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package info.androidhive.smsverification.activity;
 
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
 
import com.android.volley.DefaultRetryPolicy;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.RetryPolicy;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
 
import org.json.JSONException;
import org.json.JSONObject;
 
import java.util.HashMap;
import java.util.Map;
 
import info.androidhive.smsverification.R;
import info.androidhive.smsverification.app.Config;
import info.androidhive.smsverification.app.MyApplication;
import info.androidhive.smsverification.helper.PrefManager;
import info.androidhive.smsverification.service.HttpService;
 
public class SmsActivity extends AppCompatActivity implements View.OnClickListener {
 
    private static String TAG = SmsActivity.class.getSimpleName();
 
    private ViewPager viewPager;
    private ViewPagerAdapter adapter;
    private Button btnRequestSms, btnVerifyOtp;
    private EditText inputName, inputEmail, inputMobile, inputOtp;
    private ProgressBar progressBar;
    private PrefManager pref;
    private ImageButton btnEditMobile;
    private TextView txtEditMobile;
    private LinearLayout layoutEditMobile;
 
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sms);
 
        viewPager = (ViewPager) findViewById(R.id.viewPagerVertical);
        inputName = (EditText) findViewById(R.id.inputName);
        inputEmail = (EditText) findViewById(R.id.inputEmail);
        inputMobile = (EditText) findViewById(R.id.inputMobile);
        inputOtp = (EditText) findViewById(R.id.inputOtp);
        btnRequestSms = (Button) findViewById(R.id.btn_request_sms);
        btnVerifyOtp = (Button) findViewById(R.id.btn_verify_otp);
        progressBar = (ProgressBar) findViewById(R.id.progressBar);
        btnEditMobile = (ImageButton) findViewById(R.id.btn_edit_mobile);
        txtEditMobile = (TextView) findViewById(R.id.txt_edit_mobile);
        layoutEditMobile = (LinearLayout) findViewById(R.id.layout_edit_mobile);
 
        // view click listeners
        btnEditMobile.setOnClickListener(this);
        btnRequestSms.setOnClickListener(this);
        btnVerifyOtp.setOnClickListener(this);
 
        // hiding the edit mobile number
        layoutEditMobile.setVisibility(View.GONE);
 
        pref = new PrefManager(this);
 
        // Checking for user session
        // if user is already logged in, take him to main activity
        if (pref.isLoggedIn()) {
            Intent intent = new Intent(SmsActivity.this, MainActivity.class);
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(intent);
 
            finish();
        }
 
        adapter = new ViewPagerAdapter();
        viewPager.setAdapter(adapter);
        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
            }
 
            @Override
            public void onPageSelected(int position) {
            }
 
            @Override
            public void onPageScrollStateChanged(int state) {
 
            }
        });
 
 
        /**
         * Checking if the device is waiting for sms
         * showing the user OTP screen
         */
        if (pref.isWaitingForSms()) {
            viewPager.setCurrentItem(1);
            layoutEditMobile.setVisibility(View.VISIBLE);
        }
    }
 
    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.btn_request_sms:
                validateForm();
                break;
 
            case R.id.btn_verify_otp:
                verifyOtp();
                break;
 
            case R.id.btn_edit_mobile:
                viewPager.setCurrentItem(0);
                layoutEditMobile.setVisibility(View.GONE);
                pref.setIsWaitingForSms(false);
                break;
        }
    }
 
    /**
     * Validating user details form
     */
    private void validateForm() {
        String name = inputName.getText().toString().trim();
        String email = inputEmail.getText().toString().trim();
        String mobile = inputMobile.getText().toString().trim();
 
        // validating empty name and email
        if (name.length() == 0 || email.length() == 0) {
            Toast.makeText(getApplicationContext(), "Please enter your details", Toast.LENGTH_SHORT).show();
            return;
        }
 
        // validating mobile number
        // it should be of 10 digits length
        if (isValidPhoneNumber(mobile)) {
 
            // request for sms
            progressBar.setVisibility(View.VISIBLE);
 
            // saving the mobile number in shared preferences
            pref.setMobileNumber(mobile);
 
            // requesting for sms
            requestForSMS(name, email, mobile);
 
        } else {
            Toast.makeText(getApplicationContext(), "Please enter valid mobile number", Toast.LENGTH_SHORT).show();
        }
    }
 
    /**
     * Method initiates the SMS request on the server
     *
     * @param name   user name
     * @param email  user email address
     * @param mobile user valid mobile number
     */
    private void requestForSMS(final String name, final String email, final String mobile) {
 
