Android自定义Drawable实现圆形和圆角
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
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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 setBounds(int left, int top, int right, int bottom) { super.setBounds(left, top, right, bottom); rectF = new RectF(left, top, right, 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));
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创新互联。
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