android bella: الانتقال بين الصفحات في الاندرويد ونقل البيانات android studio

<relativelayout android:layout_height="match_parent" android:layout_width="match_parent" tools:context="com.learnmore.androidbella.ScrollLayout" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools">
  
    <linearlayout android:layout_height="match_parent" android:layout_width="match_parent" android:orientation="vertical">
  
        <edittext android:ems="10" android:id="@+id/editText" android:inputtype="textEmailAddress" android:layout_alignparentend="true" android:layout_alignparentright="true" android:layout_alignparenttop="true" android:layout_height="wrap_content" android:layout_marginend="212dp" android:layout_marginright="212dp" android:layout_width="wrap_content"/>
  
        <edittext android:id="@+id/editText2" android:layout_height="wrap_content" android:layout_width="150dp"/>
  
        <button android:id="@+id/button2" android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="New Button"/>
    </linearlayout>
</relativelayout>

package com.learnmore.androidbella;
 
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
 
public class mainIn extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_in);
        final EditText Et=(EditText) findViewById(R.id.editText);
        final EditText Et1=(EditText) findViewById(R.id.editText2);
        Button bun=(Button)findViewById(R.id.button2);
        bun.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                 String eit =Et.getText().toString();
                 String eit1 =Et1.getText().toString();
                Intent purp1=new Intent(getApplicationContext(),MainActivity.class);
                Bundle bu2=new Bundle();
                bu2.putString("Et",eit);
                bu2.putString("Et1",eit1);
                purp1.putExtras(bu2);
                startActivity(purp1);
            }
        });
    }
}

package com.learnmore.androidbella;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
 
public class MainActivity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Bundle mo = getIntent().getExtras();
        String res = mo.getString("eit");
        String res1 = mo.getString("eit1");
        TextView near=(TextView) findViewById(R.id.textView2);
        near.setText("name : "+res+" password "+res1);
    }
}