Query and Parse Google+ JSON

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 Apply your own Google+ API key.

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".

Download the files.

Related article:
- Example code to search Google Plus public posts