Android cropping image from camera or gallery.

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 'de.hdodenhof:circleimageview:2.1.0'
compile 'com.soundcloud.android:android-crop:1.0.1@aar'
compile 'com.jakewharton:butterknife:8.4.0'


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

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">

    <de.hdodenhof.circleimageview.CircleImageView
        android:id="@+id/preImage"
        android:layout_width="144dp"
        android:layout_height="144dp"
        android:layout_centerInParent="true"
        android:layout_gravity="center"
        android:src="@mipmap/ic_launcher"
        app:civ_border_color="#ffffff"
        app:civ_border_width="2dp"></de.hdodenhof.circleimageview.CircleImageView>

</RelativeLayout>


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

import android.app.ProgressDialog;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
import com.soundcloud.android.crop.Crop;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import de.hdodenhof.circleimageview.CircleImageView;
import static journal.shibboleth.com.croperactivity.MarshMallowPermission.CAMERA_PERMISSION_REQUEST_CODE;
import static journal.shibboleth.com.croperactivity.MarshMallowPermission.EXTERNAL_STORAGE_PERMISSION_REQUEST_CODE;

public class MainActivity extends AppCompatActivity {

    private static final int CAMERA_REQUEST = 108;
    private String mCurrentPhotoPath = "";

    private MarshMallowPermission marshMallowPermission;
    private int mAddedItems = 0;
    private ProgressDialog mProgressDialog;

    private boolean isUpdated = false;

    CircleImageView mPreImageView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mPreImageView = (de.hdodenhof.circleimageview.CircleImageView) findViewById(R.id.preImage);

        mPreImageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (CheckVersions.isMarshmallow()) {
                    marshMallowPermission =
                            new MarshMallowPermission(MainActivity.this);
                    if (!marshMallowPermission.checkPermissionForCamera()) {
                        marshMallowPermission.requestPermissionForCamera();
                    } else {
                        if (!marshMallowPermission.checkPermissionForExternalStorage()) {
                            marshMallowPermission.requestPermissionForExternalStorage();
                        } else {
                            clickImage();
                        }
                    }
                } else {
                    clickImage();
                }
            }
        });


    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == android.R.id.home) {
            Intent returnIntent = new Intent();
            setResult(RESULT_CANCELED, returnIntent);
            finish();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }


    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults) {
        switch (requestCode) {
            case CAMERA_PERMISSION_REQUEST_CODE:
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    if (!marshMallowPermission.checkPermissionForExternalStorage()) {
                        marshMallowPermission.requestPermissionForExternalStorage();
                    } else {
                        clickImage();
                    }
                    // permission was granted, yay! Do the
                    // contacts-related task you need to do.

                } else {
                    Toast.makeText(this, "Camera permission needed." +
                            " Please allow in App Settings for additional " +
                            "functionality.", Toast.LENGTH_LONG).show();
                    // permission denied, boo! Disable the
                    // functionality that depends on this permission.
                }
            case EXTERNAL_STORAGE_PERMISSION_REQUEST_CODE: {
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    clickImage();
                    // permission was granted, yay! Do the
                    // contacts-related task you need to do.

                } else {
                    Toast.makeText(this, "External Storage permission needed. " +
                            "Please allow in App Settings for additional" +
                            " functionality.", Toast.LENGTH_LONG).show();
                    // permission denied, boo! Disable the
                    // functionality that depends on this permission.
                }

            }

            // other 'case' lines to check for other
            // permissions this app might request
        }
    }


    private void clickImage() {
        final CharSequence[] items = {"Take Photo Camera", "Take Photo Gallery"};
        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        builder.setTitle("Add Photo!");
        builder.setItems(items, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int item) {
                if (items[item].equals("Take Photo Camera")) {
                    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    if (cameraIntent.resolveActivity(getPackageManager()) != null) {
                        // Create the File where the photo should go
                        File photoFile;
                        photoFile = createImageFile();
                        // Continue only if the File was successfully created
                        if (photoFile != null) {
                            cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
                            startActivityForResult(cameraIntent, CAMERA_REQUEST);
                        } else {
                            mCurrentPhotoPath = "";
                            startActivityForResult(cameraIntent, CAMERA_REQUEST);
                        }

