Enhanced Snake Game

Enhanced_MainActivity.java

package com.mjuaji.snake1720;


import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.Rect;
import android.os.Bundle;
import android.view.Display;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

import com.google.android.gms.games.Games;

public class MainActivity extends BaseGameActivity implements View.OnClickListener {
    Button llPlay;
    Button awardsLink;
    com.google.android.gms.common.SignInButton sign_in_button;
    Button sign_out_button;

    Canvas canvas;
    SnakeAnimView snakeAnimView;
    //snake head sprite sheet
    Bitmap headAnimBitmap;
    //The portion of the bitmap to be drawn in the current frame
    Rect rectToBeDrawn;
    int frameHeight = 64;
    int frameWidth = 64;
    int numFrames = 6;
    int frameNumber;

    int screenWidth;
    int screenHeight;

    //stats
    long lastFrameTime;
    int fps;
    int hi;

    //start the game from on touch event
    Intent i;

    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        //find out the width and height of the Screen
        Display display = getWindowManager().getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        screenWidth = size.x;
        screenHeight = size.y;
        headAnimBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.head_sprite_sheet);
        snakeAnimView = new SnakeAnimView(this);
        setContentView(snakeAnimView);

        //load out UI on top of the SnakeAnimView
        LayoutInflater mInflater = LayoutInflater.from(this);
        View overView = mInflater.inflate(R.layout.activity_main, null);
        this.addContentView(overView, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

        //game services button
        sign_in_button = (com.google.android.gms.common.SignInButton) findViewById(R.id.sign_in_button);
        sign_in_button.setOnClickListener(this);

        sign_out_button = (Button) findViewById(R.id.sign_out_button);
        sign_out_button.setOnClickListener(this);

        awardsLink = (Button) findViewById(R.id.awardsLink);
        awardsLink.setOnClickListener(this);

        llPlay = (Button) findViewById(R.id.llPlay);
        llPlay.setOnClickListener(this);

        i = new Intent(this, GameActivity.class);
    }

    @Override
    public void onSignInFailed() {
        //sign in failed. so show the sign-in button
        sign_in_button.setVisibility(View.VISIBLE);
        sign_out_button.setVisibility(View.GONE);
    }

    @Override
    public void onSignInSucceeded() {
        //show sign-out button, hide the sign-in button
        sign_in_button.setVisibility(View.GONE);
        sign_out_button.setVisibility(View.VISIBLE);
        llPlay.setVisibility(View.VISIBLE);
        awardsLink.setVisibility(View.VISIBLE);
    }

    @Override
    public void onClick(View view) {
        switch(view.getId()){
            case R.id.sign_in_button:
                //start the sign
                beginUserInitiatedSignIn(); //implemented for us in BaseGameActivity
                break;

            case R.id.sign_out_button:
                //sign out
                signOut();//implemented for us in BaseGameActivity

                //show sign-in button, hide the sign-out button
                sign_in_button.setVisibility(View.VISIBLE);
                sign_out_button.setVisibility(View.GONE);
                llPlay.setVisibility(View.GONE);
                awardsLink.setVisibility(View.GONE);
                beginUserInitiatedSignIn();
                break;

            case R.id.awardsLink:
                startActivityForResult(Games.Achievements.getAchievementsIntent(getApiClient()),0);
                break;

            case R.id.llPlay:
                startActivityForResult(Games.Leaderboards.getLeaderboardIntent(getApiClient(),getResources().getString(R.string.leaderboard_snake)),0);
                break;
        }

    }

    class SnakeAnimView extends SurfaceView implements Runnable{
        Thread ourThread = null;
        SurfaceHolder ourHolder;
        volatile boolean playingSnake;
        Paint paint;

        public SnakeAnimView(Context context){
            super(context);
            ourHolder = getHolder();
            paint = new Paint();
            frameWidth = headAnimBitmap.getWidth()/numFrames;
            frameHeight = headAnimBitmap.getHeight();
        }

        @Override
        public void run(){
            while(playingSnake){
                update();
                draw();
                controlFPS();
            }
        }

        public void update(){
            //which frame should we draw
            rectToBeDrawn = new Rect((frameNumber*frameWidth)-1, 0, (frameNumber*frameWidth+frameWidth)-1,frameHeight);
            //now the next frame
            frameNumber++;
            //dont try and draw frames that dont exist
            if(frameNumber == numFrames){
                frameNumber = 0; //back to the first frame
            }
        }

        public void draw(){
            if(ourHolder.getSurface().isValid()){
                canvas = ourHolder.lockCanvas();
                //the background
                canvas.drawColor(Color.BLACK);
                paint.setColor(Color.argb(255,255,255,255));
                paint.setTextSize(150);

                canvas.drawText("Snake",10,150,paint);
                paint.setTextSize(25);
                canvas.drawText(" Hi score: " + hi, 10, screenHeight - 50, paint);

                //draw the snake head make this Rect whatever size and location you like(startX, startY, endX, endY)
                Rect destRect = new Rect(screenWidth/2 - 100, screenHeight/2-100, screenWidth/2+100, screenHeight/2+100);

                canvas.drawBitmap(headAnimBitmap, rectToBeDrawn, destRect, paint);
                ourHolder.unlockCanvasAndPost(canvas);
            }
        }

        public void controlFPS(){
            long timeThisFrame = (System.currentTimeMillis() - lastFrameTime);
            long timeToSleep = 500 - timeThisFrame;
            if(timeThisFrame > 0){
                fps = (int)(1000/timeThisFrame);
            }
            if(timeToSleep > 0){
                try{
                    ourThread.sleep(timeToSleep);
                }catch(InterruptedException e){

                }
            }
            lastFrameTime = System.currentTimeMillis();
        }


        public void pause(){
            playingSnake = false;
            try{
                ourThread.join();
            }catch(InterruptedException e){

            }
        }

        public void resume(){
            playingSnake = true;
            ourThread = new Thread(this);
            ourThread.start();
        }

        @Override
        public boolean onTouchEvent(MotionEvent motionEvent){
            startActivity(i);
            return true;
        }
    }
    @Override
    protected void onStop(){
        super.onStop();
        while(true){
            snakeAnimView.pause();
            break;
        }
        finish();
    }

    @Override
    protected void onResume(){
        super.onResume();
        snakeAnimView.resume();
    }

    @Override
    protected void onPause(){
        super.onPause();
        snakeAnimView.pause();
    }

    public boolean onKeyDown(int keyCode, KeyEvent event){
        if(keyCode == KeyEvent.KEYCODE_BACK){
            snakeAnimView.pause();
            finish();
            return true;
        }
        return false;
    }

}