Create an application that will pass two number using TextView to the next screen, and on the next screen display sum of that number.

Activity_main.xml

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

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".MainActivity" >

    <EditText

        android:id="@+id/editText1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignBaseline="@+id/textView1"

        android:layout_alignBottom="@+id/textView1"

        android:layout_marginLeft="28dp"

        android:layout_toRightOf="@+id/textView1"

        android:ems="10"

        android:inputType="text"

        >

        <requestFocus />

    </EditText>

    <EditText

        android:id="@+id/editText2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/editText1"

        android:layout_alignTop="@+id/textView2"

        android:ems="10"

        android:inputType="text"

        />

    <TextView

        android:id="@+id/textView2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/editText1"

        android:layout_marginTop="44dp"

        android:layout_toLeftOf="@+id/editText1"

        android:text="@string/value2" />

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/editText2"

        android:layout_marginTop="54dp"

        android:layout_toRightOf="@+id/textView2"

        android:text="@string/Submit" />

    <TextView

        android:id="@+id/textView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true"

        android:layout_marginLeft="20dp"

        android:layout_marginTop="34dp"

        android:text="@string/value1" />

</RelativeLayout>

Activity_main_act2.xml

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

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".MainActivity2" >

    <TextView

        android:id="@+id/textView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true"

        android:layout_marginLeft="17dp"

        android:layout_marginTop="48dp"

        android:text="@string/value1" />

    <TextView

        android:id="@+id/textView2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/textView1"

        android:layout_below="@+id/textView1"

        android:layout_marginTop="26dp"

        android:text="@string/value2" />

    <TextView

        android:id="@+id/textView3"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/textView2"

        android:layout_below="@+id/textView2"

        android:layout_marginLeft="36dp"

        android:layout_marginTop="77dp"

        android:text="@string/add" />

</RelativeLayout>

MainActivity.java

package com.example.p11;

import android.os.Bundle;

import android.app.Activity;

import android.content.Intent;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

public class MainActivity extends Activity implements OnClickListener {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Button btn=(Button)findViewById(R.id.button1);

        btn.setOnClickListener(this);

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.activity_main, menu);

        return true;

    }

                                                        @Override

                                                        public void onClick(View arg0) {

                                                            // TODO Auto-generated method stub

                                                        Intent i=new Intent(this,MainActivity2.class);

                                                        EditText t1=(EditText)findViewById(R.id.editText1);

                                                        EditText t2=(EditText)findViewById(R.id.editText2);

                                                            String s1=t1.getText().toString();

                                                            String s2=t2.getText().toString();

                                                            i.putExtra("value1", s1);

                                                            i.putExtra("value2", s2);

                                                            startActivity(i);

                                                       

                                                        }

   

}

MainActivity2.java

package com.example.p11;

import android.os.Bundle;

import android.app.Activity;

import android.content.Intent;

import android.view.Menu;

import android.widget.TextView;

public class MainActivity2 extends Activity {

                                                        @Override

                                                        protected void onCreate(Bundle savedInstanceState) {

                                                            super.onCreate(savedInstanceState);

                                                            setContentView(R.layout.activity_main_act2);

                                                           

                                                            Intent i=getIntent();

                                                            String s1=i.getStringExtra("value1");

TextView value1=(TextView)findViewById(R.id.textView1);

                                                            value1.setText("Value 1: "+s1);

                                                           

                                                            String s2=i.getStringExtra("value2");

TextView value2=(TextView)findViewById(R.id.textView2);                  

                                                            value2.setText("Value 2: "+s2);

                                                        final int val1=Integer.parseInt(s1);

                                                        final int val2=Integer.parseInt(s2);

                                                        int sum=val1+val2;

                             TextView add=(TextView)findViewById(R.id.textView3);

                             add.setText("Addition of two values is:  "+Integer.toString(sum));

                                                        }

                                                        @Override

        public boolean onCreateOptionsMenu(Menu menu) getMenuInflater().inflate(R.menu.activity_main_act2, menu);

                                                            return true;

                                                        }

}