github地址（欢迎下载Demo）
https://github.com/zhouxu88/WXCircleAddPic
*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="http://schemas.android.com/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-->
<GridView
android: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 2017/6/21/0021.
* 邮箱：374952705@qq.com
* 博客：http://www.jianshu.com/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);
} @Override
public int getCount() {
//return mList.size() + 1;//因为最后多了一个添加图片的ImageView
int count = mList == null ? : mList.size() + ;
if (count > MainConstant.MAX_SELECT_PIC_NUM) {
return mList.size();
} else {
return count;
}
} @Override
public Object getItem(int position) {
return mList.get(position);
} @Override
public long getItemId(int position) {
return position;
} @Override
public 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 @Override
protected 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GridView
private void initGridView() {
mGridViewAddImgAdapter = new GridViewAdapter(mContext, mPicList);
gridView.setAdapter(mGridViewAddImgAdapter);
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
if (position == parent.getChildCount() - ) {
//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();
}
}
} @Override
protected 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。