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MainActivity[MainActivity.class]

package com.androidfeeders.imageuploadinandroid;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.util.Base64;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.Toast;

import com.android.volley.AuthFailureError;
import com.android.volley.Cache;
import com.android.volley.Network;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.BasicNetwork;
import com.android.volley.toolbox.DiskBasedCache;
import com.android.volley.toolbox.HurlStack;
import com.android.volley.toolbox.StringRequest;

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

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


/**
 * Created by Android feeders on 11/7/2018.
 */


public class MainActivity extends AppCompatActivity {

    private int REQUEST_CAMERA = 0, SELECT_FILE = 1;
    private Button btnSelect;
    private ImageView imageView;
    private String userChoosenImage;
    Bitmap thumbnail;

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

        imageView = (ImageView) findViewById(R.id.ivImage);
        btnSelect = (Button) findViewById(R.id.btnSelectPhoto);
        btnSelect.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                selectImage();
            }
        });

        linearLayoutProgress = (LinearLayout) findViewById(R.id.linearLayoutProgress);
        progressBar = (ProgressBar) findViewById(R.id.progressBar);

    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        switch (requestCode) {
            case Utility.MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    if(userChoosenImage.equals("Camera"))
                        cameraIntent();
                    else if(userChoosenImage.equals("Choose from Gallery"))
                        galleryIntent();
                } else {
                    //code for deny
                }
                break;
        }
    }

    private void selectImage() {
        final CharSequence[] items = { "Camera", "Choose from Gallery",
                "Cancel" };

        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        builder.setTitle("Pick Photo From");

        builder.setItems(items, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int item) {
                boolean result=Utility.checkPermission(MainActivity.this);

                if (items[item].equals("Camera")) {
                    userChoosenImage ="Camera";
                    if(result)
                        cameraIntent();

                } else if (items[item].equals("Choose from Gallery")) {
                    userChoosenImage ="Choose from Gallery";
                    if(result)
                        galleryIntent();

                } else if (items[item].equals("Cancel")) {
                    dialog.dismiss();
                }
            }
        });
        builder.show();
    }

    private void cameraIntent()
    {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(intent, REQUEST_CAMERA);
    }
    private void galleryIntent()
    {
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);//
        startActivityForResult(Intent.createChooser(intent, "Select File"),SELECT_FILE);
    }
    //camera methods.....
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (resultCode == Activity.RESULT_OK) {
            if (requestCode == SELECT_FILE)
                onSelectFromGalleryResult(data);
            else if (requestCode == REQUEST_CAMERA)
                onCaptureImageResult(data);
        }
    }

    private void onCaptureImageResult(Intent data) {

        thumbnail = (Bitmap) data.getExtras().get("data");

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        thumbnail.compress(Bitmap.CompressFormat.JPEG, 100, baos);
        byte[] imageBytes = baos.toByteArray();
        String imageString = Base64.encodeToString(imageBytes, Base64.DEFAULT);
        imageUpload(imageString);
    }


    //Picking Gallery Image
    private void onSelectFromGalleryResult(Intent data) {

        thumbnail=null;
        if (data != null) {
            try {
                thumbnail = MediaStore.Images.Media.getBitmap(getApplicationContext().getContentResolver(), data.getData());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        thumbnail.compress(Bitmap.CompressFormat.JPEG, 100, baos);
        byte[] imageBytes = baos.toByteArray();
        String imageString = Base64.encodeToString(imageBytes, Base64.DEFAULT);
        imageUpload(imageString);
    }


    public void  imageUpload(final String imageString)
    {


        String server_url = "https://www.androidfeeders.com/uploadImages.php";
        Cache cache = new DiskBasedCache(getCacheDir(),1024*1024);
        Network network = new BasicNetwork(new HurlStack());
        linearLayoutProgress.setVisibility(View.VISIBLE);

        final RequestQueue requestQueue = new RequestQueue(cache,network);
        requestQueue.start();


