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Android实现动态圆环的图片头像控件

2022-06-06 06:59

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先看效果图：

现在大部分的app上难免会使用到圆形头像，所以今天我给大家分享一个单独使用的，并且周围带有圆环动画的花哨圆形头像控件，本控件是在圆形头像控件基础上实现的，只是在其周围再画一些不同大小的圆而已，就可以实现如图的效果。

圆形头像的基本原理是将设置的资源文件转化成Bitmap,然后通过BitmapShader类将Bitmap成为Paint的渲染器，然后在onDraw()中通过canvas.drawCircle(rx,ry,radius,paint);画布上画圆，而这个圆就是形成了圆形头像。

在xml中通过src设置的资源文件在ImageView的setImageDrawable(drawable)方法中可以得到Drawable类型的图像，然后再将Drawable转成Bitmap就可以了


public void setImageDrawable(Drawable drawable) { 
  super.setImageDrawable(drawable); 
  mBitmap = getBitmapFromDrawable(drawable); 
  setup(); 
} 
private Bitmap getBitmapFromDrawable(Drawable drawable) { 
  if (drawable == null) { 
   return null; 
  } 
  if (drawable instanceof BitmapDrawable) { 
   //从bitmap中间裁剪出最大的正方形 
   Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap(); 
   return getMaxSquareCenter(bitmap); 
   //return ((BitmapDrawable) drawable).getBitmap(); 
  } 
  try { 
   Bitmap bitmap; 
   if (drawable instanceof ColorDrawable) { 
    bitmap = Bitmap.createBitmap(COLORDRAWABLE_DIMENSION, COLORDRAWABLE_DIMENSION, BITMAP_CONFIG); 
   } else { 
    int min = Math.min(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight()); 
    bitmap = Bitmap.createBitmap(min, min, BITMAP_CONFIG); 
   } 
   Canvas canvas = new Canvas(bitmap); 
   int left,top,right,buttom; 
   int width = canvas.getWidth(); 
   int height = canvas.getHeight(); 
   int abs = Math.abs(width - height); 
   if(width <= height){ 
    left = 0; 
    top = (height - abs) / 2; 
    right = width; 
    buttom = height - top; 
   }else{ 
    left = (width - abs) / 2; 
    top = 0; 
    right = width - left; 
    buttom = height; 
   } 
   //drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight()); 
   drawable.setBounds(left, top, right, buttom); 
   drawable.draw(canvas); 
   return bitmap; 
  } catch (OutOfMemoryError e) { 
   return null; 
  } 
 } 
 
 private Bitmap getMaxSquareCenter(Bitmap bitmap){ 
  int w = bitmap.getWidth(); // 得到图片的宽，高 
  int h = bitmap.getHeight(); 
  int cropWidth = w >= h ? h : w;// 裁切后所取的正方形区域边长 
  return Bitmap.createBitmap(bitmap, (w - cropWidth)/2 , (h - cropWidth)/2, cropWidth, cropWidth, null, false); 
 }

获取到Bitmap对象后就可以将Bitmap缩小一倍后，在将其画在画布上，这样就有地方来画周围的圆环了。


private void updateShaderMatrix() { 
  float scale; 
  float dx = 0; 
  float dy = 0; 
  mShaderMatrix.set(null); 
  if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width() * mBitmapHeight) { 
   scale = mDrawableRect.height() / (float) mBitmapHeight / 2; //将图片缩放在正中间 缩小一倍 
   dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f; 
  } else { 
   scale = mDrawableRect.width() / (float) mBitmapWidth / 2; //将图片缩放在正中间 缩小一倍 
   dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f; 
  } 
  mShaderMatrix.setScale(scale , scale ); 
 //在x轴上平移mDrawableRadius，就在正中间了 
  mShaderMatrix.postTranslate((int) (dx + 0.5f) + mBorderWidth + mDrawableRadius, (int) (dy + 0.5f) + mBorderWidth); 
  mBitmapShader.setLocalMatrix(mShaderMatrix); 
 }