                    }
                } else if (items[item].equals("Take Photo Gallery")) {
                    Crop.pickImage(MainActivity.this);
                }
            }
        });
        builder.show();
    }

    private File createImageFile() {
        // Create an image file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US).format(new Date());
        String imageFileName = "JPEG_" + timeStamp + "_";
        File storageDir = Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_PICTURES);
        File image = null;
        try {
            image = File.createTempFile(
                    imageFileName,  // prefix
                    ".jpg",         // suffix
                    storageDir      // directory

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

        // Save a file: path for use with ACTION_VIEW intents
        if (image != null) {
            mCurrentPhotoPath = "file:" + image.getAbsolutePath();
            Log.i("Ihdh", "Image" + mCurrentPhotoPath);
        }
        return image;
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent result) {
        if (resultCode != RESULT_CANCELED) {
            if (requestCode == Crop.REQUEST_PICK && resultCode == RESULT_OK) {
                beginCrop(result.getData());
            } else if (requestCode == Crop.REQUEST_CROP) {
                handleCrop(resultCode, result);
            } else if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {
                if (mCurrentPhotoPath == null || mCurrentPhotoPath.isEmpty()) {
                    beginCrop(result.getData());
                } else {
                    beginCrop(Uri.parse(mCurrentPhotoPath));
                }
            }
        }
    }

    private void beginCrop(Uri source) {
        try {
            File file = MainActivity.this.getCacheDir();
            deleteDir(file);
        } catch (Exception e) {
            e.printStackTrace();
        }

        Uri destination = Uri.fromFile(new File(getCacheDir(), "cropped"));
        Crop.of(source, destination).asSquare().start(this, Crop.REQUEST_CROP);
    }

    public static boolean deleteDir(File dir) {
        if (dir != null && dir.isDirectory()) {
            String[] children = dir.list();
            for (String aChildren : children) {
                boolean success = deleteDir(new File(dir, aChildren));
                if (!success) {
                    return false;
                }
            }
        }

        // The directory is now empty so delete it
        return dir != null && dir.delete();
    }

    private void handleCrop(int resultCode, Intent result) {
        if (resultCode == RESULT_OK) {
            try {
                mPreImageView.setImageDrawable(null);
            } catch (Exception e) {
                e.printStackTrace();
            }
            try {
                Log.i("CROP", "handleCrop: " + Crop.getOutput(result));
                mPreImageView.setImageURI(Crop.getOutput(result));
            } catch (Exception e) {
                e.printStackTrace();
            }
        } else if (resultCode == Crop.RESULT_ERROR) {
            try {
                Toast.makeText(this, Crop.getError(result).getMessage(), Toast.LENGTH_SHORT).show();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    private String saveToInternalStorage(Bitmap bitmapImage) {
        ContextWrapper cw = new ContextWrapper(getApplicationContext());
        // path to /data/data/yourapp/app_data/imageDir
        File directory = cw.getDir("imageDir", Context.MODE_PRIVATE);
        // Create imageDir
        String name = System.currentTimeMillis() + "_image.jpg";
        File mypath = new File(directory, name);

        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(mypath);
            // Use the compress method on the BitMap object to write image to the OutputStream
            bitmapImage.compress(Bitmap.CompressFormat.JPEG, 50, fos);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (fos != null) {
                    fos.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return directory.getAbsolutePath() + "/" + name;
    }

}
Android Working with Marshmallow (M) Runtime Permissions.
Create the Java file in project.
Open app => main => src = CheckVersions.java

import android.os.Build;

/**
 * Created by Laptop on 24-10-2016.
 */

public class CheckVersions {
    public static boolean isMarshmallow() {
        return Build.VERSION.SDK_INT >= Build.VERSION_CODES.M;
    }
}


