Адройд app дээр логин хэсэг хийж security session - нд хадгалах. /Session Management and User Authentication on Android/

Энэ демо дээр Android Studio ашигласан болно. Шинэ project үүсгэж дотор нь шинэ Activity үүсгэхдээ Empty Activity сонгож үүсгэнэ.

1) Үндсэн xml дэлгэцэн дээр дараах байдлаар компонентуудаа өрнө.
activity_main.xml

 <?xml version="1.0" encoding="utf-8"?>  
 <LinearLayout 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:orientation="vertical"  
 android:padding="10dip"  
 tools:context="com.example.start.MainActivity">  
   <TextView  
     android:text="TextView"  
     android:layout_width="match_parent"  
     android:layout_height="wrap_content"  
     android:id="@+id/textView5" />  
 </LinearLayout>  

2) Системд ашиглах Menu үүсгэнэ. "res" дээр /mouse right click/ -> New -> Android resouce file. Гарч ирсэн цонхон дээр дараах утгуудыг бөглөнө. File Name: menu_main, Resource type: Menu, Directory name: menu
menu_main.xml

 <?xml version="1.0" encoding="utf-8"?>  
 <menu xmlns:android="http://schemas.android.com/apk/res/android">  
   <item  
     android:id="@+id/itemId"  
     android:title="@string/userInfo" />  
   <item android:title="@string/logout"  
     android:id="@+id/logoutItem" />  
 </menu>  

3) Session - тэй ажиллах java class үүсгэнэ.
UserSessionManager.java

 package com.example.start;  
 import java.util.HashMap;  
 import android.content.Context;  
 import android.content.Intent;  
 import android.content.SharedPreferences;  
 import android.content.SharedPreferences.Editor;  
 public class UserSessionManager {  
   SharedPreferences pref;  
   Editor editor;  
   Context _context;  
   int PRIVATE_MODE = 0;  
   private static final String PREFER_NAME = "AndroidExamplePref";  
   private static final String IS_USER_LOGIN = "IsUserLoggedIn";  
   public static final String KEY_NAME = "name";  
   public static final String KEY_EMAIL = "email";  
   public static final String KEY_PHONE = "phone";  
   public UserSessionManager(Context context){  
     this._context = context;  
     pref = _context.getSharedPreferences(PREFER_NAME, PRIVATE_MODE);  
     editor = pref.edit();  
   }  
   public void createUserLoginSession(String name, String phone, String email){  
     editor.putBoolean(IS_USER_LOGIN, true);  
     editor.putString(KEY_NAME, name);  
     editor.putString(KEY_EMAIL, email);  
     editor.putString(KEY_PHONE, phone);  
     editor.commit();  
   }  
   public boolean checkLogin(){  
     // login төлөвийг шалгах
     if(!this.isUserLoggedIn()){  
       // user is not logged in redirect him to Login Activity  
       Intent i = new Intent(_context, Login.class);  
        // бүх Activities хаах
       i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);  
        // шинэ Activity үүсгэх
       i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
      // Login Activity дуудах
       _context.startActivity(i);  
       return true;  
     }  
     return false;  
   }  

   public HashMap<String, String> getUserDetails(){  

     HashMap<String, String> user = new HashMap<String, String>();  
     user.put(KEY_NAME, pref.getString(KEY_NAME, null));  
     user.put(KEY_PHONE, pref.getString(KEY_PHONE, null));  
     user.put(KEY_EMAIL, pref.getString(KEY_EMAIL, null));  

     return user;  
   }  

   public void logoutUser(){  
     // Clearing all user data from Shared Preferences  
     editor.clear();  
     editor.commit();  

     Intent i = new Intent(_context, Login.class);  
     // бүх Activities хаах
     i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);  
     // шинэ Activity үүсгэх
     i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
     // Login Activity дуудах
     _context.startActivity(i);  
   }  

   public boolean isUserLoggedIn(){  
     return pref.getBoolean(IS_USER_LOGIN, false);  
   }  
 }  

