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Android自定义Drawable实现圆形和圆角

2017-09-27 11:50 711 查看

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 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脚本之家。

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标签： Android Drawable 圆形圆角

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