1.  "Edit Text" form Text Fields
2.  "Button" from Form Widgets
3.  "Text View" from Form Widgets

You will get this

Let us do few modifications do Get This to look better.
In Edit Text add

android:hint="Enter Text Here"

Change the Text

"Button" to "Click me"

In TextView Add

android:textSize="25dp"
android:textColor="#000"
android:background="#fff"
android:hint="Output Is Displayed here"

 

Open src >> vee.sample.demo >> MyFirstProjectActivity.java

package vee.sample.demo;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MyFirstProjectActivity extends Activity {

 // Declaration Starts here
 // we have added 3 objects EditText, Button, TextView

 EditText e;
 Button b;
 TextView t;

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

  // Connecting Objects in xml to declared Variables

  e = (EditText) findViewById(R.id.editText1); // Edittext should be
              // connected to Edittext
              // only
  b = (Button) findViewById(R.id.button1);
  t = (TextView) findViewById(R.id.textView2); // Output Should be
              // displayed below
              // Button, it's id is
              // android:id="@+id/textView2"

  // On clicking the Button, fetch the values entered in Edittext
  // Store in temp string
  // display in TextView

  // type "b.seton" & Hit Ctrl+Space, then type "new" hit Ctrl+Space
  // u will get the below easily

  b.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    // Function Goes here

    // Fetch the Values from EditText
    String temp = e.getText().toString();

    // set temp values to TextView

    t.setText(temp);

   }
  });

 }
}