ANDROID笔记：JSON和Adapter的使用

package com.example.android_json;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

import org.json.JSONArray;
import org.json.JSONException;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ListView listView = (ListView) findViewById(R.id.listview);
        
        InputStream inputStream = getResources().openRawResource(R.raw.person);
        BufferedReader bufferedReader;
        JSONArray jsonArray = null;
        try {
            bufferedReader = new BufferedReader(new InputStreamReader(
                    inputStream));
            StringBuffer stringBuffer = new StringBuffer();
            String line;
            while ((line = bufferedReader.readLine()) != null) {
                stringBuffer.append(line);
            }
            // 实列化JSONArray对象
            jsonArray = new JSONArray(stringBuffer.toString());

        } catch (UnsupportedEncodingException e1) {
            e1.printStackTrace();
        } catch (IOException e) {

            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        }
        listView.setAdapter(new ListViewAdapter(getApplicationContext(),
                jsonArray));
    }

}

package com.example.android_json;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

public class ListViewAdapter extends BaseAdapter {
    LayoutInflater inflater;
    JSONArray jsonArray;

    public ListViewAdapter(Context context, JSONArray jsonArray) {
        this.jsonArray = jsonArray;
        inflater = LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        return jsonArray.length();
    }

    @Override
    public Object getItem(int position) {
        try {
            return jsonArray.get(position);
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View v = inflater.inflate(R.layout.listview_item, null);
        TextView idTextView = (TextView) v.findViewById(R.id.item_id);
        TextView nameTextView = (TextView) v.findViewById(R.id.item_name);
        TextView sexTextView = (TextView) v.findViewById(R.id.item_sex);

        try {
            // 得到JSONObject
            JSONObject jsonObject = jsonArray.getJSONObject(position);
            // 得到映射的数据
            int id = jsonObject.getInt("id");
            String name = jsonObject.getString("name");
            String sex = jsonObject.getString("sex");
            // 赋值
            idTextView.setText(id + "");
            nameTextView.setText(name);
            sexTextView.setText(sex);
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return v;
    }

}

[{"id":1,"name":"xiaosan","sex":"男"},{"id":2,"name":"xiaowu","sex":"女"}]