How to open new activity on click text view? - android-studio

Question

I am very new in application development. I am trying to open new activity when I click on TextView in Android Studio. But i am getting error from android studio which is below
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void
android.view.View.setOnClickListener(android.view.View$OnClickListener)' on a null
object reference at
com.example.etechnomateapp.MainActivity.onCreate(MainActivity.java:41)
The LAYOUT page
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/screenbg"
tools:context=".loginActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10sp"
android:orientation="vertical">
<ImageView
android:id="#+id/img"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="20sp"
android:src="#drawable/shop_logo"
tools:ignore="ContentDescription"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="40sp"
android:layout_marginBottom="40sp"
android:gravity="center_horizontal"
android:text="#string/user_login"
android:textAlignment="center"
android:textAllCaps="true"
android:textColor="#color/colorDarkRed"
android:textSize="22sp"
/>
<com.google.android.material.textfield.TextInputLayout
android:id="#+id/userEmailWreapper"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColorHint="#color/colorRed"
android:layout_marginTop="5dp"
>
<EditText
android:id="#+id/emailAddress"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:layout_marginTop="5dp"
android:inputType="textEmailAddress"
android:hint="#string/enter_email"
android:textColor="#color/colorRed"
android:textSize="18sp"/>
</com.google.android.material.textfield.TextInputLayout>
<com.google.android.material.textfield.TextInputLayout
android:id="#+id/userPasswordWreapper"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColorHint="#color/colorRed"
android:layout_marginTop="5dp"
>
<EditText
android:id="#+id/password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:layout_marginTop="5dp"
android:hint="#string/enter_password"
android:textColor="#color/colorRed"
android:inputType="textPassword"
android:textSize="18sp"/>
</com.google.android.material.textfield.TextInputLayout>
<Button
android:id="#+id/btnLogin"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20sp"
android:text="#string/user_login"
android:background="#drawable/btnloginbg"
android:textColor="#color/colorWhite"
android:textSize="20sp"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10sp"
android:layout_marginBottom="10sp"
android:gravity="center_horizontal"
android:text="Or"
android:textAlignment="center"
android:textAllCaps="true"
android:textColor="#color/colorDarkRed"
android:textSize="22sp"
/>
<TextView
android:id="#+id/forgetPassword"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:text="#string/forgetPass"
android:textAlignment="center"
android:textAllCaps="false"
android:layout_marginLeft="45dp"
android:textColor="#color/colorDarkRed"
android:textSize="16sp"
/>
<TextView
android:id="#+id/UserSignup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:text="#string/signup"
android:textAlignment="center"
android:textAllCaps="false"
android:layout_marginLeft="250dp"
android:layout_marginTop="-20dp"
android:textColor="#color/colorDarkRed"
android:textSize="16sp"
/>
</LinearLayout>
</RelativeLayout>
The Main Acxtivity Page
package com.example.etechnomateapp;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
Button btnUsersignup, btnUserlogin;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnUserlogin=findViewById(R.id.btnUserLogin);
btnUsersignup=findViewById(R.id.btnSignup);
final TextView register = (TextView) findViewById(R.id.UserSignup);
btnUsersignup.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent= new Intent(MainActivity.this, RegistrationActivity.class);
startActivity(intent);
}
});
btnUserlogin.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent= new Intent(MainActivity.this, loginActivity.class);
startActivity(intent);
}
});
register.setOnClickListener(new View.OnClickListener() { /// errors occuring here
#Override
public void onClick(View v) {
Intent myIntent = new Intent(MainActivity.this, RegistrationActivity.class);
startActivity(myIntent);
}
});
}
}

Answer 1

This is a result of activity_main.xml not containing Textview by id UserSignup.
It seems like you have posted some other xml. Because there is no "btnUserLogin" in xml you have written in java code.