• Android圆形图片--自己定义控件


    Android圆形图片控件效果图例如以下:



    代码例如以下:

    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;
    
    /**
     * 圆形ImageView,可设置最多两个宽度不同且颜色不同的圆形边框。
     * 设置颜色在xml布局文件里由自己定义属性配置參数指定
     */
    public class RoundImageView extends ImageView {
    	private int mBorderThickness = 0;
    	private Context mContext;
    	private int defaultColor = 0xFFFFFFFF;
    	// 假设仅仅有当中一个有值,则仅仅画一个圆形边框
    	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(Bitmap.Config.ARGB_8888, true);
    		if (defaultWidth == 0) {
    			defaultWidth = getWidth();
    		}
    		if (defaultHeight == 0) {
    			defaultHeight = getHeight();
    		}
    		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); 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); } }


    1、定义自己的属性配置文件: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>
    


    2、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"
        >
    
        <!-- 没有指定圆形ImageView属性时,默认没有外边圆颜色 -->
        <!-- 须要将图片资源自定为src 。或在程序中setImageResource(res) 不能设置background为图片,这样不能达到圆形效果-->
        <com.dxd.roundimageview.RoundImageView 
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:src="@drawable/img"
            />
        <!-- border_outside_color 外部圆圈的颜色 -->
        <!-- border_inside_color 内部部圆圈的颜色 -->
        <!-- border_thickness 外圆和内圆的宽度 -->
        <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中没有相关代码。直接载入布局文件就可以。








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  • 原文地址:https://www.cnblogs.com/jzssuanfa/p/6916381.html
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