Android實現動態圓環的圖片頭像控件

先看效果圖：

現在大部分的app上難免會使用到圓形頭像，所以今天我給大家分享一個單獨使用的，並且周圍帶有圓環動畫的花哨圓形頭像控件，本控件是在圓形頭像控件基礎上實現的，只是在其周圍再畫一些不同大小的圓而已，就可以實現如圖的效果。

圓形頭像的基本原理是將設置的資源文件轉化成Bitmap,然後通過BitmapShader類將Bitmap成為Paint的渲染器，然後在onDraw()中通過canvas.drawCircle(rx,ry,radius,paint);畫布上畫圓，而這個圓就是形成了圓形頭像。

在xml中通過src設置的資源文件在ImageView的setImageDrawable(drawable)方法中可以得到Drawable類型的圖像，然後再將Drawable轉成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) { 
   //從bitmap中間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; 
  } 
 } 
/** 
  * 從bitmap中間裁剪出最大的正方形 
  * @param bitmap 
  * @return 
  */ 
 private Bitmap getMaxSquareCenter(Bitmap bitmap){ 
  int w = bitmap.getWidth(); // 得到圖片的寬，高 
  int h = bitmap.getHeight(); 
  int cropWidth = w >= h ? h : w;// 裁切後所取的正方形區域邊長 
  return Bitmap.createBitmap(bitmap, (w - cropWidth)/2 , (h - cropWidth)/2, cropWidth, cropWidth, null, false); 
 } 

獲取到Bitmap對象後就可以將Bitmap縮小一倍後，在將其畫在畫布上，這樣就有地方來畫周圍的圓環了。

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; //將圖片縮放在正中間 縮小一倍 
   dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f; 
  } else { 
   scale = mDrawableRect.width() / (float) mBitmapWidth / 2; //將圖片縮放在正中間 縮小一倍 
   dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f; 
  } 
 
  mShaderMatrix.setScale(scale , scale ); 
 //在x軸上平移mDrawableRadius，就在正中間了 
  mShaderMatrix.postTranslate((int) (dx + 0.5f) + mBorderWidth + mDrawableRadius, (int) (dy + 0.5f) + mBorderWidth); 
 
  mBitmapShader.setLocalMatrix(mShaderMatrix); 
 } 

下面就是畫圖片周圍的圓環了，就是在圖片的外圍畫兩個圓，一個半徑大點，顏色淺點，一個半徑小點，顏色深點就可以了，然後通過Handler通過延時操作，不斷的改變兩個圓的半徑大小和顏色的深淺，重繪就可以了

 private float mChangeRateBorder;//記錄外圓執行動畫時半徑變化率 
 private float mChangeRateOuter;//記錄內圓執行動畫時半徑變化率 
 private float mChangeRateInner;//記錄圖片邊框執行動畫時半徑變化率 
 private float mChangeRange;//變化范圍，View半徑的1/6 
//*******執行動畫*******// 
 //外圓執行動畫時半徑變化率 
 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}; 
 //內圓執行動畫時半徑變化率 
 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}; 
 //圖片邊框執行動畫時半徑變化率 
 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;//動畫變化率的索引 

Handler不斷改變半徑的變化率和畫筆的顏色

/** 
  * 按住執行動畫 
  */ 
 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); 
  } 
 }; 

每執行一次handleMessage()就會觸發（invalidate()）View重繪，onDraw中不斷的重繪，只需改變每個Circle的半徑即可

@Override 
 protected void onDraw(Canvas canvas) { 
 
  if (getDrawable() == null) { 
   return; 
  } 
 
  //畫動畫的圖形 
  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); 
 } 

根據Handler中給的變化率來計算每個Circle的半徑

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; 
 
 } 

這樣在不斷的向Handler發送消息時，也就會不斷的觸發重繪，不斷改變外圍圓的大小，形成上圖所見的動畫效果
如下四個方法，就是來控制圓環所展示的不同狀態

/** 
  * 開始動畫 
  */ 
 public void startAnim(){ 
 //讓外圍的圓環動起來 
  mHandler.sendEmptyMessageDelayed(0,30); 
 
 } 
 /** 
  * 停止動畫 
  */ 
 public void stopAnim(){ 
 //停止外圓環的動畫，展示默認的大小 
  mHandler.removeCallbacksAndMessages(null); 
  mChangeRateBorder = 0; 
  mChangeRateOuter = 0; 
  mChangeRateInner = 0; 
 
  initAnimColor(); 
 
  enterAnim(); 
 } 
 /** 
  * 進入動畫 
  */ 
 public void enterAnim(){ 
 //展示外圓環，顯示默認大小 
  mHandlerEnter.sendEmptyMessage(0); 
 } 
 
 /** 
  * 退出動畫 
  */ 
 public void exitAnim(){ 
 //隱藏外圓環 
  mHandlerExit.sendEmptyMessage(0); 
 } 

好了，動態頭像到這基本就實現了，進入動畫和退出動畫的代碼就不貼出來分析了，如果發現bug或者有任何意見歡迎留言。

完整源碼 

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; 
 
/** 
 * Created by cj_28 on 2016/10/15. 
 */ 
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;//顯示的圖片 
 private float mBorderRadius;//..//顯示的圖片上的邊框 
 private float mOuterRadius;//外層動畫 
 private float mInnerRadius;//..//內層動畫 
 
 private float mRealDrawableRadius;//這是View沒有被縮放之前的mDrawableRadius的半徑 
 private float mRealBorderRadius;//.. 
 
 private boolean mReady; 
 private boolean mSetupPending; 
 
 private float mChangeRateBorder;//記錄外圓執行動畫時半徑變化率 
 private float mChangeRateOuter;//記錄內圓執行動畫時半徑變化率 
 private float mChangeRateInner;//記錄圖片邊框執行動畫時半徑變化率 
 private float mChangeRange;//變化范圍，View半徑的1/6 
 
