<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical" android:layout_width="fill_parent"
 android:layout_height="fill_parent">
 <LinearLayout android:orientation="vertical"
  android:layout_width="fill_parent" android:layout_height="fill_parent"
  android:layout_weight="1">
  <TextView android:text="red" android:gravity="center_horizontal"
   android:background="#aa0000" android:layout_width="fill_parent"
   android:layout_height="fill_parent" android:layout_weight="1" />
  <TextView android:text="green" android:gravity="center_horizontal"
   android:background="#00aa00" android:layout_width="fill_parent"
   android:layout_height="fill_parent" android:layout_weight="1" />
  <TextView android:text="blue" android:gravity="center_horizontal"
   android:background="#0000aa" android:layout_width="fill_parent"
   android:layout_height="fill_parent" android:layout_weight="1" />
  <TextView android:text="yellow" android:gravity="center_horizontal"
   android:background="#aaaa00" android:layout_width="fill_parent"
   android:layout_height="fill_parent" android:layout_weight="1" />
 </LinearLayout>
 <LinearLayout android:orientation="horizontal"
  android:layout_width="fill_parent" android:layout_height="fill_parent"
  android:layout_weight="1">
  <TextView android:text="red" android:gravity="center_horizontal"
   android:background="#aa0000" android:layout_width="wrap_content"
   android:layout_height="fill_parent" android:layout_weight="1" />
  <TextView android:text="green" android:gravity="center_horizontal"
   android:background="#00aa00" android:layout_width="wrap_content"
   android:layout_height="fill_parent" android:layout_weight="1" />
  <TextView android:text="blue" android:gravity="center_horizontal"
   android:background="#0000aa" android:layout_width="wrap_content"
   android:layout_height="fill_parent" android:layout_weight="1" />
  <TextView android:text="yellow" android:gravity="center_horizontal"
   android:background="#aaaa00" android:layout_width="wrap_content"
   android:layout_height="fill_parent" android:layout_weight="1" />
 </LinearLayout>
</LinearLayout>
file Tes2sanActivity.java 
import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
public class Tes2sanActivity extends Activity {
    /** Called when the activity is first created. */
 Button btn;
 @Override
    public void onCreate(Bundle savedInstanceState) {
  
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
 } 
}
hasilnya :