        StringRequest strReq = new StringRequest(Request.Method.POST,
                Config.URL_REQUEST_SMS, new Response.Listener<String>() {
 
            @Override
            public void onResponse(String response) {
                Log.d(TAG, response.toString());
 
                try {
                    JSONObject responseObj = new JSONObject(response);
 
                    // Parsing json object response
                    // response will be a json object
                    boolean error = responseObj.getBoolean("error");
                    String message = responseObj.getString("message");
 
                    // checking for error, if not error SMS is initiated
                    // device should receive it shortly
                    if (!error) {
                        // boolean flag saying device is waiting for sms
                        pref.setIsWaitingForSms(true);
 
                        // moving the screen to next pager item i.e otp screen
                        viewPager.setCurrentItem(1);
                        txtEditMobile.setText(pref.getMobileNumber());
                        layoutEditMobile.setVisibility(View.VISIBLE);
 
                        Toast.makeText(getApplicationContext(), message, Toast.LENGTH_SHORT).show();
 
                    } else {
                        Toast.makeText(getApplicationContext(),
                                "Error: " + message,
                                Toast.LENGTH_LONG).show();
                    }
 
                    // hiding the progress bar
                    progressBar.setVisibility(View.GONE);
 
                } catch (JSONException e) {
                    Toast.makeText(getApplicationContext(),
                            "Error: " + e.getMessage(),
                            Toast.LENGTH_LONG).show();
 
                    progressBar.setVisibility(View.GONE);
                }
 
            }
        }, new Response.ErrorListener() {
 
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.e(TAG, "Error: " + error.getMessage());
                Toast.makeText(getApplicationContext(),
                        error.getMessage(), Toast.LENGTH_SHORT).show();
                progressBar.setVisibility(View.GONE);
            }
        }) {
 
            /**
             * Passing user parameters to our server
             * @return
             */
            @Override
            protected Map<String, String> getParams() {
                Map<String, String> params = new HashMap<String, String>();
                params.put("name", name);
                params.put("email", email);
                params.put("mobile", mobile);
 
                Log.e(TAG, "Posting params: " + params.toString());
 
                return params;
            }
 
        };
 
        int socketTimeout = 60000;
        RetryPolicy policy = new DefaultRetryPolicy(socketTimeout,
                DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
                DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
        strReq.setRetryPolicy(policy);
 
        // Adding request to request queue
        MyApplication.getInstance().addToRequestQueue(strReq);
    }
 
    /**
     * sending the OTP to server and activating the user
     */
    private void verifyOtp() {
        String otp = inputOtp.getText().toString().trim();
 
        if (!otp.isEmpty()) {
            Intent grapprIntent = new Intent(getApplicationContext(), HttpService.class);
            grapprIntent.putExtra("otp", otp);
            startService(grapprIntent);
        } else {
            Toast.makeText(getApplicationContext(), "Please enter the OTP", Toast.LENGTH_SHORT).show();
        }
    }
 
    /**
     * Regex to validate the mobile number
     * mobile number should be of 10 digits length
     *
     * @param mobile
     * @return
     */
    private static boolean isValidPhoneNumber(String mobile) {
        String regEx = "^[0-9]{10}$";
        return mobile.matches(regEx);
    }
 
 
    class ViewPagerAdapter extends PagerAdapter {
 
        @Override
        public int getCount() {
            return 2;
        }
 
        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == ((View) object);
        }
 
        public Object instantiateItem(View collection, int position) {
 
            int resId = 0;
            switch (position) {
                case 0:
                    resId = R.id.layout_sms;
                    break;
                case 1:
                    resId = R.id.layout_otp;
                    break;
            }
            return findViewById(resId);
        }
    }
 
