Android app that randomly awards score to paired opponents based on score point and comments out the winner after 20 plays

GoalChallenge_MainActivitity.java

package com.example.android.goalchallenge;

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

// This is an example of an implementation of inheritance
public class MainActivity extends AppCompatActivity {
//Variables to hold global data that will be accessed by methods
    int scorePoint[] = {4, 2, 1};
    String team[] = {"A", "B"};
    int teamScoreA = 0;
    int teamScoreB = 0;
    int playCount = 0;

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

    /* This method randomly selects a team to award score and stops execution at full time*/
    public void play(View view) {
	String result = "";
        if (playCount == 21) {
					//Notify player that the challenge is over
            Toast.makeText(this, "Game over!", Toast.LENGTH_SHORT).show();
					//Statement to display winner on the challenge at full time
            if (teamScoreA > teamScoreB) {
                result = "Peeeeee!!!\nChelsea won the goal challenge";
                displayResult(result);
                return;
            } else if (teamScoreA == teamScoreB) {
                result = "Peeeeee!!!\nThe goal challenge was a tie";
                displayResult(result);
                return;
            } else {
                result = "Peeeeee!!!\nLiverpool won the goal challenge";
                displayResult(result);
                return;
            }
        }
        playCount += 1;
        int goalType = scorePoint[(int) Math.floor(Math.random() * 3)];
        String teamSupply = team[(int) Math.floor(Math.random() * 2)];
			//statement to identify the type of goal scored and provides the appropriate commentary
        switch (teamSupply) {
            case "A":
                teamScoreA += scorePoint[(int) Math.floor(Math.random() * 3)];
                displayScoreA(teamScoreA);
                switch (goalType) {
                    case 4:
                        Toast.makeText(this, "Chelsea score from a free kick", Toast.LENGTH_SHORT).show();
                        break;
                    case 2:
                        Toast.makeText(this, "Chelsea score In play", Toast.LENGTH_SHORT).show();
                        break;
                    case 1:
                        Toast.makeText(this, "Chelsea score from a penalty", Toast.LENGTH_SHORT).show();
                        break;
                }
                break;

            case "B":
                teamScoreB += scorePoint[(int) Math.floor(Math.random() * 3)];
                displayScoreB(teamScoreB);
                switch (goalType) {
                    case 4:
                        Toast.makeText(this, "Liverpool score from a free kick", Toast.LENGTH_SHORT).show();
                        break;
                    case 2:
                        Toast.makeText(this, "Liverpool score In play", Toast.LENGTH_SHORT).show();
                        break;
                    case 1:
                        Toast.makeText(this, "Liverpool score from a penalty", Toast.LENGTH_SHORT).show();
                        break;
                }
                break;
        }
    }

    /* This method resets all team scores and full time result */
    public void restart(View view) {
        teamScoreB = 0;
        teamScoreA = 0;
        playCount = 0;
        String result = "";
        displayScoreB(teamScoreB);
        displayScoreA(teamScoreA);
        displayResult(result);
    }

    /* This method displays the current score on screen for teamA */
    public void displayScore(int num) {
        TextView score_text_view = (TextView) findViewById(R.id.score_boardA);
        score_text_view.setText(String.valueOf(num));
    }

    /* This method displays the current score on screen for any other Team passed as second param (TeamB).
	This is an example of method overloading */
    public void displayScore(int num, String team_board) {
        TextView score_text_view = (TextView) findViewById(team_board);
        score_text_view.setText(String.valueOf(num));
    }

    /* This method displays the full time result on screen */
    public void displayResult(String message) {
        TextView score_text_view = (TextView) findViewById(R.id.result_text_view);
        score_text_view.setText(message);
    }
}