下面就是画图片周围的圆环了，就是在图片的外围画两个圆，一个半径大点，颜色浅点，一个半径小点，颜色深点就可以了，然后通过Handler通过延时操作，不断的改变两个圆的半径大小和颜色的深浅，重绘就可以了


 private float mChangeRateBorder;//记录外圆执行动画时半径变化率 
 private float mChangeRateOuter;//记录内圆执行动画时半径变化率 
 private float mChangeRateInner;//记录图片边框执行动画时半径变化率 
 private float mChangeRange;//变化范围，View半径的1/6 
// 
 //外圆执行动画时半径变化率 
 private float mRateOuter[] = { 
   -1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 
   0,0.1f,0.2f,0.3f,0.4f,0.5f,0.6f,0.7f,0.8f,0.9f,1.0f 
   ,0.92f,0.88f,0.85f,0.82f,0.76f,0.72f,0.68f,0.60f,0.54f,0.48f, 
   0.40f,0.33f,0.28f,0.20f}; 
 //内圆执行动画时半径变化率 
 private float mRateInner[] = { 
   -1,-1,-1,-1,-1, 
   0,0.1f,0.2f,0.3f,0.4f,0.5f,0.6f,0.7f,0.8f,0.9f,1.0f 
   ,0.92f,0.88f,0.84f,0.80f,0.72f,0.67f,0.60f,0.54f,0.48f,-1f 
   ,-1f,-1f,-1f,-1f,-1f,-1f,-1f,-1f,-1f}; 
 //图片边框执行动画时半径变化率 
 private float mRateBorder[] = { 
   0,0.1f,0.2f,0.3f,0.4f,0.5f,0.6f,0.7f,0.8f,0.9f,1.0f 
   ,0.92f,0.90f,0.84f,0.78f,0.72f,0.64f,0.58f,-1f,-1f,-1f 
   ,-1f,-1f,-1f,-1f,-1f,-1f,-1f,-1f,-1f,-1f 
   ,-1f,-1f,-1f,-1f}; 
 private int mRateIndex;//动画变化率的索引

Handler不断改变半径的变化率和画笔的颜色


 
 private Handler mHandler = new Handler(){ 
  @Override 
  public void handleMessage(Message msg) { 
   super.handleMessage(msg); 
   int index = mRateIndex ++; 
   mChangeRateBorder = mRateBorder[(index)% mRateBorder.length]; 
   setPaintCorlor(mBorderPaint,mChangeRateBorder,DEFAULT_BORDER_COLOR); 
   setPaintAlpha(mBorderPaint,(index)% mRateBorder.length,mRateBorder); 
   mChangeRateOuter = mRateOuter[(index) % mRateOuter.length]; 
   setPaintCorlor(mOuterPaint,mChangeRateOuter,mOuterPaintColor); 
   setPaintAlpha(mOuterPaint,(index) % mRateOuter.length,mRateOuter); 
   mChangeRateInner = mRateInner[(index) % mRateInner.length]; 
   setPaintCorlor(mInnerPaint,mChangeRateInner,mInnerPaintColor); 
   setPaintAlpha(mInnerPaint,(index) % mRateInner.length,mRateInner); 
   //System.out.println("---------mChangeRate:"+mChangeRateBorder); 
   invalidate(); 
   mHandler.removeCallbacksAndMessages(null); 
   mHandler.sendEmptyMessageDelayed(0,30); 
  } 
 };

每执行一次handleMessage()就会触发（invalidate()）View重绘，onDraw中不断的重绘，只需改变每个Circle的半径即可


@Override 
 protected void onDraw(Canvas canvas) { 
  if (getDrawable() == null) { 
   return; 
  } 
  //画动画的图形 
  canvas.drawCircle(getWidth() / 2,getHeight() / 2,getChangeRadiusOuter(mOuterRadius),mOuterPaint); 
  canvas.drawCircle(getWidth() / 2,getHeight() / 2,getChangeRadiusInner(mInnerRadius),mInnerPaint); 
  canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius, mBitmapPaint); 
  canvas.drawCircle(getWidth() / 2, getHeight() / 2, getChangeRadiusBorder(mBorderRadius), mBorderPaint); 
 }

根据Handler中给的变化率来计算每个Circle的半径


private float getChangeRadiusBorder(float radius){ 
  return mChangeRateBorder * mChangeRange + radius; 
 } 
 private float getChangeRadiusOuter(float radius){ 
  return mChangeRateOuter * mChangeRange + radius; 
 } 
 private float getChangeRadiusInner(float radius){ 
  return mChangeRateInner * mChangeRange + radius; 
 }