Create the Java file in project.
Open app => main => src = MarshMallowPermission.java
import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.widget.Toast;

/**
 * Created by pc on 10/26/2016.
 */

public class MarshMallowPermission {
    public static final int EXTERNAL_STORAGE_PERMISSION_REQUEST_CODE = 2;
    public static final int CAMERA_PERMISSION_REQUEST_CODE = 3;
    Activity activity;

    public MarshMallowPermission(Activity activity) {
        this.activity = activity;
    }


    public boolean checkPermissionForExternalStorage() {
        int result = ContextCompat.checkSelfPermission(activity,
                Manifest.permission.WRITE_EXTERNAL_STORAGE);
        return result == PackageManager.PERMISSION_GRANTED;
    }

    public boolean checkPermissionForCamera() {
        int result = ContextCompat.checkSelfPermission(activity, Manifest.permission.CAMERA);
        return result == PackageManager.PERMISSION_GRANTED;
    }


    public void requestPermissionForExternalStorage() {
        if (ActivityCompat.shouldShowRequestPermissionRationale(activity,
                Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
            Toast.makeText(activity, "External Storage permission needed. " +
                    "Please allow in App Settings for additional" +
                    " functionality.", Toast.LENGTH_LONG).show();
        } else {
            ActivityCompat.requestPermissions(activity, new String[]{
                            Manifest.permission.WRITE_EXTERNAL_STORAGE},
                    EXTERNAL_STORAGE_PERMISSION_REQUEST_CODE);
        }
    }

    public void requestPermissionForCamera() {
        if (ActivityCompat.shouldShowRequestPermissionRationale(activity,
                Manifest.permission.CAMERA)) {
            Toast.makeText(activity, "Camera permission needed." +
                    " Please allow in App Settings for additional " +
                    "functionality.", Toast.LENGTH_LONG).show();
        } else {
            ActivityCompat.requestPermissions(activity, new String[]{
                            Manifest.permission.CAMERA},
                    CAMERA_PERMISSION_REQUEST_CODE);
        }
    }

}

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

How to share the GPS location on Whatspp in Android Studio.

Creating 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.

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

<RelativeLayout 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:background="@drawable/image"
    android:paddingBottom="64dp"
    android:paddingLeft="64dp"
    android:paddingRight="64dp"
    android:paddingTop="64dp">

    <Button
        android:id="@+id/btnShowLocation"
        android:layout_width="match_parent"
        android:layout_height="36dp"
        android:layout_centerHorizontal="true"
        android:layout_centerInParent="true"
        android:background="@drawable/btn_back"
        android:text="SEND LOCATION"
        android:textColor="@color/colorPrimary" />

</RelativeLayout>

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

import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;

public class GPSTracker extends Service implements LocationListener {

    private final Context mContext;

    // flag for GPS status
    boolean isGPSEnabled = false;

    // flag for network status
    boolean isNetworkEnabled = false;

    // flag for GPS status
    boolean canGetLocation = false;

    Location location; // location
    double latitude; // latitude
    double longitude; // longitude

    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

    // Declaring a Location Manager
    protected LocationManager locationManager;

    public GPSTracker(Context context) {
        this.mContext = context;
        getLocation();
    }

    public Location getLocation() {
        try {
            locationManager = (LocationManager) mContext
                    .getSystemService(LOCATION_SERVICE);

            // getting GPS status
            isGPSEnabled = locationManager
                    .isProviderEnabled(LocationManager.GPS_PROVIDER);

            // getting network status
            isNetworkEnabled = locationManager
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled
            } else {
                this.canGetLocation = true;
                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("Network", "Network");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }
                // if GPS Enabled get lat/long using GPS Services
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        Log.d("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) {
                            location = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            }
                        }
                    }
                }
            }

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

        return location;
    }

    /**
     * Stop using GPS listener
     * Calling this function will stop using GPS in your app
     */
    public void stopUsingGPS() {
        if (locationManager != null) {
            locationManager.removeUpdates(GPSTracker.this);
        }
    }

