Code For Court Counter App

<?xml version="1.0" encoding="utf-8"?>
<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">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:orientation="vertical"
            tools:context="com.example.android.courtcounter.MainActivity">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="15dp"
                android:fontFamily="sans-serif-medium"
                android:gravity="center_horizontal"
                android:padding="5dp"
                android:text="Team A"
                android:textColor="#616161"
                android:textSize="15sp" />

            <TextView
                android:id="@+id/text_a_score"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="15dp"
                android:fontFamily="sans-serif-light"
                android:gravity="center_horizontal"
                android:padding="5dp"
                android:text="0"
                android:textColor="#000000"
                android:textSize="55sp" />

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="8dp"
                android:layout_marginLeft="24dp"
                android:layout_marginRight="24dp"
                android:layout_marginTop="25dp"
                android:onClick="addScoreThree"
                android:text="+3 Points" />

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="8dp"
                android:layout_marginLeft="24dp"
                android:layout_marginRight="24dp"
                android:layout_marginTop="7dp"
                android:onClick="addScoreTwo"
                android:text="+2 Points" />

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="8dp"
                android:layout_marginLeft="24dp"
                android:layout_marginRight="24dp"
                android:layout_marginTop="7dp"
                android:onClick="addScoreOne"
                android:text="Free Throw" />

        </LinearLayout>

        <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:layout_marginTop="15dp"
                android:fontFamily="sans-serif-medium"
                android:gravity="center_horizontal"
                android:padding="5dp"
                android:text="Team B"
                android:textColor="#616161"
                android:textSize="15sp" />

            <TextView
                android:id="@+id/text_b_score"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="15dp"
                android:fontFamily="sans-serif-light"
                android:gravity="center_horizontal"
                android:padding="5dp"
                android:text="0"
                android:textColor="#000000"
                android:textSize="55sp" />

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="8dp"
                android:layout_marginLeft="24dp"
                android:layout_marginRight="24dp"
                android:layout_marginTop="25dp"
                android:onClick="addScoreThreeTeamB"
                android:text="+3 Points" />

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="8dp"
                android:layout_marginLeft="24dp"
                android:layout_marginRight="24dp"
                android:layout_marginTop="7dp"
                android:onClick="addScoreTwoTeamB"
                android:text="+2 Points" />

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="8dp"
                android:layout_marginLeft="24dp"
                android:layout_marginRight="24dp"
                android:layout_marginTop="7dp"
                android:onClick="addScoreOneTeamB"
                android:text="Free Throw" />


        </LinearLayout>

    </LinearLayout>

    <Button
        android:id="@+id/button5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="30dp"
        android:onClick="resetScore"
        android:text="Reset" />

    <View
        android:layout_width="1dp"
        android:layout_height="320dp"
        android:background="@android:color/background_dark"
        android:layout_marginTop="30dp"
        android:id="@+id/view"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true">

    </View>

</RelativeLayout>

java code for court counter App

package com.example.android.courtcounter;

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

public class MainActivity extends AppCompatActivity {
int scoreTeamA = 0;
int scoreTeamB = 0;

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

}

//display when the +3 Points Button clicked//

public void addScoreThree(View view){
     scoreTeamA = scoreTeamA +3;
    displayForTeamA(scoreTeamA);
}


//display when the +3 Points Button clicked//

public void addScoreTwo(View view){
    scoreTeamA = scoreTeamA +2;
    displayForTeamA(scoreTeamA);
}


//display when the +1 Points Button clicked//

public void addScoreOne(View view){
    scoreTeamA = scoreTeamA +1;
    displayForTeamA(scoreTeamA);

}

//display when the +3 Points Button clicked//

public void addScoreThreeTeamB(View view){
    scoreTeamB = scoreTeamB +3;
    displayForTeamB(scoreTeamB);
}


//display when the +3 Points Button clicked//

public void addScoreTwoTeamB(View view){
    scoreTeamB = scoreTeamB +2;
    displayForTeamB(scoreTeamB);
}


//display when the +1 Points Button clicked//

public void addScoreOneTeamB(View view){
    scoreTeamB = scoreTeamB +1;
    displayForTeamB(scoreTeamB);

}

public void resetScore(View view){
    scoreTeamA = 0;
    scoreTeamB = 0;
    displayForTeamA(scoreTeamA);
    displayForTeamB(scoreTeamB);
}

//When Button iS Clicked shows Team A Score
public void displayForTeamA(int score){
    TextView scoreView = (TextView) findViewById(R.id.text_a_score);
    scoreView.setText(String.valueOf(score));
}

//When Button iS Clicked shows Team b Score
public void displayForTeamB(int score){
    TextView scoreView = (TextView) findViewById(R.id.text_b_score);
    scoreView.setText(String.valueOf(score));
}

}