//TaskActivity
//-----------------------
package com.example.zeevm.mylogin;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class TaskActivity extends AppCompatActivity {

    Button btnAddTask,btnTest;
    Context context;
    TextView txtLogo;
    boolean isBackPressed=false;
    String spUser="";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_task);
        setPointer();
        getExtra();
    }

    private void setPointer()
    {
        this.context=this;
        txtLogo=(TextView)findViewById(R.id.txtHello);
        btnAddTask=(Button)findViewById(R.id.btnAddTask);
        btnAddTask.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showAdAddTask();
            }
        });
        btnTest=(Button)findViewById(R.id.btnTest);
        btnTest.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //show all the tasks.....
                String taskTest = UtlShared.getAllTask(context,spUser);
                Toast.makeText(context, taskTest, Toast.LENGTH_LONG).show();
            }
        });
    }

    private void showAdAddTask()
    {
        //create alert dialog builder
        AlertDialog.Builder adTask = new AlertDialog.Builder(context);
        //set the title
        //adTask.setTitle(getResources().getString(R.string.adTtlNewTask));

        /*
        //create new EditText instance
        EditText txtTask = new EditText(context);
        //set hint to the Edit Text
        txtTask.setHint(getResources().getString(R.string.adTaskHint));
        //add the EditText(View) to the Alert Dialog
        adTask.setView(txtTask);
        */

        //we are going to inflate our view (insert the entire layout to View object)
        View inflatedTask = LayoutInflater.from(context).inflate(R.layout.alert_dialog_new_task,null,false);
        //we setting pointer to our inflated view , and not the activity layout
        final EditText myNewTask = (EditText)inflatedTask.findViewById(R.id.txtNewTask);

        adTask.setView(inflatedTask);

        //set positive button
        adTask.setPositiveButton(getResources().getString(R.string.btnAddTask),
                new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        //handle add task.... (utl shared)
                        String myTask = myNewTask.getText().toString();
                        UtlShared.addTask(context,spUser,myTask);
                    }
                });
        //set negative button
        adTask.setNegativeButton(getResources().getString(R.string.regBtnCancel), new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });
        //show message
        adTask.show();

    }


    private void getExtra()
    {
        String myData = getIntent().getStringExtra("userName");
        txtLogo.setText("Hello "+myData);
        //Toast.makeText(context, "user "+myData+" is loged in...", Toast.LENGTH_SHORT).show();
        spUser=getIntent().getStringExtra("user");
    }

    @Override
    public void onBackPressed() {
        if (!isBackPressed)
        {
            isBackPressed=true;
            Toast.makeText(context, "Press again to exit", Toast.LENGTH_SHORT).show();
        }
        else
        {
            finish();
        }
    }
}
////////////////////////
//UtlShared
//-------------------------
package com.example.zeevm.mylogin;

import android.content.Context;
import android.content.SharedPreferences;
import android.icu.text.DateFormat;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * Created by zeevm on 09/01/2017.
 */

public class UtlShared {
    //getting context
    Context context;
    //declaration of shared preferences object
    SharedPreferences userPref;
    //declaration of shared preferences editor
    SharedPreferences.Editor editor;

    public UtlShared(Context context) {
        //get context to use it
        this.context = context;
        //declartion of shared preferences with file name and file mode(private)
        userPref = context.getSharedPreferences("users", Context.MODE_PRIVATE);
        //declartion of editor, for updating,changing,etc...
        editor = userPref.edit();
    }

    //add new user
    public void addUser(String userName, String userPass, String userNickName) {
        //stores in the phone device under data\data\package name
        //put in shared preferences user name and password
        editor.putString(userName, (userPass+","+userNickName));
        //commit (save/apply) the changes.
        editor.commit();
    }

    //check if user exists
    //return true if user exists, false if user not exists
    public boolean checkUser(String userName) {
        //get name by key->user name
        String checkString = userPref.getString(userName, "n/a");
        //check if username equals to responded data, if it's n/a , we dont have the user
        return !checkString.equals("n/a");
    }

