Leaderboard.java

package com.test.leaderboard;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;

import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

import org.json.JSONArray;

import java.lang.reflect.Type;
import java.util.List;

public class Leaderboard extends AppCompatActivity {
    private ListView listView;
    private ProgressBar progressBar;
    private TextView scoreText;
    private TextView errorText;
    private List<ScoreEntry> entries;
    private LeaderboardAdapter adapter;

    private ScoreEntry userEntry;

    MediaPlayer applausePlayer;
    MediaPlayer booPlayer;

    VolleySingleton volley;
    AlertDialog dialog;

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

        listView = (ListView) findViewById(R.id.listView);
        progressBar = (ProgressBar) findViewById(R.id.progress);
        scoreText = (TextView) findViewById(R.id.text_score);
        errorText = (TextView) findViewById(R.id.text_error);

        volley = VolleySingleton.getInstance(Leaderboard.this);
        getLeaderboardData();

        Bundle bundle = getIntent().getExtras();
        String username = bundle.getString("username");
        int score = bundle.getInt("score");

        applausePlayer = MediaPlayer.create(Leaderboard.this, R.raw.applause);
        booPlayer = MediaPlayer.create(Leaderboard.this, R.raw.boo);

        userEntry = new ScoreEntry(username, score);
        scoreText.setText(Integer.toString(userEntry.getScore()));

        AlertDialog.Builder builder = new AlertDialog.Builder(Leaderboard.this);
        builder.setMessage("Are you sure you wanat to quit?")
                .setTitle("Exit")
                .setPositiveButton("Exit", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Leaderboard.this.finish();
                    }
                })
                .setNegativeButton("Retry", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Intent newGame = new Intent(Leaderboard.this, MainActivity.class);
                        startActivity(newGame);
                        Leaderboard.this.finish();
                    }
                });

        dialog = builder.create();
    }

    private void getLeaderboardData() {
        String url = getString(R.string.url_leaderboard);
        JsonArrayRequest request = new JsonArrayRequest(
                Request.Method.GET,
                url,
                null,
                new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        progressBar.setVisibility(View.GONE);
                        parseResponse(response);
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        progressBar.setVisibility(View.GONE);
                        errorText.setVisibility(View.VISIBLE);
                    }
                });

        volley.addToRequestQueue(request);
    }

    /**
     * Parse the JSON response and display in the listView
     *
     * @param response
     */
    private void parseResponse(JSONArray response) {
        String jsonStr = response.toString();
        Type listType = new TypeToken<List<ScoreEntry>>() {
        }.getType();

        Gson gson = new Gson();
        entries = gson.fromJson(jsonStr, listType);
        adapter = new LeaderboardAdapter(Leaderboard.this, entries);

        // Check if user's score is in top 10
        boolean found = false;
        for (ScoreEntry entry : entries) {
            if (entry.equals(userEntry)) {
                found = true;
                break;
            }
        }

        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                listView.setAdapter(adapter);
            }
        });

        if (found) {
            applausePlayer.start();
        } else {
            booPlayer.start();
        }
    }

    @Override
    protected void onStop() {
        super.onStop();

        // release resources and tidy up
        if (applausePlayer != null) {
            applausePlayer.release();
            applausePlayer = null;
        }

        if (booPlayer != null) {
            booPlayer.release();
            booPlayer = null;
        }
    }

    @Override
    public void onBackPressed() {
        dialog.show();
    }
}