1、自定義圓形控件?RoundImageView

package com.ronye.CustomView; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.PorterDuff; 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; import com.ronye.R;/*** Created by ${zyj} on 2015/8/27.* 描述： 自定義圓形圖片*/ 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;private int mBorderInsideColor = 0;// 控件默認長、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.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);}@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();}int radius = 0;if (mBorderInsideColor != defaultColor && mBorderOutsideColor != defaultColor) {// 定義畫兩個邊框，分別為外圓邊框和內圓邊框radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - 2 * mBorderThickness;// 畫內圓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 bmp* @param radius 半徑* @return*/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(),Bitmap.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(PorterDuff.Mode.SRC_IN));canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);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);/* 設置paint的　style　為STROKE：空心 */paint.setStyle(Paint.Style.STROKE);/* 設置paint的外框寬度 */paint.setStrokeWidth(mBorderThickness);canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint);} }

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2、定義自己的屬性配置文件：attr.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>

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3、在xml配置中使用控件：activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:imagecontrol="http://schemas.android.com/apk/res-auto" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="horizontal" > <!-- 沒有指定圓形ImageView屬性時，默認沒有外邊圓顏色 --> <!-- 需要將圖片資源自定為src ，或在程序中setImageResource(res) 不能設置background為圖片，這樣不能達到圓形效果--> <com.dxd.roundimageview.RoundImageView android:layout_width="100dp" android:layout_height="100dp" android:src="@drawable/img" />
<!-- border_outside_color 外部圓圈的顏色 --> <!-- border_inside_color 內部部圓圈的顏色 --> <!-- border_thickness 外圓和內圓的寬度 -->
<com.dxd.roundimageview.RoundImageView android:layout_width="100dp" android:layout_height="100dp" android:src="@drawable/img" imagecontrol:border_inside_color="#bc0978" imagecontrol:border_outside_color="#ba3456" imagecontrol:border_thickness="1dp" /> </LinearLayout>

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4、運行結果

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總結

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