Activity transition/intent

// activity_main.xml

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:weightSum="1"
    android:background="#aaaaaa"
    android:orientation="vertical"
    tools:context="com.example.i310_54.myapplication01.MainActivity">

        <Button
            android:id="@+id/button"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="next PAGE"
            android:onClick="f1"
      />

<EditText
    android:id="@+id/editText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:inputType="textPersonName"
    android:text="Name" />


       </LinearLayout>

// MainActivity.java
 
package com.example.i310_54.myapplication01;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.DataSetObserver;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.RadioGroup;
import android.widget.Spinner;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

public class MainActivity extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }


    public void f1(View view) {
    
        Intent intent=new Intent(getApplicationContext(),AppleActivity.class);
        EditText editText=findViewById(R.id.editText);
 
        intent.putExtra("eun",editText.getText().toString());
           startActivity(intent);


    }
}
// activity_apple.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:weightSum="1"
    android:background="#aaaaaa"
    android:orientation="horizontal"
    tools:context="com.example.i310_54.myapplication01.AppleActivity">


       

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button" />

        <Button
            android:id="@+id/button3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="previous"
            android:onClick="f1"
            />
</LinearLayout>
 
 
// AppleActivity.java
 
package com.example.i310_54.myapplication01;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;

public class AppleActivity extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_apple);
Button button=findViewById(R.id.button2);
Intent intent=intent.getIntent();
String n=intent.getStringExtra("eun");
button.setText(n);



    }

    public void f1(View view){
    finish();
    }


}
// AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.i310_54.myapplication01">

    <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=".AppleActivity"
            android:label="My Application02"
            android:theme="@style/AppTheme">

        </activity>
    </application>

</manifest>