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Logcat:

 2019-01-15 01:36:04.587 24940-24940/com.example.harshitgokharu.attendancemanager D/AndroidRuntime: Shutting down VM

2019-01-15 01:36:04.588 24940-24940/com.example.harshitgokharu.attendancemanager E/AndroidRuntime: FATAL EXCEPTION: main

    Process: com.example.harshitgokharu.attendancemanager, PID: 24940

    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.harshitgokharu.attendancemanager/com.example.harshitgokharu.attendancemanager.MainActivity}: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.harshitgokharu.attendancemanager/com.example.harshitgokharu.attendancemanager.SecondActivity}; have you declared this activity in your AndroidManifest.xml?

        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)

        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)

        at android.app.ActivityThread.-wrap12(ActivityThread.java)

        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)

        at android.os.Handler.dispatchMessage(Handler.java:102)

        at android.os.Looper.loop(Looper.java:154)

        at android.app.ActivityThread.main(ActivityThread.java:6077)

        at java.lang.reflect.Method.invoke(Native Method)

        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)

        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)

     Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.harshitgokharu.attendancemanager/com.example.harshitgokharu.attendancemanager.SecondActivity}; have you declared this activity in your AndroidManifest.xml?

        at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1805)

        at android.app.Instrumentation.execStartActivity(Instrumentation.java:1523)

        at android.app.Activity.startActivityForResult(Activity.java:4224)

        at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:767)

        at android.app.Activity.startActivityForResult(Activity.java:4183)

        at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:754)

        at android.app.Activity.startActivity(Activity.java:4507)

        at android.app.Activity.startActivity(Activity.java:4475)

        at com.example.harshitgokharu.attendancemanager.MainActivity.onCreate(MainActivity.java:64)

        at android.app.Activity.performCreate(Activity.java:6662)

        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)

        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599)

        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707) 

        at android.app.ActivityThread.-wrap12(ActivityThread.java) 

        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460) 

        at android.os.Handler.dispatchMessage(Handler.java:102) 

        at android.os.Looper.loop(Looper.java:154) 

        at android.app.ActivityThread.main(ActivityThread.java:6077) 

        at java.lang.reflect.Method.invoke(Native Method) 

        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866) 

        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756) 

2019-01-15 01:36:04.845 1619-3731/system_process I/OpenGLRenderer: Initialized EGL, version 1.4

2019-01-15 01:36:04.845 1619-3731/system_process D/OpenGLRenderer: Swap behavior 1

2019-01-15 01:36:04.846 1619-3731/system_process W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...

2019-01-15 01:36:04.846 1619-3731/system_process D/OpenGLRenderer: Swap behavior 0

2019-01-15 01:36:04.859 1619-3731/system_process D/EGL_emulation: eglCreateContext: 0x9ba8ac60: maj 2 min 0 rcv 2

2019-01-15 01:36:04.895 1619-3731/system_process D/EGL_emulation: eglMakeCurrent: 0x9ba8ac60: ver 2 0 (tinfo 0x8c6b8eb0)

2019-01-15 01:36:04.979 1619-3731/system_process D/EGL_emulation: eglMakeCurrent: 0x9ba8ac60: ver 2 0 (tinfo 0x8c6b8eb0)

2019-01-15 01:36:05.095 1619-1633/system_process W/ActivityManager: Activity pause timeout for ActivityRecord{156e97 u0 com.example.harshitgokharu.attendancemanager/.MainActivity t191 f}

2019-01-15 01:36:05.143 1619-1633/system_process I/WindowManager: Failed to capture screenshot of Token{9c4884 ActivityRecord{156e97 u0 com.example.harshitgokharu.attendancemanager/.MainActivity t191 f}} appWin=Window{c721825 u0 Starting com.example.harshitgokharu.attendancemanager} drawState=4

2019-01-15 01:36:05.254 1619-1695/system_process W/art: Long monitor contention with owner ActivityManager (1633) at void com.android.server.am.ActivityStack$ActivityStackHandler.handleMessage(android.os.Message)(ActivityStack.java:371) waiters=0 in void com.android.server.am.TaskPersister$LazyTaskWriterThread.run() for 157ms

2019-01-15 01:36:05.403 2107-2291/com.android.launcher3 D/EGL_emulation: eglMakeCurrent: 0x9bac3c80: ver 2 0 (tinfo 0x9d85df40)