        StringRequest stringReq = new StringRequest(Request.Method.POST, server_url,
                new Response.Listener() {
                    @Override
                    public void onResponse(String response) {
                        Log.i("Response", response);
                        try {
                            JSONObject jsonObject= new JSONObject(response);
                            String responseStatus= jsonObject.getString("response");
                            Toast.makeText(MainActivity.this,responseStatus, Toast.LENGTH_SHORT).show();
                            linearLayoutProgress.setVisibility(View.GONE);

                        } catch (JSONException e) {
                            e.printStackTrace();
                        }

                        requestQueue.stop();
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {

                Toast.makeText(MainActivity.this, "Something goes wrong ..Try Later", Toast.LENGTH_SHORT).show();
                requestQueue.stop();
                linearLayoutProgress.setVisibility(View.GONE);

            }
        }){
            @Override
            protected Map getParams() throws AuthFailureError {
                Map params = new HashMap();
                {
                    Log.i("image",imageString);
                    params.put("name", String.valueOf(System.currentTimeMillis()));
                    params.put("image",imageString);

                    return params;
                }
            }
        };

        Singleton.getInstance(this).addToRequestque(stringReq);

        imageView.setImageBitmap(thumbnail);

    }

}

Singleton[Singleton.class]

package com.androidfeeders.imageuploadinandroid;

import android.content.Context;

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



/**
 * Created by Android feeders on 11/7/2018.
 */


public class Singleton {


    private static Singleton singleton;
    private RequestQueue requestQueue;
    private static Context context;

    public Singleton(Context ctx)
    {
        context = ctx;
        requestQueue = getRequestQueue();
    }

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

    public static synchronized Singleton getInstance(Context context)
    {
        if(singleton == null)
        {
            singleton = new Singleton(context);
        }
        return singleton;
    }

    public void addToRequestque(Request request)
    {
        requestQueue.add(request);
    }


}

Utility [Utility Class in android]

package com.androidfeeders.imageuploadinandroid;

import android.Manifest;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.os.Build;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AlertDialog;


/**
 * Created by Android feeders on 11/7/2018.
 */



public class Utility {
    public static final int MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE = 100;

    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
    public static boolean checkPermission(final Context context)
    {
        int currentAPIVersion = Build.VERSION.SDK_INT;
        if(currentAPIVersion>= Build.VERSION_CODES.M)
        {
            if (ContextCompat.checkSelfPermission(context, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                if (ActivityCompat.shouldShowRequestPermissionRationale((Activity) context, Manifest.permission.READ_EXTERNAL_STORAGE)) {
                    AlertDialog.Builder alertBuilder = new AlertDialog.Builder(context);
                    alertBuilder.setCancelable(true);
                    alertBuilder.setTitle("Permission necessary");
                    alertBuilder.setMessage("External storage permission is necessary");
                    alertBuilder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
                        @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
                        public void onClick(DialogInterface dialog, int which) {
                            ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);
                        }
                    });
                    AlertDialog alert = alertBuilder.create();
                    alert.show();

                } else {
                    ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);
                }
                return false;
            } else {
                return true;
            }
        } else {
            return true;
        }
    }
}

Layout Resource[activity_main.xml]

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="10dp" >


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="vertical"
        android:padding="10dp" >

        <ImageView
            android:id="@+id/ivImage"
            android:layout_width="200dp"
            android:layout_height="200dp"
            android:src="@mipmap/ic_launcher" />
    </LinearLayout>


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:padding="5dp" >

        <Button
            android:id="@+id/btnSelectPhoto"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Pick Image" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/linearLayoutProgress"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="vertical"
        android:visibility="gone" >

        <ProgressBar
            android:id="@+id/progressBar"
            style="@style/AppTheme"
            android:indeterminate="true"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >
        </ProgressBar>
    </LinearLayout>

</LinearLayout>

Gradle Scripts~build.gradle[Module:app]

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.androidfeeders.imageuploadinandroid"
        minSdkVersion 15
        targetSdkVersion 28
        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-v7:28.0.0-alpha3'
    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.android.volley:volley:1.0.0'
}

Gradle Scripts~build.gradle[Project:ImageUploadInAndroid]

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.1'
        

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

Resource[strings.xml]
<resources>
    <string name="app_name">ImageUploadInAndroid</string>
</resources>

manifests

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.androidfeeders.imageuploadinandroid">


    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WRITE_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>