这样在不断的向Handler发送消息时，也就会不断的触发重绘，不断改变外围圆的大小，形成上图所见的动画效果
如下四个方法，就是来控制圆环所展示的不同状态


 
 public void startAnim(){ 
 //让外围的圆环动起来 
  mHandler.sendEmptyMessageDelayed(0,30); 
 } 
  
 public void stopAnim(){ 
 //停止外圆环的动画，展示默认的大小 
  mHandler.removeCallbacksAndMessages(null); 
  mChangeRateBorder = 0; 
  mChangeRateOuter = 0; 
  mChangeRateInner = 0; 
  initAnimColor(); 
  enterAnim(); 
 } 
  
 public void enterAnim(){ 
 //展示外圆环，显示默认大小 
  mHandlerEnter.sendEmptyMessage(0); 
 } 
  
 public void exitAnim(){ 
 //隐藏外圆环 
  mHandlerExit.sendEmptyMessage(0); 
 }

好了，动态头像到这基本就实现了，进入动画和退出动画的代码就不贴出来分析了，如果发现bug或者有任何意见欢迎留言。

完整源码 


import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.BitmapShader; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Matrix; 
import android.graphics.Paint; 
import android.graphics.RectF; 
import android.graphics.Shader; 
import android.graphics.drawable.BitmapDrawable; 
import android.graphics.drawable.ColorDrawable; 
import android.graphics.drawable.Drawable; 
import android.os.Handler; 
import android.os.Message; 
import android.util.AttributeSet; 
import android.widget.ImageView; 
 