2019-01-15 01:36:05.689 1619-1640/system_process I/WindowManager: Destroying surface Surface(name=Starting com.example.harshitgokharu.attendancemanager) called by com.android.server.wm.WindowStateAnimator.destroySurface:2016 com.android.server.wm.WindowStateAnimator.destroySurfaceLocked:882 com.android.server.wm.WindowState.removeLocked:1456 com.android.server.wm.WindowManagerService.removeWindowInnerLocked:2484 com.android.server.wm.AppWindowToken.destroySurfaces:365 com.android.server.wm.WindowStateAnimator.finishExit:565 com.android.server.wm.AppWindowAnimator.stepAnimationLocked:427 com.android.server.wm.WindowAnimator.updateAppWindowsLocked:176 

2019-01-15 01:36:05.783 1619-1640/system_process W/WindowManager: Failed looking up window

    java.lang.IllegalArgumentException: Requested window android.view.ViewRootImpl$W@a62241c does not exist

        at com.android.server.wm.WindowManagerService.windowForClientLocked(WindowManagerService.java:9107)

        at com.android.server.wm.WindowManagerService.windowForClientLocked(WindowManagerService.java:9098)

        at com.android.server.wm.WindowManagerService.removeWindow(WindowManagerService.java:2302)

        at com.android.server.wm.Session.remove(Session.java:202)

        at android.view.ViewRootImpl.dispatchDetachedFromWindow(ViewRootImpl.java:3286)

        at android.view.ViewRootImpl.doDie(ViewRootImpl.java:5881)

        at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:3622)

        at android.os.Handler.dispatchMessage(Handler.java:102)

        at android.os.Looper.loop(Looper.java:154)

        at android.os.HandlerThread.run(HandlerThread.java:61)

        at com.android.server.ServiceThread.run(ServiceThread.java:46)

2019-01-15 01:36:05.804 2421-24429/com.google.android.gms I/Icing: Usage reports ok 125, Failed Usage reports 0, indexed 0, rejected 0, imm upload false

2019-01-15 01:36:05.836 2421-24429/com.google.android.gms I/Icing: Usage reports ok 0, Failed Usage reports 0, indexed 0, rejected 0, imm upload false

2019-01-15 01:36:05.854 2421-24429/com.google.android.gms I/Icing: Usage reports ok 0, Failed Usage reports 0, indexed 0, rejected 0, imm upload true

2019-01-15 01:36:05.872 12709-24923/com.google.android.googlequicksearchbox:search I/UpdateIcingCorporaServi: UpdateCorporaTask done [took 4087 ms] updated apps [took 4087 ms] 

2019-01-15 01:36:05.928 2421-2806/com.google.android.gms I/Icing: IndexChimeraService.getServiceInterface callingPackage=com.google.android.gms componentName=AppsCorpus serviceId=36

2019-01-15 01:36:05.933 2421-2722/com.google.android.gms I/Icing: IndexChimeraService.getServiceInterface callingPackage=com.google.android.gms componentName=AppsCorpus serviceId=32

2019-01-15 01:36:05.968 2421-24945/com.google.android.gms I/Icing: Usage reports ok 0, Failed Usage reports 0, indexed 0, rejected 0, imm upload false

2019-01-15 01:36:05.997 2421-24945/com.google.android.gms I/Icing: Usage reports ok 0, Failed Usage reports 0, indexed 0, rejected 0, imm upload false

2019-01-15 01:36:06.918 2421-24945/com.google.android.gms I/Icing: Indexing com.google.android.gms-apps from com.google.android.gms

2019-01-15 01:36:07.011 2421-24945/com.google.android.gms I/Icing: Indexing done com.google.android.gms-apps

2019-01-15 01:36:07.017 2421-24945/com.google.android.gms I/Icing: Indexing com.google.android.googlequicksearchbox-applications_uri from com.google.android.googlequicksearchbox

2019-01-15 01:36:07.130 2421-24945/com.google.android.gms I/Icing: Indexing com.google.android.gms-internal.3p:MobileApplication from com.google.android.gms

2019-01-15 01:36:07.291 2421-24945/com.google.android.gms I/Icing: Indexing done com.google.android.googlequicksearchbox-applications_uri

2019-01-15 01:36:07.301 2421-24945/com.google.android.gms I/Icing: Indexing done com.google.android.gms-internal.3p:MobileApplication

2019-01-15 01:36:07.307 2421-24945/com.google.android.gms I/Icing: Indexing com.google.android.gms-apps from com.google.android.gms

2019-01-15 01:36:07.330 2421-24945/com.google.android.gms I/Icing: Indexing done com.google.android.gms-apps

2019-01-15 01:36:09.040 1619-2227/system_process I/ActivityManager: Killing 24492:com.google.android.talk/u0a53 (adj 906): empty #17

