First commit

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

app/.gitignore

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+/build

app/build.gradle

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+plugins {
+    id 'com.android.application'
+}
+
+android {
+    compileSdk 31
+
+    defaultConfig {
+        applicationId "com.example.workflow"
+        minSdk 16
+        targetSdk 31
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.appcompat:appcompat:1.3.1'
+    implementation 'com.google.android.material:material:1.4.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.1'
+    testImplementation 'junit:junit:4.+'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/androidTest/java/com/example/workflow/ExampleInstrumentedTest.java

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+package com.example.workflow;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("com.example.workflow", appContext.getPackageName());
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.workflow">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.WorkFlow">
+        <activity
+            android:name=".Profile"
+            android:exported="false" />
+        <activity
+            android:name=".HomeActivity"
+            android:exported="false" />
+        <activity
+            android:name=".Register"
+            android:exported="false" />
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/com/example/workflow/DbHandler.java

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+package com.example.workflow;
+
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+
+import androidx.annotation.Nullable;
+
+public class DbHandler extends SQLiteOpenHelper {
+    public static final String DBNAME = "Login.db";
+
+    public DbHandler(Context context) {
+        super(context, "Login.db", null, 1);
+    }
+
+
+    @Override
+    public void onCreate(SQLiteDatabase MyDB) {
+        MyDB.execSQL("CREATE TABLE employee (emp_id Integer Primary Key Autoincrement, first_name Text, Surname Text, Username Text, Password Text)");
+    }
+
+    @Override
+    public void onUpgrade(SQLiteDatabase MyDB, int oldVersion, int newVersion) {
+        MyDB.execSQL("Drop Table if exists employee");
+    }
+
+    public Boolean addEmployee(String Fname, String Sname, String Uname, String Pword){
+        SQLiteDatabase MyDB = this.getWritableDatabase();
+        ContentValues values = new ContentValues();
+        values.put("first_name", Fname);
+        values.put("Surname", Sname);
+        values.put("Username", Uname);
+        values.put("Password", Pword);
+        long result = MyDB.insert("employee", null, values);
+            if(result==-1) return false;
+            else return true;
+    }
+    public Boolean checkusername(String username){
+        SQLiteDatabase MyDB = this.getReadableDatabase();
+        Cursor cursor = MyDB.rawQuery("Select * from employee where username = ?", new String[]{username});
+        if(cursor.getCount()>0)
+            return false;
+        else
+            return true;
+    }
+    public Boolean checkuserpass(String username,String Pass){
+        SQLiteDatabase MyDB = this.getReadableDatabase();
+        Cursor cursor = MyDB.rawQuery("Select * from employee where Username = ? and Password =?", new String[]{username,Pass});
+        if(cursor.getCount()>0)
+            return true;
+        else
+            return false;
+
+    }
+//    public String getName(String username){
+//        SQLiteDatabase MyDB = this.getReadableDatabase();
+//        Cursor cursor = MyDB.rawQuery("Select first_name from employee where Username = ?" , new String[]{username});
+//        final int nameIndex = cursor.getColumnIndex("first_name");
+//        String name;
+//        do {
+//                name = cursor.getString(nameIndex);
+//        }while(cursor.moveToNext());
+//        return name;
+//    }
+
+}

app/src/main/java/com/example/workflow/HomeActivity.java

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+package com.example.workflow;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.TextView;
+
+public class HomeActivity extends AppCompatActivity {
+    TextView textView,profile;
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_home);
+        textView = findViewById(R.id.textView3);
+        profile = findViewById(R.id.profile);
+        Intent intent=getIntent();
+        String s=intent.getStringExtra(MainActivity.Extra_NAME);
+        textView.setText("Welcome "+s);
+        profile.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Intent intent = new Intent(HomeActivity.this,Profile.class);
+                startActivity(intent);
+            }
+        });
+    }
+}

app/src/main/java/com/example/workflow/MainActivity.java

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+package com.example.workflow;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.AutoCompleteTextView;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.Toast;
+
+public class MainActivity extends AppCompatActivity {
+    public static final String Extra_NAME="com.example.workflow.extra.NAME";
+    Button login,register;
+    EditText pass ;
+    AutoCompleteTextView user;
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        login = findViewById(R.id.login);
+        user = findViewById(R.id.Username);
+        pass = findViewById(R.id.editTextPass);
+        register = findViewById(R.id.register);
+        DbHandler db=new DbHandler(this);
+        register.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Intent intent= new Intent(getApplicationContext(),Register.class);
+                startActivity(intent);
+            }
+        });
+        login.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                String username= user.getText().toString();
+                String password= pass.getText().toString();
+                if(username.equals("")||password.equals(""))
+                    Toast.makeText(MainActivity.this, "* All fields are mandatory", Toast.LENGTH_SHORT).show();
+                else{
+                    if(db.checkusername(username))
+                        Toast.makeText(MainActivity.this, "User doesn't exist! Please register", Toast.LENGTH_SHORT).show();
+                    else if(db.checkuserpass(username,password)){
+                        Toast.makeText(MainActivity.this, "Logged in successfully", Toast.LENGTH_SHORT).show();
+                        Intent intent=new Intent(getApplicationContext(),HomeActivity.class);
+                        intent.putExtra(Extra_NAME,username);
+                        startActivity(intent);
+                    }
+                    else
+                        Toast.makeText(MainActivity.this, "Invalid Credentials", Toast.LENGTH_SHORT).show();
+                }
+            }
+        });
+    }
+}

app/src/main/java/com/example/workflow/Profile.java

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+package com.example.workflow;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.os.Bundle;
+
+public class Profile extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_profile);
+    }
+}