Android: Box2D--简单的跑跳游戏模型

package akai.game.monkey.run; import akai.game.CommonScene; import akai.game.monkey.run.scene.GameScene; import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.os.Bundle; import android.os.Handler; import android.view.MotionEvent; import android.view.SurfaceHolder; import android.view.SurfaceView; public class MainActivity extends Activity { /**the width and height of screen*/ public static float gScreenW, gScreenH; /**the global world time step*/ public static final float g_STEP_TIME = 1f/60f; /**the handler of view going*/ private Handler mHandler; /**the view*/ private MainView mMainView; /**game state*/ public static final int GAME_STATE_RUNNING = 1, GAME_STATE_PAUSE = 2, GAME_STATE_OVER = 3; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); gScreenW = getWindowManager().getDefaultDisplay().getWidth(); gScreenH = getWindowManager().getDefaultDisplay().getHeight(); mHandler = new Handler(); mMainView = new MainView(this); setContentView(mMainView); } @Override protected void onResume() { super.onResume(); mHandler.post(mMainView); } @Override protected void onPause() { super.onPause(); mHandler.removeCallbacks(mMainView); } /** * * @author K * */ public class MainView extends SurfaceView implements SurfaceHolder.Callback, Runnable{ private SurfaceHolder mSurfaceHolder; private Canvas mCanvas; private Context mContext; // private CommonScene mScene; /**test now*/ //private CommonScene mSceneBg; public MainView(Context context) { super(context); mContext = context; setKeepScreenOn(true); setFocusable(true); setFocusableInTouchMode(true); mSurfaceHolder = getHolder(); mSurfaceHolder.addCallback(this); //create scene mScene = new GameScene(mContext); //init data of the view mScene.create(); // mSceneBg.create(); } @Override public void surfaceCreated(SurfaceHolder holder) { //start handler mHandler.postDelayed(this, (long) (g_STEP_TIME*1000)); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } @Override public void surfaceDestroyed(SurfaceHolder holder) { mHandler.removeCallbacks(this); } /** * every is running here */ @Override public void run() { long start, end; start = System.currentTimeMillis(); mScene.step();//go to next step if(mScene instanceof GameScene) { GameScene gs = (GameScene)mScene; if(gs.getmGameState() == MainActivity.GAME_STATE_OVER) { return;//the world stop } } //mSceneBg.step(); try{ mCanvas = mSurfaceHolder.lockCanvas(); mCanvas.drawColor(Color.BLACK);/**need to draw bg image*/ mScene.draw(mCanvas); // mSceneBg.draw(mCanvas); mSurfaceHolder.unlockCanvasAndPost(mCanvas); }catch(Exception e){ e.printStackTrace(); } end = System.currentTimeMillis(); if(end - start < 0)System.out.println("end-start:" + (end-start));//for test mHandler.postDelayed(this, (long) (g_STEP_TIME*1000) - (end - start)); } @Override public boolean onTouchEvent(MotionEvent event) { mScene.onTouchEvent(event); return true; } } }