4) Хэрэглэгчийн мэдээллийг popup dialog component дээр харуулах view үүсгэх. Project->res->layout-> (mouse + right click) -> New -> Layout resource file
layout_dialog.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="match_parent"  
 android:layout_height="match_parent"  
   android:layout_centerHorizontal="false">  
   <LinearLayout  
     android:orientation="vertical"  
     android:layout_width="match_parent"  
     android:layout_height="wrap_content">  
     <ImageView  
       android:layout_width="match_parent"  
       android:layout_height="wrap_content"  
       app:srcCompat="@android:drawable/ic_menu_myplaces"  
       android:id="@+id/imageView"  
       android:layout_margin="30dp" />  
     <LinearLayout  
     android:orientation="horizontal"  
     android:layout_width="match_parent"  
     android:layout_height="match_parent"  
       android:gravity="center_horizontal"  
       android:layout_marginBottom="50dp">  
     <LinearLayout  
       android:orientation="vertical"  
       android:layout_height="match_parent"  
       android:gravity="end"  
       android:layout_marginRight="5dp"  
       android:layout_width="100dp">  
       <TextView  
         android:text="Нэр"  
         android:layout_width="wrap_content"  
         android:layout_height="wrap_content"  
         android:id="@+id/textView" />  
       <TextView  
         android:text="Утас"  
         android:layout_width="wrap_content"  
         android:layout_height="wrap_content"  
         android:id="@+id/textView4"  
         android:layout_marginTop="10dp" />  
       <TextView  
         android:text="Имэйл"  
         android:layout_width="wrap_content"  
         android:layout_height="wrap_content"  
         android:id="@+id/textView3"  
         android:layout_marginTop="10dp" />  
     </LinearLayout>  
     <LinearLayout  
       android:orientation="vertical"  
       android:layout_height="match_parent"  
       android:layout_marginLeft="5dp"  
       android:layout_width="100dp">  
       <TextView  
         android:layout_width="match_parent"  
         android:layout_height="wrap_content"  
         android:id="@+id/dialogName" />  
       <TextView  
         android:layout_width="match_parent"  
         android:layout_height="wrap_content"  
         android:id="@+id/dialogPhone"  
         android:layout_marginTop="10dp" />  
       <TextView  
         android:layout_width="match_parent"  
         android:layout_height="wrap_content"  
         android:id="@+id/dialogEmail"  
         android:layout_marginTop="10dp" />  
     </LinearLayout>  
   </LinearLayout>  
   </LinearLayout>  
   <ImageButton  
   android:layout_width="wrap_content"  
   android:layout_height="wrap_content"  
   app:srcCompat="@android:drawable/btn_dialog"  
   android:id="@+id/closeBtn"  
   android:layout_alignParentTop="true"  
   android:layout_alignParentEnd="true"  
   android:background="@android:color/transparent" />  
 </RelativeLayout>  

5) Хэрэглэгчийн мэдээллийг popup dialog component дээр харуулах мөн өөр бусад туслах үүрэгтэй method агуулах зорилготой java class үүсгэнэ.
Utils.java

 import android.content.Context;  
 import android.content.DialogInterface;  
 import android.support.v7.app.AlertDialog;  
 import android.view.LayoutInflater;  
 import android.view.View;  
 import android.widget.ImageButton;  
 import android.widget.ImageView;  
 import android.widget.LinearLayout;  
 import android.widget.TextView;  
 import android.widget.Toast;  
 import java.util.HashMap;  
 /**  
  * Created by Tsogoo on 2/21/2017.  
  */  
 public class Utils {  
   Context ctx;  
   public Utils(Context ctx){  
     super();  
     this.ctx = ctx;  
   }  
   public void showDialog(HashMap<String, String> user) {  
     LayoutInflater myLayout = LayoutInflater.from(ctx);  
     final View dialogView = myLayout.inflate(R.layout.layout_dialog, null);  
     final AlertDialog dialog = new AlertDialog.Builder(ctx).create();  
     TextView tv = (TextView) dialogView.findViewById(R.id.dialogName);  
     tv.setText(user.get(UserSessionManager.KEY_NAME));  
     TextView tvPhone = (TextView) dialogView.findViewById(R.id.dialogPhone);  
     tvPhone.setText(user.get(UserSessionManager.KEY_PHONE));  
     TextView tvEmail = (TextView) dialogView.findViewById(R.id.dialogEmail);  
     tvEmail.setText(user.get(UserSessionManager.KEY_EMAIL));  
     dialog.setView(dialogView);  
     ImageButton btn = (ImageButton) dialogView.findViewById(R.id.closeBtn);  
     btn.setOnClickListener(new View.OnClickListener()  
     {  
       // @Override  
       public void onClick(View v) {  
         dialog.dismiss();  
       }  
     });  
     //AlertDialog dl = dialog.create();  
     dialog.show();  
   }  
 }  

