人生的第一个Android游戏诞生

所需的基本知识：

使用SurfaceView类创建游戏场景，游戏场景实现Runnable接口，并使用线程刷新游戏画布

如何解决不同物体的刷新频率？

由于画布是统一刷新的（暂时不知道如何实现局部刷新画布），例如A要0.1秒刷新一次画布，而B要1秒刷新一次画布，那么就在场景中引入计时器timer，每次刷新线程计时器递增，让线程休眠100毫秒，通过对计时器求模运算（如timer%20就是2秒刷新频率）

核心代码：

package com.example.testgame;import android.app.AlertDialog;import android.content.Context;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.media.AudioManager;import android.media.MediaPlayer;import android.media.SoundPool;import android.security.KeyStoreParameter.Builder;import android.view.MotionEvent;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;public class gameView extends SurfaceView implements Callback, Runnable {private SurfaceHolder sfh;private Thread thread;private boolean flag;private int[][] grid = {{ 0, 0, 0, 0, 0 },{ 0, 0, 0, 0, 0 },{ 0, 0, 0, 0, 0 },{ 0, 0, 0, 0, 0 },{ 0, 0, 0, 0, 0 },{ 0, 0, 0, 0, 0 },{ 0, 0, 0, 0, 0 }};private int ROWS, COLS;int BLK_WIDTH, BLK_HEIGHT;private int mouseX, mouseY;private int getX, getY;private boolean touched;private int timer = 1;private int score = 0;private SoundPool clickSound, startSound;private int soundId, startSoundId;private Bitmap[] bmpBtn = new Bitmap[2];private Bitmap bmpBg, bmpScoreBoard, map;private boolean pressed = false;private boolean startGame = false;private MediaPlayer mp, end;private Bitmap mouse;private int count_down;public gameView(Context context) {super(context);// TODO 自动生成的构造函数存根sfh = this.getHolder();sfh.addCallback(this);flag = true;BLK_WIDTH = 100;BLK_HEIGHT = 100;ROWS = 7;COLS = 5;touched = false;clickSound = new SoundPool(4, AudioManager.STREAM_MUSIC, 100);startSound = new SoundPool(4, AudioManager.STREAM_MUSIC, 100);soundId = clickSound.load(getContext(), R.raw.click, 1);startSoundId = startSound.load(getContext(), R.raw.start_sound, 100);bmpBtn[0] = BitmapFactory.decodeResource(getResources(), R.raw.btn_1);bmpBtn[1] = BitmapFactory.decodeResource(getResources(), R.raw.btn_2);bmpBg = BitmapFactory.decodeResource(getResources(), R.raw.bg);mouse = BitmapFactory.decodeResource(getResources(), R.raw.mouse);map = BitmapFactory.decodeResource(getResources(), R.raw.map);bmpScoreBoard = BitmapFactory.decodeResource(getResources(), R.raw.score_board);mp = MediaPlayer.create(getContext(), R.raw.bg_music);end = MediaPlayer.create(getContext(), R.raw.end);mp.setLooping(true);count_down = 60;}@Overridepublic void run() {// TODO 自动生成的方法存根while (flag) {timer++;gameDraw();if (timer % 15 == 0) {logic();}if (timer % 10 == 0) {count_down--;}if (count_down < 0) {// System.out.println("GAME OVER");flag = false;mp.stop();scoreBoard();}try {Thread.sleep(100);} catch (InterruptedException e) {// TODO 自动生成的 catch 块e.printStackTrace();}}}@Overridepublic void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {// TODO 自动生成的方法存根}@Overridepublic void surfaceCreated(SurfaceHolder arg0) {// TODO 自动生成的方法存根gameInit();// thread = new Thread(this);// thread.start();}public boolean containsPoint(int x, int y, Bitmap bitmap, Point point) {if (point.x > x && point.x < x + bitmap.getWidth() && point.y > y & point.y < y + bitmap.getHeight()) {return true;} else {return false;}}@Overridepublic void surfaceDestroyed(SurfaceHolder arg0) {// TODO 自动生成的方法存根flag = false;}public void logic() {for (int i = 0; i < grid.length; i++) {for (int j = 0; j < grid[0].length; j++) {grid[i][j] = 0;}}int jump_count = (int) (Math.random() * 4 + 2);// System.out.println(jump_count);long start = System.currentTimeMillis();for (int i = 0; i < jump_count; i++) {int x = (int) (Math.random() * ROWS);int y = (int) (Math.random() * COLS);grid[x][y] = 1;}}@Overridepublic boolean onTouchEvent(MotionEvent event) {// TODO 自动生成的方法存根if (event.getAction() == MotionEvent.ACTION_DOWN) {mouseX = (int) event.getX();mouseY = (int) event.getY();pressed = true;if (mouseX <= BLK_WIDTH * COLS && mouseY < BLK_HEIGHT * ROWS) {getX = mouseX / BLK_WIDTH;getY = mouseY / BLK_HEIGHT;// System.out.println(grid[getY][getX] + "");// System.out.println(getX + ", " + getY);if (grid[getY][getX] == 1) {// System.out.println("CAUGHTED...");score++;grid[getY][getX] = 0;clickSound.play(soundId, 1, 1, 0, 0, 1);}}} else if (event.getAction() == MotionEvent.ACTION_UP) {// gameInit();pressed = false;}if (!startGame) {gameInit();}return true;}public void gameDraw() {Canvas canvas = sfh.lockCanvas();Paint paint = new Paint();canvas.drawColor(Color.GREEN);canvas.drawBitmap(map, 0, 0, null);// 边框// paint.setColor(Color.GRAY);// paint.setStyle(Paint.Style.STROKE);for (int i = 0; i < grid.length; i++) {for (int j = 0; j < grid[0].length; j++) {paint.setStyle(Paint.Style.FILL);if (grid[i][j] == 0) {// 填充// paint.setColor(Color.WHITE);} else if (grid[i][j] == 1) {// 填充// paint.setColor(Color.BLACK);canvas.drawBitmap(mouse, j * BLK_WIDTH, i * BLK_HEIGHT, null);}// paint.setColor(Color.BLACK);// canvas.drawRect(j * BLK_WIDTH, i * BLK_HEIGHT, (j + 1) *// BLK_WIDTH, (i + 1) * BLK_HEIGHT, paint);// 边框// paint.setColor(Color.GRAY);// paint.setStyle(Paint.Style.STROKE);// canvas.drawRect(j * BLK_WIDTH, i * BLK_HEIGHT, (j + 1) *// BLK_WIDTH, (i + 1) * BLK_HEIGHT, paint);}}Paint scorePaint = new Paint();scorePaint.setColor(Color.RED);scorePaint.setTextSize(80);Paint countdownPaint = new Paint();countdownPaint.setColor(Color.WHITE);countdownPaint.setTextSize(40);if (score != 0) {canvas.drawText(score + "", this.getWidth() / 2 - 40, BLK_HEIGHT * ROWS + 100, scorePaint);}canvas.drawText(count_down + "", this.getWidth() - 60, 40, countdownPaint);sfh.unlockCanvasAndPost(canvas);}public void gameInit() {Paint paintBlue = new Paint();paintBlue.setColor(Color.BLUE);Paint paintWhite = new Paint();paintWhite.setColor(Color.WHITE);Canvas canvas = sfh.lockCanvas();// canvas.drawColor(Color.WHITE);canvas.drawBitmap(bmpBg, 0, 0, null);// // canvas.drawRect(100, 100, 200, 200, paintBlue);int x = this.getWidth() / 2 - bmpBtn[0].getWidth() / 2;int y = this.getHeight() / 2 - bmpBtn[0].getHeight() / 2;if (containsPoint(x, y, bmpBtn[0], new Point(mouseX, mouseY)) && pressed) {canvas.drawBitmap(bmpBtn[1], x, y, null);startGame = true;startSound.play(startSoundId, 1, 1, 0, 0, 1);} else {canvas.drawBitmap(bmpBtn[0], x, y, null);}if (startGame) {// try {// Thread.sleep(1000);// } catch (InterruptedException e) {// // TODO 自动生成的 catch 块// e.printStackTrace();// }if (flag) {thread = new Thread(this);thread.start();mp.start();}}paintWhite.setTextSize(20);canvas.drawText("Start Game", x + bmpBtn[0].getWidth() / 2 - 50, y + bmpBtn[0].getHeight() / 2 + 4, paintWhite);sfh.unlockCanvasAndPost(canvas);}public void scoreBoard() {Canvas canvas = sfh.lockCanvas();Paint scorePaint = new Paint();scorePaint.setColor(Color.RED);scorePaint.setTextSize(100);canvas.save();canvas.scale((float) this.getWidth() / (float) bmpScoreBoard.getWidth(), (float) this.getHeight() / (float) bmpScoreBoard.getHeight());canvas.drawBitmap(bmpScoreBoard, 0, 0, null);canvas.restore();canvas.drawText(score + "", 70, 260, scorePaint);sfh.unlockCanvasAndPost(canvas);end.start();}public void startGame() {flag = true;}}

源文件下载：

HitTheRat