super.setImageResource(resId);156         mBitmap = getBitmapFromDrawable(getDrawable());157         setup();158     }159 160     private Bitmap getBitmapFromDrawable(Drawable drawable) {161         if (drawable == null) {162             return null;163         }164 165         if (drawable instanceof BitmapDrawable) {166             return ((BitmapDrawable) drawable).getBitmap();167         }168 169         try {170             Bitmap bitmap;171 172             if (drawable instanceof ColorDrawable) {173                 bitmap = Bitmap.createBitmap(COLORDRAWABLE_DIMENSION,174                         COLORDRAWABLE_DIMENSION, BITMAP_CONFIG);175             } else {176                 bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),177                         drawable.getIntrinsicHeight(), BITMAP_CONFIG);178             }179 180             Canvas canvas = new Canvas(bitmap);181             drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());182             drawable.draw(canvas);183             return bitmap;184         } catch (OutOfMemoryError e) {185             return null;186         }187     }188 189     private void setup() {190         if (!mReady) {191             mSetupPending = true;192             return;193         }194 195         if (mBitmap == null) {196             return;197         }198 199         mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP,200                 Shader.TileMode.CLAMP);201 202         mBitmapPaint.setAntiAlias(true);203         mBitmapPaint.setShader(mBitmapShader);204 205         mBorderPaint.setStyle(Paint.Style.STROKE);206         mBorderPaint.setAntiAlias(true);207         mBorderPaint.setColor(mBorderColor);208         mBorderPaint.setStrokeWidth(mBorderWidth);209 210         mBitmapHeight = mBitmap.getHeight();211         mBitmapWidth = mBitmap.getWidth();212 213         mBorderRect.set(0, 0, getWidth(), getHeight());214         mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2,215                 (mBorderRect.width() - mBorderWidth) / 2);216 217         mDrawableRect.set(mBorderWidth, mBorderWidth, mBorderRect.width()218                 - mBorderWidth, mBorderRect.height() - mBorderWidth);219         mDrawableRadius = Math.min(mDrawableRect.height() / 2,220                 mDrawableRect.width() / 2);221 222         updateShaderMatrix();223         invalidate();224     }225 226     private void updateShaderMatrix() {227         float scale;228         float dx = 0;229         float dy = 0;230 231         mShaderMatrix.set(null);232 233         if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width()234                 * mBitmapHeight) {235             scale = mDrawableRect.height() / (float) mBitmapHeight;236             dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f;237         } else {238             scale = mDrawableRect.width() / (float) mBitmapWidth;239             dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f;240         }241 242         mShaderMatrix.setScale(scale, scale);243         mShaderMatrix.postTranslate((int) (dx + 0.5f) + mBorderWidth,244                 (int) (dy + 0.5f) + mBorderWidth);245 246         mBitmapShader.setLocalMatrix(mShaderMatrix);247     }248 249 }

1 <com.sample.CircleImageView2        android:layout_width="80dp"3        android:layout_height="80dp"4        android:layout_marginLeft="40dp"5        android:scaleType="centerCrop"6        android:src="@drawable/charming" />