    /**
     * Function to get latitude
     */
    public double getLatitude() {
        if (location != null) {
            latitude = location.getLatitude();
        }

        // return latitude
        return latitude;
    }

    /**
     * Function to get longitude
     */
    public double getLongitude() {
        if (location != null) {
            longitude = location.getLongitude();
        }

        // return longitude
        return longitude;
    }

    /**
     * Function to check GPS/wifi enabled
     *
     * @return boolean
     */
    public boolean canGetLocation() {
        return this.canGetLocation;
    }

    /**
     * Function to show settings alert dialog
     * On pressing Settings button will lauch Settings Options
     */
    public void showSettingsAlert() {
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

        // Setting Dialog Title
        alertDialog.setTitle("GPS is settings");

        // Setting Dialog Message
        alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

        // On pressing Settings button
        alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                mContext.startActivity(intent);
            }
        });

        // on pressing cancel button
        alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });

        // Showing Alert Message
        alertDialog.show();
    }

    @Override
    public void onLocationChanged(Location location) {
    }

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }
}

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

import android.app.Activity;
import android.content.Intent;
import android.location.Address;
import android.location.Geocoder;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import java.io.IOException;
import java.util.List;
import java.util.Locale;

public class GPSLocationActivity extends Activity {

    Button btnShowLocation;
    // GPSTracker class
    GPSTracker gps;

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

        btnShowLocation = (Button) findViewById(R.id.btnShowLocation);

        // show location button click event
        btnShowLocation.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // create class object
                gps = new GPSTracker(GPSLocationActivity.this);

                // check if GPS enabled       
                if (gps.canGetLocation()) {

                    double latitude = gps.getLatitude();
                    double longitude = gps.getLongitude();

                    Geocoder geocoder = new Geocoder(GPSLocationActivity.this, Locale.ENGLISH);

                    try {
                        List<Address> addresses = geocoder.getFromLocation(latitude, longitude, 1);

                        if (addresses != null) {
                            Address returnedAddress = addresses.get(0);
                            StringBuilder strReturnedAddress = new StringBuilder();
                            for (int i = 0; i < returnedAddress.getMaxAddressLineIndex(); i++) {
                                strReturnedAddress.append(returnedAddress.getAddressLine(i)).append("\n");
                            }
                            final String address = strReturnedAddress.toString();
                            String message = "Latitude: " + latitude + "\n" + "Longitude: " + longitude;

                            Intent sendIntent = new Intent();
                            sendIntent.setAction(Intent.ACTION_SEND);
                            sendIntent.putExtra(Intent.EXTRA_TEXT, address);
                            sendIntent.setType("text/plain");
                            // Do not forget to add this to open whatsApp App specifically
                            sendIntent.setPackage("com.whatsapp");
                            startActivity(sendIntent);
                            finish();
                        } else {
                            Toast.makeText(GPSLocationActivity.this, "No Address returned!", Toast.LENGTH_LONG).show();
                        }
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                        Toast.makeText(GPSLocationActivity.this, "Canont get Address!", Toast.LENGTH_LONG).show();
                    }
                } else {
                    // can't get location
                    // GPS or Network is not enabled
                    // Ask user to enable GPS/network in settings
                    gps.showSettingsAlert();
                }

            }
        });
    }
}
Add Internet permission in your manifest
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />


 May this code help you. Thanks!!!!!!
 

Automatically Read income message to verify OTP, automatically fill in edit field and Redirect Android Studio.

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.