6) Системийн кодыг үндсэн Activity үүсгэхэд хамт үүсдэг default class дээр дараах кодыг бичнэ.
MainActivity.java

 import android.support.v7.app.AppCompatActivity;  
 import android.os.Bundle;  
 import java.util.HashMap;  
 import android.app.Activity;  
 import android.os.Bundle;  
 import android.support.v7.widget.Toolbar;  
 import android.text.Html;  
 import android.view.Menu;  
 import android.view.MenuItem;  
 import android.view.View;  
 import android.widget.Button;  
 import android.widget.TextView;  
 import android.widget.Toast;  
 public class MainActivity extends AppCompatActivity {  
   UserSessionManager session;  
   HashMap<String, String> user;  
   @Override  
   protected void onCreate(Bundle savedInstanceState) {  
     super.onCreate(savedInstanceState);  
     setContentView(R.layout.activity_main);  
     startSession();  
   }  
   @Override  
   public boolean onCreateOptionsMenu(Menu menu) {  
     getMenuInflater().inflate(R.menu.menu_main, menu);  
     return true;  
   }  
   @Override  
   public boolean onOptionsItemSelected(MenuItem item) {  
     switch (item.getItemId()) {  
       case R.id.itemId:  
         Utils d = new Utils(this);  
         d.showDialog(user);  
         return true;  
       case R.id.logoutItem:  
         session.logoutUser();  
         return true;  
       default:  
         return super.onOptionsItemSelected(item);  
     }  
   }  
   public void startSession(){  
     session = new UserSessionManager(getApplicationContext());  
     /*Toast.makeText(getApplicationContext(), "Төлөв: " + session.isUserLoggedIn(),  
         Toast.LENGTH_SHORT).show();*/  
     if(session.checkLogin())  
       finish();  
     user = session.getUserDetails();  
   }  
 }  

7) Шинэ Login нэртэй activity үүсгэнэ үүсгэхдээ Empty Activity сонгож үүсгэнэ. activity_login.xml

8) Login activity-г үүсгэхэд хамт үүсдэг default class дээр дараах кодыг бичнэ. Login.java

 import android.support.v7.app.AppCompatActivity;  
 import android.os.Bundle;  
 import android.app.Activity;  
 import android.content.Intent;  
 import android.os.Bundle;  
 import android.support.v7.widget.Toolbar;  
 import android.view.Menu;  
 import android.view.MenuItem;  
 import android.view.View;  
 import android.widget.Button;  
 import android.widget.EditText;  
 import android.widget.Toast;  
 public class Login extends AppCompatActivity {  
   Button btnLogin;  
   EditText txtUsername, txtPassword;  

   UserSessionManager session;  
   @Override  
   protected void onCreate(Bundle savedInstanceState) {  
     super.onCreate(savedInstanceState);  
     setContentView(R.layout.activity_login);  
     session = new UserSessionManager(getApplicationContext());  
     // Email, Password input text дээр авах
     txtUsername = (EditText) findViewById(R.id.txtUsername);  
     txtPassword = (EditText) findViewById(R.id.txtPassword);  
     /*  
     Toast.makeText(getApplicationContext(),  
         "Төлөв: " + session.isUserLoggedIn(),  
         Toast.LENGTH_SHORT).show();*/  
     // User Login button  
     btnLogin = (Button) findViewById(R.id.btnLogin);  
     // Login button click event  
     btnLogin.setOnClickListener(new View.OnClickListener() {  
       @Override  
       public void onClick(View arg0) {  
         // Get username, password from EditText  
         String username = txtUsername.getText().toString();  
         String password = txtPassword.getText().toString();  
         // Validate if username, password is filled  
         if(username.trim().length() > 0 && password.trim().length() > 0){  
           if(username.equals("Test") && password.equals("Test")){  

             session.createUserLoginSession("Test","00000000",  
                 "test@test.edu");  

