Android page jump, delay jump, jump transfer value

Project directory: The

manifests main activity tag is placed at the top, and the jump page activity is placed at the back

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.test1">

    <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=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".Main2Activity" />
        <activity android:name=".Main3Activity"></activity>
    </application>

</manifest>

Main2Activity

package com.example.test1;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

public class Main2Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        Bundle bundle=this.getIntent().getExtras();
        String name=bundle.getString("name");
        boolean gent=bundle.getBoolean("gent");
        double size=bundle.getDouble("size");
        Toast.makeText(this, " "+name+" "+gent+" "+size, Toast.LENGTH_SHORT).show();
    }
}

MainActivity

package com.example.test1;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

        findViewById(R.id.btn_jump).setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(MainActivity.this,Main2Activity.class);
                Bundle bundle=new Bundle();
                bundle.putString("name","zzzzz");
                bundle.putBoolean("gent",true);
                bundle.putDouble("size",18.8);
                intent.putExtras(bundle);
                startActivity(intent);
            }
        });

        findViewById(R.id.btn_delay_jump).setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        Intent intent=new Intent(MainActivity.this,Main3Activity.class);
                        startActivity(intent);
                    }
                },2000);
            }
        });
    }
}