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

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

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#33cc88">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:layout_marginLeft="4dp"
            android:layout_marginRight="4dp"
            android:gravity="center"
            android:orientation="vertical">

            <TextView
                android:id="@+id/txtMobile"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Please Enter your OTP below:"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:textColor="@color/colorText"
                android:textSize="18dp" />

            <EditText
                android:id="@+id/etOtp"
                android:layout_width="146dp"
                android:layout_height="wrap_content"
                android:layout_marginTop="12dp"
                android:ems="10"
                android:inputType="number"
                android:background="#ffffff"
                android:paddingLeft="4dp" />

        </LinearLayout>

    </RelativeLayout>

</LinearLayout>
   

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

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.support.v7.app.AppCompatActivity;
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
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.StringRequest;
import com.android.volley.toolbox.Volley;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class OtpActivity extends AppCompatActivity {
    public static EditText otpEditText;
    ProgressDialog dialog;
    public static final String KEY_OTP = "";
    String URL = "";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_otp);
        //Getting the Widget Id
        Init();
      
        //Automatically reditrect the screen

         otpEditText.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

            }

            @Override
            public void afterTextChanged(Editable s) {
                Handler h = new Handler(Looper.getMainLooper());
                h.postDelayed(new Runnable() {
                    public void run() {
                        if (otpEditText.length() > 0) {
                            otpRegister();
                        }
                    }
                }, 6000);
            }
        });
    }

    private void Init() {
        otpEditText = (EditText) findViewById(R.id.etOtp);
    }

    private void otpRegister() {
        final String mOtp = otpEditText.getText().toString();
        //SHOWING THE DIALOG
        showDialog(true);
        StringRequest stringRequest = new StringRequest(Request.Method.GET, URL,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        showDialog(false);
                        Toast.makeText(OtpActivity.this, response, Toast.LENGTH_LONG).show();

                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        showDialog(false);
                        Toast.makeText(OtpActivity.this, error.toString(), Toast.LENGTH_LONG).show();
                    }
                }) {
            @Override
            protected Map<String, String> getParams() throws AuthFailureError {
                Map<String, String> map = new HashMap<String, String>();
                map.put(KEY_OTP, "");
                return map;
            }
        };
        RequestQueue requestQueue = Volley.newRequestQueue(this);
        requestQueue.add(stringRequest);
    }
    private void showDialog(boolean check) {
        if (check) {
            dialog = ProgressDialog.show(OtpActivity.this, "", "Sending.....");
            dialog.show();
        } else {
            dialog.dismiss();
        }
    }

   private void OpenScreen() {
        Intent i = new Intent(OtpActivity.this, ChooseActivtiy.class);
        startActivity(i);
    }
   //Here is fill the OTP verify code.
    public void setOtp(String otp) {

        try {
           //****Only fill here 4 digit number***//
            Pattern p = Pattern.compile("(\\d{4})");//. represents single character
            Matcher m = p.matcher(otp);
            if (m.find()) {
                String b = m.group(1);
                otpEditText.setText(b);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

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

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.SmsMessage;
import com.sell.vevsa.OtpActivity;


public class SmsReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {

        final Bundle bundle = intent.getExtras();
        try {
            if (bundle != null) {
                final Object[] pdusObj = (Object[]) bundle.get("pdus");
                for (int i = 0; i < pdusObj.length; i++) {
                    SmsMessage currentMessage = SmsMessage.createFromPdu((byte[]) pdusObj[i]);
                    String phoneNumber = currentMessage.getDisplayOriginatingAddress();
                    String senderNum = phoneNumber;
                    String message = currentMessage.getDisplayMessageBody();
                    try {
                        if (senderNum.equals("HP-VERIFY")) {
                            OtpActivity Sms = new OtpActivity();
                            Sms.setOtp(message);
                        }
                    } catch (Exception e) {
                    }
                }
            }

        } catch (Exception e) {

        }
    }
}

Add permission and receiver in your manifest.
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.RECEIVE_SMS"></uses-permission>
<uses-permission android:name="android.permission.READ_SMS" />
<uses-permission android:name="android.permission.SEND_SMS"></uses-permission>

<receiver android:name=".SmsReceiver ">
            <intent-filter>
                <action android:name="android.provider.Telephony.SMS_RECEIVED"/>
            </intent-filter>
        </receiver>
May this code help you. Thanks!!!!!!

Create Dynamic views in Andorid Studio.