}
 

Main.java:37: error: class SmsActivity is public, should be declared in a file named SmsActivity.java
public class SmsActivity extends AppCompatActivity implements View.OnClickListener {
       ^
Main.java:3: error: package android.content does not exist
import android.content.Intent;
                      ^
Main.java:4: error: package android.os does not exist
import android.os.Bundle;
                 ^
Main.java:5: error: package android.support.v4.view does not exist
import android.support.v4.view.PagerAdapter;
                              ^
Main.java:6: error: package android.support.v4.view does not exist
import android.support.v4.view.ViewPager;
                              ^
Main.java:7: error: package android.support.v7.app does not exist
import android.support.v7.app.AppCompatActivity;
                             ^
Main.java:8: error: package android.util does not exist
import android.util.Log;
                   ^
Main.java:9: error: package android.view does not exist
import android.view.View;
                   ^
Main.java:10: error: package android.widget does not exist
import android.widget.Button;
                     ^
Main.java:11: error: package android.widget does not exist
import android.widget.EditText;
                     ^
Main.java:12: error: package android.widget does not exist
import android.widget.ImageButton;
                     ^
Main.java:13: error: package android.widget does not exist
import android.widget.LinearLayout;
                     ^
Main.java:14: error: package android.widget does not exist
import android.widget.ProgressBar;
                     ^
Main.java:15: error: package android.widget does not exist
import android.widget.TextView;
                     ^
Main.java:16: error: package android.widget does not exist
import android.widget.Toast;
                     ^
Main.java:18: error: package com.android.volley does not exist
import com.android.volley.DefaultRetryPolicy;
                         ^
Main.java:19: error: package com.android.volley does not exist
import com.android.volley.Request;
                         ^
Main.java:20: error: package com.android.volley does not exist
import com.android.volley.Response;
                         ^
Main.java:21: error: package com.android.volley does not exist
import com.android.volley.RetryPolicy;
                         ^
Main.java:22: error: package com.android.volley does not exist
import com.android.volley.VolleyError;
                         ^
Main.java:23: error: package com.android.volley.toolbox does not exist
import com.android.volley.toolbox.StringRequest;
                                 ^
Main.java:25: error: package org.json does not exist
import org.json.JSONException;
               ^
Main.java:26: error: package org.json does not exist
import org.json.JSONObject;
               ^
Main.java:31: error: cannot find symbol
import info.androidhive.smsverification.R;
                                       ^
  symbol:   class R
  location: package info.androidhive.smsverification
Main.java:32: error: package info.androidhive.smsverification.app does not exist
import info.androidhive.smsverification.app.Config;
                                           ^
Main.java:33: error: package info.androidhive.smsverification.app does not exist
import info.androidhive.smsverification.app.MyApplication;
                                           ^
Main.java:34: error: package info.androidhive.smsverification.helper does not exist
import info.androidhive.smsverification.helper.PrefManager;
                                              ^
Main.java:35: error: package info.androidhive.smsverification.service does not exist
import info.androidhive.smsverification.service.HttpService;
                                               ^
Main.java:37: error: cannot find symbol
public class SmsActivity extends AppCompatActivity implements View.OnClickListener {
                                 ^
  symbol: class AppCompatActivity
Main.java:37: error: package View does not exist
public class SmsActivity extends AppCompatActivity implements View.OnClickListener {
                                                                  ^
Main.java:41: error: cannot find symbol
    private ViewPager viewPager;
            ^
  symbol:   class ViewPager
  location: class SmsActivity
Main.java:290: error: cannot find symbol
    class ViewPagerAdapter extends PagerAdapter {
                                   ^
  symbol:   class PagerAdapter
  location: class SmsActivity
Main.java:43: error: cannot find symbol
    private Button btnRequestSms, btnVerifyOtp;
            ^
  symbol:   class Button
  location: class SmsActivity
Main.java:44: error: cannot find symbol
    private EditText inputName, inputEmail, inputMobile, inputOtp;
            ^
  symbol:   class EditText
  location: class SmsActivity
Main.java:45: error: cannot find symbol
    private ProgressBar progressBar;
            ^
  symbol:   class ProgressBar
  location: class SmsActivity
Main.java:46: error: cannot find symbol
    private PrefManager pref;
            ^
  symbol:   class PrefManager
  location: class SmsActivity
Main.java:47: error: cannot find symbol
    private ImageButton btnEditMobile;
            ^
  symbol:   class ImageButton
  location: class SmsActivity
Main.java:48: error: cannot find symbol
    private TextView txtEditMobile;
            ^
  symbol:   class TextView
  location: class SmsActivity
Main.java:49: error: cannot find symbol
    private LinearLayout layoutEditMobile;
            ^
  symbol:   class LinearLayout
