Parse.initialize(this, "yourKeyHere", "yourKeyHere");

<application
    android:name="MApplication "
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_newname"
>

HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("URL TO SERVER");

MultipartEntity mpEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
File file = new File(filePath);
mpEntity.addPart("imgField", new FileBody(file, "application/octet"));

httppost.setEntity(mpEntity);
HttpResponse response = httpclient.execute(httppost);

ParseFile imgFile = new ParseFile ("img.png", ImgByteArray);

ParseObject myParseObject = new ParseObject ("ParseClass");    
 myParseObject.put("imageField", imgFile);
 myParseObject.saveInBackground();

imageObj.saveInBackground(new SaveCallback() {
  @Override
  public void done(ParseException e) {
    if (e == null) {
      //Successful
    } else {
      //Error
    }
  }
});

view.findViewById(R.id.addJobOffer).setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View view) {

    ParseObject jobOffer = new ParseObject("JobOffer");

    jobOffer.put("title", "Android Contract");
    jobOffer.put("description", "6 months rolling    contract. /n The client" +
    "is a worldwide known digital agency");
    jobOffer.put("type", "Contract");
    jobOffer.put("salary", "450 GBP/day");
    jobOffer.put("company", "Recruiters LTD");
    jobOffer.put("imageLink", "http://.....recruitersLTD_logo.png");
    jobOffer.put("location","Reading, UK");

    jobOffer.saveInBackground();
  }
});

ParseQuery<ParseObject> query = ParseQuery.getQuery("JobOffer");
query.getInBackground("yourObjectID", new GetCallback<ParseObject>() {
  public void done(ParseObject object, ParseException e) {
    if (e == null) {
      // object will be our job offer
    } else {
      // something went wrong
    }
  }
});

if (e == null) {
  Log.d("PARSE_TEST",object.getString("Title"));
} else {
  // something went wrong
}

JobOffer myJobOffer = new JobOffer(object.getString("title), object.getString("description"), … );

public void done(JobOffer jobOffer, ParseException e) 

public class MAApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();

        // Enable Local Datastore.
        Parse.enableLocalDatastore(this);

        ParseObject.registerSubclass(JobOffer.class);

        Parse.initialize(this, "KEY", "KEY");
    }

}

@ParseClassName("JobOffer")
public class JobOffer extends ParseObject {

    public JobOffer() {
        // A default constructor is required.
    }

    public String getTitle() {
        return getString("title");
    }

    public void setTitle(String title) {
        put("title", title);
    }

    public String getDescription() {
        return getString("description");
    }

    public void setDescription(String description) {
        put("description", description);
    }

    public String getType() {
        return getString("type");
    }

    public void setType(String type) {
        put("type", type);
    }
    //Continue with all the fields..

}

ParseQuery< JobOffer > query = ParseQuery.getQuery("JobOffer");
query.whereEqualTo("type", "Permanent");
query.findInBackground(new FindCallback<JobOffer>() {
    public void done(List<JobOffer> jobsList, ParseException e) {
        if (e == null) {
            Log.d("score", "Retrieved " + jobsList.size() + " jobs");
        } else {
            Log.d("score", "Error: " + e.getMessage());
        }
    }
});

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="10dp">

    <TextView
        android:id="@+id/rowJobOfferTitle"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Title"
        android:textColor="#555"
        android:textSize="18sp"
        />

    <TextView
        android:id="@+id/rowJobOfferDesc"
        android:layout_marginTop="5dp"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Description"
        android:textColor="#999"
        android:textSize="16sp"
        android:maxLines="1"
        android:ellipsize="marquee"
        />

</LinearLayout>

Object object = new Object() {

 //Override methods here

 }

ParseQueryAdapter<JobOffer> parseQueryAdapter = new ParseQueryAdapter<JobOffer>(getActivity(),"JobOffer") {

  @Override
  public View getItemView(JobOffer jobOffer, View v, ViewGroup parent) {

    if (v == null) {
      v = View.inflate(getContext(), R.layout.row_job_offer, null);
    }

    super.getItemView(jobOffer, v, parent);

