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"
    android:background="@drawable/lol">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true">

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:orientation="vertical">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:fontFamily="sans-serif-medium"
                android:gravity="center"
                android:padding="16dp"
                android:text="YOU"
                android:textColor="#FFFFFF"
                android:textSize="14sp" />

            <TextView
                android:id="@+id/my_score"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:fontFamily="sans-serif-light"
                android:gravity="center"
                android:paddingBottom="24dp"
                android:text="0"
                android:textColor="#000000"
                android:textSize="56sp" />

            <Button
                android:id="@+id/pentakill"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="8dp"
                android:layout_marginLeft="24dp"
                android:layout_marginRight="24dp"
                android:onClick="addFiveKillsForYOU"
                android:text="Penta Kill" />

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="8dp"
                android:layout_marginLeft="24dp"
                android:layout_marginRight="24dp"
                android:onClick="addFourKillsForYOU"
                android:text="Quadra KIll" />

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="8dp"
                android:layout_marginLeft="24dp"
                android:layout_marginRight="24dp"
                android:onClick="addThreeKillsForYOU"
                android:text="Triple Kill" />
            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="8dp"
                android:layout_marginLeft="24dp"
                android:layout_marginRight="24dp"
                android:onClick="addTwoKillsForYOU"
                android:text="Double KILL" />
            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="8dp"
                android:layout_marginLeft="24dp"
                android:layout_marginRight="24dp"
                android:onClick="addOneKillForYOU"
                android:text="1 KILL " />
        </LinearLayout>

        <View
            android:layout_width="2dp"
            android:layout_height="match_parent"
            android:layout_marginTop="16dp"
            android:background="#F44336" />

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="vertical">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:fontFamily="sans-serif-medium"
                android:gravity="center"
                android:padding="16dp"
                android:text="YOUR FRIEND"
                android:textColor="#FFFFFF"
                android:textSize="14sp" />

            <TextView
                android:id="@+id/your_friend"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:fontFamily="sans-serif-light"
                android:gravity="center"
                android:paddingBottom="24dp"
                android:text="0"
                android:textColor="#000000"
                android:textSize="56sp" />

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="8dp"
                android:layout_marginLeft="24dp"
                android:layout_marginRight="24dp"
                android:onClick="addFiveKillsForYOURFriend"
                android:text="PENTA KILL" />

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="8dp"
                android:layout_marginLeft="22dp"
                android:layout_marginRight="22dp"
                android:onClick="addFourKillsForYOURFriend"
                android:text="QUADRA KILL" />

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="8dp"
                android:layout_marginLeft="22dp"
                android:layout_marginRight="22dp"
                android:onClick="addThreeKillsForYOURFriend"
                android:text="TRIPLE KILL" />
            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="8dp"
                android:layout_marginLeft="24dp"
                android:layout_marginRight="24dp"
                android:onClick="addTwoKillsForYOURFriend"
                android:text="Double KILL" />
            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="8dp"
                android:layout_marginLeft="24dp"
                android:layout_marginRight="24dp"
                android:onClick="addOneKillForYOURFriend"
                android:text="1 KILL " />
        </LinearLayout>
    </LinearLayout>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="32dp"
        android:onClick="resetScore"
        android:text="Reset" />

</RelativeLayout>

Android.Manifest.xml

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

    <application
        android:largeHeap="true"
        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>
    </application>

</manifest>

colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#3F51B5</color>
    <color name="colorPrimaryDark">#303F9F</color>
    <color name="colorAccent">#FF4081</color>
</resources>

MainActivity.java

package com.example.android.league;

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

public class MainActivity extends AppCompatActivity {
    int yourscore  = 0;
    int yourfriendsscore = 0;


    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);




        }


    public void addFiveKillsForYOU(View v) {
        yourscore = yourscore+ 5;
        displayYou(yourscore);
    }


    public void addFourKillsForYOU(View v) {
        yourscore = yourscore+ 4;
        displayYou(yourscore);}

    public void addThreeKillsForYOU(View v) {
        yourscore = yourscore+ 3;
        displayYou(yourscore);}

    public void addTwoKillsForYOU(View v) {
        yourscore = yourscore+ 2;
        displayYou(yourscore);}


    public void addOneKillForYOU(View v) {
        yourscore = yourscore+ 1;
        displayYou(yourscore);}



    public void addFiveKillsForYOURFriend(View v) {
        yourfriendsscore = yourfriendsscore+ 5;
        displayHim(yourfriendsscore);}


    public void addFourKillsForYOURFriend(View v) {
        yourfriendsscore = yourfriendsscore+ 4;
        displayHim(yourfriendsscore);}


    public void addThreeKillsForYOURFriend(View v) {
        yourfriendsscore = yourfriendsscore+ 3;
        displayHim(yourfriendsscore);}


    public void addTwoKillsForYOURFriend(View v) {
        yourfriendsscore = yourfriendsscore+ 2;
        displayHim(yourfriendsscore);}


    public void addOneKillForYOURFriend(View v) {
        yourfriendsscore = yourfriendsscore+ 1;
        displayHim(yourfriendsscore);}

    public void displayHim(int yourfriendsscore) {
        TextView yourfriendsscoreView = (TextView) findViewById(R.id.your_friend);
        yourfriendsscoreView.setText(String.valueOf(yourfriendsscore));}
    public void displayYou(int yourscore) {
        TextView yourscoreView = (TextView) findViewById(R.id.my_score);
        yourscoreView.setText(String.valueOf(yourscore));}

    public void  resetScore(View v) {
        int yourscore  = 0;
        int yourfriendsscore = 0;
        displayYou(yourscore);
        displayHim(yourfriendsscore);

        }
}

styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">#F44336</item>
        <item name="colorPrimaryDark">#F44336</item>
        <item name="colorAccent">#F44336</item>
        <item name="colorButtonNormal">#F44336</item>
    </style>

</resources>