1.用法
直接在布局中引用即可

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import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.*;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

import com.youmyou.app.R;


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.TRANSPARENT;

 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);
 mBitma