自定义view—仿微信头像

效果图:

自定义view—仿微信头像

已经上传到github:

源码地址

只是初步完成了，后续还会有一些修改，也会在博客更新

package smt.weixingroupchat;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;

import java.util.ArrayList;
import java.util.List;

/**

• 微信头像

• Created by Administrator on 2016/8/11.
  */
  public class GroupChatHead extends View {

private Paint mPaint;

private Context mContext;
/**
 * 头像集合
 */
private List mBitmapList;
/**
 * 控件的宽
 */
private int mWidth;
/**
 * 控件的高
 */
private int mHeigth;
/**
 * 每一个小头像的宽度
 */
private int mOneWidth;
/**
 * 每一个小头像的高度
 */
private int mOneHeigth;
/**
 * 间距
 */
private int mSpacing = 15;

public GroupChatHead(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init(context, attrs);
}


public GroupChatHead(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
}

public GroupChatHead(Context context) {
    this(context, null);
}


private void init(Context context, AttributeSet attrs) {
    this.mContext = context;
    mPaint = new Paint();
    mPaint.setAntiAlias(true);
    mPaint.setStrokeWidth(10);
    mPaint.setStyle(Paint.Style.FILL);
}

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);
    mWidth = w;
    mHeigth = h;
}


@Override
protected void onDraw(Canvas canvas) {

    switch (mBitmapList.size()) {
        case 1:
            mOneWidth = mWidth;
            mOneHeigth = mHeigth;
            break;
        case 2:
            mOneWidth = mWidth / 2;
            mOneHeigth = mHeigth / 2;
            break;
        case 3:
            mOneWidth = mWidth / 2;
            mOneHeigth = mHeigth / 2;
            break;
        case 4:
            mOneWidth = mWidth / 2;
            mOneHeigth = mHeigth / 2;
            break;
        case 5:
        case 6:
        case 7:
        case 8:
        case 9:
            mOneWidth = mWidth / 3;
            mOneHeigth = mHeigth / 3;
            break;
        default:
            mOneWidth = mWidth / 3;
            mOneHeigth = mHeigth / 3;
            break;
    }

    mBitmapList = zoomImg(mBitmapList, mOneWidth, mOneHeigth);
    if (mBitmapList != null && mBitmapList.size() > 0) {
        Bitmap bitmap = getBitmap(mBitmapList);
        canvas.drawBitmap(bitmap, 0, 0, mPaint);
    }
}
/**
 * 组合图片
 *
 * @param arr
 * @return
 */
public Bitmap getBitmap(List arr) {
    Bitmap bitmap = Bitmap.createBitmap(mWidth, mHeigth,
            Bitmap.Config.RGB_565);

    Canvas canvas = new Canvas(bitmap);

    switch (arr.size()) {
        case 1:
        case 2:
            drawBitmap12(canvas, arr);
            break;
        case 3:
        case 4:
            drawBitmap34(canvas, arr);
            break;
        case 5:
        case 6:
            drawBitmap56(canvas, arr);
            break;
        case 7:
        case 8:
        case 9:
            drawBitmap789(canvas, arr);
            break;
        default:
            drawBitmap789(canvas, arr);
            break;
    }

    return bitmap;
}

/**
 * @param canvas
 * @param arr
 */
public void drawBitmap12(Canvas canvas, List arr) {
    if (arr.size() == 1) {
        //1
        canvas.drawBitmap(arr.get(0), 0, 0, null);
    } else {
        //2
        canvas.drawBitmap(arr.get(0), 0, mOneHeigth / 2, null);
        canvas.drawBitmap(arr.get(1), mOneWidth, mOneHeigth / 2, null);
    }
}

/**
 * @param canvas
 * @param arr
 */
public void drawBitmap34(Canvas canvas, List arr) {
    int i = 0;
    if (arr.size() == 3) {
        //3
        i = 1;
        canvas.drawBitmap(arr.get(0), mOneWidth / 2, 0, null);//1
    } else {
        //4
        i = 0;
        canvas.drawBitmap(arr.get(0), 0, 0, null);//1
        canvas.drawBitmap(arr.get(1), mOneWidth, 0, null);//2

    }
    canvas.drawBitmap(arr.get(2 - i), 0, mOneHeigth, null);
    canvas.drawBitmap(arr.get(3 - i), mOneWidth, mOneHeigth, null);

