package de.hdodenhof.circleimageview; import edu.njupt.zhb.main.R; import android.content.Context; import android.content.res.TypedArray; 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.util.AttributeSet; import android.widget.ImageView;  public class CircleImageView extends ImageView {   private static final ScaleType SCALE_TYPE = ScaleType.CENTER_CROP;   private static final Bitmap.Config BITMAP_CONFIG = Bitmap.Config.ARGB_8888;  private static final int COLORDRAWABLE_DIMENSION = 1;   private static final int DEFAULT_BORDER_WIDTH = 0;  private static final int DEFAULT_BORDER_COLOR = Color.BLACK;   private final RectF mDrawableRect = new RectF();  private final RectF mBorderRect = new RectF();   private final Matrix mShaderMatrix = new Matrix();  private final Paint mBitmapPaint = new Paint();  private final Paint mBorderPaint = new Paint();   private int mBorderColor = DEFAULT_BORDER_COLOR;  private int mBorderWidth = DEFAULT_BORDER_WIDTH;   private Bitmap mBitmap;  private BitmapShader mBitmapShader;  private int mBitmapWidth;  private int mBitmapHeight;   private float mDrawableRadius;  private float mBorderRadius;   private boolean mReady;  private boolean mSetupPending;   public CircleImageView(Context context) {   super(context);  }   public CircleImageView(Context context, AttributeSet attrs) {   this(context, attrs, 0);  }   public CircleImageView(Context context, AttributeSet attrs, int defStyle) {   super(context, attrs, defStyle);   super.setScaleType(SCALE_TYPE);    TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircleImageView, defStyle, 0);    mBorderWidth = a.getDimensionPixelSize(R.styleable.CircleImageView_border_width, DEFAULT_BORDER_WIDTH);   mBorderColor = a.getColor(R.styleable.CircleImageView_border_color, DEFAULT_BORDER_COLOR);    a.recycle();    mReady = true;    if (mSetupPending) {    setup();    mSetupPending = false;   }  }   @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 onDraw(Canvas canvas) {   if (getDrawable() == null) {    return;   }    canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius, mBitmapPaint);   canvas.drawCircle(getWidth() / 2, getHeight() / 2, mBorderRadius, mBorderPaint);  }   @Override  protected void onSizeChanged(int w, int h, int oldw, int oldh) {   super.onSizeChanged(w, h, oldw, oldh);   setup();  }   public int getBorderColor() {   return mBorderColor;  }   public void setBorderColor(int borderColor) {   if (borderColor == mBorderColor) {    return;   }    mBorderColor = borderColor;   mBorderPaint.setColor(mBorderColor);   invalidate();  }   public int getBorderWidth() {   return mBorderWidth;  }   public void setBorderWidth(int borderWidth) {   if (borderWidth == mBorderWidth) {    return;   }    mBorderWidth = borderWidth;   setup();  }   @Override  public void setImageBitmap(Bitmap bm) {   super.setImageBitmap(bm);   mBitmap = 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 getBitmapFromDrawable(Drawable drawable) {   if (drawable == null) {    return null;   }    if (drawable instanceof BitmapDrawable) {    return ((BitmapDrawable) drawable).getBitmap();   }    try {    Bitmap bitmap;     if (drawable instanceof ColorDrawable) {     bitmap = Bitmap.createBitmap(COLORDRAWABLE_DIMENSION, COLORDRAWABLE_DIMENSION, BITMAP_CONFIG);    } else {     bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), BITMAP_CONFIG);    }     Canvas canvas = new Canvas(bitmap);    drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());    drawable.draw(canvas);    return bitmap;   } catch (OutOfMemoryError e) {    return null;   }  }   private void setup() {   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();    mBorderRect.set(0, 0, getWidth(), getHeight());   mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2, (mBorderRect.width() - mBorderWidth) / 2);    mDrawableRect.set(mBorderWidth, mBorderWidth, mBorderRect.width() - mBorderWidth, mBorderRect.height() - mBorderWidth);   mDrawableRadius = Math.min(mDrawableRect.height() / 2, mDrawableRect.width() / 2);    updateShaderMatrix();   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;    dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f;   } else {    scale = mDrawableRect.width() / (float) mBitmapWidth;    dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f;   }    mShaderMatrix.setScale(scale, scale);   mShaderMatrix.postTranslate((int) (dx + 0.5f) + mBorderWidth, (int) (dy + 0.5f) + mBorderWidth);    mBitmapShader.setLocalMatrix(mShaderMatrix);  }  } 

<?xml version="1.0" encoding="utf-8"?> <resources>  <declare-styleable name="CircleImageView">   <attr name="border_width" format="dimension" />   <attr name="border_color" format="color" />  </declare-styleable> </resources> 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:background="#ff00ff"   >  <com.example.circleimageview.CircleImageView  android:id="@+id/imageview"  android:layout_width="100dp"  android:layout_height="100dp"  android:layout_centerInParent="true"  android:src="@drawable/control_image"  /> </RelativeLayout>