自定义圆形头像图标控件

创建RoundImageView.class

`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(Config.ARGB_8888, true);
if (defaultWidth == 0) {
defaultWidth = getWidth();

}
if (defaultHeight == 0) {
defaultHeight = getHeight();
}
// 保证重新读取图片后不会因为图片大小而改变控件宽、高的大小（针对宽、高为wrap_content布局的imageview，但会导致margin无效）
// if (defaultWidth != 0 && defaultHeight != 0) {
// LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
// defaultWidth, defaultHeight);
// setLayoutParams(params);
// }
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);

// bitmap回收(recycle导致在布局文件XML看不到效果)

// bmp.recycle();

// squareBitmap.recycle();

// scaledSrcBmp.recycle();

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);

}

`

定义属性文件attrs.xml

<?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>

5.布局文件中引用

<com.android.xx.widget.RoundImageView

android:id="@+id/cover_user_photo"

android:layout_width="80dp"

android:layout_height="80dp"

android:scaleType="centerCrop"

android:src="@drawable/face"

imagecontrol:border_inside_color="#fff7f2e9"

imagecontrol:border_outside_color="#ffd5d1c8"

imagecontrol:border_thickness="3dp"/>