How to upload the Multipart Request data on server Using Android Volley.

Creating New Project.
Open android studio and create a new project.

File => New => New Project => Configure your new project => Select the form factor yours app will run on => Add an Activity to Mobile => Customize the Activity => Finish.
First we need to add Library to our project. 
compile 'dev.dworks.libs:volleyplus:+'


Create Xml file in project.   
Open => app => res => layout - activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    tools:context="org.snowcorp.imageupload.MainActivity"
    android:orientation="vertical">


    <Button
        android:id="@+id/button_choose"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="SelectImage"
        android:textColor="#000"
        android:layout_gravity="center_horizontal"
        android:layout_margin="20dp"
        android:padding="10dp"/>

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:background="@drawable/border"
        android:layout_gravity="center_horizontal"
        android:padding="5dp"
        android:layout_margin="20dp"/>

    <Button
        android:id="@+id/button_upload"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Post"
        android:textColor="#000"
        android:layout_gravity="center_horizontal"
        android:layout_margin="20dp"/>

</LinearLayout>



Create the Java file in project.
Open app => main => src = MainActivity.java

import android.content.CursorLoader;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.Toast;

import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.error.VolleyError;
import com.android.volley.request.SimpleMultiPartRequest;

public class MainActivity extends AppCompatActivity {
    private ImageView imageView;
    private Button choseButton, uploadButton;
    private ProgressBar progressBar;
    public static String BASE_URL = "your url here";
    static final int PICK_IMAGE_REQUEST = 1;
    String filePath;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        imageView = (ImageView) findViewById(R.id.imageView);
        choseButton = (Button) findViewById(R.id.button_choose);
        uploadButton = (Button) findViewById(R.id.button_upload);

        choseButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                imageBrowse();
            }
        });

        uploadButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (filePath != null) {
                    imageUpload(filePath);
                } else {
                    Toast.makeText(getApplicationContext(), "Image not selected!", Toast.LENGTH_LONG).show();
                }

            }
        });
    }

    private void imageBrowse() {
        Intent galleryIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        // Start the Intent
        startActivityForResult(galleryIntent, PICK_IMAGE_REQUEST);
    }

    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (resultCode == RESULT_OK) {

            if(requestCode == PICK_IMAGE_REQUEST){
                Uri picUri = data.getData();
                filePath = getPath(picUri);
                Log.d("filePath", filePath);
                imageView.setImageURI(picUri);

            }
        }
    }

    private void imageUpload(final String imagePath) {

        SimpleMultiPartRequest smr = new SimpleMultiPartRequest(Request.Method.POST, BASE_URL,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        Toast.makeText(getApplicationContext(), response, Toast.LENGTH_LONG).show();
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
            }
        });

        smr.addFile("image", imagePath);
        MyApplication.getInstance().addToRequestQueue(smr);

    }

    private String getPath(Uri contentUri) {
        String[] proj = { MediaStore.Images.Media.DATA };
        CursorLoader loader = new CursorLoader(getApplicationContext(), contentUri, proj, null, null, null);
        Cursor cursor = loader.loadInBackground();
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        String result = cursor.getString(column_index);
        cursor.close();
        return result;
    }

}


Create the Java file in project.
Open app => main => src = MyApplication.java

import android.app.Application;
import android.text.TextUtils;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.Volley;

public class MyApplication extends Application {
    public static final String TAG = MyApplication.class.getSimpleName();
    private RequestQueue mRequestQueue;

    private static MyApplication mInstance;

    @Override
    public void onCreate() {
        super.onCreate();
        mInstance = this;
    }

    public static synchronized MyApplication getInstance() {
        return mInstance;
    }

    public RequestQueue getRequestQueue() {
        if (mRequestQueue == null) {
            mRequestQueue = Volley.newRequestQueue(getApplicationContext());
        }

        return mRequestQueue;
    }

    public <T> void addToRequestQueue(Request<T> req, String tag) {
        req.setTag(TextUtils.isEmpty(tag) ? TAG : tag);
        getRequestQueue().add(req);
    }

    public <T> void addToRequestQueue(Request<T> req) {
        req.setTag(TAG);
        getRequestQueue().add(req);
    }

    public void cancelPendingRequests(Object tag) {
        if (mRequestQueue != null) {
            mRequestQueue.cancelAll(tag);
        }
    }
}

Add Internet permission in your manifest.
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />