ANDROID笔记：JSON和Adapter的使用

 1 package com.example.android_json;
 2 
 3 import java.io.BufferedReader;
 4 import java.io.IOException;
 5 import java.io.InputStream;
 6 import java.io.InputStreamReader;
 7 import java.io.UnsupportedEncodingException;
 8 
 9 import org.json.JSONArray;
10 import org.json.JSONException;
11 
12 import android.app.Activity;
13 import android.os.Bundle;
14 import android.widget.ListView;
15 
16 public class MainActivity extends Activity {
17 
18     @Override
19     protected void onCreate(Bundle savedInstanceState) {
20         super.onCreate(savedInstanceState);
21         setContentView(R.layout.activity_main);
22         ListView listView = (ListView) findViewById(R.id.listview);
23         
24         InputStream inputStream = getResources().openRawResource(R.raw.person);
25         BufferedReader bufferedReader;
26         JSONArray jsonArray = null;
27         try {
28             bufferedReader = new BufferedReader(new InputStreamReader(
29                     inputStream));
30             StringBuffer stringBuffer = new StringBuffer();
31             String line;
32             while ((line = bufferedReader.readLine()) != null) {
33                 stringBuffer.append(line);
34             }
35             // 实列化JSONArray对象
36             jsonArray = new JSONArray(stringBuffer.toString());
37 
38         } catch (UnsupportedEncodingException e1) {
39             e1.printStackTrace();
40         } catch (IOException e) {
41 
42             e.printStackTrace();
43         } catch (JSONException e) {
44             e.printStackTrace();
45         }
46         listView.setAdapter(new ListViewAdapter(getApplicationContext(),
47                 jsonArray));
48     }
49 
50 }

 1 package com.example.android_json;
 2 
 3 import org.json.JSONArray;
 4 import org.json.JSONException;
 5 import org.json.JSONObject;
 6 
 7 import android.content.Context;
 8 import android.view.LayoutInflater;
 9 import android.view.View;
10 import android.view.ViewGroup;
11 import android.widget.BaseAdapter;
12 import android.widget.TextView;
13 
14 public class ListViewAdapter extends BaseAdapter {
15     LayoutInflater inflater;
16     JSONArray jsonArray;
17 
18     public ListViewAdapter(Context context, JSONArray jsonArray) {
19         this.jsonArray = jsonArray;
20         inflater = LayoutInflater.from(context);
21     }
22 
23     @Override
24     public int getCount() {
25         return jsonArray.length();
26     }
27 
28     @Override
29     public Object getItem(int position) {
30         try {
31             return jsonArray.get(position);
32         } catch (JSONException e) {
33             e.printStackTrace();
34         }
35         return null;
36     }
37 
38     @Override
39     public long getItemId(int position) {
40         return position;
41     }
42 
43     @Override
44     public View getView(int position, View convertView, ViewGroup parent) {
45         View v = inflater.inflate(R.layout.listview_item, null);
46         TextView idTextView = (TextView) v.findViewById(R.id.item_id);
47         TextView nameTextView = (TextView) v.findViewById(R.id.item_name);
48         TextView sexTextView = (TextView) v.findViewById(R.id.item_sex);
49 
50         try {
51             // 得到JSONObject
52             JSONObject jsonObject = jsonArray.getJSONObject(position);
53             // 得到映射的数据
54             int id = jsonObject.getInt("id");
55             String name = jsonObject.getString("name");
56             String sex = jsonObject.getString("sex");
57             // 赋值
58             idTextView.setText(id + "");
59             nameTextView.setText(name);
60             sexTextView.setText(sex);
61         } catch (JSONException e) {
62             e.printStackTrace();
63         }
64         return v;
65     }
66 
67 }

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