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.

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

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="desktop.laptop.com.customdemo.MainActivity">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <LinearLayout
                android:id="@+id/linearPlus"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_centerInParent="true"
                android:layout_marginTop="10dp"
                android:orientation="vertical">

            </LinearLayout>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_centerInParent="true"
                android:layout_marginTop="16dp"
                android:gravity="center"
                android:orientation="vertical">

                <Button
                    android:id="@+id/btPlus"
                    android:layout_width="32dp"
                    android:layout_height="36dp"
                    android:text="+"
                    android:textColor="#000000" />
            </LinearLayout>
        </LinearLayout>
    </ScrollView>
</android.support.constraint.ConstraintLayout>

Create Add View file in project.   
Open => app => res => layout - add_view.xml.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/root"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginTop="8dp"
    android:background="#cccccc"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="18dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/txtBook"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Guide(s)"
            android:textColor="#000000" />

        <EditText
            android:id="@+id/etBook"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="68dp"
            android:ems="10"
            android:inputType="textEmailAddress"
            android:paddingLeft="8dp"
            android:textColor="#000000" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="18dp"
        android:layout_marginTop="12dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/txtAuthor"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Author/Publisher"
            android:textColor="#000000" />

        <EditText
            android:id="@+id/etAuthor"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="14dp"
            android:ems="10"
            android:inputType="textEmailAddress"
            android:paddingLeft="8dp"
            android:textColor="#000000" />
    </LinearLayout>
</LinearLayout>

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

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    List<ModelBook> dataArray = new ArrayList<>();
    List<ModelBookUI> UIArray = new ArrayList<>();
    int position = 0;
    Button plusButton;
    LinearLayout plusLinearLayout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        plusLinearLayout = (LinearLayout) findViewById(R.id.linearPlus);
        plusButton = (Button) findViewById(R.id.btPlus);

        plusButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {

                position = UIArray.size();

                UIArray.add(AddView("lay" + position, position, plusLinearLayout));
            }
        });

    }

    /**********************
     * Add new view
     **************************/
    private ModelBookUI AddView(String tag, int position, LinearLayout parent) {

        LayoutInflater inflater = LayoutInflater.from(MainActivity.this);

        View child = inflater.inflate(R.layout.add_book, parent, false);

        EditText book = (EditText) child.findViewById(R.id.etBook);
        EditText author = (EditText) child.findViewById(R.id.etAuthor);

        LinearLayout root = (LinearLayout) child.findViewById(R.id.root);

        root.setTag(tag);

        ModelBookUI model = new ModelBookUI();

        model.book_name = book;
        model.author = author;

        parent.addView(child);

        return model;
    }
}
Create the Java file in project.
Open app => main => src = ModelBook.java.

public class ModelBook {

    public String book;
    public String author;
}

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

import android.widget.EditText;

public class ModelBookUI {

    public EditText book_name;
    public EditText author;
}




Screen Shot:-

Button Click

Add View

May this code help you. Thanks!!!!!!

Retrofit Android studio post the data on Server.

We will post the following data.
{
"token":"6536a951423727727c47ed18004e2f30z",
"book_req_category": 1,
"books": [{
    "name": "Flamingo",
    "Class": "12th",
    "medium": "English",
    "is_ncert": 1,
    "publisher_name": "NCERT",
    "type": 0
}]
}

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 Volley Library to our project.  
compile 'com.squareup.retrofit2:retrofit:2.1.0'
compile 'com.google.code.gson:gson:2.6.2'
compile 'com.squareup.retrofit2:converter-gson:2.1.0'

Create the Api Client java class in project.
Open app => main => src = ApiClient.java

import okhttp3.OkHttpClient;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

/**
 * Created by Laptop on 8/9/2016.
 */
public class ApiClient {
    private static Retrofit retrofit = null;

    public static Retrofit getClient() {
        if (retrofit == null) {
            retrofit = new Retrofit.Builder().baseUrl("http://books.vevsa.com:7001/")
                    .client(new OkHttpClient())
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
        }
        return retrofit;
    }
}