2019-01-15 01:36:09.091 1619-2289/system_process D/ActivityManager: cleanUpApplicationRecord -- 24492

2019-01-15 01:36:11.854 1619-2227/system_process I/ActivityManager: Killing 24531:com.google.android.talk:matchstick/u0a53 (adj 906): empty #17

2019-01-15 01:36:11.875 1619-1851/system_process D/ActivityManager: cleanUpApplicationRecord -- 24531

2019-01-15 01:36:15.573 1619-1633/system_process W/ActivityManager: Activity destroy timeout for ActivityRecord{156e97 u0 com.example.harshitgokharu.attendancemanager/.MainActivity t191 f}

2019-01-15 01:38:40.614 2049-2069/com.google.android.gms.persistent I/art: Background partial concurrent mark sweep GC freed 87854(4MB) AllocSpace objects, 0(0B) LOS objects, 25% free, 11MB/15MB, paused 2.998ms total 176.431ms

2019-01-15 01:40:24.827 1619-1674/system_process D/WifiNative-HAL: Failing getSupportedFeatureset because HAL isn't started

2019-01-15 01:40:24.832 1619-1636/system_process E/BluetoothAdapter: Bluetooth binder is null

2019-01-15 01:40:24.834 1619-1636/system_process E/BatteryStatsService: no controller energy info supplied

2019-01-15 01:40:24.846 1619-1636/system_process E/KernelCpuSpeedReader: Failed to read cpu-freq: /sys/devices/system/cpu/cpu0/cpufreq/stats/time_in_state (No such file or directory)

2019-01-15 01:40:24.847 1619-1636/system_process E/KernelUidCpuTimeReader: Failed to read uid_cputime: /proc/uid_cputime/show_uid_stat (No such file or directory)

2019-01-15 01:40:24.853 1619-1636/system_process E/BatteryStatsService: modem info is invalid: ModemActivityInfo{ mTimestamp=0 mSleepTimeMs=0 mIdleTimeMs=0 mTxTimeMs=[0, 0, 0, 0, 0] mRxTimeMs=0 mEnergyUsed=0}

2019-01-15 01:41:04.614 1619-3175/system_process I/ActivityManager: Killing 24940:com.example.harshitgokharu.attendancemanager/u0a85 (adj 900): crash

2019-01-15 01:41:04.615 1619-3175/system_process D/ActivityManager: cleanUpApplicationRecord -- 24940

2019-01-15 01:41:04.647 1619-3731/system_process D/EGL_emulation: eglMakeCurrent: 0x9ba8ac60: ver 2 0 (tinfo 0x8c6b8eb0)

2019-01-15 01:41:04.666 1619-3407/system_process W/InputMethodManagerService: Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@a030199 attribute=null, token = android.os.BinderProxy@6cc6164

2019-01-15 01:41:04.896 1619-1640/system_process I/WindowManager: Destroying surface Surface(name=Application Error: com.example.harshitgokharu.attendancemanager) called by com.android.server.wm.WindowStateAnimator.destroySurface:2016 com.android.server.wm.WindowStateAnimator.destroySurfaceLocked:882 com.android.server.wm.WindowState.destroyOrSaveSurface:2100 com.android.server.wm.WindowSurfacePlacer.performSurfacePlacementInner:429 com.android.server.wm.WindowSurfacePlacer.performSurfacePlacementLoop:232 com.android.server.wm.WindowSurfacePlacer.performSurfacePlacement:180 com.android.server.wm.WindowManagerService$H.handleMessage:8086 android.os.Handler.dispatchMessage:102 

2019-01-15 01:41:04.897 1619-1640/system_process W/AppOps: Finishing op nesting under-run: uid 1000 pkg android code 24 time=0 duration=0 nesting=0

Java File:

package com.example.harshitgokharu.attendancemanager;



import android.content.Intent;

import android.support.annotation.NonNull;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.support.v7.widget.CardView;

import android.view.View;

import android.widget.EditText;

import android.widget.Toast;



import com.google.android.gms.tasks.OnCompleteListener;

import com.google.android.gms.tasks.Task;

import com.google.firebase.auth.AuthResult;

import com.google.firebase.auth.FirebaseAuth;

import com.google.firebase.auth.FirebaseUser;



public class MainActivity extends AppCompatActivity {

    EditText user;

    EditText pass;

    CardView card;

    FirebaseAuth fire;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);



        user=(EditText)findViewById(R.id.user);

        pass=(EditText)findViewById(R.id.pass);

        card=(CardView)findViewById(R.id.card);



        card.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                if(validate())

                {

                    String user1= user.getText().toString();

