Android自定义Drawable实现圆形和圆角

概述本文实例为大家分享了自定义Drawable实现圆形和圆角的具体代码，供大家参考，具体内容如下

本文实例为大家分享了自定义Drawable实现圆形和圆角的具体代码，供大家参考，具体内容如下

圆形

package com.customvIEw.Widget;import androID.graphics.Bitmap;import androID.graphics.BitmapShader;import androID.graphics.Canvas;import androID.graphics.colorFilter;import androID.graphics.Paint;import androID.graphics.PixelFormat;import androID.graphics.Shader;import androID.graphics.drawable.Drawable;import androID.support.annotation.IntRange;import androID.support.annotation.NonNull;import androID.support.annotation.Nullable;/** * 自定义Drawable 实现圆形图片 * Created by hust_twj on 2017/9/26. */public class CircleDrawable extends Drawable {  private Paint mPaint;  private int mWIDth; //宽/高，直径  private Bitmap mBitmap;  public CircleDrawable(Bitmap bitmap) {    this.mBitmap = bitmap;    BitmapShader bitmapShader = new BitmapShader(mBitmap,Shader.TileMode.CLAMP,Shader.TileMode.CLAMP);//着色器 水平和竖直都需要填充满    mPaint = new Paint();    mPaint.setAntiAlias(true);    mPaint.setShader(bitmapShader);    mWIDth = Math.min(mBitmap.getWIDth(),mBitmap.getHeight()); //宽高的最小值作为直径  }  @OverrIDe  public voID draw(@NonNull Canvas canvas) {    canvas.drawCircle(mWIDth/2,mWIDth/2,mPaint); //绘制圆形  }  @OverrIDe  public voID setAlpha(@IntRange(from = 0,to = 255) int i) {    mPaint.setAlpha(i);  }  @OverrIDe  public voID setcolorFilter(@Nullable colorFilter colorFilter) {    mPaint.setcolorFilter(colorFilter);  }  @OverrIDe  public int getopacity() {    return PixelFormat.TRANSLUCENT; //设置系统默认，让drawable支持和窗口一样的透明度  }  //还需要从重写以下2个方法，返回drawable实际宽高  @OverrIDe  public int getIntrinsicWIDth() {    return mWIDth;  }  @OverrIDe  public int getIntrinsicHeight() {    return mWIDth;  }}

圆角：

package com.customvIEw.Widget;import androID.graphics.Bitmap;import androID.graphics.BitmapShader;import androID.graphics.Canvas;import androID.graphics.colorFilter;import androID.graphics.Paint;import androID.graphics.PixelFormat;import androID.graphics.RectF;import androID.graphics.Shader;import androID.graphics.drawable.Drawable;import androID.support.annotation.IntRange;import androID.support.annotation.NonNull;import androID.support.annotation.Nullable;/** * 自定义Drawable 实现圆角图片 * Created by hust_twj on 2017/9/26. */public class RoundCornerDrawable extends Drawable {  private Paint mPaint;  private RectF rectF;//定义矩形区域  private Bitmap mBitmap;  public RoundCornerDrawable(Bitmap bitmap) {    this.mBitmap = bitmap;    BitmapShader bitmapShader = new BitmapShader(mBitmap,Shader.TileMode.CLAMP);//着色器 水平和竖直都需要填充满    mPaint = new Paint();    mPaint.setAntiAlias(true);    mPaint.setShader(bitmapShader);    //rectF = new RectF(0,bitmap.getWIDth(),bitmap.getHeight());  }  @OverrIDe  public voID draw(@NonNull Canvas canvas) {    //RectF:圆角矩形区域    canvas.drawRoundRect(new RectF(0,mBitmap.getWIDth(),mBitmap.getHeight()),100,mPaint);//rx：x方向上的圆角半径; ry：y方向上的圆角半径。  }/*  @OverrIDe  public voID setBounds(int left,int top,int right,int bottom) {    super.setBounds(left,top,right,bottom);    rectF = new RectF(left,bottom);  }*/  @OverrIDe  public voID setAlpha(@IntRange(from = 0,to = 255) int i) {    mPaint.setAlpha(i);  }  @OverrIDe  public voID setcolorFilter(@Nullable colorFilter colorFilter) {    mPaint.setcolorFilter(colorFilter);  }  @OverrIDe  public int getopacity() {    return PixelFormat.TRANSLUCENT; //设置系统默认，让drawable支持和窗口一样的透明度  }  //还需要从重写以下2个方法，返回drawable实际宽高  @OverrIDe  public int getIntrinsicWIDth() {    return mBitmap.getWIDth();  }  @OverrIDe  public int getIntrinsicHeight() {    return mBitmap.getHeight();  }}

MainActivity中：

Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.XXX);imageVIEw.setimageDrawable(new RoundCornerDrawable(bitmap));

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