GridView动态删除Item

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".activity.MainActivity">
    <GridView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/gridView"
        android:numColumns="4"></GridView>
</LinearLayout>

Article.java

package com.pingyijinren.helloworld.model;

/**
 * Created by Administrator on 2016/6/3 0003.
 */
public class Article {
    private int imageId;
    private String name;

    public Article(int imageId,String name){
        this.imageId=imageId;
        this.name=name;
    }

    public int getImageId() {
        return imageId;
    }

    public String getName() {
        return name;
    }
}

grid_item.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:id="@+id/image"/>

        <TextView
            android:layout_width="match_parent"
            android:layout_height="20dp"
            android:id="@+id/name"/>
    </LinearLayout>

    <ImageView
        android:layout_width="20dp"
        android:layout_height="20dp"
        android:layout_gravity="right|top"
        android:src="@drawable/cancel"
        android:id="@+id/delete"/>
</FrameLayout>

ArticleAdapter.java

package com.pingyijinren.helloworld.adapter;

import android.content.Context;
import android.text.Layout;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.pingyijinren.helloworld.R;
import com.pingyijinren.helloworld.model.Article;

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

/**
 * Created by Administrator on 2016/6/3 0003.
 */
public class ArticleAdapter extends ArrayAdapter<Article>{
    private boolean ifShowDelete=false;
    private ArrayList<Article> arrayListArticle;
    private int index;
    public ArticleAdapter(Context context, int resource, List<Article> objects) {
        super(context, resource, objects);
        arrayListArticle=(ArrayList<Article>)objects;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder;
        if(convertView==null){
            convertView= LayoutInflater.from(getContext()).inflate(R.layout.grid_item,null);
            viewHolder=new ViewHolder();
            viewHolder.image=(ImageView) convertView.findViewById(R.id.image);
            viewHolder.name=(TextView)convertView.findViewById(R.id.name);
            viewHolder.delete=(ImageView)convertView.findViewById(R.id.delete);
            convertView.setTag(viewHolder);
        }
        else{
            viewHolder=(ViewHolder) convertView.getTag();
        }
        Article article=getItem(position);
        viewHolder.image.setImageResource(article.getImageId());
        viewHolder.name.setText(article.getName());

        index=position;
        if(ifShowDelete){
            viewHolder.delete.setVisibility(View.VISIBLE);
            viewHolder.delete.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    arrayListArticle.remove(index);
                    notifyDataSetChanged();
                }
            });
        }
        else{
            viewHolder.delete.setVisibility(View.GONE);
        }
        return convertView;
    }

    private class ViewHolder{
        public ImageView image;
        public TextView name;
        public ImageView delete;
    }

    public void setIfShowDelete(boolean ifShowDelete) {
        this.ifShowDelete = ifShowDelete;
    }
}

MainActivity.java

package com.pingyijinren.helloworld.activity;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;

import com.pingyijinren.helloworld.R;
import com.pingyijinren.helloworld.adapter.ArticleAdapter;
import com.pingyijinren.helloworld.model.Article;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    private GridView gridView;
    private ArrayList<Article> arrayListArticle;
    private ArticleAdapter articleAdapter;
    private boolean ifShowDelete=false;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        gridView=(GridView)findViewById(R.id.gridView);
        arrayListArticle=new ArrayList<Article>();
        arrayListArticle.add(new Article(R.drawable.first_image,"frist"));
        arrayListArticle.add(new Article(R.drawable.second_image,"second"));
        articleAdapter=new ArticleAdapter(MainActivity.this,R.layout.grid_item,arrayListArticle);
        gridView.setAdapter(articleAdapter);

        gridView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
                articleAdapter.setIfShowDelete(true);
                articleAdapter.notifyDataSetChanged();
                ifShowDelete=true;
                return false;
            }
        });
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if(keyCode==KeyEvent.KEYCODE_BACK){
            if(ifShowDelete==true){
                if(arrayListArticle.size()==0){
                    finish();
                }
                else{
                    articleAdapter.setIfShowDelete(false);
                    articleAdapter.notifyDataSetChanged();
                    ifShowDelete=false;
                }

            }
            else{
                finish();
            }
        }
        return false;
    }
}