             Intent i = new Intent(getApplicationContext(), MainActivity.class);  
             i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);  

             i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
             startActivity(i);  
             finish();  
           }else{  
             // username / password 
             Toast.makeText(getApplicationContext(),  
                 "Нэр/Нууц үг буруу байна.",  
                 Toast.LENGTH_LONG).show();  
           }  
         }else{  

           Toast.makeText(getApplicationContext(),  
               "Нэвтрэх нэр болон нууц үг оруулна уу.",  
               Toast.LENGTH_LONG).show();  
         }  
       }  
     });  
   }  
 }  

9) Доорх хэсэгт Login.java доторх кодын хэсэг харагдаж байна. Энэ хэсэгт username, password болон user profile - н мэдээллийг хатуугаар session-нд хадгалж байгаа бөгөөд хөгжүүлэгч өөрийн хүссэн байдлаар username болон password - г өгөгдлийн сангаас эсвэл rest service - с дуудаж session - д хадгалах боломжтой.

     if(username.equals("Test") && password.equals("Test")){  
             // Creating user login session  
             session.createUserLoginSession("Test","00000000",  
                 "test@test.edu");  

Андройд утас нэмэж хасах бүртгэлийн форм болон харицах java функцууд), Add and Remove view component dynamically (Android: add/remove input field and spinner form)

Add and Remove view component dynamically (Android: add/remove input field and spinner form)

Энэ демо дээр Android Studio ашигласан болно. Шинэ project үүсгэж дотор нь шинэ Activity үүсгэхдээ Empty Activity сонгож үүсгэнэ.

1) Үндсэн xml дэлгэцэн дээр дараах байдлаар компонентуудаа өрнө.
activity_main.xml

 <?xml version="1.0" encoding="utf-8"?>  
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"  
   android:layout_width="match_parent"  
   android:layout_height="match_parent"  
   android:id="@+id/tt">   
   <ScrollView android:layout_width="match_parent"  
     android:layout_height="match_parent">  
     <LinearLayout  
       android:orientation="vertical"  
       android:layout_width="match_parent"  
       android:layout_height="match_parent">  
       <LinearLayout android:id="@+id/container"  
         android:layout_width="match_parent"  
         android:layout_height="wrap_content"  
         android:orientation="vertical"  
         android:showDividers="middle"  
         android:divider="?android:dividerHorizontal"  
         android:animateLayoutChanges="true"  
         android:paddingLeft="16dp"  
         android:paddingRight="16dp" />  
       <Button  
         android:text="+ Утас нэмэх"  
         android:layout_width="match_parent"  
         android:layout_height="wrap_content"  
         android:id="@+id/button2" />  
     </LinearLayout>  
   </ScrollView>   
   <TextView android:id="@android:id/empty"  
     style="?android:textAppearanceSmall"  
     android:layout_width="wrap_content"  
     android:layout_height="wrap_content"  
     android:layout_gravity="center"  
     android:padding="32dp"  
     android:text="test"  
     android:textColor="?android:textColorSecondary" />  
 </FrameLayout>  

