android现圆形、圆角，椭圆等自定义图片

android现圆形、圆角，椭圆等自定义图片

分享使用BitmapShader类实现圆形、圆角，椭圆等自定义图片View  图片控件类： public class RoundOvalImageView extends ImageView { private Paint mPaint; private int mWidth; private int mHeight; private int mRadius;//圆半径 private RectF mRect; private int mRoundRadius;// 圆角大小 private BitmapShader mBitmapShader;//图形渲染 private Matrix mMatrix; private int mType;// 记录是圆形还是圆角矩形 public static final int TYPE_CIRCLE = 0;// 圆形 public static final int TYPE_ROUND = 1;// 圆角矩形 public static final int TYPE_OVAL = 2;//椭圆形 public static final int DEFAUT_ROUND_RADIUS = 10;//默认圆角大小 public RoundOvalImageView(Context context) { this(context, null); // TODO Auto-generated constructor stub } public RoundOvalImageView(Context context, AttributeSet attrs) { this(context, attrs, 0); // TODO Auto-generated constructor stub } public RoundOvalImageView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); initView(); } private void initView() { mPaint = new Paint(); mPaint.setAntiAlias(true); mMatrix = new Matrix(); mRoundRadius = DEFAUT_ROUND_RADIUS; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // TODO Auto-generated method stub super.onMeasure(widthMeasureSpec, heightMeasureSpec); // 如果是绘制圆形，则强制宽高大小一致 if (mType == TYPE_CIRCLE) { mWidth = Math.min(getMeasuredWidth(), getMeasuredHeight()); mRadius = mWidth / 2; setMeasuredDimension(mWidth, mWidth); } } @Override protected void onDraw(Canvas canvas) { if (null == getDrawable()) { return; } setBitmapShader(); if (mType == TYPE_CIRCLE) { canvas.drawCircle(mRadius, mRadius, mRadius, mPaint); } else if (mType == TYPE_ROUND) { mPaint.setColor(Color.RED); canvas.drawRoundRect(mRect, mRoundRadius, mRoundRadius, mPaint); } else if (mType == TYPE_OVAL) { canvas.drawOval(mRect, mPaint); } } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { // TODO Auto-generated method stub super.onSizeChanged(w, h, oldw, oldh); mRect = new RectF(0, 0, getWidth(), getHeight()); } /** * 设置BitmapShader */ private void setBitmapShader() { Drawable drawable = getDrawable(); if (null == drawable) { return; } Bitmap bitmap = drawableToBitmap(drawable); // 将bitmap作为着色器来创建一个BitmapShader mBitmapShader = new BitmapShader(bitmap, TileMode.CLAMP, TileMode.CLAMP); float scale = 1.0f; if (mType == TYPE_CIRCLE) { // 拿到bitmap宽或高的小值 int bSize = Math.min(bitmap.getWidth(), bitmap.getHeight()); scale = mWidth * 1.0f / bSize; } else if (mType == TYPE_ROUND || mType == TYPE_OVAL) { // 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 / bitmap.getWidth(), getHeight() * 1.0f / bitmap.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); mPaint.setShader(mBitmapShader); } /** * drawable转bitmap * * @param drawable * @return */ private Bitmap drawableToBitmap(Drawable drawable) { if (drawable instanceof BitmapDrawable) { BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable; return bitmapDrawable.getBitmap(); } int w = drawable.getIntrinsicWidth(); int h = drawable.getIntrinsicHeight(); Bitmap bitmap = Bitmap.createBitmap(w, h, Config.ARGB_8888); Canvas canvas = new Canvas(bitmap); drawable.setBounds(0, 0, w, h); drawable.draw(canvas); return bitmap; } /** * 单位dp转单位px */ public int dpTodx(int dp) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, getResources().getDisplayMetrics()); } public int getType() { return mType; } /** * 设置图片类型：圆形、圆角矩形、椭圆形 * * @param mType */ public void setType(int mType) { if (this.mType != mType) { this.mType = mType; invalidate(); } } public int getRoundRadius() { return mRoundRadius; } /** * 设置圆角大小 * * @param mRoundRadius */ public void setRoundRadius(int mRoundRadius) { if (this.mRoundRadius != mRoundRadius) { this.mRoundRadius = mRoundRadius; invalidate(); } } } 使用方法：                                                                                                                                                                                        -END

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