Android 仿QQ讨论组头像

一、效果图

二、实现

基本实现过程：

1.将原图片读取为bitmap

2.在Canvas画布上计算出图片位置，并绘制新的图片。

（ps:计算位置对我来说是难点，花了好长时间）；

三、源码

1.布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:padding="16dp"android:background="#AEAEAE"android:orientation="vertical"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"android:orientation="horizontal"><ImageViewandroid:id="@+id/img_src_0"android:layout_width="0dp"android:layout_height="match_parent"android:padding="5dp"android:layout_weight="1"android:adjustViewBounds="true"/><ImageViewandroid:id="@+id/img_src_1"android:layout_width="0dp"android:layout_height="match_parent"android:padding="5dp"android:layout_weight="1"android:adjustViewBounds="true"/><ImageViewandroid:id="@+id/img_src_2"android:layout_width="0dp"android:layout_height="match_parent"android:padding="5dp"android:layout_weight="1"android:adjustViewBounds="true"/><ImageViewandroid:id="@+id/img_src_3"android:layout_width="0dp"android:layout_height="match_parent"android:padding="5dp"android:layout_weight="1"android:adjustViewBounds="true"/><ImageViewandroid:id="@+id/img_src_4"android:layout_width="0dp"android:layout_height="match_parent"android:padding="5dp"android:layout_weight="1"android:adjustViewBounds="true"/></LinearLayout><ImageViewandroid:id="@+id/img_result_2"android:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"/><ImageViewandroid:id="@+id/img_result_3"android:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"/><ImageViewandroid:id="@+id/img_result_4"android:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"/><ImageViewandroid:id="@+id/img_result_5"android:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"/>
</LinearLayout>

2.Activity

package com.hand.px_demo.QQHead;import android.app.Activity;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.widget.ImageView;import com.hand.px_demo.R;import java.util.ArrayList;/*** Created by panx on 2016/12/12.*/
public class QHeadActivity extends Activity{private ArrayList<Bitmap> bitmaps = new ArrayList<Bitmap>();private ImageView img_src_0;private ImageView img_src_1;private ImageView img_src_2;private ImageView img_src_3;private ImageView img_src_4;private ImageView img_result_2;private ImageView img_result_3;private ImageView img_result_4;private ImageView img_result_5;private HeadManager headManager;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_qq_head);headManager = new HeadManager();initView();initData();}private void initView(){img_src_0 = (ImageView)findViewById(R.id.img_src_0);img_src_1 = (ImageView)findViewById(R.id.img_src_1);img_src_2 = (ImageView)findViewById(R.id.img_src_2);img_src_3 = (ImageView)findViewById(R.id.img_src_3);img_src_4 = (ImageView)findViewById(R.id.img_src_4);img_result_2 = (ImageView)findViewById(R.id.img_result_2);img_result_3 = (ImageView)findViewById(R.id.img_result_3);img_result_4 = (ImageView)findViewById(R.id.img_result_4);img_result_5 = (ImageView)findViewById(R.id.img_result_5);}private void initData(){//从drawable中获取图片资源的bitmapResources r = this.getResources();Bitmap bitmap0 = BitmapFactory.decodeResource(r,R.drawable.src_head_1);Bitmap bitmap1 = BitmapFactory.decodeResource(r,R.drawable.src_head_2);Bitmap bitmap2 = BitmapFactory.decodeResource(r,R.drawable.src_head_3);Bitmap bitmap3 = BitmapFactory.decodeResource(r,R.drawable.src_head_4);Bitmap bitmap4 = BitmapFactory.decodeResource(r,R.drawable.src_head_5);bitmaps.add(bitmap0);bitmaps.add(bitmap1);bitmaps.add(bitmap2);bitmaps.add(bitmap3);bitmaps.add(bitmap4);img_src_0.setImageBitmap(bitmap0);img_src_1.setImageBitmap(bitmap1);img_src_2.setImageBitmap(bitmap2);img_src_3.setImageBitmap(bitmap3);img_src_4.setImageBitmap(bitmap4);Bitmap r2Bitmap = headManager.getBitMap(bitmaps, 2);Bitmap r3Bitmap = headManager.getBitMap(bitmaps, 3);Bitmap r4Bitmap = headManager.getBitMap(bitmaps, 4);Bitmap r5Bitmap = headManager.getBitMap(bitmaps, 5);img_result_2.setImageBitmap(r2Bitmap);img_result_3.setImageBitmap(r3Bitmap);img_result_4.setImageBitmap(r4Bitmap);img_result_5.setImageBitmap(r5Bitmap);}}

3.绘制图片的核心代码

（1）压缩图片

  /*对原始图片进行缩放*/public Bitmap zoomImage(Bitmap bgimage, double newWidth,double newHeight) {// 获取这个图片的宽和高float width = bgimage.getWidth();float height = bgimage.getHeight();// 创建操作图片用的matrix对象Matrix matrix = new Matrix();// 计算宽高缩放率float scaleWidth = ((float) newWidth) / width;float scaleHeight = ((float) newHeight) / height;// 缩放图片动作matrix.postScale(scaleWidth, scaleHeight);Bitmap bitmap = Bitmap.createBitmap(bgimage, 0, 0, (int) width,(int) height, matrix, true);return bitmap;}

