<?xml version="1.0" encoding="utf-8"?> 
<resources> 
 
 <attr name="borderRadius" format="dimension" /> 
 <attr name="type"> 
  <enum name="circle" value="0" /> 
  <enum name="round" value="1" /> 
 </attr> 
 
 
 <declare-styleable name="RoundImageView"> 
  <attr name="borderRadius" /> 
  <attr name="type" /> 
 </declare-styleable> 
 
</resources> 

public class RoundImageView extends ImageView 
{ 
 
 /** 
  * 图片的类型，圆形or圆角 
  */ 
 private int type; 
 private static final int TYPE_CIRCLE = 0; 
 private static final int TYPE_ROUND = 1; 
 
 /** 
  * 圆角大小的默认值 
  */ 
 private static final int BODER_RADIUS_DEFAULT = 10; 
 /** 
  * 圆角的大小 
  */ 
 private int mBorderRadius; 
 
 /** 
  * 绘图的Paint 
  */ 
 private Paint mBitmapPaint; 
 /** 
  * 圆角的半径 
  */ 
 private int mRadius; 
 /** 
  * 3x3 矩阵，主要用于缩小放大 
  */ 
 private Matrix mMatrix; 
 /** 
  * 渲染图像，使用图像为绘制图形着色 
  */ 
 private BitmapShader mBitmapShader; 
 /** 
  * view的宽度 
  */ 
 private int mWidth; 
 private RectF mRoundRect; 
 
 public RoundImageView(Context context, AttributeSet attrs) 
 { 
  super(context, attrs); 
  mMatrix = new Matrix(); 
  mBitmapPaint = new Paint(); 
  mBitmapPaint.setAntiAlias(true); 
 
  TypedArray a = context.obtainStyledAttributes(attrs, 
    R.styleable.RoundImageView); 
 
  mBorderRadius = a.getDimensionPixelSize( 
    R.styleable.RoundImageView_borderRadius, (int) TypedValue 
      .applyDimension(TypedValue.COMPLEX_UNIT_DIP, 
        BODER_RADIUS_DEFAULT, getResources() 
          .getDisplayMetrics()));// 默认为10dp 
  type = a.getInt(R.styleable.RoundImageView_type, TYPE_CIRCLE);// 默认为Circle 
 
  a.recycle(); 
 } 

@Override 
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
 { 
  Log.e("TAG", "onMeasure"); 
  super.onMeasure(widthMeasureSpec, heightMeasureSpec); 
 
  /** 
   * 如果类型是圆形，则强制改变view的宽高一致，以小值为准 
   */ 
  if (type == TYPE_CIRCLE) 
  { 
   mWidth = Math.min(getMeasuredWidth(), getMeasuredHeight()); 
   mRadius = mWidth / 2; 
   setMeasuredDimension(mWidth, mWidth); 
  } 
 
 } 

/** 
  * 初始化BitmapShader 
  */ 
 private void setUpShader() 
 { 
  Drawable drawable = getDrawable(); 
  if (drawable == null) 
  { 
   return; 
  } 
 
  Bitmap bmp = drawableToBitamp(drawable); 
  // 将bmp作为着色器，就是在指定区域内绘制bmp 
  mBitmapShader = new BitmapShader(bmp, TileMode.CLAMP, TileMode.CLAMP); 
  float scale = 1.0f; 
  if (type == TYPE_CIRCLE) 
  { 
   // 拿到bitmap宽或高的小值 
   int bSize = Math.min(bmp.getWidth(), bmp.getHeight()); 
   scale = mWidth * 1.0f / bSize; 
 
  } else if (type == TYPE_ROUND) 
  { 
   // 如果图片的宽或者高与view的宽高不匹配，计算出需要缩放的比例；缩放后的图片的宽高，一定要大于我们view的宽高；所以我们这里取大值； 
   scale = Math.max(getWidth() * 1.0f / bmp.getWidth(), getHeight() 
     * 1.0f / bmp.getHeight()); 
  } 
  // shader的变换矩阵，我们这里主要用于放大或者缩小 
  mMatrix.setScale(scale, scale); 
  // 设置变换矩阵 
  mBitmapShader.setLocalMatrix(mMatrix); 
  // 设置shader 
  mBitmapPaint.setShader(mBitmapShader); 
 } 

mBitmapShader = new BitmapShader(bmp, TileMode.CLAMP, TileMode.CLAMP);

/** 
  * drawable转bitmap 
  * 
  * @param drawable 
  * @return 
  */ 
 private Bitmap drawableToBitamp(Drawable drawable) 
 { 
  if (drawable instanceof BitmapDrawable) 
  { 
   BitmapDrawable bd = (BitmapDrawable) drawable; 
   return bd.getBitmap(); 
  } 
  int w = drawable.getIntrinsicWidth(); 
  int h = drawable.getIntrinsicHeight(); 
  Bitmap bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); 
  Canvas canvas = new Canvas(bitmap); 
  drawable.setBounds(0, 0, w, h); 
  drawable.draw(canvas); 
  return bitmap; 
 } 

@Override 
 protected void onDraw(Canvas canvas) 
 { 
  if (getDrawable() == null) 
  { 
   return; 
  } 
  setUpShader(); 
 
  if (type == TYPE_ROUND) 
  { 
   canvas.drawRoundRect(mRoundRect, mBorderRadius, mBorderRadius, 
     mBitmapPaint); 
  } else 
  { 
   canvas.drawCircle(mRadius, mRadius, mRadius, mBitmapPaint); 
   // drawSomeThing(canvas); 
  } 
 } 
  
