首页 > 用自定义的RoundImageView来实现圆形图片(可加边框)

用自定义的RoundImageView来实现圆形图片(可加边框)

本文的控件来自:http://blog.csdn.net/alan_biao/article/details/17379925

这个控件不同于之前介绍过的那个框架,这个仅仅能过将图片裁剪为圆形,没能弄成椭圆,也没有android:scaleType属性。但他可以提供两重边框,对于简单的使用来说,是完全够用的。

使用方式和之前一样,首先先配置attrs.xml

    <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> 

然后建立类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;/*** 圆形ImageView,可设置最多两个宽度不同且颜色不同的圆形边框。* 来源的博客: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;// 如果只有其中一个有值,则只画一个圆形边框private int mBorderOutsideColor = 0;//图片的外边界private int mBorderInsideColor = 0;//图片的内边界// 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.RoundImageView);//边界的宽度mBorderThickness = a.getDimensionPixelSize(R.styleable.RoundImageView_border_thickness, 0);//外边界的颜色mBorderOutsideColor = a.getColor(R.styleable.RoundImageView_border_outside_color,defaultColor);//内边界的颜色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);}}

 

最后,在布局文件中设置该控件(需要添加命名空间)

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>

 

我们在代码中可以和用ImageView一样来设置图片

        RoundImageView imageView = (RoundImageView)findViewById(R.id.image_id);imageView.setImageDrawable(getResources().getDrawable(R.drawable.saber));imageView.setImageResource(R.drawable.saber);

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