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Android開發之制作圓形頭像自定義View,直接引用工具類,加快開發速度。帶有源代碼學習...

作者:程式員小冰,

Android開發之制作圓形頭像自定義View,直接引用工具類,加快開發速度。帶有源代碼學習

大家都知道。現在好多頭像都是圓形的,不再是以前的正方形或者長方形。

是以今天給大家帶來的就是如何制作一個圓形頭像。下面是效果圖:

Android開發之制作圓形頭像自定義View,直接引用工具類,加快開發速度。帶有源代碼學習...

當然利用一個自定義View內建ImageView即可。

package com.qq986945193.zoomimageviewrounddemo;

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;

/**
 * 微網誌:http://weibo.com/mcxiaobing
 * ============================================================================
 * Copyright (c) 2015-2016 QQ986945193 All rights reserved.
 * ----------------------------------------------------------------------------
 * 類名:自定義圓形頭像View
 * ----------------------------------------------------------------------------
 * 功能描述:javascript:void(0)
 * ----------------------------------------------------------------------------
 */

public class RoundImageView extends ImageView {
    private int mBorderThickness = 0;
    private Context mContext;
    private int defaultColor = 0xFFFFFFFF;
    // 如果隻有其中一個有值,則隻畫一個圓形邊框
    private int mBorderOutsideColor = 0;// 圖檔的外邊界
    private int mBorderInsideColor = 0;// 圖檔的内邊界
    // 控件預設長、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.RoundImageView);
        // 邊界的寬度
        mBorderThickness = a.getDimensionPixelSize(
                R.styleable.RoundImageView_border_thickness, 0);
        // 外邊界的顔色
        mBorderOutsideColor = a.getColor(
                R.styleable.RoundImageView_border_outside_color, defaultColor);
        // 内邊界的顔色
        mBorderInsideColor = a.getColor(
                R.styleable.RoundImageView_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(Config.ARGB_8888, true);
        if (defaultWidth == 0) {
            defaultWidth = getWidth();
        }
        if (defaultHeight == 0) {
            defaultHeight = getHeight();
        }
        // 保證重新讀取圖檔後不會因為圖檔大小而改變控件寬、高的大小(針對寬、高為wrap_content布局的imageview,但會導緻margin無效)
        // if (defaultWidth != 0 && defaultHeight != 0) {
        // LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
        // defaultWidth, defaultHeight);
        // setLayoutParams(params);
        // }

        int radius = 0;
        if (mBorderInsideColor != defaultColor
                && mBorderOutsideColor != defaultColor) {// 定義畫兩個邊框,分别為外圓邊框和内圓邊框
            radius = (defaultWidth < defaultHeight ? defaultWidth
                    : defaultHeight) / 2 - 2 * mBorderThickness;
            // 畫内圓
            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檔
     * 
     * javascript:void(0)
     * @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,造成圓形圖檔變形,是以截取長方形中處于中間位置最大的正方形圖檔
        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;
            // 截取正方形圖檔
            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);
        // bitmap回收(recycle導緻在布局檔案XML看不到效果)
        // bmp.recycle();
        // squareBitmap.recycle();
        // scaledSrcBmp.recycle();
        bmp = null;
        squareBitmap = null;
        scaledSrcBmp = null;
        return output;
    }

    /**
     * 邊緣畫圓
     * 
     * javascript:void(0)
     */
    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);
    }

}      
<com.qq986945193.zoomimageviewrounddemo.RoundImageView
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_centerInParent="true"
        android:scaleType="fitCenter"
        android:src="@drawable/img" />      
<!-- 圓形ImageView -->
    <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>      

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