自定义图片形状

自定义图片形状（通过ShapeDrawable）：

import android.annotation.SuppressLint; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapShader; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Path; import android.graphics.RectF; import android.graphics.Shader; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.ShapeDrawable; import android.graphics.drawable.shapes.ArcShape; import android.graphics.drawable.shapes.OvalShape; import android.graphics.drawable.shapes.PathShape; import android.graphics.drawable.shapes.RectShape; import android.graphics.drawable.shapes.RoundRectShape; import android.util.AttributeSet; import android.view.View;public class ShapeView extends View{private Paint paint;private BitmapShader bitmapShader;private Bitmap bitmap;private ShapeDrawable shapeDrawable;private int centerx,centery,radius;/** 默认类型为圆形*/private int type=CIRCLE_BITMAP;private Path path;/** 外矩形 圆角半径 */private float[] outerR;/** 内部矩形与外部矩形的距离 */private RectF inset;/** 内矩形 圆角半径 */private float[] innerRadii = {20, 20, 20, 20, 20, 20, 20, 20};/** 圆形图片*/public static final int CIRCLE_BITMAP=11;/** 矩形图片*/public static final int RECT_BITMAP=12;/** 椭圆图片*/public static final int OVAL_BITMAP=13;/** 圆角图片*/public static final int ROUNDRECT_BITMAP=14;/** 弧形图片*/public static final int ARC_BITMAP=15;/** path路径图片*/public static final int PATH_BITMAP=16;public ShapeView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);}public ShapeView(Context context, AttributeSet attrs) {super(context, attrs);}public ShapeView(Context context) {super(context);}/*** 设置图片类型* @param type*/public void SetType(int type){this.type=type;}@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {centerx=w/2;centery=h/2;radius=Math.min(centerx,centery);paint=new Paint();bitmap=((BitmapDrawable)getResources().getDrawable(R.drawable.shape)).getBitmap();// 构造渲染器BitmapShader bitmapShader=new android.graphics.BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);}@SuppressLint("DrawAllocation")@Overrideprotected void onDraw(Canvas canvas) {switch (type) {case CIRCLE_BITMAP: // paint.setShader(bitmapShader); // canvas.drawCircle(centerx,centery, radius, paint);shapeDrawable=new ShapeDrawable(new OvalShape());//添加椭圆模型shapeDrawable.setBounds(0, 0, radius*2, radius*2);//设置显示区域 为圆形break;case RECT_BITMAP:shapeDrawable=new ShapeDrawable(new RectShape());//添加矩形模型shapeDrawable.setBounds(0, 0, radius*2, radius*2);//设置显示区域 为圆形break;case OVAL_BITMAP:shapeDrawable=new ShapeDrawable(new OvalShape());//添加椭圆模型shapeDrawable.setBounds(0, 0, centerx*2, centery*2);//设置显示区域 为矩形break;case ROUNDRECT_BITMAP://外矩形 左上、右上、右下、左下 圆角半径 outerR = new float[] { 50, 50, 50, 50, 50, 50, 50, 50};//内矩形距外矩形，左上角x,y距离， 右下角x,y距离 , 内部矩形与外部矩形的距离 inset = new RectF(150,150, 200,200); shapeDrawable=new ShapeDrawable(new RoundRectShape(outerR,null, null));//添加圆角模型 // shapeDrawable=new ShapeDrawable(new RoundRectShape(outerR,inset, innerRadii));//添加圆角模型shapeDrawable.setBounds(0, 0, centerx*2, centery*2);//设置显示区域 为矩形break;case ARC_BITMAP:shapeDrawable=new ShapeDrawable(new ArcShape(135, 270));//添加弧形模型 （135：开始角度，270:扫描角度）shapeDrawable.setBounds(0, 0, radius*2, radius*2);//设置显示区域 为圆形break;case PATH_BITMAP://绘制一个顶点为下列四个点的棱形 path = new Path(); path.moveTo(50, 0); path.lineTo(0, 50); path.lineTo(50, 100); path.lineTo(100, 50); shapeDrawable=new ShapeDrawable(new PathShape(path, 100, 200));//添加几何路径 // 100, 200 最终呈现出的坐标值(实际内部是缩放的canvas)shapeDrawable.setBounds(0, 0, radius*2, radius*2);//设置显示区域 为圆形break;default:break;}//得到画笔并设置渲染器 shapeDrawable.getPaint().setShader(bitmapShader);//绘制shapeDrawable shapeDrawable.draw(canvas);} }

关于shape：

有位盆友写的挺详细，有兴趣的可以看看：http://blog.csdn.net/jjwwmlp456/article/details/46928859

总结

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