This is an example of JSON parsing on Android with Gson.Google Gson is a Java library that can be used to convert Java Objects into their JSON representation.

In order to parse JSON with Gson, follow these steps:

• Create a class that extendsActivity (here called JsonParsingActivity)
• Create an instance of theGson class
• Use theDefaultHttpClient to retrieve the data if this is a web resource
• Create a class that will represent the model of the input (here called SearchResponse)
• Use thefromJson method in order to parse the JSON input and return the model object

These are demonstrated in the code snippet(s) below:

package com.javacodegeeks.android.json;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.Reader;import java.util.List;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.HttpStatus;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.widget.Toast;import com.google.gson.Gson;import com.javacodegeeks.android.json.model.Result;import com.javacodegeeks.android.json.model.SearchResponse;public class JsonParsingActivity extends Activity {    String url = "http://search.twitter.com/search.json?q=javacodegeeks";    @Override    public void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.main);  InputStream source = retrieveStream(url);  Gson gson = new Gson();  Reader reader = new InputStreamReader(source);  SearchResponse response = gson.fromJson(reader, SearchResponse.class);  Toast.makeText(this, response.query, Toast.LENGTH_SHORT).show();  List<Result> results = response.results;  for (Result result : results) {Toast.makeText(this, result.fromUser, Toast.LENGTH_SHORT).show();  }    }    private InputStream retrieveStream(String url) {  DefaultHttpClient client = new DefaultHttpClient();   HttpGet getRequest = new HttpGet(url);  try {     HttpResponse getResponse = client.execute(getRequest);     final int statusCode = getResponse.getStatusLine().getStatusCode();     if (statusCode != HttpStatus.SC_OK) {   Log.w(getClass().getSimpleName(), "Error " + statusCode + " for URL " + url);   return null;     }     HttpEntity getResponseEntity = getResponse.getEntity();     return getResponseEntity.getContent();  }   catch (IOException e) {     getRequest.abort();     Log.w(getClass().getSimpleName(), "Error for URL " + url, e);  }  return null;     }}

package com.javacodegeeks.android.json.model;import java.util.List;import com.google.gson.annotations.SerializedName;public class SearchResponse {    public List results;    @SerializedName("max_id")    public long maxId;    @SerializedName("since_id")    public int sinceId;    @SerializedName("refresh_url")    public String refreshUrl;    @SerializedName("next_page")    public String nextPage;    @SerializedName("results_per_page")    public int resultsPerPage;    public int page;    @SerializedName("completed_in")    public double completedIn;    @SerializedName("since_id_str")    public String sinceIdStr;    @SerializedName("max_id_str")    public String maxIdStr;    public String query;}

package com.javacodegeeks.android.json.model;import com.google.gson.annotations.SerializedName;public class Result {    @SerializedName("from_user_id_str")    public String fromUserIdStr;    @SerializedName("profile_image_url")    public String profileImageUrl;    @SerializedName("created_at")    public String createdAt;    @SerializedName("from_user")    public String fromUser;    @SerializedName("id_str")    public String idStr;    public Metadata metadata;    @SerializedName("to_user_id")    public String toUserId;    public String text;    public long id;    @SerializedName("from_user_id")    public String from_user_id;    @SerializedName("iso_language_code")    public String isoLanguageCode;    @SerializedName("to_user_id_str")    public String toUserIdStr;    public String source;}

package com.javacodegeeks.android.json.model;import com.google.gson.annotations.SerializedName;public class Metadata {    @SerializedName("result_type")    public String resultType;}

 
This was an example of how to parse JSON with Gson on Android.

Related Article:

• Android JSON Parsing with Gson Tutorial

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