When i want to navigate one activity page to another page my app is crashed in android

Question

This is my MainActivity file

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import com.example.abvica.ui.login.LoginActivity
import kotlinx.android.synthetic.main.activity_login2.*
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    Button1.setOnClickListener {
        val intent = Intent(this,login::class.java)
        startActivity(intent)
      }
    }
}

this is AndroidManifest File

   <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/AppTheme">
     <activity android:name=".login"></activity>
     <activity android:name=".Verify_otp" />
     <activity
        android:name=".ui.login.LoginActivity"
        android:label="@string/title_activity_login" />
     <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
     </activity>
   </application>

Activity_main.xml

 <androidx.constraintlayout.widget.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"
     tools:context=".MainActivity">

  <TextView
    android:id="@+id/textView1"
    android:layout_width="369dp"
    android:layout_height="41dp"
    android:layout_marginStart="5dp"
    android:layout_marginLeft="42dp"
    android:fontFamily="sans-serif-condensed-light"
    android:text=" Welcome To App"
    android:textColor="#3888f1"
    android:textStyle="bold"
    android:textSize="30sp"
    android:typeface="normal"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.297"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.023" />

<TextView
    android:id="@+id/textView2"
    android:layout_width="369dp"
    android:layout_height="41dp"
    android:layout_marginStart="28dp"
    android:layout_marginLeft="42dp"
    android:layout_below="@+id/textView1"
    android:fontFamily="sans-serif-condensed-light"
    android:text="Oyyaah! Your account has been varified.
                  Please update your details and password"
    android:textColor="#000"
    android:textSize="18sp"
    android:typeface="normal"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.111" />

<ImageView
    android:id="@+id/imageView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:srcCompat="@drawable/welcome"
    tools:ignore="MissingConstraints"
    tools:layout_editor_absoluteX="0dp"
    tools:layout_editor_absoluteY="0dp" />

<TextView
    android:id="@+id/textView3"
    android:layout_width="369dp"
    android:layout_height="41dp"
    android:layout_marginStart="32dp"
    android:layout_marginLeft="42dp"
    android:fontFamily="sans-serif-condensed-light"
    android:text="Enter Name"
    android:textColor="#000"
    android:textSize="18sp"
    android:typeface="normal"
    android:layout_below="@+id/imageView"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.813" />

<EditText
    android:id="@+id/editText5"
    style="@style/Widget.AppCompat.EditText"
    android:layout_width="260dp"
    android:layout_height="41dp"
    android:layout_above="@+id/Button1"
    android:layout_below="@id/textView3"
    android:layout_alignBottom="@id/textView3"
    android:layout_alignParentBottom="true"
    android:layout_gravity="center"
    android:layout_marginTop="600dp"
    android:layout_marginLeft="47dp"
    app:layout_constraintVertical_bias="0.813"
    android:ems="10"
    android:background="@drawable/custom_input"
    android:inputType="textPersonName|text"
    android:singleLine="false"
    android:hint="@string/type_your_name"
    android:paddingLeft="15dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    tools:ignore="MissingConstraints" />

<Button
    android:id="@+id/Button1"
    android:layout_width="200dp"
    android:layout_height="wrap_content"
    android:layout_below="@+id/editText5"
    android:layout_marginBottom="16dp"
    android:background="#3888f1"
    android:gravity="center|center_horizontal|center_vertical"
    android:text="Get Started"
    android:textColor="#fff"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.497"
    app:layout_constraintStart_toStartOf="parent"
    tools:ignore="MissingConstraints" />

</androidx.constraintlayout.widget.ConstraintLayout

This is my code for button please help am new in android. This is my files and their code please tell me where I am going wrong. This is my main activity. I want to connect .login activity with main page please help

check two things 1) `Button1` nullability 2) make sure you have added both the activity to Manifest file out of one should have ` — chand mohd, Aug 21 '20 at 10:58
Please add the content of `activity_main.xml` to your question. Edit the question and copy the layout file in there. — David Wasser, Aug 21 '20 at 21:04
Please also add the crash (exception) with stack trace from the logcat. This will help pinpoint your problem. — David Wasser, Aug 21 '20 at 21:07

score 1 · Answer 1 · answered Aug 21 '20 at 11:24

1

Looks like you haven't initialized the button. Initialize the button with findViewById(R.id.buttonId);

answered Aug 21 '20 at 11:24

G Ganesh

103
7

But after searching lot's of tutorials i didn't found to initialized this anywhere in kotlin – Mahak Garg Aug 21 '20 at 11:39
val button = findViewById – G Ganesh Aug 21 '20 at 11:41
In Kotlin it is not necessary to use `findViewById()`. You can refer to the `View` directly by it's ID. I'm guessing that you aren't doing this correctly. – David Wasser Aug 21 '20 at 21:05

score 0 · Answer 2 · answered Aug 21 '20 at 16:12

Seems you a tring to call the wrong activity.

You have declared 2 other activities in Manifest, this:

<activity android:name=".login"></activity>

and this:

<activity
    android:name=".ui.login.LoginActivity"
    android:label="@string/title_activity_login" />

The button listener calls this intent:

val intent = Intent(this,login::class.java)

Maybe you implemented .ui.login.LoginActivity and is tring to call the wrong one (.login) Try this insted:

val intent = Intent(this,LoginActivity::class.java)

When i want to navigate one activity page to another page my app is crashed in android

2 Answers2