    //check user name and password
    public String checkUserPassword(String userName, String userPass)
    {
        String checkString = userPref.getString(userName,"n/a"); // 1234|zeevik
        String[] myData = checkString.split(","); //myData[0]=1234 ; myData[1]=zeevik
        return userPass.equals(myData[0])?myData[1]:""; //1234 (password)
    }

    public static void addTask(Context context,String spUser, String userTask )
    {
        //declaration of shared prefences
        SharedPreferences myPref = context.getSharedPreferences(spUser,Context.MODE_PRIVATE);
        //declaration of shared prefences editor
        SharedPreferences.Editor editor=myPref.edit();
        //add new task (editor is working with key and value)
        editor.putString(userTask,"0");
        //apply/save changes
        editor.commit();
    }

    public static void taskStatusToggle(Context context, String spUser, String userTask)
    {
        //declaration of shared prefences
        SharedPreferences myPref = context.getSharedPreferences(spUser,Context.MODE_PRIVATE);
        //declaration of shared prefences editor
        SharedPreferences.Editor editor=myPref.edit();
        //get the current value
        boolean taskStatus=!(myPref.getString(userTask,"0").equals("1"));
        editor.putString(userTask,taskStatus?"1":"0");
        editor.commit();
    }

    public static String getAllTask(Context context,String spUser)
    {
        //go to specific preferences by user name....
        SharedPreferences taskPref = context.getSharedPreferences(spUser,context.MODE_PRIVATE);

        List<String> myTasks = new ArrayList<>();
        //get all tasks from shared preferences
        //the shared preferences is by key and value
        //therefor we will use Map Collection
        //we know that the key is string, but we don't know or sure
        //if the value is string, so we will be using <k,?>
        Map<String,?> tasks=taskPref.getAll();
        //transfer the data from map collection to list colliection
        //single item is like the defination of the tasks<String,?>
        //entry->record, entrySet -> set of records
        for (Map.Entry<String,?> singleTask:tasks.entrySet())
        {
            //insert task to list by key and value
            //we check if value is equal to 1, because 1=true/0=false
            myTasks.add(singleTask.getKey());
        }
        return myTasks.toString();

    }
}
----------------------------
//RegisterActivity
------------------------
package com.example.zeevm.mylogin;

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class RegisterActivity extends AppCompatActivity {

    EditText txtUser,txtPass,txtPassCheck, txtNick;
    Button btnRegister,btnCancel;
    Context context;

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

    private void setPointer()
    {
        this.context=this;
        txtUser=(EditText)findViewById(R.id.regUser);
        txtPass=(EditText)findViewById(R.id.regPass);
        txtPassCheck=(EditText)findViewById(R.id.regCheck);
        btnRegister=(Button)findViewById(R.id.regBtnRegister);
        btnRegister.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                btnReg();
            }
        });
        btnCancel=(Button)findViewById(R.id.regBtnCancel);
        btnCancel.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
        txtNick=(EditText)findViewById(R.id.regNick);
    }

    private void btnReg()
    {
        //validation
        UtlShared utl = new UtlShared(context);
        //check if we have minimum length of user name
        if (txtUser.getText().toString().length()<2 ||
                txtNick.getText().toString().length()<2)
        {
            Toast.makeText(context, "Minimum of 2 chars for user or nick name", Toast.LENGTH_SHORT).show();
            return;
        }
        //check if user exists
        if (utl.checkUser(txtUser.getText().toString()))
        {
            Toast.makeText(context, "User exists", Toast.LENGTH_SHORT).show();
            return;
        }

        //check password
        if ((!txtPass.getText().toString().equals(txtPassCheck.getText().toString()) ||
                (txtPass.getText().toString().length()<3))) {
            Toast.makeText(context, "Password not match or less then 3 char", Toast.LENGTH_SHORT).show();
            return;
        }
        //register new user and finish
        utl.addUser(txtUser.getText().toString(),txtPass.getText().toString(),txtNick.getText().toString());
        finish();
    }

}
-----------------------
//LoginActivity
-----------------------
package com.example.zeevm.mylogin;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class LoginActivity extends AppCompatActivity {

    final String TAG="LoginScreen";