  location: class SmsActivity
Main.java:53: error: cannot find symbol
    protected void onCreate(Bundle savedInstanceState) {
                            ^
  symbol:   class Bundle
  location: class SmsActivity
Main.java:118: error: cannot find symbol
    public void onClick(View view) {
                        ^
  symbol:   class View
  location: class SmsActivity
Main.java:298: error: cannot find symbol
        public boolean isViewFromObject(View view, Object object) {
                                        ^
  symbol:   class View
  location: class SmsActivity.ViewPagerAdapter
Main.java:302: error: cannot find symbol
        public Object instantiateItem(View collection, int position) {
                                      ^
  symbol:   class View
  location: class SmsActivity.ViewPagerAdapter
Main.java:52: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:54: error: cannot find symbol
        super.onCreate(savedInstanceState);
        ^
  symbol:   variable super
  location: class SmsActivity
Main.java:55: error: package R does not exist
        setContentView(R.layout.activity_sms);
                        ^
Main.java:57: error: cannot find symbol
        viewPager = (ViewPager) findViewById(R.id.viewPagerVertical);
                     ^
  symbol:   class ViewPager
  location: class SmsActivity
Main.java:57: error: package R does not exist
        viewPager = (ViewPager) findViewById(R.id.viewPagerVertical);
                                              ^
Main.java:58: error: cannot find symbol
        inputName = (EditText) findViewById(R.id.inputName);
                     ^
  symbol:   class EditText
  location: class SmsActivity
Main.java:58: error: package R does not exist
        inputName = (EditText) findViewById(R.id.inputName);
                                             ^
Main.java:59: error: cannot find symbol
        inputEmail = (EditText) findViewById(R.id.inputEmail);
                      ^
  symbol:   class EditText
  location: class SmsActivity
Main.java:59: error: package R does not exist
        inputEmail = (EditText) findViewById(R.id.inputEmail);
                                              ^
Main.java:60: error: cannot find symbol
        inputMobile = (EditText) findViewById(R.id.inputMobile);
                       ^
  symbol:   class EditText
  location: class SmsActivity
Main.java:60: error: package R does not exist
        inputMobile = (EditText) findViewById(R.id.inputMobile);
                                               ^
Main.java:61: error: cannot find symbol
        inputOtp = (EditText) findViewById(R.id.inputOtp);
                    ^
  symbol:   class EditText
  location: class SmsActivity
Main.java:61: error: package R does not exist
        inputOtp = (EditText) findViewById(R.id.inputOtp);
                                            ^
Main.java:62: error: cannot find symbol
        btnRequestSms = (Button) findViewById(R.id.btn_request_sms);
                         ^
  symbol:   class Button
  location: class SmsActivity
Main.java:62: error: package R does not exist
        btnRequestSms = (Button) findViewById(R.id.btn_request_sms);
                                               ^
Main.java:63: error: cannot find symbol
        btnVerifyOtp = (Button) findViewById(R.id.btn_verify_otp);
                        ^
  symbol:   class Button
  location: class SmsActivity
Main.java:63: error: package R does not exist
        btnVerifyOtp = (Button) findViewById(R.id.btn_verify_otp);
                                              ^
Main.java:64: error: cannot find symbol
        progressBar = (ProgressBar) findViewById(R.id.progressBar);
                       ^
  symbol:   class ProgressBar
  location: class SmsActivity
Main.java:64: error: package R does not exist
        progressBar = (ProgressBar) findViewById(R.id.progressBar);
                                                  ^
Main.java:65: error: cannot find symbol
        btnEditMobile = (ImageButton) findViewById(R.id.btn_edit_mobile);
                         ^
  symbol:   class ImageButton
  location: class SmsActivity
Main.java:65: error: package R does not exist
        btnEditMobile = (ImageButton) findViewById(R.id.btn_edit_mobile);
                                                    ^
Main.java:66: error: cannot find symbol
        txtEditMobile = (TextView) findViewById(R.id.txt_edit_mobile);
                         ^
  symbol:   class TextView
  location: class SmsActivity
Main.java:66: error: package R does not exist
        txtEditMobile = (TextView) findViewById(R.id.txt_edit_mobile);
                                                 ^
Main.java:67: error: cannot find symbol
        layoutEditMobile = (LinearLayout) findViewById(R.id.layout_edit_mobile);
                            ^
  symbol:   class LinearLayout
  location: class SmsActivity
Main.java:67: error: package R does not exist
        layoutEditMobile = (LinearLayout) findViewById(R.id.layout_edit_mobile);
                                                        ^
Main.java:75: error: cannot find symbol
        layoutEditMobile.setVisibility(View.GONE);
                                       ^
  symbol:   variable View
  location: class SmsActivity
Main.java:77: error: cannot find symbol
        pref = new PrefManager(this);
                   ^
  symbol:   class PrefManager
  location: class SmsActivity
Main.java:82: error: cannot find symbol
            Intent intent = new Intent(SmsActivity.this, MainActivity.class);
            ^
  symbol:   class Intent
  location: class SmsActivity