 //*******執行動畫*******// 
 //外圓執行動畫時半徑變化率 
 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}; 
 //內圓執行動畫時半徑變化率 
 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}; 
 //圖片邊框執行動畫時半徑變化率 
 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;//動畫變化率的索引 
 
 //*******進入動畫*******// 
 //外圓執行動畫時半徑變化率 
 private float mRateOuterEnter[] = { 
   -2,-2,//外圓要縮小2個mChangeRange才會完全隱藏 
   -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}; 
 //內圓執行動畫時半徑變化率 
 private float mRateInnerEnter[] = { 
   -1,-1,//外圓要縮小1個mChangeRange才會完全隱藏 
   -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;//進入動畫變化率的索引 
 
 //*******退出動畫*******// 
 //外圓執行動畫時半徑變化率 
 private float mRateOuterExit[] = { 
 
   0.0f,-0.2f,-0.4f,-0.6f,-0.8f 
   ,-1f,-1.2f,-1.4f,-1.6f,-1.8f 
   ,-2f}; 
 //內圓執行動畫時半徑變化率 
 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;//進入動畫變化率的索引 
 
 
 /** 
  * 按住執行動畫 
  */ 
 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); 
  } 
 }; 
 
 /** 
  * 設置outer和inner的畫筆顏色 
  * @param paint 
  * @param rate 
  * @param color 
  */ 
 private void setPaintCorlor(Paint paint,float rate,int color){ 
  if(rate < 0){ 
   paint.setColor(Color.TRANSPARENT); 
  }else{ 
   paint.setColor(color); 
  } 
 } 
 
 /** 
  * 設置透明度 
  * @param paint 
  * @param index 
  * @param rate 
  */ 
 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); 
 
  //可以執行了 
  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; 
  } 
 
  //畫動畫的圖形 
  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); 
  //圖片邊框（默認白色） 
  mBorderPaint.setColor(mBorderColor); 
 
  mOuterRadius = mRealBorderRadius / 6 * 5; 
  mInnerRadius = mRealBorderRadius / 6 * 4; 
  mChangeRange = mRealBorderRadius / 6; 
  mRateIndex = 0; 
 } 
 
 /** 
  * 開始動畫 
  */ 
 public void startAnim(){ 
  mHandler.sendEmptyMessageDelayed(0,30); 
 
 } 
 /** 
  * 停止動畫 
  */ 
 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(); 
 } 
 /** 
  * 進入動畫 
  */ 
 public void enterAnim(){ 
  mHandlerEnter.sendEmptyMessage(0); 
 } 
 
 /** 
  * 退出動畫 
  */ 
 public void exitAnim(){ 
  mHandlerExit.sendEmptyMessage(0); 
 } 
 
 /** 
  * 設置外圓動畫的顏色 
  * @param outerPaintColor 
  */ 
 public void setOuterPaintColor(int outerPaintColor) { 
  if (outerPaintColor == mOuterPaintColor) { 
   return; 
  } 
  mOuterPaintColor = outerPaintColor; 
  mOuterPaint.setColor(mOuterPaintColor); 
  invalidate(); 
 } 
 
 /** 
  * 設置內圓動畫的顏色 
  * @param innerPaintColor 
  */ 
 public void setInnerPaintColor(int innerPaintColor) { 
  if (innerPaintColor == mInnerPaintColor) { 
   return; 
  } 
  mInnerPaintColor = innerPaintColor; 
  mInnerPaint.setColor(mInnerPaintColor); 
  invalidate(); 
 } 
 
 /** 
  * 設置圖片邊框的顏色 
  * @param borderColor 
  */ 
 public void setBorderColor(int borderColor) { 
  if (borderColor == mBorderColor) { 
   return; 
  } 
 
  mBorderColor = borderColor; 
  mBorderPaint.setColor(mBorderColor); 
  invalidate(); 
 } 
 
 /** 
  * 設置圖片邊框的寬度 
  * @param borderWidth 
  */ 
 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); 
  //只有在此方法中調用setup，setup中的getWidth方法得到的值才不會是0， 
  setup(); 
 } 
 
 @Override 
 public void setImageBitmap(Bitmap bm) { 
  super.setImageBitmap(bm); 
  mBitmap = getMaxSquareCenter(bm); 
  setup(); 
 } 
 
 /** 
  * mxl中設置src就會走此方法 
  * @param drawable 
  */ 
 @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(); 
 } 
 
 /** 
  * 從bitmap中間裁剪出最大的正方形 
  * @param bitmap 
  * @return 
  */ 
 private Bitmap getMaxSquareCenter(Bitmap bitmap){ 
  int w = bitmap.getWidth(); // 得到圖片的寬，高 
  int h = bitmap.getHeight(); 
  int cropWidth = w >= h ? h : w;// 裁切後所取的正方形區域邊長 
  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) { 
   //從bitmap中間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() { 
  //只有執行過構造函數之後，所有的成員才被初始化完畢 
  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(); 
  //圖片邊框設置的范圍 
  mBorderRect.set(0, 0, getWidth(), getHeight()); 
  mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2, (mBorderRect.width() - mBorderWidth) / 2) / 2; 
  mRealBorderRadius = 2 * mBorderRadius; 
  //圖片顯示的范圍 
  mDrawableRect.set(mBorderWidth, mBorderWidth, mBorderRect.width() - mBorderWidth, mBorderRect.height() - mBorderWidth); 
  //讓圖片顯示的范圍是控件大小的一半 
  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; //將圖片縮放在正中間 
   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); 
 } 
 
} 

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

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