public class DynamicAvatarView extends ImageView { 
 private static final ScaleType SCALE_TYPE = ScaleType.CENTER_CROP; 
 private static final int COLORDRAWABLE_DIMENSION = 1; 
 private static final Bitmap.Config BITMAP_CONFIG = Bitmap.Config.ARGB_8888; 
 private Bitmap mBitmap; 
 private BitmapShader mBitmapShader; 
 private final Matrix mShaderMatrix = new Matrix(); 
 private final Paint mBitmapPaint = new Paint(); 
 private final Paint mBorderPaint = new Paint(); 
 private final Paint mOuterPaint = new Paint(); 
 private final Paint mInnerPaint = new Paint(); 
 private static final int DEFAULT_BORDER_WIDTH = 3; 
 private static final int DEFAULT_BORDER_COLOR = Color.WHITE; 
 private static final int OUTER_PAINT_COLOR = Color.parseColor("#55FFFFFF"); 
 private static final int INNER_PAINT_COLOR = Color.parseColor("#66FFFFFF"); 
 private int mBorderColor = DEFAULT_BORDER_COLOR; 
 private int mBorderWidth = DEFAULT_BORDER_WIDTH; 
 private int mOuterPaintColor = OUTER_PAINT_COLOR; 
 private int mInnerPaintColor = INNER_PAINT_COLOR; 
 private int mBitmapWidth; 
 private int mBitmapHeight; 
 private final RectF mDrawableRect = new RectF(); 
 private final RectF mBorderRect = new RectF(); 
 private float mDrawableRadius;//显示的图片 
 private float mBorderRadius;//..//显示的图片上的边框 
 private float mOuterRadius;//外层动画 
 private float mInnerRadius;//..//内层动画 
 private float mRealDrawableRadius;//这是View没有被缩放之前的mDrawableRadius的半径 
 private float mRealBorderRadius;//.. 
 private boolean mReady; 
 private boolean mSetupPending; 
 private float mChangeRateBorder;//记录外圆执行动画时半径变化率 
 private float mChangeRateOuter;//记录内圆执行动画时半径变化率 
 private float mChangeRateInner;//记录图片边框执行动画时半径变化率 
 private float mChangeRange;//变化范围，View半径的1/6 
 // 
 //外圆执行动画时半径变化率 
 private float mRateOuter[] = { 
   -1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 
   0,0.1f,0.2f,0.3f,0.4f,0.5f,0.6f,0.7f,0.8f,0.9f,1.0f 
   ,0.92f,0.88f,0.85f,0.82f,0.76f,0.72f,0.68f,0.60f,0.54f,0.48f, 
   0.40f,0.33f,0.28f,0.20f}; 
 //内圆执行动画时半径变化率 
 private float mRateInner[] = { 
   -1,-1,-1,-1,-1, 
   0,0.1f,0.2f,0.3f,0.4f,0.5f,0.6f,0.7f,0.8f,0.9f,1.0f 
   ,0.92f,0.88f,0.84f,0.80f,0.72f,0.67f,0.60f,0.54f,0.48f,-1f 
   ,-1f,-1f,-1f,-1f,-1f,-1f,-1f,-1f,-1f}; 
 //图片边框执行动画时半径变化率 
 private float mRateBorder[] = { 
   0,0.1f,0.2f,0.3f,0.4f,0.5f,0.6f,0.7f,0.8f,0.9f,1.0f 
   ,0.92f,0.90f,0.84f,0.78f,0.72f,0.64f,0.58f,-1f,-1f,-1f 
   ,-1f,-1f,-1f,-1f,-1f,-1f,-1f,-1f,-1f,-1f 
   ,-1f,-1f,-1f,-1f}; 
 //private int mColor[] = {0x55FFFFFF,0x44FFFFFF,0x33FFFFFF,0x22FFFFFF,0x11FFFFFF,0x00FFFFFF,0x00FFFFFF,0x00FFFFFF,0x00FFFFFF,0x00FFFFFF}; 
 private int mRateIndex;//动画变化率的索引 
 // 
 //外圆执行动画时半径变化率 
 private float mRateOuterEnter[] = { 
   -2,-2,//外圆要缩小2个mChangeRange才会完全隐藏 
   -2,-2,-2,-2,-2, 
   -0.8f,-0.6f,-0.4f,-0.2f,-0.1f, 
   0,0.1f,0.2f,0.3f,0.4f,0.5f 
   ,0.44f,0.4f,0.35f,0.3f,0.25f 
   ,0.20f,0.15f,0.1f,0.0f}; 
 //内圆执行动画时半径变化率 
 private float mRateInnerEnter[] = { 
   -1,-1,//外圆要缩小1个mChangeRange才会完全隐藏 
   -0.8f,-0.6f,-0.4f,-0.2f,-0.1f, 
   0,0.1f,0.2f,0.3f,0.35f,0.4f 
   ,0.45f,0.5f,0.45f,0.4f,0.35f 
   ,0.3f,0.25f,0.2f,0.15f,0.1f 
   ,0.05f,0f,0f,0f}; 
 private int mRateIndexEnter;//进入动画变化率的索引 
 // 
 //外圆执行动画时半径变化率 
 private float mRateOuterExit[] = { 
   0.0f,-0.2f,-0.4f,-0.6f,-0.8f 
   ,-1f,-1.2f,-1.4f,-1.6f,-1.8f 
   ,-2f}; 
 //内圆执行动画时半径变化率 
 private float mRateInnerExit[] = { 
   0.0f,-0.1f,-0.2f,-0.3f,-0.4f 
   ,-0.5f,-0.6f,-0.7f,-0.8f,-0.9f 
   ,-1f}; 
 private int mRateIndexExit;//进入动画变化率的索引 
  
