Android圓形圖片自定義控件

jopen 9年前發布 | 191K 次閱讀 Android Android開發移動開發
Android圓形圖片控件效果圖如下：
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，可設置最多兩個寬度不同且顏色不同的圓形邊框。  
 * 設置顏色在xml布局文件中由自定義屬性配置參數指定  
 */  
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);  
    }  

    @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 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);  
        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);  
    }  
}  </pre><strong>1、定義自己的屬性配置文件：attr.xml</strong> <pre class="brush:xml; toolbar: true; auto-links: false;">    <?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>  </pre><strong>2、在xml配置中使用控件：activity_main.xml</strong> <pre class="brush:xml; toolbar: true; auto-links: false;">    <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>  </pre><strong>3、主Activity中沒有相關代碼，直接加載布局文件即可。</strong> <p></p>





來自：http://blog.csdn.net/android_dong/article/details/41989499
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Android Android開發移動開發
Android圓形圖片自定義控件

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