Android圓形圖片--自訂控制項

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Android圓形圖片控制項如下：

代碼如下:

RoundImageView.java

package com.dxd.roundimageview;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.alan.myimageview.R;/** * 圓形ImageView，可設定最多兩個寬度不同且顏色不同的圓形邊框。 * 設定顏色在xml布局檔案中由自訂屬性配置參數指定 */public class RoundImageView extends ImageView {private int mBorderThickness = 0;private Context mContext;private int defaultColor = 0xFFFFFFFF;// 如果只有其中一個有值，則只畫一個圓形邊框private int mBorderOutsideColor = 0;private int mBorderInsideColor = 0;// 控制項預設長、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);}/** * 擷取裁剪後的圓形圖片 * @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於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) {// 高大於寬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) {// 寬大於高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;}/** * 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);/* 設定paint的　style　為STROKE：空心 */paint.setStyle(Paint.Style.STROKE);/* 設定paint的外框寬度 */paint.setStrokeWidth(mBorderThickness);canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint);}}

1、定義自己的屬性設定檔：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>

2、在xml配置中使用控制項：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，預設沒有外邊圓顏色 -->    <!-- 需要將圖片資源自定為src ，或在程式中setImageResource(res) 不能設定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>

3、主Activity中沒有相關代碼，直接載入布局檔案即可。

Android圓形圖片--自訂控制項