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 andr
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;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; }}
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本文标题: Android自定义Drawable实现圆形和圆角
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