    EditText txtUser,txtPass;
    Button btnLogin,btnRegister;
    TextView txtLogo;
    //final String USER_NAME="Firas",USER_PASS="12345";
    Context context;
    UtlShared utl;
    //we need a flag to indicate registrion mode.
    boolean needReg=false;

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

    private void setPointer()
    {
        this.context=this;
        utl = new UtlShared(context);
        txtUser=(EditText) findViewById(R.id.txtUser);
        txtPass=(EditText)findViewById(R.id.txtPass);
        txtLogo=(TextView)findViewById(R.id.txtLogo);
        txtLogo.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                Toast.makeText(context, context.getResources().getString(R.string.msgLogo), Toast.LENGTH_SHORT).show();
                return true;
            }
        });

        final int orgHintColor=txtLogo.getCurrentHintTextColor();
        btnLogin=(Button)findViewById(R.id.btnLogin);
        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View roni) {
                String userName=txtUser.getText().toString();
                String userPass=txtPass.getText().toString();
                //validation for user name
                if (userName.length()<1)
                {
                    txtUser.setText("");
                    txtUser.setHintTextColor(Color.RED);
                    return;
                }
                if (userPass.length()<1)
                {
                    txtPass.setText("");
                    txtPass.setHintTextColor(Color.RED);
                    return;
                }
                //check user
                //if (Utl.checkUser(userName,userPass,USER_NAME,USER_PASS))
                String userNick =utl.checkUserPassword(userName,userPass);
                if (userNick.length()>1)
                {
                    //move now to second screen - which is our main screen
                    Intent myIntent = new Intent(context,TaskActivity.class);
                    myIntent.putExtra("userName",userNick);
                    myIntent.putExtra("user",txtUser.getText().toString());
                    startActivity(myIntent);
                    finish();
                    Log.i(TAG, "onClick: User OK");
                }
                else
                {
                   userNotFound();
                }
            }
        });
        btnRegister=(Button)findViewById(R.id.btnRegister);
        btnRegister.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent myIntent = new Intent(context,RegisterActivity.class);
                startActivity(myIntent);
            }
        });
    }

    //create alert dialog builder using instance of AlertDialog
    private void userNotFound()
    {
        //create two strings to hold Alert Dialog Title and Message
        String adMsg,adTitle,adPos;
        //getting user not found in our UtlShared
        UtlShared mySP = new UtlShared(context);
        //check if user exists or we have wrong password
        if (mySP.checkUser(txtUser.getText().toString()))
        {
            //user exists....
            adTitle = getResources().getString(R.string.adMsgTtlPassword);
            adMsg = getResources().getString(R.string.adMsgErrorPassword);
            adPos = getResources().getString(R.string.adBtnOK);
        }
        else
        {
            //user not exists...
            adTitle = getResources().getString(R.string.adTtlUserNotFound);
            adMsg = getResources().getString(R.string.adMsgZeStamMebalbel);
            adPos = getResources().getString(R.string.adBtnRegister);
            needReg=true;
        }


        //create builder
        AlertDialog.Builder adUser = new AlertDialog.Builder(context);
        //create title
        adUser.setTitle(adTitle);
        //create message
        adUser.setMessage(adMsg);
        //create positive button
        adUser.setPositiveButton(adPos
                , new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        if (needReg)
                        {
                            // go to registration activity
                            Intent myIntent = new Intent(context,RegisterActivity.class);
                            startActivity(myIntent);

                        }
                        else
                        {
                            dialog.dismiss();
                        }

                    }
                });
        //show the negative button only if user not exists
        if (needReg) {
            adUser.setNegativeButton(getResources().getString(R.string.adBtnCancel), new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                }
            });
        }
        //show alert dialog.
        adUser.show();
    }

    /*
    // user not found, using alert dialog in anonymous method
    private void userNotFound()
    {
        //user is incorrect -false
        txtPass.setText("");
        //Toast.makeText(context, "You are not allowed!!", Toast.LENGTH_LONG).show();

        //create alert dialog
        new AlertDialog.Builder(context)
            //create title for our alert dialog
            .setTitle(getResources().getString(R.string.adTtlUserError))
                //create message for our alert dialog
            .setMessage(getResources().getString(R.string.adMsgError))
                //create our OK button
            .setPositiveButton(getResources().getString(R.string.adBtnOK), new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                }
            })
                //show Dialog
            .show();


