github地址（欢迎下载Demo）

/zhouxu88/WXCircleAddPic

老习惯，先上图，着急用的朋友，直接带走Demo，先拿来用吧，毕竟老板催的紧，先把工作完成了，再看也来得及，是吧！

仿微信添加图片.gif 1、首先这是用GridView实现的

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:background="#fff"android:orientation="vertical"><!--展示上传的图片--><GridViewandroid:id="@+id/gridView"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_margin="15dp"android:columnWidth="60dp"android:horizontalSpacing="10dp"android:numColumns="auto_fit"android:verticalSpacing="10dp" /></LinearLayout>

Adapter

package com.dearxy.wxcircleaddpic;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import com.bumptech.glide.Glide;import java.util.List;/*** 展示上传的图片的GridView的适配器* <p>* 作者： 周旭 on /6/21/0021.* 邮箱：374952705@* 博客：/u/56db5d78044d*/public class GridViewAdapter extends android.widget.BaseAdapter {private Context mContext;private List<String> mList;private LayoutInflater inflater;public GridViewAdapter(Context mContext, List<String> mList) {this.mContext = mContext;this.mList = mList;inflater = LayoutInflater.from(mContext);}@Overridepublic int getCount() {//return mList.size() + 1;//因为最后多了一个添加图片的ImageView int count = mList == null ? 1 : mList.size() + 1;if (count > MainConstant.MAX_SELECT_PIC_NUM) {return mList.size();} else {return count;}}@Overridepublic Object getItem(int position) {return mList.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {convertView = inflater.inflate(R.layout.grid_item, parent,false);ImageView iv = (ImageView) convertView.findViewById(R.id.pic_iv);if (position < mList.size()) {//代表+号之前的需要正常显示图片String picUrl = mList.get(position); //图片路径 Glide.with(mContext).load(picUrl).into(iv);} else {iv.setImageResource(R.mipmap.zj);//最后一个显示加号图片}return convertView;}} MainActivity/*** 仿微信朋友圈添加图片的效果*/public class MainActivity extends AppCompatActivity {private static final String TAG = "MainActivity";private Context mContext;private GridView gridView;private ArrayList<String> mPicList = new ArrayList<>(); //上传的图片凭证的数据源private GridViewAdapter mGridViewAddImgAdapter; //展示上传的图片的适配器@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mContext = this;gridView = (GridView) findViewById(R.id.gridView);initGridView();}//初始化展示上传图片的GridViewprivate void initGridView() {mGridViewAddImgAdapter = new GridViewAdapter(mContext, mPicList);gridView.setAdapter(mGridViewAddImgAdapter);gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {if (position == parent.getChildCount() - 1) {//如果“增加按钮形状的”图片的位置是最后一张，且添加了的图片的数量不超过5张，才能点击if (mPicList.size() == MainConstant.MAX_SELECT_PIC_NUM) {//最多添加5张图片 viewPluImg(position);} else {//添加凭证图片selectPic(MainConstant.MAX_SELECT_PIC_NUM - mPicList.size());}} else {viewPluImg(position);}}});}//查看大图private void viewPluImg(int position) {Intent intent = new Intent(mContext, PlusImageActivity.class);intent.putStringArrayListExtra(MainConstant.IMG_LIST, mPicList);intent.putExtra(MainConstant.POSITION, position);startActivityForResult(intent, MainConstant.REQUEST_CODE_MAIN);}/*** 打开相册或者照相机选择凭证图片，最多5张** @param maxTotal 最多选择的图片的数量*/private void selectPic(int maxTotal) {PictureSelectorConfig.initMultiConfig(this, maxTotal);}// 处理选择的照片的地址private void refreshAdapter(List<LocalMedia> picList) {for (LocalMedia localMedia : picList) {//被压缩后的图片路径if (localMedia.isCompressed()) {String compressPath = localMedia.getCompressPath(); //压缩后的图片路径mPicList.add(compressPath); //把图片添加到将要上传的图片数组中mGridViewAddImgAdapter.notifyDataSetChanged();}}}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if (resultCode == RESULT_OK) {switch (requestCode) {case PictureConfig.CHOOSE_REQUEST:// 图片选择结果回调refreshAdapter(PictureSelector.obtainMultipleResult(data));// 例如 LocalMedia 里面返回三种path// 1.media.getPath(); 为原图path// 2.media.getCutPath();为裁剪后path，需判断media.isCut();是否为true// 3.media.getCompressPath();为压缩后path，需判断media.isCompressed();是否为true// 如果裁剪并压缩了，以取压缩路径为准，因为是先裁剪后压缩的break;}}if (requestCode == MainConstant.REQUEST_CODE_MAIN && resultCode == MainConstant.RESULT_CODE_VIEW_IMG) {//查看大图页面删除了图片ArrayList<String> toDeletePicList = data.getStringArrayListExtra(MainConstant.IMG_LIST); //要删除的图片的集合 mPicList.clear();mPicList.addAll(toDeletePicList);mGridViewAddImgAdapter.notifyDataSetChanged();}}}

总结：其实原理就是把数据的size+1,做为添加按钮的放置，然后判断下有9张图就不显示添加按钮，并且size也不+1，就这样，一个带添加按钮的GridView就好了~有什么不懂得可以留言。

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