android两种方式实现圆形图片

在项目中，我们经常会用到圆形图片，但是android本身又没有提供，那我只能我们自己来完成。
第一种方式，自定义CircleImageView:
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 = 2;    // 圆形边框的厚度默认值。    // 如果是0，则没有天蓝色渐变的边框。    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;    private final Paint mFlagBackgroundPaint = new Paint();    private final TextPaint mFlagTextPaint = new TextPaint();    private String mFlagText;    private boolean mShowFlag = false;    private Rect mFlagTextBounds = new Rect();    Shader mSweepGradient = null;    public CircleImageView(Context context) {        super(context);        init();    }    public CircleImageView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public CircleImageView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        init();    }    private void init() {        super.setScaleType(SCALE_TYPE);        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    public void setAdjustViewBounds(boolean adjustViewBounds) {        if (adjustViewBounds) {            throw new IllegalArgumentException(                    "adjustViewBounds not supported.");        }    }    @Override    protected void onDraw(Canvas canvas) {        if (getDrawable() == null) {            return;        }        canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius,                mBitmapPaint);        if (mBorderWidth != 0) {            canvas.save();            canvas.rotate(20, getWidth() / 2, getHeight() / 2);            canvas.drawCircle(getWidth() / 2, getHeight() / 2, mBorderRadius,                    mBorderPaint);            canvas.restore();        }        if (mShowFlag && mFlagText != null) {            canvas.drawArc(mBorderRect, 40, 100, false, mFlagBackgroundPaint);            mFlagTextPaint.getTextBounds(mFlagText, 0, mFlagText.length(),                    mFlagTextBounds);            canvas.drawText(mFlagText, getWidth() / 2,                    (float) ((3 + Math.cos((float) (Math.PI * 5 / 18)))                                                * getHeight() / 4 + mFlagTextBounds.height() / 3),                    mFlagTextPaint);        }    }    @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;    }    /**     * @param borderWidth     *            圆形的边框厚度。     */    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();    }    @Override    public void setImageURI(Uri uri) {        super.setImageURI(uri);        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);        mFlagBackgroundPaint.setColor(Color.BLACK & 0x66FFFFFF);        mFlagBackgroundPaint.setFlags(TextPaint.ANTI_ALIAS_FLAG);        mFlagTextPaint.setFlags(TextPaint.ANTI_ALIAS_FLAG);        mFlagTextPaint.setTextAlign(Align.CENTER);        mFlagTextPaint.setColor(Color.WHITE);        mFlagTextPaint                .setTextSize(getResources().getDisplayMetrics().density * 18);        mSweepGradient = new SweepGradient(getWidth() / 2, getHeight() / 2,                new int[] { Color.rgb(255, 255, 255), Color.rgb(1, 209, 255) },                null);        mBorderPaint.setShader(mSweepGradient);        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);    }    public void setShowFlag(boolean show) {        mShowFlag = show;        invalidate();    }    public void setFlagText(String text) {        mFlagText = text;        invalidate();    }}
使用的时候，切记不要引用成V4报下的CircleImageView！！
第二种方式：把图片修剪为圆形，这样给我们视觉上的效果是一样，详见我的另一篇文章：
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