        Log.e(TAG, "onClick: Incorrect User" );
    }
    */
}
------------------------------------
//alert_dialog_new_task
-----------------------------------
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="@dimen/activity_vertical_margin">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/adTtlNewTask"
        android:textSize="26sp"
        android:gravity="center"
        android:id="@+id/textView" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/adTaskHint"
        android:layout_marginTop="20dp"
        android:id="@+id/txtNewTask"
        />

</LinearLayout>
---------------------------
//activity_task
-----------------------------
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="32sp"
        android:text="place holder"
        android:gravity="center"
        android:layout_marginTop="15dp"
        android:id="@+id/txtHello"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/btnBackground"
        android:textColor="@color/btnText"
        android:text="@string/btnAddTask"
        android:textSize="@dimen/regBtn"
        android:layout_margin="@dimen/regBtnMargin"
        android:id="@+id/btnAddTask"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="show all task"
        android:id="@+id/btnTest"/>
</LinearLayout>
----------------------
//activity_register
-------------------------
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:layout_weight="1">
        <TextView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="@string/ttlRegister"
            android:textSize="@dimen/ttl"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:layout_weight="1">
        <EditText
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:hint="@string/regUserName"
            android:textSize="@dimen/regEditText"
            android:inputType="text"
            android:id="@+id/regUser"/>
        <EditText
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:hint="@string/regNick"
            android:textSize="@dimen/regEditText"
            android:inputType="text"
            android:id="@+id/regNick"/>

        <EditText
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:hint="@string/regUserPass"
            android:textSize="@dimen/regEditText"
            android:inputType="textPassword"
            android:id="@+id/regPass"
            />
        <EditText
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:hint="@string/regUserCheck"
            android:textSize="@dimen/regEditText"
            android:inputType="textPassword"
            android:id="@+id/regCheck"/>

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal"
        android:layout_weight="1"
        android:gravity="center">
        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@color/btnBackground"
            android:textColor="@color/btnText"
            android:text="@string/regBtnRegister"
            android:layout_margin="@dimen/regBtnMargin"
            android:textSize="@dimen/regBtn"
            android:id="@+id/regBtnRegister"/>
        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@color/btnBackground"
            android:textColor="@color/btnText"
            android:text="@string/regBtnCancel"
            android:layout_margin="@dimen/regBtnMargin"
            android:textSize="@dimen/regBtn"
            android:id="@+id/regBtnCancel"/>
    </LinearLayout>

</LinearLayout>
------------------------------
//activity_login
--------------------------------
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <!-- my logo layout -->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:layout_weight="1"
        >
        <TextView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="@string/myLogo"
            android:textSize="@dimen/ttl"
            android:gravity="center"
            android:id="@+id/txtLogo"
            />
    </LinearLayout>

    <!-- my Edit text box -->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:layout_weight="1">
        <EditText
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:hint="@string/hintUserName"
            android:textSize="@dimen/regEditText"
            android:layout_weight="1"
            android:id="@+id/txtUser"/>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="5px"
            android:orientation="vertical"
            android:background="#000"
            android:visibility="gone"/>
        <EditText
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:hint="@string/hintPassword"
            android:textSize="@dimen/regEditText"
            android:inputType="numberPassword"
            android:layout_weight="1"
            android:id="@+id/txtPass"
            />

    </LinearLayout>

    <!-- my Login Button -->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal"
        android:layout_weight="1">
        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#009fff"
            android:textColor="#ffffff"
            android:text="@string/btnLogin"
            android:textSize="@dimen/regBtn"
            android:id="@+id/btnLogin"
            android:layout_weight="1"
            android:layout_margin="@dimen/regBtnMargin"/>
        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/btnBackground"
            android:textColor="@color/btnText"
            android:text="@string/regBtnRegister"
            android:layout_weight="1"
            android:textSize="@dimen/regBtn"
            android:layout_margin="@dimen/regBtnMargin"
            android:id="@+id/btnRegister"/>
    </LinearLayout>
</LinearLayout>