 @Override 
 protected void onSizeChanged(int w, int h, int oldw, int oldh) 
 { 
  super.onSizeChanged(w, h, oldw, oldh); 
  // 圆角图片的范围 
  if (type == TYPE_ROUND) 
   mRoundRect = new RectF(0, 0, getWidth(), getHeight()); 
 } 

private static final String STATE_INSTANCE = "state_instance"; 
 private static final String STATE_TYPE = "state_type"; 
 private static final String STATE_BORDER_RADIUS = "state_border_radius"; 
 
 @Override 
 protected Parcelable onSaveInstanceState() 
 { 
  Bundle bundle = new Bundle(); 
  bundle.putParcelable(STATE_INSTANCE, super.onSaveInstanceState()); 
  bundle.putInt(STATE_TYPE, type); 
  bundle.putInt(STATE_BORDER_RADIUS, mBorderRadius); 
  return bundle; 
 } 
 
 @Override 
 protected void onRestoreInstanceState(Parcelable state) 
 { 
  if (state instanceof Bundle) 
  { 
   Bundle bundle = (Bundle) state; 
   super.onRestoreInstanceState(((Bundle) state) 
     .getParcelable(STATE_INSTANCE)); 
   this.type = bundle.getInt(STATE_TYPE); 
   this.mBorderRadius = bundle.getInt(STATE_BORDER_RADIUS); 
  } else 
  { 
   super.onRestoreInstanceState(state); 
  } 
 
 } 

public void setBorderRadius(int borderRadius) 
 { 
  int pxVal = dp2px(borderRadius); 
  if (this.mBorderRadius != pxVal) 
  { 
   this.mBorderRadius = pxVal; 
   invalidate(); 
  } 
 } 
 
 public void setType(int type) 
 { 
  if (this.type != type) 
  { 
   this.type = type; 
   if (this.type != TYPE_ROUND && this.type != TYPE_CIRCLE) 
   { 
    this.type = TYPE_CIRCLE; 
   } 
   requestLayout(); 
  } 
 
 } 
 
 public int dp2px(int dpVal) 
 { 
  return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 
    dpVal, getResources().getDisplayMetrics()); 
 } 

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android" 
 xmlns:tools="http://schemas.android.com/tools" 
 xmlns:zhy="http://schemas.android.com/apk/res/com.zhy.variousshapeimageview" 
 android:layout_width="match_parent" 
 android:layout_height="wrap_content" > 
 
 <LinearLayout 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:orientation="vertical" > 
 
  <com.zhy.view.RoundImageView 
   android:id="@+id/id_qiqiu" 
   android:layout_width="wrap_content" 
   android:layout_height="wrap_content" 
   android:layout_margin="10dp" 
   android:src="@drawable/qiqiu" > 
  </com.zhy.view.RoundImageView> 
 
  <com.zhy.view.RoundImageView 
   android:layout_width="200dp" 
   android:layout_height="200dp" 
   android:layout_margin="10dp" 
   android:src="@drawable/aa" > 
  </com.zhy.view.RoundImageView> 
 
  <com.zhy.view.RoundImageView 
   android:layout_width="wrap_content" 
   android:layout_height="wrap_content" 
   android:layout_margin="10dp" 
   android:src="@drawable/icon" > 
  </com.zhy.view.RoundImageView> 
 
  <com.zhy.view.RoundImageView 
   android:id="@+id/id_meinv" 
   android:layout_width="wrap_content" 
   android:layout_height="wrap_content" 
   android:layout_margin="10dp" 
   android:src="@drawable/aa" 
   zhy:borderRadius="20dp" 
   zhy:type="round" > 
  </com.zhy.view.RoundImageView> 
 
  <com.zhy.view.RoundImageView 
   android:layout_width="wrap_content" 
   android:layout_height="wrap_content" 
   android:layout_margin="10dp" 
   android:src="@drawable/icon" 
   zhy:borderRadius="40dp" 
   zhy:type="round" > 
  </com.zhy.view.RoundImageView> 
 
  <com.zhy.view.RoundImageView 
   android:layout_width="wrap_content" 
   android:layout_height="wrap_content" 
   android:layout_margin="10dp" 
   android:src="@drawable/qiqiu" 
   zhy:borderRadius="60dp" 
   zhy:type="round" > 
  </com.zhy.view.RoundImageView> 
 </LinearLayout> 
 
</ScrollView> 

package com.zhy.variousshapeimageview; 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
 
import com.zhy.view.RoundImageView; 
 
public class MainActivity extends Activity 
{ 
 private RoundImageView mQiQiu; 
 private RoundImageView mMeiNv ; 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) 
 { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.activity_main); 
   
  mQiQiu = (RoundImageView) findViewById(R.id.id_qiqiu); 
  mMeiNv = (RoundImageView) findViewById(R.id.id_meinv); 
   
  mQiQiu.setOnClickListener(new OnClickListener() 
  { 
   @Override 
   public void onClick(View v) 
   { 
    mQiQiu.setType(RoundImageView.TYPE_ROUND); 
   } 
  }); 
   
  mMeiNv.setOnClickListener(new OnClickListener() 
  { 
    
   @Override 
   public void onClick(View v) 
   { 
    mMeiNv.setBorderRadius(90); 
   } 
  }); 
 } 
 
}