Create the Response java class in project.
Open app => main => src = Response.java

import com.google.gson.annotations.SerializedName;

/**
 * Created by Laptop on 8/9/2016.
 */
public class Response {
    @SerializedName("log")
    private String log;

    public int getFlag() {
        return flag;
    }

    public void setFlag(int flag) {
        this.flag = flag;
    }

    public String getLog() {
        return log;
    }

    public void setLog(String log) {
        this.log = log;
    }

    @SerializedName("flag")
    private int flag;
}


Create the Interface in project.
Open app => main => src = RetrofitInterface

import okhttp3.RequestBody;
import retrofit2.Call;
import retrofit2.http.Body;
import retrofit2.http.Headers;
import retrofit2.http.POST;/**
 * Created by Laptop on 8/9/2016.
 */
public interface RetrofitInterface {
    //TODO: Please check curly bracket at end point of api name :)
    @POST("req_book_auth/raise_request")
    @Headers("Accept: application/json")
    Call<Response> getAllData(@Body RequestBody params);
}

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

import android.app.ProgressDialog;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.net.HttpURLConnection;
import okhttp3.RequestBody;
import retrofit2.Call;
import retrofit2.Callback;

public class MainActivity extends AppCompatActivity {

    private ProgressDialog progressDialog;

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

    private void getData() {
        showDialog();
        JSONObject jsonObject = getObject();
        RequestBody body = null;
        if ((jsonObject) != null) {
            Log.i("JSON_DATA", "Json" + jsonObject);
            body = RequestBody.create(okhttp3.MediaType.parse("application/json; charset=utf-8"),
                    (jsonObject).toString());
            RetrofitInterface retrofitInterface = ApiClient.getClient().create(RetrofitInterface.class);
            Call<Response> call = retrofitInterface.getAllData(body);
            call.enqueue(new Callback<Response>() {
                @Override
                public void onResponse(Call<Response> call, retrofit2.Response<Response> response) {
                    closeDialog();
                    Log.i("RESPONSE", "code" + response.code());

                    try {
                        Log.i("RESPONSE", "Flag:::" + response.body().getFlag());
                        Log.i("RESPONSE", "Log:::" + response.body().getLog());
                        if (response.code() == HttpURLConnection.HTTP_OK) {
                            if (response.body().getFlag() == 143) {
                                //     Toast.makeText(getApplicationContext(),"dlkashdsh"+response.body().getLog(),Toast.LENGTH_LONG).show();
                                Log.i("RESPONSE", "Success");
                            } else {
                                Log.i("RESPONSE", "Failure");
                            }

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

                }

                @Override
                public void onFailure(Call<Response> call, Throwable t) {
                    Log.i("RESPONSE", "Error" + t.getMessage());
                    closeDialog();
                }
            });
        } else {
            Log.i("RESPONSE", "Error");
            closeDialog();
        }

    }

    private void showDialog() {
        progressDialog = ProgressDialog.show(MainActivity.this, "", "Loading...");
    }

    private void closeDialog() {
        if (progressDialog != null && progressDialog.isShowing()) {
            progressDialog.dismiss();
        }
    }

    private JSONObject getObject() {
        try {
            JSONObject jsonObject = new JSONObject();
            jsonObject.put("token", "6536a951423727727c47ed18004e2f30");
            jsonObject.put("book_req_category", 1);
            JSONArray jsonArray = new JSONArray();
            JSONObject object = new JSONObject();
            object.put("name", "Flamingo");
            object.put("Class", "12th");
            object.put("medium", "English");
            object.put("is_ncert", 1);
            object.put("publisher_name", "NCERT");
            object.put("type", 0);
            jsonArray.put(object);
            jsonObject.put("books", jsonArray);
            return jsonObject;
        } catch (JSONException e) {
            e.printStackTrace();
            return null;
        }

    }
}


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


May this code help you. Thanks!!!!!!