android给用户头像设置圆形加边框

package com.gx.travel.customview;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.NinePatchDrawable;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.ImageView;
import com.gx.travel.R;
/**
*
* 圆形ImageView，可设置最多两个宽度不同且颜色不同的圆形边框。
* 设置颜色在xml布局文件中由自定义属性配置参数指定
*/
public class RoundImageView extends ImageView {
private int mBorderThickness = 0;
private Context mContext;
private int defaultColor = 0xFFFFFFFF;
// 如果只有其中一个有值，则只画一个圆形边框
private int mBorderOutsideColor = 0;
private int mBorderInsideColor = 0;
// 控件默认长、宽
private int defaultWidth = 0;
private int defaultHeight = 0;
public RoundImageView(Context context) {
super(context);
mContext = context;
}

public RoundImageView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
setCustomAttributes(attrs);

}

public RoundImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mContext = context;
setCustomAttributes(attrs);

}

private void setCustomAttributes(AttributeSet attrs) {
TypedArray a = mContext.obtainStyledAttributes(attrs,
R.styleable.roundedimageview);
mBorderThickness = a.getDimensionPixelSize(
R.styleable.roundedimageview_border_thickness, 0);
mBorderOutsideColor = a
.getColor(R.styleable.roundedimageview_border_outside_color,
defaultColor);
mBorderInsideColor = a.getColor(
R.styleable.roundedimageview_border_inside_color, defaultColor);

}

@Override
protected void onDraw(Canvas canvas) {
Drawable drawable = getDrawable();
if (drawable == null) {
return;
}
if (getWidth() == 0 || getHeight() == 0) {
return;
}
this.measure(0, 0);
if (drawable.getClass() == NinePatchDrawable.class)
return;
Bitmap b = ((BitmapDrawable) drawable).getBitmap();
Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
if (defaultWidth == 0) {
defaultWidth = getWidth();
}
if (defaultHeight == 0) {
defaultHeight = getHeight();
}
int radius = 0;
if (mBorderInsideColor != defaultColor
&& mBorderOutsideColor != defaultColor) {// 定义画两个边框，分别为外圆边框和内圆边框
radius = (defaultWidth < defaultHeight ? defaultWidth
: defaultHeight) / 2 - 2 * mBorderThickness;
// 画内圆
drawCircleBorder(canvas, radius + mBorderThickness / 2,
mBorderInsideColor);
// 画外圆
drawCircleBorder(canvas, radius + mBorderThickness
+ mBorderThickness / 2, mBorderOutsideColor);

} else if (mBorderInsideColor != defaultColor
&& mBorderOutsideColor == defaultColor) {// 定义画一个边框

radius = (defaultWidth < defaultHeight ? defaultWidth
: defaultHeight) / 2 - mBorderThickness;

drawCircleBorder(canvas, radius + mBorderThickness / 2,
mBorderInsideColor);

} else if (mBorderInsideColor == defaultColor
&& mBorderOutsideColor != defaultColor) {// 定义画一个边框

radius = (defaultWidth < defaultHeight ? defaultWidth
: defaultHeight) / 2 - mBorderThickness;

drawCircleBorder(canvas, radius + mBorderThickness / 2,
mBorderOutsideColor);

} else {// 没有边框

radius = (defaultWidth < defaultHeight ? defaultWidth
: defaultHeight) / 2;

}

Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);

canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight
/ 2 - radius, null);

}

/**
*
* 获取裁剪后的圆形图片
*
* @param radius半径
*/

public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {

Bitmap scaledSrcBmp;

int diameter = radius * 2;

// 为了防止宽高不相等，造成圆形图片变形，因此截取长方形中处于中间位置最大的正方形图片

int bmpWidth = bmp.getWidth();

int bmpHeight = bmp.getHeight();

int squareWidth = 0, squareHeight = 0;

int x = 0, y = 0;

Bitmap squareBitmap;

if (bmpHeight > bmpWidth) {// 高大于宽

squareWidth = squareHeight = bmpWidth;

x = 0;

y = (bmpHeight - bmpWidth) / 2;

// 截取正方形图片

squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
squareHeight);

} else if (bmpHeight < bmpWidth) {// 宽大于高

squareWidth = squareHeight = bmpHeight;

x = (bmpWidth - bmpHeight) / 2;

y = 0;

squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
squareHeight);

} else {

squareBitmap = bmp;

}

if (squareBitmap.getWidth() != diameter
|| squareBitmap.getHeight() != diameter) {

scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter,
diameter, true);

} else {

scaledSrcBmp = squareBitmap;

}

Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),

scaledSrcBmp.getHeight(),

Config.ARGB_8888);

Canvas canvas = new Canvas(output);

Paint paint = new Paint();

Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(),
scaledSrcBmp.getHeight());

paint.setAntiAlias(true);

paint.setFilterBitmap(true);

paint.setDither(true);

canvas.drawARGB(0, 0, 0, 0);

canvas.drawCircle(scaledSrcBmp.getWidth() / 2,

scaledSrcBmp.getHeight() / 2,

scaledSrcBmp.getWidth() / 2,

paint);

paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));

canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);

bmp = null;

squareBitmap = null;

scaledSrcBmp = null;

return output;

}

/**
*
* 边缘画圆
*/

private void drawCircleBorder(Canvas canvas, int radius, int color) {

Paint paint = new Paint();

/* 去锯齿 */

paint.setAntiAlias(true);

paint.setFilterBitmap(true);

paint.setDither(true);

paint.setColor(color);

/* 设置paint的　style　为STROKE：空心 */

paint.setStyle(Paint.Style.STROKE);

/* 设置paint的外框宽度 */

paint.setStrokeWidth(mBorderThickness);

canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint);

}

}

2.在attr.xml里添加：

<?xml version="1.0" encoding="utf-8"?><resources><declare-styleable name="roundedimageview"><attr name="border_thickness" format="dimension" /><attr name="border_inside_color" format="color" /><attr name="border_outside_color" format="color"></attr></declare-styleable></resources>

3.直接引用：

<!-- border_outside_color 外部圆圈的颜色 --><!-- border_inside_color 内部部圆圈的颜色 --><!-- border_thickness 外圆和内圆的宽度 --><com.gx.travel.customview.RoundImageViewandroid:id="@+id/iv_head"android:layout_width="100dp"android:layout_height="100dp"imagecontrol:border_inside_color="#bc0978"imagecontrol:border_outside_color="#ffffff"imagecontrol:border_thickness="2dp"android:src="@mipmap/iv_unlogin"/>