2) Layout resource file үүсгэх.
row.xml

 <?xml version="1.0" encoding="utf-8"?>  
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
   xmlns:tools="http://schemas.android.com/tools"  
   android:layout_width="match_parent"  
   android:layout_height="48dp"  
   android:orientation="horizontal"  
   android:divider="?android:dividerVertical"  
   android:dividerPadding="15dp"  
   android:gravity="center"  
   android:showDividers="middle">  
   <Spinner  
     android:layout_width="wrap_content"  
     android:layout_height="wrap_content"  
     android:id="@+id/spinner1123"  
     android:layout_weight="1"  
     android:elevation="1dp" />  
   <EditText  
     android:layout_width="0dp"  
     android:layout_height="wrap_content"  
     android:inputType="textPersonName"  
     android:text="Name"  
     android:ems="10"  
     android:id="@+id/text1123"  
     android:layout_weight="1" />  
   <ImageButton android:id="@+id/delete_button"  
     android:layout_width="48dp"  
     android:layout_height="match_parent"  
     android:background="?android:selectableItemBackground"  
     android:contentDescription="устгах"  
     android:src="@android:drawable/btn_dialog" />  
 </LinearLayout>  

3) Системд ашиглах String resource үүсгэнэ. res -> values -> strings.xml
strings.xml

 <resources>  
   <string name="app_name">Миний тест апп</string>  
   <string name="save">Хадгалах</string>  
   <string name="save_add">Нэмэх</string>  
   <string name="save_item">Хадгалах</string>  
 </resources>  

4) Системд ашиглах Menu үүсгэнэ. "res" дээр /mouse right click/ -> New -> Android resouce file. Гарч ирсэн цонхон дээр дараах утгуудыг бөглөнө. File Name: my_menu, Resource type: Menu, Directory name: menu
my_menu.xml

 <?xml version="1.0" encoding="utf-8"?>  
 <menu xmlns:android="http://schemas.android.com/apk/res/android">  
   <item android:title="@string/save_add"  
     android:id="@+id/my_add" />  
   <item android:title="@string/save_item"  
     android:id="@+id/my_item" />  
 </menu>  

5) Системийн кодыг үндсэн Activity үүсгэхэд хамт үүсдэг default class дээр дараах кодыг бичнэ.
MainActivity.java