（2）将图片改成圆角

private Bitmap makeRoundCorner(Bitmap bitmap, int width, int height) {int left = 0, top = 0, right = width, bottom = height;float roundPx = height / 2;if (width > height) {left = (width - height) / 2;top = 0;right = left + height;bottom = height;} else if (height > width) {left = 0;top = (height - width) / 2;right = width;bottom = top + width;roundPx = width / 2;}Bitmap output = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);Canvas canvas = new Canvas(output);int color = 0xff424242;Paint paint = new Paint();Rect rect = new Rect(left, top, right, bottom);RectF rectF = new RectF(rect);paint.setAntiAlias(true);canvas.drawARGB(0, 0, 0, 0);paint.setColor(color);canvas.drawRoundRect(rectF, roundPx, roundPx, paint);paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));canvas.drawBitmap(bitmap, rect, rect, paint);return output;}

（3）获取绘制的坐标

private ArrayList<Point> getFivePoints(int point_x, int point_y, int d) {ArrayList<Point> points = new ArrayList<Point>();//圆心至图片的距离int wr = point_y - d;//大圆心至小圆心的距离int R = wr + d / 2;//头像半径,头像直径为dint r = d / 2;int RCos18 = (int) (R * (Math.cos(0.1 * Math.PI)));int RSin18 = (int) (R * (Math.sin(0.1 * Math.PI)));int RCos36 = (int) (R * (Math.cos(0.2 * Math.PI)));int RSin36 = (int) (R * (Math.sin(0.2 * Math.PI)));Point point1 = new Point(point_x - r, 0);Point point2 = new Point();point2.x = RCos18 + point_x - r;point2.y = point_y - RSin18 - r;Point point3 = new Point();point3.x = RSin36 + point_x - r;point3.y = point_y + RCos36 - r;Point point4 = new Point();point4.x = point_x - RSin36 - r;point4.y = point3.y;Point point5 = new Point();point5.x = point_x - (int) (RCos18) - r;point5.y = point2.y;points.add(point1);points.add(point2);points.add(point3);points.add(point4);points.add(point5);return points;}

（4）该类全部源码

package com.hand.px_demo.QQHead;import android.app.Activity;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.widget.ImageView;import com.hand.px_demo.R;import java.util.ArrayList;/*** Created by panx on 2016/12/12.*/
public class QHeadActivity extends Activity{private ArrayList<Bitmap> bitmaps = new ArrayList<Bitmap>();private ImageView img_src_0;private ImageView img_src_1;private ImageView img_src_2;private ImageView img_src_3;private ImageView img_src_4;private ImageView img_result_2;private ImageView img_result_3;private ImageView img_result_4;private ImageView img_result_5;private HeadManager headManager;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_qq_head);headManager = new HeadManager();initView();initData();}private void initView(){img_src_0 = (ImageView)findViewById(R.id.img_src_0);img_src_1 = (ImageView)findViewById(R.id.img_src_1);img_src_2 = (ImageView)findViewById(R.id.img_src_2);img_src_3 = (ImageView)findViewById(R.id.img_src_3);img_src_4 = (ImageView)findViewById(R.id.img_src_4);img_result_2 = (ImageView)findViewById(R.id.img_result_2);img_result_3 = (ImageView)findViewById(R.id.img_result_3);img_result_4 = (ImageView)findViewById(R.id.img_result_4);img_result_5 = (ImageView)findViewById(R.id.img_result_5);}private void initData(){//从drawable中获取图片资源的bitmapResources r = this.getResources();Bitmap bitmap0 = BitmapFactory.decodeResource(r,R.drawable.src_head_1);Bitmap bitmap1 = BitmapFactory.decodeResource(r,R.drawable.src_head_2);Bitmap bitmap2 = BitmapFactory.decodeResource(r,R.drawable.src_head_3);Bitmap bitmap3 = BitmapFactory.decodeResource(r,R.drawable.src_head_4);Bitmap bitmap4 = BitmapFactory.decodeResource(r,R.drawable.src_head_5);bitmaps.add(bitmap0);bitmaps.add(bitmap1);bitmaps.add(bitmap2);bitmaps.add(bitmap3);bitmaps.add(bitmap4);img_src_0.setImageBitmap(bitmap0);img_src_1.setImageBitmap(bitmap1);img_src_2.setImageBitmap(bitmap2);img_src_3.setImageBitmap(bitmap3);img_src_4.setImageBitmap(bitmap4);Bitmap r2Bitmap = headManager.getBitMap(bitmaps, 2);Bitmap r3Bitmap = headManager.getBitMap(bitmaps, 3);Bitmap r4Bitmap = headManager.getBitMap(bitmaps, 4);Bitmap r5Bitmap = headManager.getBitMap(bitmaps, 5);img_result_2.setImageBitmap(r2Bitmap);img_result_3.setImageBitmap(r3Bitmap);img_result_4.setImageBitmap(r4Bitmap);img_result_5.setImageBitmap(r5Bitmap);}}

demo地址：https://github.com/panxu/demo.git