本例子实现在GridView的最后显示一个增加图片，点击图片动态增加内容item。
1.main.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" > <GridView android:id="@+id/gv_test" android:numColumns="3" android:layout_width="match_parent" android:layout_height="match_parent" /></RelativeLayout>
2.grid_item.xml：
<?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:orientation="vertical" > <ImageView android:id="@+id/item" android:layout_width="wrap_content" android:layout_height="wrap_content" /></LinearLayout>
3.GridViewAdapter.java:
package com.yayun.gridviewdemo;import java.util.List;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;public class GridViewAdapter extends BaseAdapter { private Context context; private List<Integer> list; LayoutInflater layoutInflater; private ImageView mImageView; public GridViewAdapter(Context context, List<Integer> list) { this.context = context; this.list = list; layoutInflater = LayoutInflater.from(context); } @Override public int getCount() { return list.size()+1;//注意此处 } @Override public Object getItem(int position) { return list.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { convertView = layoutInflater.inflate(R.layout.grid_item, null); mImageView = (ImageView) convertView.findViewById(R.id.item); if (position < list.size()) { mImageView.setBackgroundResource(list.get(position)); }else{ mImageView.setBackgroundResource(R.drawable.pic3);//最后一个显示加号图片 } return convertView; }}4.MainActivity.java:
package com.yayun.gridviewdemo;import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.support.v7.app.ActionBarActivity;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.GridView;import android.widget.Toast;public class MainActivity extends ActionBarActivity { private List<Integer> mDatas;private GridView mGridView;private GridViewAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mGridView=(GridView) findViewById(R.id.gv_test); initDatas(); adapter=new GridViewAdapter(MainActivity.this,mDatas); mGridView.setAdapter(adapter); mGridView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { if(position==parent.getChildCount()-1){ mDatas.add(R.drawable.pic1); Toast.makeText(MainActivity.this, "您点击了添加", 1).show(); adapter=new GridViewAdapter(MainActivity.this, mDatas); mGridView.setAdapter(adapter); adapter.notifyDataSetChanged(); } } }); } private void initDatas() { mDatas=new ArrayList<>(); mDatas.add(R.drawable.pic1); mDatas.add(R.drawable.pic1); mDatas.add(R.drawable.pic1); mDatas.add(R.drawable.pic1); mDatas.add(R.drawable.pic1); } }5.运行项目：
参考上一篇博客的删除，可以实现动态增加和动态删除功能。
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