}

/**
 * @param canvas
 * @param arr
 */
public void drawBitmap56(Canvas canvas, List arr) {
    int i = 0;
    if (arr.size() == 5) {
        //5
        i = 1;
        canvas.drawBitmap(arr.get(0), mOneWidth / 2, mOneHeigth / 2, null);//1
        canvas.drawBitmap(arr.get(1), mOneWidth / 2 + mOneWidth, mOneHeigth / 2, null);//2
    } else {
        //6
        i = 0;
        canvas.drawBitmap(arr.get(0), 0, mOneHeigth / 2, null);//1
        canvas.drawBitmap(arr.get(1), mOneWidth, mOneHeigth / 2, null);//2
        canvas.drawBitmap(arr.get(2), mOneWidth * 2, mOneHeigth / 2, null);//3
    }
    //下部分
    canvas.drawBitmap(arr.get(3 - i), 0, mOneHeigth / 2 + mOneHeigth, null);//1
    canvas.drawBitmap(arr.get(4 - i), mOneWidth, mOneHeigth / 2 + mOneHeigth, null);//2
    canvas.drawBitmap(arr.get(5 - i), mOneWidth * 2, mOneHeigth / 2 + mOneHeigth, null);//3


}

/**
 * @param canvas
 * @param arr
 */
public void drawBitmap789(Canvas canvas, List arr) {
    //上面部分
    int i = 0;
    if (arr.size() == 7) {
        i = 2;
        canvas.drawBitmap(arr.get(0), mOneWidth, 0, null);//1
    } else if (arr.size() == 8) {
        i = 1;
        canvas.drawBitmap(arr.get(0), mOneWidth / 2, 0, null);//1
        canvas.drawBitmap(arr.get(1), mOneWidth + mOneHeigth / 2, 0, null);//2
    } else {
        canvas.drawBitmap(arr.get(0), 0, 0, null);//1
        canvas.drawBitmap(arr.get(1), mOneWidth, 0, null);//2
        canvas.drawBitmap(arr.get(2), mOneWidth * 2, 0, null);//3
    }
    //中间部分
    canvas.drawBitmap(arr.get(3 - i), 0, mOneHeigth, null);//4
    canvas.drawBitmap(arr.get(4 - i), mOneWidth, mOneHeigth, null);//5
    canvas.drawBitmap(arr.get(5 - i), mOneWidth * 2, mOneHeigth, null);//6
    //下面部分
    canvas.drawBitmap(arr.get(6 - i), 0, mOneHeigth * 2, null);//4
    canvas.drawBitmap(arr.get(7 - i), mOneWidth, mOneHeigth * 2, null);//5
    canvas.drawBitmap(arr.get(8 - i), mOneWidth * 2, mOneHeigth * 2, null);//6
}

/**
 * 处理图片
 *
 * @param mBitmapList 所要转换的bitmap
 * @param newWidth    新的宽
 * @param newHeight   新的高
 * @return 指定宽高的bitmap
 */
public List zoomImg(List mBitmapList, int newWidth, int newHeight) {
    if (mBitmapList == null || mBitmapList.size() == 0) {
        return null;
    }

    ArrayList bitmaps = new ArrayList<>();

    for (int i = 0; i < mBitmapList.size(); i++) {

        // 获得图片的宽高
        int width = mBitmapList.get(i).getWidth();
        int height = mBitmapList.get(i).getHeight();
        // 计算缩放比例
        float scaleWidth = ((float) newWidth) / width;
        float scaleHeight = ((float) newHeight) / height;
        // 取得想要缩放的matrix参数
        Matrix matrix = new Matrix();
        matrix.postScale(scaleWidth, scaleHeight);
        // 得到新的图片
        Bitmap newbm = Bitmap.createBitmap(mBitmapList.get(i), 0, 0, width, height, matrix, true);
        bitmaps.add(newbm);
    }
    return bitmaps;
}


/**
 * 设置图片集
 *
 * @param bm
 */
public void setBitmaps(List bm) {
    mBitmapList = bm;
    //重绘
    invalidate();
}


/**
 * 设置间距
 *
 * @param spacing
 */
public void setSpacing(int spacing) {
    mSpacing = spacing;
}

}