 private Handler mHandler = new Handler(){ 
  @Override 
  public void handleMessage(Message msg) { 
   super.handleMessage(msg); 
   int index = mRateIndex ++; 
   mChangeRateBorder = mRateBorder[(index)% mRateBorder.length]; 
   setPaintCorlor(mBorderPaint,mChangeRateBorder,DEFAULT_BORDER_COLOR); 
   setPaintAlpha(mBorderPaint,(index)% mRateBorder.length,mRateBorder); 
   mChangeRateOuter = mRateOuter[(index) % mRateOuter.length]; 
   setPaintCorlor(mOuterPaint,mChangeRateOuter,mOuterPaintColor); 
   setPaintAlpha(mOuterPaint,(index) % mRateOuter.length,mRateOuter); 
   mChangeRateInner = mRateInner[(index) % mRateInner.length]; 
   setPaintCorlor(mInnerPaint,mChangeRateInner,mInnerPaintColor); 
   setPaintAlpha(mInnerPaint,(index) % mRateInner.length,mRateInner); 
   //System.out.println("---------mChangeRate:"+mChangeRateBorder); 
   invalidate(); 
   mHandler.removeCallbacksAndMessages(null); 
   mHandler.sendEmptyMessageDelayed(0,30); 
  } 
 }; 
 private Handler mHandlerEnter = new Handler(){ 
  @Override 
  public void handleMessage(Message msg) { 
   super.handleMessage(msg); 
   int index = mRateIndexEnter ++; 
   if(index >= mRateOuterEnter.length) { 
    mRateIndexEnter = 0; 
    mHandlerEnter.removeCallbacksAndMessages(null); 
    return; 
   } 
   mChangeRateOuter = mRateOuterEnter[(index) % mRateOuterEnter.length]; 
   mChangeRateInner = mRateInnerEnter[(index) % mRateInnerEnter.length]; 
   invalidate(); 
   mHandlerEnter.removeCallbacksAndMessages(null); 
   mHandlerEnter.sendEmptyMessageDelayed(0,20); 
  } 
 }; 
 private Handler mHandlerExit = new Handler(){ 
  @Override 
  public void handleMessage(Message msg) { 
   super.handleMessage(msg); 
   int index = mRateIndexExit ++; 
   if(index >= mRateOuterExit.length) { 
    mRateIndexExit = 0; 
    mHandlerExit.removeCallbacksAndMessages(null); 
    return; 
   } 
   mChangeRateOuter = mRateOuterExit[(index) % mRateOuterExit.length]; 
   mChangeRateInner = mRateInnerExit[(index) % mRateInnerExit.length]; 
   invalidate(); 
   mHandlerExit.removeCallbacksAndMessages(null); 
   mHandlerExit.sendEmptyMessageDelayed(0,20); 
  } 
 }; 
  
 private void setPaintCorlor(Paint paint,float rate,int color){ 
  if(rate < 0){ 
   paint.setColor(Color.TRANSPARENT); 
  }else{ 
   paint.setColor(color); 
  } 
 } 
  
 private void setPaintAlpha(Paint paint,int index,float[] rate){ 
  int pre = index -1; 
  if(pre >= 0 ){ 
   if(rate[pre] > rate[index] && rate[index] > 0){ 
    int color = paint.getColor(); 
    int colorTransparent = color & 0xff000000; 
    int colorValue = color & 0x00ffffff; 
    colorTransparent = colorTransparent >>> 7; 
    paint.setColor((int)(rate[index] * colorTransparent) << 7 | colorValue); 
   } 
  } 
 } 
 public DynamicAvatarView(Context context) { 
  this(context,null); 
 } 
 public DynamicAvatarView(Context context, AttributeSet attrs) { 
  this(context, attrs,0); 
 } 
 public DynamicAvatarView(Context context, AttributeSet attrs, int defStyleAttr) { 
  super(context, attrs, defStyleAttr); 
  super.setScaleType(SCALE_TYPE); 
  //可以执行了 
  mReady = true; 
  if (mSetupPending) { 
   setup(); 
   mSetupPending = false; 
  } 
 } 
 @Override 
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
  int widthMode = MeasureSpec.getMode(widthMeasureSpec); 
  int widthSize = MeasureSpec.getSize(widthMeasureSpec); 
  int heightMode = MeasureSpec.getMode(heightMeasureSpec); 
  int heightSize = MeasureSpec.getSize(heightMeasureSpec); 
  int size = Math.min(widthSize, heightSize); 
  super.onMeasure(MeasureSpec.makeMeasureSpec(size,widthMode), MeasureSpec.makeMeasureSpec(size,heightMode)); 
 } 
 @Override 
 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 
  super.onLayout(changed, left, top, right, bottom); 
  enterAnim(); 
 } 
 @Override 
 protected void onDraw(Canvas canvas) { 
  if (getDrawable() == null) { 
   return; 
  } 
  //画动画的图形 
  canvas.drawCircle(getWidth() / 2,getHeight() / 2,getChangeRadiusOuter(mOuterRadius),mOuterPaint); 
  canvas.drawCircle(getWidth() / 2,getHeight() / 2,getChangeRadiusInner(mInnerRadius),mInnerPaint); 
  canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius, mBitmapPaint); 
  canvas.drawCircle(getWidth() / 2, getHeight() / 2, getChangeRadiusBorder(mBorderRadius), mBorderPaint); 
 } 
 private float getChangeRadiusBorder(float radius){ 
  return mChangeRateBorder * mChangeRange + radius; 
 } 
 private float getChangeRadiusOuter(float radius){ 
  return mChangeRateOuter * mChangeRange + radius; 
 } 
 private float getChangeRadiusInner(float radius){ 
  return mChangeRateInner * mChangeRange + radius; 
 } 
 private void initAnimColor(){ 
  mOuterPaint.setStyle(Paint.Style.FILL); 
  mOuterPaint.setAntiAlias(true); 
  mOuterPaint.setColor(mOuterPaintColor); 
  mInnerPaint.setStyle(Paint.Style.FILL); 
  mInnerPaint.setAntiAlias(true); 
  mInnerPaint.setColor(mInnerPaintColor); 
  //图片边框（默认白色） 
  mBorderPaint.setColor(mBorderColor); 
  mOuterRadius = mRealBorderRadius / 6 * 5; 
  mInnerRadius = mRealBorderRadius / 6 * 4; 
  mChangeRange = mRealBorderRadius / 6; 
  mRateIndex = 0; 
 } 
  
