Android：JSON表示クライアントアプリ

こないだGoogle App Engine + slim3 + JSONICで作ったサンプルをAndroidで表示するアプリを作ってみたのでメモ。

とりあえず実現したい事は、JSONをHTTPのgetで受け取ってListViewで表示までを目標に。
で、下記のように実装。
（URIベタ書きですが...、とりあえず動かしたいので。）

view plainprint?

1. import java.io.IOException;  
2. import java.util.ArrayList;  
3. import java.util.List;  
4. import org.apache.http.HttpEntity;  
5. import org.apache.http.HttpResponse;  
6. import org.apache.http.HttpStatus;  
7. import org.apache.http.ParseException;  
8. import org.apache.http.client.ClientProtocolException;  
9. import org.apache.http.client.methods.HttpGet;  
10. import org.apache.http.impl.client.DefaultHttpClient;  
11. import org.apache.http.params.HttpConnectionParams;  
12. import org.apache.http.params.HttpParams;  
13. import org.apache.http.util.EntityUtils;  
14. import org.json.JSONArray;  
15. import org.json.JSONException;  
16. import org.json.JSONObject;  
17. import android.app.Activity;  
18. import android.os.Bundle;  
19. import android.widget.ArrayAdapter;  
20. import android.widget.ListView;  
21.   
22. public class JsonListActivity extends Activity {  
23.   
24.  private String strUri = "http://1.latest.slim3demo001.appspot.com/AjaxTweet.json";  
25.   
26.  private String json = null;  
27.   
28.     /** Called when the activity is first created. */  
29.     @Override  
30.     public void onCreate(Bundle savedInstanceState) {  
31.         super.onCreate(savedInstanceState);  
32.         setContentView(R.layout.main);  
33.   
34.         DefaultHttpClient httpClient = new DefaultHttpClient();  
35.         HttpParams params = httpClient.getParams();  
36.         HttpConnectionParams.setConnectionTimeout(params, 1000);  
37.         HttpConnectionParams.setSoTimeout(params, 1000);  
38.         HttpGet httpRequest = new HttpGet(strUri);  
39.         HttpResponse httpResponse = null;  
40.   
41.         try {  
42.    httpResponse = httpClient.execute(httpRequest);  
43.   } catch (ClientProtocolException e) {  
44.    e.printStackTrace();  
45.   } catch (IOException e) {  
46.    e.printStackTrace();  
47.   }  
48.   if (httpResponse != null && httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {  
49.    HttpEntity httpEntity = httpResponse.getEntity();  
50.   
51.    try {  
52.     json = EntityUtils.toString(httpEntity);  
53.    } catch (ParseException e) {  
54.     e.printStackTrace();  
55.    } catch (IOException e) {  
56.     e.printStackTrace();  
57.    } finally {  
58.     try {  
59.      httpEntity.consumeContent();  
60.     } catch (IOException e) {  
61.      e.printStackTrace();  
62.     }  
63.    }  
64.   }  
65.   
66.   httpClient.getConnectionManager().shutdown();  
67.   ArrayAdapter<string> adapter = new ArrayAdapter<string>(this, android.R.layout.simple_list_item_1);  
68.   
69.   try {  
70.    JSONArray jsonArray = new JSONArray(json);  
71.    int cnt = jsonArray.length();  
72.    List<jsonobject> jlist = new ArrayList<jsonobject>();  
73.    for (int i = 0; i < cnt; i++) {  
74.     jlist.add(jsonArray.getJSONObject(i));  
75.    }  
76.    for (JSONObject obj : jlist) {  
77.     String item = obj.getString("content");  
78.     adapter.add(item);  
79.    }  
80.   } catch (JSONException e) {  
81.    e.printStackTrace();  
82.   }  
83.   ListView listView = (ListView)findViewById(R.id.jsonlistview);  
84.   listView.setAdapter(adapter);  
85.     }  
86. }  
87. </jsonobject></jsonobject></string></string>  

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class JsonListActivity extends Activity {

 private String strUri = "http://1.latest.slim3demo001.appspot.com/AjaxTweet.json";

 private String json = null;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpParams params = httpClient.getParams();
        HttpConnectionParams.setConnectionTimeout(params, 1000);
        HttpConnectionParams.setSoTimeout(params, 1000);
        HttpGet httpRequest = new HttpGet(strUri);
        HttpResponse httpResponse = null;

        try {
   httpResponse = httpClient.execute(httpRequest);
  } catch (ClientProtocolException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
  if (httpResponse != null && httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
   HttpEntity httpEntity = httpResponse.getEntity();

   try {
    json = EntityUtils.toString(httpEntity);
   } catch (ParseException e) {
    e.printStackTrace();
   } catch (IOException e) {
    e.printStackTrace();
   } finally {
    try {
     httpEntity.consumeContent();
    } catch (IOException e) {
     e.printStackTrace();
    }
   }
  }

  httpClient.getConnectionManager().shutdown();
  ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1);

  try {
   JSONArray jsonArray = new JSONArray(json);
   int cnt = jsonArray.length();
   List jlist = new ArrayList();
   for (int i = 0; i < cnt; i++) {
    jlist.add(jsonArray.getJSONObject(i));
   }
   for (JSONObject obj : jlist) {
    String item = obj.getString("content");
    adapter.add(item);
   }
  } catch (JSONException e) {
   e.printStackTrace();
  }
  ListView listView = (ListView)findViewById(R.id.jsonlistview);
  listView.setAdapter(adapter);
    }
}

main.xmlは下記のように

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1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:orientation="vertical"  
4.     android:layout_width="fill_parent"  
5.     android:layout_height="fill_parent"  
6.     >  
7.     <ListView  
8.      android:id="@+id/jsonlistview"  
9.      android:layout_width="fill_parent"  
10.      android:layout_height="wrap_content"/>  
11. </LinearLayout>  

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <ListView
     android:id="@+id/jsonlistview"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"/>
</LinearLayout>

ネットにつなげるので、Manifestファイルにも"android.permission.INTERNET"を追加

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1. <uses-permission android:name="android.permission.INTERNET"/>  

<uses-permission android:name="android.permission.INTERNET"/>

一応無事に動きました。

参考サイト： Android で JSON を使おう　～ 前編～CommentsAdd Star Android で JSON を使おう　～ 後編 ～CommentsAdd Star