Android基础入门小案例+源代码（60个）

package com.bg; import org.jbox2d.collision.AABB; import org.jbox2d.collision.CircleDef; import org.jbox2d.collision.PolygonDef; import org.jbox2d.common.Vec2; import org.jbox2d.dynamics.Body; import org.jbox2d.dynamics.BodyDef; import org.jbox2d.dynamics.ContactListener; import org.jbox2d.dynamics.World; import org.jbox2d.dynamics.contacts.ContactPoint; import org.jbox2d.dynamics.contacts.ContactResult; 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.Paint.Style; import android.util.Log; import android.view.KeyEvent; import android.view.MotionEvent; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.SurfaceHolder.Callback; public class MySurfaceView extends SurfaceView implements Callback, Runnable, ContactListener { private Thread th; private SurfaceHolder sfh; private Canvas canvas; private Paint paint; private boolean flag; // ----添加一个物理世界---->> private final float RATE = 30;// 屏幕到现实世界的比例 30px：1m; private World world;// 声明一个物理世界对象 private AABB aabb;// 声明一个物理世界的范围对象 private Vec2 gravity;// 声明一个重力向量对象 private float timeStep = 1f / 60f;// 物理世界模拟的的频率 private int iterations = 10;// 迭代值，迭代越大模拟越精确，但性能越低 // 声明小球的Body，便于后续对小球进行操作 private Body bodyBall; //声明胜利与失败的body，用于判定游戏的胜负 private Body lostBody1, lostBody2, winBody; // 声明屏幕宽高 private int screenW, screenH; // 声明游戏状态 private final int GAMESTATE_MENU = 0; private final int GAMESTATE_HELP = 1; private final int GAMESTATE_GAMEING = 2; private int gameState = GAMESTATE_MENU; // 为了游戏暂停时，失败，胜利能继续可能到游戏中的状态，所以并没有将其写成一个状态 private boolean gameIsPause, gameIsLost, gameIsWin; // Body图片资源 private Bitmap bmpH, bmpS, bmpSh, bmpSs, bmpBall; // 菜单、按钮、游戏背景图片资源 private Bitmap bmpMenu_help, bmpMenu_play, bmpMenu_exit, bmpMenu_resume, bmpMenu_replay, bmp_menubg, bmp_gamebg, bmpMenuBack, bmp_smallbg, bmpMenu_menu, bmp_helpbg, bmpBody_lost, bmpBody_win, bmpWinbg, bmpLostbg; // 创建按钮 private HButton hbHelp, hbPlay, hbExit, hbResume, hbReplay, hbBack, hbMenu; public MySurfaceView(Context context) { super(context); this.setKeepScreenOn(true); sfh = this.getHolder(); sfh.addCallback(this); paint = new Paint(); paint.setAntiAlias(true); paint.setStyle(Style.STROKE); this.setFocusable(true); this.setFocusableInTouchMode(true); // --添加一个物理世界--->> aabb = new AABB(); gravity = new Vec2(0, 10); aabb.lowerBound.set(-100, -100); aabb.upperBound.set(100, 100); world = new World(aabb, gravity, true); // ---实例化Body图片资源 bmpH = BitmapFactory.decodeResource(getResources(), R.drawable.h); bmpS = BitmapFactory.decodeResource(getResources(), R.drawable.s); bmpSh = BitmapFactory.decodeResource(getResources(), R.drawable.sh); bmpSs = BitmapFactory.decodeResource(getResources(), R.drawable.ss); bmpBall = BitmapFactory.decodeResource(getResources(), R.drawable.ball); // 实例菜单、按钮、游戏背景图片资源 bmpMenu_help = BitmapFactory.decodeResource(getResources(), R.drawable.menu_help); bmpMenu_play = BitmapFactory.decodeResource(getResources(), R.drawable.menu_play); bmpMenu_exit = BitmapFactory.decodeResource(getResources(), R.drawable.menu_exit); bmpMenu_resume = BitmapFactory.decodeResource(getResources(), R.drawable.menu_resume); bmpMenu_replay = BitmapFactory.decodeResource(getResources(), R.drawable.menu_replay); bmp_menubg = BitmapFactory.decodeResource(getResources(), R.drawable.menu_bg); bmp_gamebg = BitmapFactory.decodeResource(getResources(), R.drawable.game_bg); bmpMenuBack = BitmapFactory.decodeResource(getResources(), R.drawable.menu_back); bmp_smallbg = BitmapFactory.decodeResource(getResources(), R.drawable.smallbg); bmpMenu_menu = BitmapFactory.decodeResource(getResources(), R.drawable.menu_menu); bmp_helpbg = BitmapFactory.decodeResource(getResources(), R.drawable.helpbg); bmpBody_lost = BitmapFactory.decodeResource(getResources(), R.drawable.lostbody); bmpBody_win = BitmapFactory.decodeResource(getResources(), R.drawable.winbody); bmpWinbg = BitmapFactory.decodeResource(getResources(), R.drawable.gamewin); bmpLostbg = BitmapFactory.decodeResource(getResources(), R.drawable.gamelost); } //SurfaceView创建 public void surfaceCreated(SurfaceHolder holder) { //防止Home按键导致游戏重置 if (gameState == GAMESTATE_MENU) { screenW = this.getWidth(); screenH = this.getHeight(); // 实例化按钮 hbPlay = new HButton(bmpMenu_play, screenW / 2 - bmpMenu_help.getWidth() / 2, 150); hbHelp = new HButton(bmpMenu_help, hbPlay.getX(), hbPlay.getY() + 50); hbExit = new HButton(bmpMenu_exit, hbPlay.getX(), hbHelp.getY() + 50); hbBack = new HButton(bmpMenuBack, 0, screenH - bmpMenu_help.getHeight()); hbResume = new HButton(bmpMenu_resume, screenW / 2 - bmpMenu_help.getWidth() / 2, 200); hbReplay = new HButton(bmpMenu_replay, hbResume.getX(), hbResume.getY() + 50); hbMenu = new HButton(bmpMenu_menu, hbResume.getX(), hbReplay.getY() + 50); // 创建主角小球 bodyBall = createCircle(bmpBall, bmpH.getHeight(), bmpH.getHeight(), bmpBall.getWidth() / 2, 5); //创建胜负Body lostBody1 = createCircle(bmpBody_lost, screenW - bmpH.getHeight() - bmpBody_lost.getWidth(), bmpH.getHeight(), bmpBody_lost.getWidth() / 2, 0); lostBody2 = createCircle(bmpBody_lost, bmpH.getHeight(), screenH - bmpH.getHeight() - bmpBody_lost.getHeight(), bmpBody_lost.getWidth() / 2, 0); winBody = createCircle(bmpBody_win, screenW - bmpH.getHeight() - bmpBody_win.getWidth(), screenH - bmpH.getHeight() - bmpBody_win.getHeight(), bmpBody_win.getWidth() / 2, 0); //设置传感器，发生碰撞，但无碰撞效果 lostBody1.getShapeList().m_isSensor = true; lostBody2.getShapeList().m_isSensor = true; winBody.getShapeList().m_isSensor = true; // 创建边界 createRect(bmpH, 0, 0, bmpH.getWidth(), bmpH.getHeight(), 0);// 上 createRect(bmpH, 0, getHeight() - bmpH.getHeight(), bmpH.getWidth(), bmpH.getHeight(), 0);// 下 createRect(bmpS, 0, 0, bmpS.getWidth(), bmpS.getHeight(), 0);// 左 createRect(bmpS, getWidth() - bmpS.getWidth(), 0, bmpS.getWidth(), bmpS.getHeight(), 0);// 右 // -----创建障碍物 createRect(bmpSh, 0, 90, bmpSh.getWidth(), bmpSh.getHeight(), 0); createRect(bmpSh, 110, 170, bmpSh.getWidth(), bmpSh.getHeight(), 0); createRect(bmpSs, 110, 170, bmpSs.getWidth(), bmpSs.getHeight(), 0); createRect(bmpSs, getWidth() - 102, screenH - bmpSs.getHeight(), bmpSs.getWidth(), bmpSs.getHeight(), 0); //绑定监听器 world.setContactListener(this); } flag = true; th = new Thread(this); th.start(); } //在物理世界中添加矩形Body public Body createRect(Bitmap bmp, float x, float y, float w, float h, float density) { PolygonDef pd = new PolygonDef(); pd.density = density; pd.friction = 0.8f; pd.restitution = 0.3f; pd.setAsBox(w / 2 / RATE, h / 2 / RATE); BodyDef bd = new BodyDef(); bd.position.set((x + w / 2) / RATE, (y + h / 2) / RATE); Body body = world.createBody(bd); body.m_userData = new MyRect(bmp, x, y); body.createShape(pd); body.setMassFromShapes(); return body; } //在物理世界中添加圆形Body public Body createCircle(Bitmap bmp, float x, float y, float r, float density) { CircleDef cd = new CircleDef(); cd.density = density; cd.friction = 0.8f; cd.restitution = 0.3f; cd.radius = r / RATE; BodyDef bd = new BodyDef(); bd.position.set((x + r) / RATE, (y + r) / RATE); Body body = world.createBody(bd); body.m_userData = new MyCircle(bmp, x, y, r); body.createShape(cd); body.setMas