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, 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, 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, 0, bitmap.getWidth(), bitmap.getHeight()); } @Override public void draw(@NonNull Canvas canvas) { //RectF:圆角矩形区域 canvas.drawRoundRect(new RectF(0, 0, mBitmap.getWidth(), mBitmap.getHeight()),100, 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 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));

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。