Android の Alchemy API に関連する URL から json 値を取得しようとしています。ブラウザでの json の回答は次のとおりです。
{
"status": "OK",
"usage": "By accessing AlchemyAPI or using information generated by AlchemyAPI, you are agreeing to be bound by the AlchemyAPI Terms of Use: http://www.alchemyapi.com/company/terms.html",
"url": "",
"language": "english",
"docSentiment": {
"type": "negative",
"score": "-0.423469"
}
}
アンドロイドの私のコードは次のとおりです。
package com.example.daymanger;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.BufferedHttpEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONObject;
import android.app.Activity;
import android.os.Bundle;
import android.os.StrictMode;
import android.widget.TextView;
import android.widget.Toast;
public class Alchemy extends Activity {
StringBuilder total;
HttpClient httpclient;
HttpPost httppost;
JSONArray arr;
ArrayList<NameValuePair> nameValuePairs;
HttpResponse response;
String thelangage;
HttpEntity entity;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.alchemy);
TextView al=(TextView)findViewById(R.id.alchemy_text);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
try
{
httpclient = new DefaultHttpClient();
httppost = new HttpPost("myurl");
try{
nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("type",thelangage));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
response = httpclient.execute(httppost);
if(response.getStatusLine().getStatusCode()==200)
{
entity=response.getEntity();
if(entity !=null)
{
InputStream instream=entity.getContent();
try {
JSONObject jsonResponse = new JSONObject(convertStreamToString(instream));
JSONArray ja = jsonResponse.getJSONArray("docSentiment");
JSONObject json_data = ja.getJSONObject(0);
String mylang=json_data.getString("type");
}
catch(Exception e)
{
Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_LONG).show();
}
}
}
}
catch(Exception ex)
{
Toast.makeText(getBaseContext(), ex.toString(),Toast.LENGTH_LONG).show();
}
}catch(Exception e)
{
Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_LONG).show();
}
}
private static String convertStreamToString(InputStream is)
{
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try
{
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
}catch(IOException e)
{
}
finally
{
try{
is.close();
}catch(IOException e)
{
}
}return sb.toString();
}
}
ポイントは、「docsentiment」の「type」の値を取得したいのですが、機能していません。誰か助けてください