                    String pass1= pass.getText().toString();

                    fire.signInWithEmailAndPassword(user1,pass1).addOnCompleteListener(new OnCompleteListener<AuthResult>() {

                        @Override

                        public void onComplete(@NonNull Task<AuthResult> task) {

                            if(task.isSuccessful())

                            {

                                Toast.makeText(MainActivity.this,"Login Successful",Toast.LENGTH_SHORT).show();

                                startActivity(new Intent(MainActivity.this,SecondActivity.class));

                            }

                            else

                            {

                                Toast.makeText(MainActivity.this,"Login Failed",Toast.LENGTH_SHORT).show();

                            }



                        }

                    });

                };

            }

        });



        fire=FirebaseAuth.getInstance();

        FirebaseUser user=fire.getCurrentUser();

        if(user!=null)

        {

            finish();

            startActivity(new Intent(MainActivity.this,SecondActivity.class));

        }









    }

    private Boolean validate()

    {

        Boolean result=false;



        String user1= user.getText().toString();

        String pass1= pass.getText().toString();



        if(user1.isEmpty() || pass1.isEmpty()) {

            Toast.makeText(this,"Please enter all the details",Toast.LENGTH_SHORT).show();

        }

        else

        {

            result=true;

        }



        return result;



    }

}

XML file:

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:background="#E33441  "

    tools:context=".MainActivity">





    <ImageView

        android:id="@+id/logo"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:layout_marginStart="8dp"

        android:layout_marginLeft="8dp"

        android:layout_marginTop="8dp"

        android:layout_marginEnd="8dp"

        android:layout_marginRight="8dp"

        android:layout_marginBottom="8dp"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintHorizontal_bias="0.492"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toTopOf="parent"

        app:layout_constraintVertical_bias="0.203"

        app:srcCompat="@drawable/logo"

        android:contentDescription="@string/todo" />



    <EditText

        android:id="@+id/user"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginStart="8dp"

        android:layout_marginLeft="8dp"

        android:layout_marginTop="8dp"

        android:layout_marginEnd="8dp"

        android:layout_marginRight="8dp"

        android:layout_marginBottom="8dp"

        android:autofillHints=""

        android:background="#E33441  "

        android:drawableStart="@drawable/ic_action_user"

        android:drawableLeft="@drawable/ic_action_user"

        android:ems="10"

        android:hint="@string/user_id"

        android:inputType="textPersonName"

        android:textSize="16sp"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toTopOf="parent"

        tools:targetApi="o" />



    <EditText

        android:id="@+id/pass"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginStart="8dp"

        android:layout_marginLeft="8dp"

        android:layout_marginTop="8dp"

        android:layout_marginEnd="8dp"

        android:layout_marginRight="8dp"

        android:layout_marginBottom="8dp"

        android:background="#E33441  "

        android:drawableStart="@drawable/ic_action_lock"

        android:drawableLeft="@drawable/ic_action_lock"

        android:ems="10"

        android:hint="@string/password"

        android:importantForAutofill="no"

        android:inputType="textPersonName"

        android:textSize="16sp"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toTopOf="parent"

        app:layout_constraintVertical_bias="0.616"

        tools:targetApi="o" />



    <android.support.v7.widget.CardView

        android:id="@+id/card"

        android:layout_width="250dp"

        android:layout_height="50dp"

        android:layout_marginStart="8dp"

        android:layout_marginLeft="8dp"

        android:layout_marginTop="380dp"

        android:layout_marginEnd="8dp"

        android:layout_marginRight="8dp"

        app:cardBackgroundColor="@color/colorPrimary"

        app:cardCornerRadius="25dp"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toTopOf="parent">



        <RelativeLayout

            android:layout_width="match_parent"

            android:layout_height="match_parent">



            <TextView

                android:id="@+id/textView2"

                android:layout_width="68dp"

                android:layout_height="36dp"

                android:layout_alignParentStart="true"

                android:layout_alignParentLeft="true"

                android:layout_alignParentTop="true"

                android:layout_alignParentEnd="true"

                android:layout_alignParentRight="true"

                android:layout_alignParentBottom="true"

                android:layout_marginStart="98dp"

                android:layout_marginLeft="99dp"

                android:layout_marginTop="8dp"

                android:layout_marginEnd="83dp"

                android:layout_marginRight="99dp"

                android:layout_marginBottom="8dp"

                android:text="@string/login"

                android:textColor="#fff"

                android:textSize="25sp" />

        </RelativeLayout>

    </android.support.v7.widget.CardView>



</android.support.constraint.ConstraintLayout>