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第一步：创建类RoundCircleDrawable继承Drawable

/** * 圆角矩形 * @Project    App_View * @Package    com.android.view.drawable * @author     chenlin * @version    1.0 * @Date       2016年4月21日 * @Note       TODO */public class RoundCircleDrawable extends Drawable{
       private Paint mPaint;//画笔    private int mWidth;//图片宽与长度的最小值    private int mRadius;//半径    private int mRound;//圆角    private RectF mRectF;//矩形    private Bitmap mBitmap;//图片    private Type mType = Type.TYPE_ROUND;//默认是矩形    //设置类型    enum Type{        TYPE_ROUND, TYPE_CICLE;    }    public RoundCircleDrawable(Bitmap bitmap){        this.mBitmap = bitmap;        //初始化画笔        mPaint = new Paint();        mPaint.setAntiAlias(true);        BitmapShader shader = new BitmapShader(mBitmap, TileMode.CLAMP, TileMode.CLAMP);        mPaint.setShader(shader);        mWidth = Math.min(mBitmap.getWidth(), mBitmap.getHeight());        mRadius = mWidth / 2;    }    /**     * 向外提供设置图片类型的方法     * @param type     */    public void setType(Type type){        this.mType = type;    }    /**     * 暴露给外面设置圆角的大小     *      * @param round     */    public void setRound(int round) {        this.mRound = round;    }    @Override    public void setBounds(int left, int top, int right, int bottom) {        super.setBounds(left, top, right, bottom);        mRectF = new RectF(left, top, right, bottom);    }    @Override    public void draw(Canvas canvas) {        if (mType == Type.TYPE_ROUND) {            canvas.drawRoundRect(mRectF, mRound, mRound, mPaint);        }else {            canvas.drawCircle(mWidth / 2, mWidth / 2, mRadius, mPaint);        }    }    @Override    public int getIntrinsicWidth() {        if (mType == Type.TYPE_CICLE) {            return mWidth;        }else {            return mBitmap.getWidth();        }    }    @Override    public int getIntrinsicHeight() {        if (mType == Type.TYPE_CICLE) {            return mWidth;        }else {            return mBitmap.getHeight();        }    }    @Override    public void setAlpha(int alpha) {        mPaint.setAlpha(alpha);    }    @Override    public void setColorFilter(ColorFilter cf) {        mPaint.setColorFilter(cf);    }    @Override    public int getOpacity() {        return PixelFormat.TRANSLUCENT;    }}

2.实现方法

public class RoundActivity extends Activity {
       private ImageView mImageView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_round_drawable);        mImageView = (ImageView) findViewById(R.id.iv_round);        Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.aa);        //RoundImageDrawable drawable = new RoundImageDrawable(bitmap);        //drawable.setRound(30);        RoundCircleDrawable drawable = new RoundCircleDrawable(bitmap);        drawable.setRound(50);        mImageView.setImageDrawable(drawable);    }}

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