You forgot to set setContentView()

You should set like this:

setContentView(binding.getRoot());

This should work perfectly.

hare your SignUpActivity you forgot to set ContentView. that’s why your screen is blank. You need to do something like this

public class SignUpActivity extends AppCompatActivity {

    ActivitySignUpBinding binding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = ActivitySignUpBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());
    }
}

I am building a Chatting App and I am stuck at Sign Up because when I run my application, it shows a blank screen.

By the way, I am using binding.

And when I use this code:

public class SignUpActivity extends AppCompatActivity {

    ActivitySignUpBinding binding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = ActivitySignUpBinding.inflate(getLayoutInflater());
        binding.getRoot();
    }
}

It shows a blank screen.

And when I use this code:

public class SignUpActivity extends AppCompatActivity {

    ActivitySignUpBinding binding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sign_up);
    }
}

It shows an error that: NewAge Chat keeps stopping.

activity_sign_up.xml code:

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout 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=".SignUpActivity"
        android_orientation="vertical"
        android_background="@drawable/w1"
        android_gravity="center">

    <ImageView
        android_layout_height="100dp"
        android_layout_width="100dp"
        android_id="@+id/logo"
        android_src="@drawable/ic_launcher_favicon"/>

    <EditText
        android_id="@+id/txtUsername"
        android_layout_width="match_parent"
        android_layout_height="wrap_content"
        android_hint="Username"
        android_textColor="@color/white"
        android_textColorHint="@color/chatbackground"
        android_layout_marginTop="15dp"
        android_layout_marginBottom="10dp"
        android_ems="10"
        android_inputType="textPersonName"
        android_padding="9dp"
        android_textSize="20sp"/>

    <EditText
        android_id="@+id/txtEmail"
        android_layout_width="match_parent"
        android_layout_height="wrap_content"
        android_hint="Email"
        android_textColor="@color/white"
        android_textColorHint="@color/chatbackground"
        android_layout_marginBottom="10dp"
        android_ems="10"
        android_inputType="textEmailAddress"
        android_padding="9dp"
        android_textSize="20sp"/>

    <EditText
        android_id="@+id/txtPassword"
        android_layout_width="match_parent"
        android_layout_height="wrap_content"
        android_hint="Password"
        android_textColor="@color/white"
        android_textColorHint="@color/chatbackground"
        android_layout_marginBottom="10dp"
        android_ems="10"
        android_inputType="textPassword"
        android_padding="9dp"
        android_textSize="20sp"/>

    <TextView
        android_layout_width="wrap_content"
        android_layout_height="wrap_content"
        android_id="@+id/alreadyHaveAccount"
        android_layout_gravity="right"
        android_text="Already Have An Account"
        android_textColor="@color/white"
        android_textStyle="bold"
        android_textSize="18sp"/>

    <Button
        android_layout_width="150dp"
        android_layout_height="70dp"
        android_text="Sign Up"
        android_textSize="20sp"
        android_textAllCaps="false"
        android_id="@+id/btnSignUp"/>

    <LinearLayout
        android_layout_width="match_parent"
        android_layout_height="wrap_content"
        android_gravity="center">
        <Button
            android_layout_width="170dp"
            android_layout_height="70dp"
            android_id="@+id/btnGoogle"
            android_text="Google"
            android_textAllCaps="false"
            android_backgroundTint="@color/white"
            android_textColor="@color/black"
            android_textSize="20sp"
            android_paddingTop="5dp"
            android_paddingBottom="7dp"
            android_paddingLeft="20dp"
            android_paddingRight="20dp"
            android_layout_marginRight="40sp"/>

        <Button
            android_layout_width="170dp"
            android_layout_height="70dp"
            android_id="@+id/btnFacebook"
            android_text="Facebook"
            android_textAllCaps="false"
            android_backgroundTint="@color/fb_color"
            android_textColor="@color/black"
            android_textSize="20sp"
            android_paddingTop="5dp"
            android_paddingBottom="7dp"
            android_paddingLeft="20dp"
            android_paddingRight="20dp"/>
    </LinearLayout>

    <TextView
        android_layout_width="wrap_content"
        android_layout_height="wrap_content"
        android_id="@+id/signUpPhone"
        android_text="Sign Up with Phone"
        android_textSize="25sp"
        android_textColor="@color/white"
        android_paddingTop="25dp"
        android_textStyle="bold"/>

</LinearLayout>

SignUpActivity.java code:

package com.agrim.newagechat;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;

import com.agrim.newagechat.databinding.ActivitySignUpBinding;

public class SignUpActivity extends AppCompatActivity {

    ActivitySignUpBinding binding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = ActivitySignUpBinding.inflate(getLayoutInflater());
        binding.getRoot();

        getSupportActionBar().hide();

        binding.alreadyHaveAccount.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(SignUpActivity.this, SignInActivity.class);
                startActivity(intent);
            }
        });
    }
}

AndroidManifest.xml code:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns_android="http://schemas.android.com/apk/res/android"
    xmlns_tools="http://schemas.android.com/tools"
    package="com.agrim.newagechat">

    <application
        android_allowBackup="true"
        android_dataExtractionRules="@xml/data_extraction_rules"
        android_fullBackupContent="@xml/backup_rules"
        android_icon="@drawable/ic_launcher_favicon"
        android_label="@string/app_name"
        android_roundIcon="@drawable/ic_launcher_favicon"
        android_supportsRtl="true"
        android_theme="@style/Theme.NewAgeChat"
        tools_targetApi="31">
        <activity
            android_name=".SignUpActivity"
            android_exported="true">
            <intent-filter>
                <action android_name="android.intent.action.MAIN" />

                <category android_name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android_name=".MainActivity"
            android_exported="false"/>
    </application>

</manifest>

I have setted the <intent-filter></intent-filter> also…