Create activity and go one to another

AndroidMAnifest.xml:

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

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.seam.createactivity5">

    <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">

            <intent-filter>

                <action android:name="com.example.seam.createactivity5.Main2Activity" />

                <category android:name="android.intent.category.DEFAULT" />

            </intent-filter>

        </activity>

    </application>

</manifest>

Main_Activity.xml:

<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"    x

mlns: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="com.example.seam.createactivity_6.MainActivity">

    <Button

        android:id="@+id/button"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Button"

        tools:layout_editor_absoluteX="128dp"

        tools:layout_editor_absoluteY="162dp" />

</android.support.constraint.ConstraintLayout>

MainActivity.java:

package com.example.seam.createactivity_6;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    Button bt;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        stbt();
    }
    public void stbt()
    {
        bt=(Button)findViewById(R.id.button);
        bt.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View v) {
                Intent i=new Intent(getApplicationContext(),Main2Activity.class);
                startActivity(i);
            }
        });
    }
}
Main2Activity.xml:


<?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"

    tools:context="com.example.seam.createactivity_6.Main2Activity">



    <Button

        android:id="@+id/button2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Button2"

        tools:layout_editor_absoluteX="158dp"

        app:layout_constraintTop_toTopOf="parent"

        android:layout_marginTop="185dp"

        app:layout_constraintBottom_toBottomOf="parent"

        android:layout_marginBottom="8dp" />

</android.support.constraint.ConstraintLayout>

Main2Activity.java:
package com.example.seam.createactivity_6;

import android.content.Intent;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.Button;

public class Main2Activity extends Activity {

   Button bt2;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        setBt2();
    }
    public void setBt2()
    {
        bt2=(Button)findViewById(R.id.button2);
        bt2.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View v) {
                Intent ii=new Intent(getApplicationContext(),MainActivity.class);
                startActivity(ii);
            }
        });
    }

}