assets+json+下拉+上拉

1.activity_main布局

<com.example.adapter.pull_grid.PullToRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:id="@+id/refresh_view"

    android:layout_width="match_parent"

    android:layout_height="match_parent" >

    <include layout="@layout/refresh_head" />

    <com.example.adapter.pull_grid.PullableGridView

        android:id="@+id/gv"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

       >

    </com.example.adapter.pull_grid.PullableGridView>

    <include layout="@layout/load_more" />

</com.example.adapter.pull_grid.PullToRefreshLayout>

2.lv_item布局

<?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="horizontal" >

    

    

    <ImageView

        android:id="@+id/iv1"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:src="@drawable/ic_launcher" />

<LinearLayout

    android:layout_width="wrap_content"

    android:layout_height="100dp"

    android:orientation="vertical"

    android:layout_weight="1"

    >

    <TextView

        android:id="@+id/tv1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="TextView" />

    

    

</LinearLayout>

</LinearLayout>

3.bean包类

package com.example.vo;

import java.util.List;

public class Musics {

    public List<Music> music;

    public class Music {

        public String authorName;

        public String des;

        public String musicName;

        public String path;

    }

}

4.EntWorkUtils类

package com.example.utils;

import java.io.InputStream;

import android.content.Context;

public class EntWorkUtils {

    

    public static String getString(Context context){

        

        try {

            InputStream is = context.getAssets().open("musicdata.json");

            StringBuilder builder=new StringBuilder();

            int len;

            byte[] arr=new byte[1024];

            while((len=is.read(arr))!=-1){

                builder.append(new String(arr, 0, len));

            }

            return builder.toString();

            

            

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        return null;

        

    }

}

5.MyAdapter类

package com.example.adapter;

import java.util.ArrayList;

import java.util.List;

import com.example.vo.Musics.Music;

import com.example.yuekao04.R;

import android.content.Context;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.ImageView;

import android.widget.TextView;

public class MyAdapter extends BaseAdapter {

    List<Music> list=new ArrayList<Music>();

    Context context;

    public MyAdapter(Context context) {

        this.context=context;

    }

    public void addrest(List<Music> list){

        this.list.clear();

        this.list.addAll(list);

        this.notifyDataSetChanged();

    }

    @Override

    public int getCount() {

        // TODO Auto-generated method stub

        return list.size();

    }

    @Override

    public Object getItem(int position) {

        // TODO Auto-generated method stub

        return null;

    }

    @Override

    public long getItemId(int position) {

        // TODO Auto-generated method stub

        return 0;

    }

    @Override

    public View getView(int position, View convertView, ViewGroup parent) {

         ViewHolder holder = null;

            if (convertView == null) {

                holder = new ViewHolder();

                convertView = View.inflate(context, R.layout.lv_item, null);

                holder.iv1 = (ImageView) convertView

                        .findViewById(R.id.iv1);

      
acd9
          holder.tv1 = (TextView) convertView.findViewById(R.id.tv1);

                holder.tv2 = (TextView) convertView.findViewById(R.id.tv2);

                holder.tv3 = (TextView) convertView.findViewById(R.id.tv3);

                holder.tv4 = (TextView) convertView.findViewById(R.id.tv4);

                convertView.setTag(holder);

            } else {

                holder = (ViewHolder) convertView.getTag();

            }

            holder.tv1.setText(list.get(position).authorName);

            holder.tv2.setText(list.get(position).des);

            holder.tv3.setText(list.get(position).musicName);

            holder.tv4.setText(list.get(position).path);

            

            return convertView;

    }

    class ViewHolder{

        

        ImageView iv1;

        TextView tv1,tv2,tv3,tv4;

    }

}

6.MainActivity类

package com.example.yuekao04;

import java.util.List;

import com.example.adapter.MyAdapter;

import com.example.adapter.pull_grid.PullToRefreshLayout;

import com.example.adapter.pull_grid.PullToRefreshLayout.OnRefreshListener;

import com.example.adapter.pull_grid.PullableGridView;

import com.example.utils.EntWorkUtils;

import com.example.vo.Musics;

import com.example.vo.Musics.Music;

import com.google.gson.Gson;

import android.os.Bundle;

import android.os.Handler;

import android.app.Activity;

import android.view.Menu;

import android.widget.ListView;

public class MainActivity extends Activity implements OnRefreshListener {

    private PullableGridView lv;

    private List<Music> list;

    private MyAdapter adapter;

    private PullToRefreshLayout refresh_view;

    private Handler mHandler = new Handler();

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        //下拉刷新上拉加载

        refresh_view = (PullToRefreshLayout) findViewById(R.id.refresh_view);

        lv = (PullableGridView)findViewById(R.id.gv);

        refresh_view.setOnRefreshListener(this);

      //解析

        jsonData();

        //适配器

        get();

    }

    private void get() {

        // TODO Auto-generated method stub

        adapter=new MyAdapter(this);

        lv.setAdapter(adapter);

        adapter.addrest(list);

    }

//解析

    private void jsonData() {

        String json = EntWorkUtils.getString(this);

        

        Gson gson=new Gson();

        Musics json2 = gson.fromJson(json, Musics.class);

        //new TypeToken<List<Aa>>(){}.getType()

         list = json2.music;

        

    }

    // 上拉刷新

    @Override

    public void onRefresh(final PullToRefreshLayout pullToRefreshLayout) {                

        mHandler.postDelayed(new Runnable() {

            @Override

            public void run() {

                get();

                pullToRefreshLayout.refreshFinish(PullToRefreshLayout.SUCCEED);

            }

        }, 1000);

    }

    // 下拉加载

    @Override

    public void onLoadMore(final PullToRefreshLayout pullToRefreshLayout) {

        mHandler.postDelayed(new Runnable() {

            @Override

            public void run() {

                get();

                pullToRefreshLayout.refreshFinish(PullToRefreshLayout.SUCCEED);

            }

        }, 1000);

    }

    

}