Query and parse Google+ JSON using Google+ API.

There is a post in The official Google Code blog, discuss about Getting started on the Google+ API. It's a exercise to query and parse Google+ JSON using Google+ API.






To use Google+ API, you have to

package com.exercise.AndroidGooglePlus;

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

import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.os.Bundle;
import android.text.Html;
import android.widget.TextView;
import android.widget.Toast;

public class AndroidGooglePlusActivity extends Activity {
 
   TextView item_kind;
   TextView item_id;
   TextView item_displayName;
   TextView item_tagline;
   TextView item_gender;
   TextView item_aboutMe;
   TextView item_url;
  
   final static String GooglePlus_url
   = "https://www.googleapis.com/plus/v1/people/108189587050871927619?key=<your own Google+ API key>";
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       item_kind = (TextView)findViewById(R.id.item_kind);
       item_id = (TextView)findViewById(R.id.item_id);
       item_displayName = (TextView)findViewById(R.id.item_displayName);
       item_tagline = (TextView)findViewById(R.id.item_tagline);
       item_gender = (TextView)findViewById(R.id.item_gender);
       item_aboutMe = (TextView)findViewById(R.id.item_aboutMe);
       item_url = (TextView)findViewById(R.id.item_url);
      
       String googlePlusResult = QueryGooglePlus();
       ParseGooglePlusJSON(googlePlusResult);
      
   }
  
   String QueryGooglePlus(){
    String qResult = null;
    
    HttpClient httpClient = new DefaultHttpClient();
       HttpGet httpGet = new HttpGet(GooglePlus_url);
      
       try {
        HttpEntity httpEntity = httpClient.execute(httpGet).getEntity();
        
        if (httpEntity != null){
         InputStream inputStream = httpEntity.getContent();
         Reader in = new InputStreamReader(inputStream);
         BufferedReader bufferedreader = new BufferedReader(in);
         StringBuilder stringBuilder = new StringBuilder();
         
         String stringReadLine = null;
 
         while ((stringReadLine = bufferedreader.readLine()) != null) {
          stringBuilder.append(stringReadLine + "\n"); 
         }
         
         qResult = stringBuilder.toString(); 
        } 
       } catch (ClientProtocolException e) {
        e.printStackTrace(); 
        Toast.makeText(AndroidGooglePlusActivity.this,
          e.toString(),
          Toast.LENGTH_LONG).show();
       } catch (IOException e) {
        e.printStackTrace();
        Toast.makeText(AndroidGooglePlusActivity.this,
          e.toString(),
          Toast.LENGTH_LONG).show();
       }
    
    return qResult;
   }
  
   void ParseGooglePlusJSON(String json){
    if(json != null){
     try {
      JSONObject JsonObject = new JSONObject(json);
      item_kind.setText("kind: " + JsonObject.getString("kind"));
      item_id.setText("id: " + JsonObject.getString("id"));
            item_displayName.setText("displayName: " + JsonObject.getString("displayName"));
            item_tagline.setText("tagline: " + JsonObject.getString("tagline"));
            item_gender.setText("gender: " + JsonObject.getString("gender"));
            item_aboutMe.setText("aboutMe: " + Html.fromHtml(JsonObject.getString("aboutMe")));
            item_url.setText("url: " + JsonObject.getString("url"));
      
      Toast.makeText(AndroidGooglePlusActivity.this,
              "finished",
              Toast.LENGTH_LONG).show();
      
     } catch (JSONException e) {
      e.printStackTrace();
      Toast.makeText(AndroidGooglePlusActivity.this,
              e.toString(),
              Toast.LENGTH_LONG).show();
     }
    }
    
   }
}

<?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"
   >
<TextView 
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="@string/hello"
   />
<TextView 
   android:id="@+id/item_kind"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
<TextView 
   android:id="@+id/item_id"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
<TextView 
   android:id="@+id/item_displayName"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
<TextView 
   android:id="@+id/item_tagline"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
<TextView 
   android:id="@+id/item_gender"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
<TextView 
   android:id="@+id/item_aboutMe"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
<TextView 
   android:id="@+id/item_url"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
</LinearLayout>

note: have to modify AndroidManifest.xml to grant permission of "android.permission.INTERNET".