    TextView titleTextView = (TextView) v.findViewById(R.id.rowJobOfferTitle);
    titleTextView.setText(jobOffer.getTitle());
    TextView descTextView = (TextView) v.findViewById(R.id.rowJobOfferDesc);
    descTextView.setText(jobOffer.getDescription());

    return v;
  }

};

// Instantiate the RequestQueue.
RequestQueue queue = Volley.newRequestQueue(this);

// If the device is running a version >= Gingerbread...
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
    // ...use HttpURLConnection for stack.
} else {
    // ...use AndroidHttpClient for stack.
}

String url ="https://www.google.com";

// Request a string response from the provided URL.
StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
            new Response.Listener<String>() {
    @Override
    public void onResponse(String response) {
        // Display the first 500 characters of the response string.
        Log.d("Volley","Response is: "+ response.substring(0,500));
    }
}, new Response.ErrorListener() {
    @Override
    public void onErrorResponse(VolleyError error) {
        Log.d("Volley","That didn't work!");
    }
});

// Add the request to the RequestQueue.
queue.add(stringRequest);

OkHttpClient client = new OkHttpClient();

String run(String url) throws IOException {

  Request request = new Request.Builder()
      .url(url)
      .build();

  Response response = client.newCall(request).execute();
  return response.body().string();

}

RequestQueue queue = Volley.newRequestQueue(this, new OkHttpStack());

/**
 * An HttpStack subclass
 * using OkHttp as transport layer.
 */
public class OkHttpStack extends HurlStack {

    private final OkUrlFactory mFactory;

    public OkHttpStack() {
        this(new OkHttpClient());
    }

    public OkHttpStack(OkHttpClient client) {
        if (client == null) {
            throw new NullPointerException("Null client.");
        }
        mFactory = new OkUrlFactory(client);
    }
}

{
  "firstName": "Antonio",
  "lastName": "Smith",
  "isDeveloper": true,
  "age": 25,
  "phoneNumbers": [
    {
      "type": "home",
      "number": "212 555-1234"
    },
    {
      "type": "office",
      "number": "646 555-4567"
    }
  ],
  "children": [],
  "spouse": null
}

//With Volley

public void post(String param1, String param2, String url) {

  Map<String, String> params = new HashMap<String, String>();
  params.put("param1",param1);
  params.put("param2",param2);

  JsonObjectRequest stringRequest = new  JsonObjectRequest(Request.Method.POST, url, new JSONObject(params),  new Response.Listener<JSONObject>() {

    @Override
    public void onResponse(JSONObject responseJSON) {

    }, new Response.ErrorListener() {

      @Override
      public void onErrorResponse(VolleyError error) {
      }
    });

    // Add the request to the RequestQueue.
    requestQueue.add(stringRequest);
  }

  //With OkHttp

  public static final MediaType JSON
  = MediaType.parse("application/json; charset=utf-8");

  String post(String url, String json) throws IOException {
    RequestBody body = RequestBody.create(JSON, json);
    Request request = new Request.Builder()
    .url(url)
    .post(body)
    .build();
    Response response = client.newCall(request).execute();
    return response.body().string();

  }

  //To create a JSONObject from a string

  JSONObject responseJSON = new JSONObject(String json);

{
  "title": "Senior Android developer",
  "description": "A developer is needed for…",
  "salary": "25.000 € per year",
  .
  .
  .
}

dependencies {
compile 'com.google.code.gson:gson:2.2.4'
}

Gson gson = new Gson();
JobOffer offer = gson.fromJson(JSONString, JobOffer.class);

Gson gson = new Gson();
Type listType = new TypeToken<List<JobOffer>>(){}.getType();
List<JobOffer> listOffers = gson.fromJson(JSONString, listType);

import com.google.gson.annotations.SerializedName;

public class JobOffer extends ParseObject {

    @SerializedName("title")
    private String title;

    @SerializedName("description")
    private String desc;

    @SerializedName("salary")
    private String salary;