 import android.content.DialogInterface;  
 import android.content.Intent;  
 import android.support.v4.app.NavUtils;  
 import android.support.v7.app.AlertDialog;  
 import android.support.v7.app.AppCompatActivity;  
 import android.os.Bundle;  
 import android.view.LayoutInflater;  
 import android.view.Menu;  
 import android.view.MenuItem;  
 import android.view.View;  
 import android.view.ViewGroup;  
 import android.widget.ArrayAdapter;  
 import android.widget.Button;  
 import android.widget.EditText;  
 import android.widget.Spinner;  
 import android.widget.TextView;  
 import android.widget.Toast;  
 import java.util.ArrayList;  
 import java.util.List;  
 public class MainActivity extends AppCompatActivity {  
   private ViewGroup mContainerView;  
   List<String> result = new ArrayList<String>();  
   private ArrayAdapter<String> dataAdapter;  
   List<String> spinnerArray = new ArrayList<String>();  
   @Override  
   protected void onCreate(Bundle savedInstanceState) {  
     super.onCreate(savedInstanceState);  
     setContentView(R.layout.activity_main);  
     mContainerView = (ViewGroup) findViewById(R.id.container);  
     spinnerArray.add("MN");  
     spinnerArray.add("USA");  
     spinnerArray.add("RU");  
     spinnerArray.add("CHINA");  
     result = spinnerArray;  
     Button mButtonAdd = (Button) findViewById(R.id.button2);  
     mButtonAdd.setOnClickListener(new View.OnClickListener() {  
       @Override  
       public void onClick(View view) {  
         findViewById(android.R.id.empty).setVisibility(View.GONE);  
         addItem(spinnerArray,0,0);  
       }  
     });  
     readPhone();  
   }  
   @Override  
   public boolean onCreateOptionsMenu(Menu menu) {  
     super.onCreateOptionsMenu(menu);  
     getMenuInflater().inflate(R.menu.my_menu, menu);  
     return true;  
   }  
   @Override  
   public boolean onOptionsItemSelected(MenuItem item) {  
     switch (item.getItemId()) {  
       case R.id.my_item:  
         findViewById(android.R.id.empty).setVisibility(View.GONE);  
         showAlert();  
         return true;  
       case R.id.my_add:  
         findViewById(android.R.id.empty).setVisibility(View.GONE);  
         addItem(spinnerArray,0,0);  
         return true;  
     }  
     return super.onOptionsItemSelected(item);  
   }  
   @Override  
   public void onBackPressed() {  
     if (mContainerView.getChildCount() > 0) {  
       showAlert();  
     } else {  
       super.onBackPressed();  
     }  
   }  
   public void readPhone(){  
     findViewById(android.R.id.empty).setVisibility(View.GONE);  
     int[] pNumber = new int[]{  
         88800011, 88800012, 88800013, 88800014  
     };  
     int[] pos = new int[]{  
         1, 3, 2, 0  
     };  
     for(int i =0;i<pNumber.length; i++){  
       addItem(spinnerArray,pos[i],pNumber[i]);  
     }  
   }  
   private void addItem(List<String> ss, int pos, int num) {  
     final ViewGroup newView = (ViewGroup) LayoutInflater.from(this).inflate(  
         R.layout.row, mContainerView, false);  
     dataAdapter =new ArrayAdapter<String>(newView.getContext(),R.layout.support_simple_spinner_dropdown_item,ss);  
     EditText f = (EditText) newView.findViewById(R.id.text1123);  
     if(num == 0)  
       f.setText(" ");  
     else  
       f.setText("" + num);  
     f.setId(f.generateViewId());  
     f.requestFocus();  
     Spinner spin = (Spinner) newView.findViewById(R.id.spinner1123);  
     spin.setAdapter(dataAdapter);  
     spin.setId(spin.generateViewId());  
     spin.setSelection(pos);  
     mContainerView.addView(newView,0);  
     newView.findViewById(R.id.delete_button).setOnClickListener(new View.OnClickListener() {  
       @Override  
       public void onClick(View view) {  
         mContainerView.removeView(newView);  
         if (mContainerView.getChildCount() == 0) {  
           findViewById(android.R.id.empty).setVisibility(View.VISIBLE);  
         }  
       }  
     });  
   }  
   private void showAlert() {  
     AlertDialog.Builder alert = new AlertDialog.Builder(this);  
     alert.setMessage("Өөрчлөлтийг хадгалах уу?");  
     List<View> vl = getAllChildren(mContainerView);  
     String v = " ";  
     String vv = " ";  
     for(int i=0; i<vl.size(); i++) {  
       if (vl.get(i) instanceof EditText) {  
         v = v + "-" + (((EditText)vl.get(i)).getText()) + ", " ;  
       }  
       if (vl.get(i) instanceof Spinner) {  
         v = v + " " + ((Spinner)vl.get(i)).getSelectedItem().toString();  
       }  
     }  
     final TextView input = new TextView(this);  
     input.setText(v);  
     alert.setView(input);  
     alert.setPositiveButton("Хадгалах", new DialogInterface.OnClickListener() {  
       public void onClick(DialogInterface dialog, int whichButton) {  
         Toast.makeText(getApplicationContext(), "Хадгаллаа ", Toast.LENGTH_SHORT).show();  
         //finish();  
       }  
     });  
     alert.setNegativeButton("Болих", new DialogInterface.OnClickListener() {  
       public void onClick(DialogInterface dialog, int whichButton) {  
         Toast.makeText(getApplicationContext(), "Болив ", Toast.LENGTH_SHORT).show();  
         //finish();  
       }  
     });  
     AlertDialog dialog = alert.create();  
     dialog.show();  
   }  
   private ArrayList<View> getAllChildren(View v) {  
     if (!(v instanceof ViewGroup)) {  
       ArrayList<View> viewArrayList = new ArrayList<View>();  
       viewArrayList.add(v);  
       return viewArrayList;  
     }  
     ArrayList<View> result = new ArrayList<View>();  
     ViewGroup viewGroup = (ViewGroup) v;  
     for (int i = 0; i < viewGroup.getChildCount(); i++) {  
       View child = viewGroup.getChildAt(i);  
       ArrayList<View> viewArrayList = new ArrayList<View>();  
       viewArrayList.add(v);  
       viewArrayList.addAll(getAllChildren(child));  
       result.addAll(viewArrayList);  
     }  
     return result;  
   }  
 }