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Question

package pgt_company.project01;

import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Toast;



public class FormInfo implements View.OnClickListener, CompoundButton.OnCheckedChangeListener {

    private Activity activity;
    private LinearLayout LayoutFormInfo;
    private EditText inputName;
    private EditText inputPhone;
    private EditText inputEmail;
    private CheckBox cbSharePhone;
    private Button btnSubmit;


    public FormInfo (Activity activity , int LayoutId){
        this.activity = activity ;
        this.LayoutFormInfo = (LinearLayout) activity.findViewById(LayoutId);
       this.activity = activity;


        init();

    }

    private void init() {
        if (LayoutFormInfo == null){
            return;
        }
    inputName = (EditText) LayoutFormInfo.findViewById(R.id.input_name);
        inputEmail = (EditText) LayoutFormInfo.findViewById(R.id.input_email);
        inputPhone = (EditText) LayoutFormInfo.findViewById(R.id.input_phone);
        cbSharePhone = (CheckBox) LayoutFormInfo.findViewById(R.id.cb_share_phone);
        btnSubmit = (Button) LayoutFormInfo.findViewById(R.id.btn_submit);
       btnSubmit.setOnClickListener(this);
       cbSharePhone.setOnCheckedChangeListener(this);
    }
///checked
    @Override
    public void onClick(View v) {
      if (v.getId() == btnSubmit.getId()){
          String email = inputEmail.getText().toString().trim();
          String phone = inputPhone.getText().toString().trim();
          String name = inputName.getText().toString().trim();
       if (isValidInput(phone,name,email)){

           Intent intent  = new Intent(activity,SecondActivity.class);
           intent.putExtra("name",name);
           if (cbSharePhone.isChecked()){
               intent.putExtra("phone",phone);

           }

           intent.putExtra("email",email);
           activity.startActivity(intent);



       }

      }

    }


//checked
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if (buttonView.getId() ==  cbSharePhone.getId()){
            inputPhone.setEnabled(isChecked);

        }

    }
    private boolean isValidInput(String name ,  String phone , String email ) {
      //name checked
       if (name.length() < 3 ){
           Toast.makeText(activity, "Please write your real name", Toast.LENGTH_SHORT).show();
           inputName.requestFocus();
           return false;
       }


      مشکل  //***********************************************************************************************************************
       if (!phone.isEmpty() &&  (phone.length() !=11 || !phone.startsWith("09")) ){
           Toast.makeText(activity, "Wrong phone number", Toast.LENGTH_SHORT).show();
           inputPhone.requestFocus();
           return false;
       }





        //email  checked

       if (       email.lastIndexOf('@') <= 0
               || !email.contains(".")
               || email.lastIndexOf('.') < email.lastIndexOf('@')
               || email.split("@").length > 2

               ){

           Toast.makeText(activity, "Wrong email address!", Toast.LENGTH_SHORT).show();
           inputEmail.requestFocus();
           return false;
          
       }

        return true;
     }
}