本文的控件來自：http://blog.csdn.net/alan_biao/article/details/17379925

這個控件不同于之前介紹過的那個框架，這個僅僅能過將圖片裁剪為圓形，沒能弄成橢圓，也沒有android:scaleType屬性。但他可以提供兩重邊框，對于簡單的使用來說，是完全夠用的。

使用方式和之前一樣，首先先配置attrs.xml

<!-- border_thickness 設(shè)置邊框的寬度border_inside_color 設(shè)置內(nèi)邊框的顏色border_outside_color 設(shè)置外邊框的顏色內(nèi)外邊框如果只設(shè)置一個的話，則認(rèn)為只顯示一個邊框。--><declare-styleable name="RoundImageView"><attr name="border_thickness" format="dimension" /><attr name="border_inside_color" format="color" /><attr name="border_outside_color" format="color" /></declare-styleable>

然后建立類RoundImageView.java

package com.eva.views;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.widget.ImageView;/*** 圓形ImageView，可設(shè)置最多兩個寬度不同且顏色不同的圓形邊框。* 來源的博客：http://blog.csdn.net/alan_biao/article/details/17379925* @author Alan*/ public class RoundImageView extends ImageView {private int mBorderThickness = 0;private Context mContext;private int defaultColor = 0xFFFFFFFF;// 如果只有其中一個有值，則只畫一個圓形邊框private int mBorderOutsideColor = 0;//圖片的外邊界private int mBorderInsideColor = 0;//圖片的內(nèi)邊界// 控件默認(rèn)長、寬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.RoundImageView);//邊界的寬度mBorderThickness = a.getDimensionPixelSize(R.styleable.RoundImageView_border_thickness, 0);//外邊界的顏色mBorderOutsideColor = a.getColor(R.styleable.RoundImageView_border_outside_color,defaultColor);//內(nèi)邊界的顏色mBorderInsideColor = a.getColor(R.styleable.RoundImageView_border_inside_color, defaultColor);}@Overrideprotected 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();}// 保證重新讀取圖片后不會因為圖片大小而改變控件寬、高的大小（針對寬、高為wrap_content布局的imageview，但會導(dǎo)致margin無效）// if (defaultWidth != 0 && defaultHeight != 0) {// LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(// defaultWidth, defaultHeight);// setLayoutParams(params);// }int radius = 0;if (mBorderInsideColor != defaultColor&& mBorderOutsideColor != defaultColor) {// 定義畫兩個邊框，分別為外圓邊框和內(nèi)圓邊框radius = (defaultWidth < defaultHeight ? defaultWidth: defaultHeight) / 2 - 2 * mBorderThickness;// 畫內(nèi)圓drawCircleBorder(canvas, radius + mBorderThickness / 2,mBorderInsideColor);// 畫外圓drawCircleBorder(canvas, radius + mBorderThickness+ mBorderThickness / 2, mBorderOutsideColor);} else if (mBorderInsideColor != defaultColor&& mBorderOutsideColor == defaultColor) {// 定義畫一個邊框radius = (defaultWidth < defaultHeight ? defaultWidth: defaultHeight) / 2 - mBorderThickness;drawCircleBorder(canvas, radius + mBorderThickness / 2,mBorderInsideColor);} else if (mBorderInsideColor == defaultColor&& mBorderOutsideColor != defaultColor) {// 定義畫一個邊框radius = (defaultWidth < defaultHeight ? defaultWidth: defaultHeight) / 2 - mBorderThickness;drawCircleBorder(canvas, radius + mBorderThickness / 2,mBorderOutsideColor);} else {// 沒有邊框radius = (defaultWidth < defaultHeight ? defaultWidth: defaultHeight) / 2;}Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight/ 2 - radius, null);}/*** 獲取裁剪后的圓形圖片* * @param radius* 半徑*/public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {Bitmap scaledSrcBmp;int diameter = radius * 2;// 為了防止寬高不相等，造成圓形圖片變形，因此截取長方形中處于中間位置最大的正方形圖片int bmpWidth = bmp.getWidth();int bmpHeight = bmp.getHeight();int squareWidth = 0, squareHeight = 0;int x = 0, y = 0;Bitmap squareBitmap;if (bmpHeight > bmpWidth) {// 高大于寬squareWidth = squareHeight = bmpWidth;x = 0;y = (bmpHeight - bmpWidth) / 2;// 截取正方形圖片squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,squareHeight);} else if (bmpHeight < bmpWidth) {// 寬大于高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導(dǎo)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;}/*** 邊緣畫圓*/private void drawCircleBorder(Canvas canvas, int radius, int color) {Paint paint = new Paint();/* 去鋸齒 */paint.setAntiAlias(true);paint.setFilterBitmap(true);paint.setDither(true);paint.setColor(color);/* 設(shè)置paint的　style　為STROKE：空心 */paint.setStyle(Paint.Style.STROKE);/* 設(shè)置paint的外框?qū)挾?*/paint.setStrokeWidth(mBorderThickness);canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint);}}

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最后，在布局文件中設(shè)置該控件（需要添加命名空間）

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:pv="http://schemas.android.com/apk/res/com.eva.views"android:layout_width="match_parent"android:layout_height="match_parent"android:background="#d6d6d6"android:orientation="vertical" ><com.eva.views.RoundImageViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@drawable/kale" android:layout_marginTop="16dp"android:layout_gravity="center_horizontal"pv:border_thickness="3dp"pv:border_inside_color="#50c0e9"/><com.eva.views.RoundImageViewandroid:id="@+id/image_id"android:layout_width="150dp"android:layout_height="150dp"android:src="@drawable/kale" android:layout_marginTop="16dp"android:layout_gravity="center_horizontal" pv:border_thickness="4dp"pv:border_inside_color="#50c0e9"pv:border_outside_color="#ffc641"/><com.eva.views.RoundImageViewandroid:layout_width="100dp"android:layout_height="100dp"android:src="@drawable/kale" android:layout_marginTop="16dp"android:layout_gravity="center_horizontal" pv:border_thickness="3dp"pv:border_inside_color="#d6d6d6"pv:border_outside_color="#ffc641"/></LinearLayout>

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我們在代碼中可以和用ImageView一樣來設(shè)置圖片

RoundImageView imageView = (RoundImageView)findViewById(R.id.image_id);imageView.setImageDrawable(getResources().getDrawable(R.drawable.saber));imageView.setImageResource(R.drawable.saber); 與50位技術(shù)專家面對面20年技術(shù)見證，附贈技術(shù)全景圖

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