<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ImageView
        android:layout_width="300dp"
        android:layout_height="250dp"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="15dp"
        android:id="@+id/imageView"
        android:visibility="gone"/>

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/imageView"
        android:hint="Enter a name"
        android:layout_marginTop="20dp"
        android:id="@+id/name"
        android:visibility="gone"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/name"
        android:text="Choose image"
        android:layout_marginTop="25dp"
        android:id="@+id/chooseBn"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/chooseBn"
        android:text="Upload image"
        android:id="@+id/uploadBn"/>

</RelativeLayout>

package com.mypackage.sergey.uploaddemo;

import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Base64;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private Button UploadBn, ChooseBn;
    private EditText NAME;
    private ImageView imgView;
    private final int IMG_REQUEST = 1;
    private Bitmap bitmap;
    private String UploadUrl = "http://mysite.com/image_upload_app/updateinfo.php";

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

        UploadBn = (Button) findViewById(R.id.uploadBn);
        ChooseBn = (Button) findViewById(R.id.chooseBn);
        NAME = (EditText) findViewById(R.id.name);
        imgView = (ImageView) findViewById(R.id.imageView);
        ChooseBn.setOnClickListener(this);
        UploadBn.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.chooseBn:
                selectImage();
                break;
            case R.id.uploadBn:
                uploadImage();
                break;
        }
    }

    private void selectImage() {
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(intent, IMG_REQUEST);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == IMG_REQUEST && resultCode == RESULT_OK && data != null) {
            Uri path = data.getData();
            try {
                bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), path);
                imgView.setImageBitmap(bitmap);
                imgView.setVisibility(View.VISIBLE);
                NAME.setVisibility(View.VISIBLE);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    private void uploadImage() {
        StringRequest stringRequest = new StringRequest(Request.Method.POST, UploadUrl,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        try {
                            JSONObject jsonObject = new JSONObject(response);
                            String Response = jsonObject.getString("response");
                            Toast.makeText(MainActivity.this, Response, Toast.LENGTH_LONG).show();
                            imgView.setImageResource(0);
                            imgView.setVisibility(View.GONE);
                            NAME.setText("");
                            NAME.setVisibility(View.GONE);
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {

            }
        })

        {
            @Override
            protected Map<String, String> getParams() throws AuthFailureError {
                Map<String, String> params = new HashMap<>();
                params.put("name", NAME.getText().toString().trim());
                params.put("image", imageToString(bitmap));

                return params;
            }
        };
        MySingleton.getInstanse(MainActivity.this).addToRequestQueue(stringRequest);
    }

    private String imageToString(Bitmap bitmap) {
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, byteArrayOutputStream);
        byte[] imgBytes = byteArrayOutputStream.toByteArray();

        return Base64.encodeToString(imgBytes, Base64.DEFAULT);
    }
}

package com.mypackage.sergey.uploaddemo;

import android.content.Context;

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

public class MySingleton {
    private static MySingleton mInstanse;
    private RequestQueue requestQueue;
    private static Context mCtx;

    private MySingleton(Context context) {
        mCtx = context;
        requestQueue = getRequestQueue();
    }

    private RequestQueue getRequestQueue() {
        if (requestQueue == null) {
            requestQueue = Volley.newRequestQueue(mCtx.getApplicationContext());
        }
        return requestQueue;
    }

    public static synchronized MySingleton getInstanse(Context context) {
        if (mInstanse == null) {
            mInstanse = new MySingleton(context);
        }
        return mInstanse;
    }

    public<T> void addToRequestQueue(Request<T> request) {
        getRequestQueue().add(request);
    }
}

<?php

header('Content-type: bitmap; charset=utf-8');

$user_name = "user_name";
$user_pass = "user_pass";
$host_name = "host_name";
$db_name = "db_name";

$con = mysqli_connect($host_name, $user_name, $user_pass, $db_name);

if ($con) {
    $image = $_POST['image'];
    $name = $_POST['name'];
    $sql = "INSERT INTO imageinfo (name) values('$name')";
    $upload_path = "uploads/$name.jpg";

    if (mysqli_query($con, $sql)) {
        file_put_contents($upload_path, base64_decode($image));
        echo json_encode(array('response' => 'Image Uploaded Successfully'));
    } else {
        echo json_encode(array('response' => 'Image upload failed'));
    }
} else {
    echo json_encode(array('response' => 'Image Uplode Failed'));
}
mysqli_close($con);
?>

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "com.mypackage.sergey.uploaddemo"
        minSdkVersion 17
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
    compile 'com.android.volley:volley:1.0.0'
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mypackage.sergey.uploaddemo">
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>