 public void startAnim(){ 
  mHandler.sendEmptyMessageDelayed(0,30); 
 } 
  
 public void stopAnim(){ 
  mHandler.removeCallbacksAndMessages(null); 
  mChangeRateBorder = 0; 
  mChangeRateOuter = 0; 
  mChangeRateInner = 0; 
//  mBorderPaint.setColor(DEFAULT_BORDER_COLOR); 
//  mOuterPaint.setColor(mOuterPaintColor); 
//  mInnerPaint.setColor(mInnerPaintColor); 
//  mRateIndex = 0; 
  initAnimColor(); 
  //invalidate(); 
  enterAnim(); 
 } 
  
 public void enterAnim(){ 
  mHandlerEnter.sendEmptyMessage(0); 
 } 
  
 public void exitAnim(){ 
  mHandlerExit.sendEmptyMessage(0); 
 } 
  
 public void setOuterPaintColor(int outerPaintColor) { 
  if (outerPaintColor == mOuterPaintColor) { 
   return; 
  } 
  mOuterPaintColor = outerPaintColor; 
  mOuterPaint.setColor(mOuterPaintColor); 
  invalidate(); 
 } 
  
 public void setInnerPaintColor(int innerPaintColor) { 
  if (innerPaintColor == mInnerPaintColor) { 
   return; 
  } 
  mInnerPaintColor = innerPaintColor; 
  mInnerPaint.setColor(mInnerPaintColor); 
  invalidate(); 
 } 
  
 public void setBorderColor(int borderColor) { 
  if (borderColor == mBorderColor) { 
   return; 
  } 
  mBorderColor = borderColor; 
  mBorderPaint.setColor(mBorderColor); 
  invalidate(); 
 } 
  
 public void setBorderWidth(int borderWidth) { 
  if (borderWidth == mBorderWidth) { 
   return; 
  } 
  mBorderWidth = borderWidth; 
  setup(); 
 } 
 @Override 
 public ScaleType getScaleType() { 
  return SCALE_TYPE; 
 } 
 @Override 
 public void setScaleType(ScaleType scaleType) { 
  if (scaleType != SCALE_TYPE) { 
   throw new IllegalArgumentException(String.format("ScaleType %s not supported.", scaleType)); 
  } 
 } 
 @Override 
 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 
  super.onSizeChanged(w, h, oldw, oldh); 
  //只有在此方法中调用setup，setup中的getWidth方法得到的值才不会是0， 
  setup(); 
 } 
 @Override 
 public void setImageBitmap(Bitmap bm) { 
  super.setImageBitmap(bm); 
  mBitmap = getMaxSquareCenter(bm); 
  setup(); 
 } 
  
 @Override 
 public void setImageDrawable(Drawable drawable) { 
  super.setImageDrawable(drawable); 
  mBitmap = getBitmapFromDrawable(drawable); 
  setup(); 
 } 
 @Override 
 public void setImageResource(int resId) { 
  super.setImageResource(resId); 
  mBitmap = getBitmapFromDrawable(getDrawable()); 
  setup(); 
 } 
  
 private Bitmap getMaxSquareCenter(Bitmap bitmap){ 
  int w = bitmap.getWidth(); // 得到图片的宽，高 
  int h = bitmap.getHeight(); 
  int cropWidth = w >= h ? h : w;// 裁切后所取的正方形区域边长 
  return Bitmap.createBitmap(bitmap, (w - cropWidth)/2 , (h - cropWidth)/2, cropWidth, cropWidth, null, false); 
 } 
 private Bitmap getBitmapFromDrawable(Drawable drawable) { 
  if (drawable == null) { 
   return null; 
  } 
  if (drawable instanceof BitmapDrawable) { 
   //从bitmap中间裁剪出最大的正方形 
   Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap(); 
   return getMaxSquareCenter(bitmap); 
   //return ((BitmapDrawable) drawable).getBitmap(); 
  } 
  try { 
   Bitmap bitmap; 
   if (drawable instanceof ColorDrawable) { 
    bitmap = Bitmap.createBitmap(COLORDRAWABLE_DIMENSION, COLORDRAWABLE_DIMENSION, BITMAP_CONFIG); 
   } else { 
    int min = Math.min(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight()); 
    bitmap = Bitmap.createBitmap(min, min, BITMAP_CONFIG); 
   } 
   Canvas canvas = new Canvas(bitmap); 
   int left,top,right,buttom; 
   int width = canvas.getWidth(); 
   int height = canvas.getHeight(); 
   int abs = Math.abs(width - height); 
   if(width <= height){ 
    left = 0; 
    top = (height - abs) / 2; 
    right = width; 
    buttom = height - top; 
   }else{ 
    left = (width - abs) / 2; 
    top = 0; 
    right = width - left; 
    buttom = height; 
   } 
   //drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight()); 
   drawable.setBounds(left, top, right, buttom); 
   drawable.draw(canvas); 
   return bitmap; 
  } catch (OutOfMemoryError e) { 
   return null; 
  } 
 } 
 private void setup() { 
  //只有执行过构造函数之后，所有的成员才被初始化完毕 
  if (!mReady) { 
   mSetupPending = true; 
   return; 
  } 
  if (mBitmap == null) { 
   return; 
  } 
  mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP); 
  mBitmapPaint.setAntiAlias(true); 
  mBitmapPaint.setShader(mBitmapShader); 
  mBorderPaint.setStyle(Paint.Style.STROKE); 
  mBorderPaint.setAntiAlias(true); 
  mBorderPaint.setColor(mBorderColor); 
  mBorderPaint.setStrokeWidth(mBorderWidth); 
  mBitmapHeight = mBitmap.getHeight(); 
  mBitmapWidth = mBitmap.getWidth(); 
  //图片边框设置的范围 
  mBorderRect.set(0, 0, getWidth(), getHeight()); 
  mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2, (mBorderRect.width() - mBorderWidth) / 2) / 2; 
  mRealBorderRadius = 2 * mBorderRadius; 
  //图片显示的范围 
  mDrawableRect.set(mBorderWidth, mBorderWidth, mBorderRect.width() - mBorderWidth, mBorderRect.height() - mBorderWidth); 
  //让图片显示的范围是控件大小的一半 
  mDrawableRadius = Math.min(mDrawableRect.height() / 2, mDrawableRect.width() / 2) / 2; 
  mRealDrawableRadius = 2 * mDrawableRadius; 
  updateShaderMatrix(); 
  initAnimColor(); 
  invalidate(); 
 } 
 private void updateShaderMatrix() { 
  float scale; 
  float dx = 0; 
  float dy = 0; 
  mShaderMatrix.set(null); 
  if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width() * mBitmapHeight) { 
   scale = mDrawableRect.height() / (float) mBitmapHeight / 2; //将图片缩放在正中间 
   dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f; 
  } else { 
   scale = mDrawableRect.width() / (float) mBitmapWidth / 2; 
   dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f; 
  } 
  mShaderMatrix.setScale(scale , scale ); 
  mShaderMatrix.postTranslate((int) (dx + 0.5f) + mBorderWidth + mDrawableRadius, (int) (dy + 0.5f) + mBorderWidth); 
  mBitmapShader.setLocalMatrix(mShaderMatrix); 
 } 
}

参考：https://github.com/hdodenhof/CircleImageView

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