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"}]