Main.java:82: error: cannot find symbol
            Intent intent = new Intent(SmsActivity.this, MainActivity.class);
                                ^
  symbol:   class Intent
  location: class SmsActivity
Main.java:82: error: cannot find symbol
            Intent intent = new Intent(SmsActivity.this, MainActivity.class);
                                                         ^
  symbol:   class MainActivity
  location: class SmsActivity
Main.java:83: error: cannot find symbol
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
                            ^
  symbol:   variable Intent
  location: class SmsActivity
Main.java:83: error: cannot find symbol
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
                                                            ^
  symbol:   variable Intent
  location: class SmsActivity
Main.java:86: error: cannot find symbol
            finish();
            ^
  symbol:   method finish()
  location: class SmsActivity
Main.java:91: error: package ViewPager does not exist
        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
                                                       ^
Main.java:113: error: cannot find symbol
            layoutEditMobile.setVisibility(View.VISIBLE);
                                           ^
  symbol:   variable View
  location: class SmsActivity
Main.java:117: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:120: error: package R does not exist
            case R.id.btn_request_sms:
                  ^
Main.java:124: error: package R does not exist
            case R.id.btn_verify_otp:
                  ^
Main.java:128: error: package R does not exist
            case R.id.btn_edit_mobile:
                  ^
Main.java:130: error: cannot find symbol
                layoutEditMobile.setVisibility(View.GONE);
                                               ^
  symbol:   variable View
  location: class SmsActivity
Main.java:146: error: cannot find symbol
            Toast.makeText(getApplicationContext(), "Please enter your details", Toast.LENGTH_SHORT).show();
                           ^
  symbol:   method getApplicationContext()
  location: class SmsActivity
Main.java:146: error: cannot find symbol
            Toast.makeText(getApplicationContext(), "Please enter your details", Toast.LENGTH_SHORT).show();
                                                                                 ^
  symbol:   variable Toast
  location: class SmsActivity
Main.java:146: error: cannot find symbol
            Toast.makeText(getApplicationContext(), "Please enter your details", Toast.LENGTH_SHORT).show();
            ^
  symbol:   variable Toast
  location: class SmsActivity
Main.java:155: error: cannot find symbol
            progressBar.setVisibility(View.VISIBLE);
                                      ^
  symbol:   variable View
  location: class SmsActivity
Main.java:164: error: cannot find symbol
            Toast.makeText(getApplicationContext(), "Please enter valid mobile number", Toast.LENGTH_SHORT).show();
                           ^
  symbol:   method getApplicationContext()
  location: class SmsActivity
Main.java:164: error: cannot find symbol
            Toast.makeText(getApplicationContext(), "Please enter valid mobile number", Toast.LENGTH_SHORT).show();
                                                                                        ^
  symbol:   variable Toast
  location: class SmsActivity
Main.java:164: error: cannot find symbol
            Toast.makeText(getApplicationContext(), "Please enter valid mobile number", Toast.LENGTH_SHORT).show();
            ^
  symbol:   variable Toast
  location: class SmsActivity
Main.java:177: error: cannot find symbol
        StringRequest strReq = new StringRequest(Request.Method.POST,
        ^
  symbol:   class StringRequest
  location: class SmsActivity
Main.java:177: error: cannot find symbol
        StringRequest strReq = new StringRequest(Request.Method.POST,
                                   ^
  symbol:   class StringRequest
  location: class SmsActivity
Main.java:177: error: package Request does not exist
        StringRequest strReq = new StringRequest(Request.Method.POST,
                                                        ^
Main.java:178: error: cannot find symbol
                Config.URL_REQUEST_SMS, new Response.Listener<String>() {
                ^
  symbol:   variable Config
  location: class SmsActivity
Main.java:178: error: package Response does not exist
                Config.URL_REQUEST_SMS, new Response.Listener<String>() {
                                                    ^
Main.java:223: error: package Response does not exist
        }, new Response.ErrorListener() {
                       ^
Main.java:253: error: cannot find symbol
        RetryPolicy policy = new DefaultRetryPolicy(socketTimeout,
        ^
  symbol:   class RetryPolicy
  location: class SmsActivity
Main.java:253: error: cannot find symbol
        RetryPolicy policy = new DefaultRetryPolicy(socketTimeout,
                                 ^
  symbol:   class DefaultRetryPolicy
  location: class SmsActivity
Main.java:254: error: cannot find symbol
                DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
                ^
  symbol:   variable DefaultRetryPolicy
  location: class SmsActivity
Main.java:255: error: cannot find symbol
                DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
                ^
  symbol:   variable DefaultRetryPolicy
  location: class SmsActivity
100 errors

Standard output is empty