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[操作系统]Android项目开发实战


《2048》是一款比较流行的数字游戏,最早于2014年3月20日发行。原版2048首先在GitHub上发布,原作者是Gabriele Cirulli,后被移植到各个平台。这款游戏是基于《1024》和《小3传奇》的玩法开发而成的新型数字游戏。游戏源地址:http://gabrielecirulli.github.io/2048/

1、新建android项目game2048

修改activity_main.

<LinearLayout ="http://schemas.android.com/apk/res/android"  ="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical"  tools:context=".MainActivity" >  <TextView    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="@string/hello_world" /></LinearLayout>

2、设计2048游戏布局

继续修改activity_main.

<LinearLayout ="http://schemas.android.com/apk/res/android"  ="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical"  tools:context=".MainActivity" >  <LinearLayout    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:orientation="horizontal" >    <TextView      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="@string/score" />    <TextView      android:id="@+id/tvScore"      android:layout_width="wrap_content"      android:layout_height="wrap_content" />  </LinearLayout>  <GridLayout    android:id="@+id/gameView"    android:layout_width="fill_parent"    android:layout_height="0dp"    android:layout_weight="1" >  </GridLayout></LinearLayout>

3、实现2048游戏主类GameView

新建类GameView,继承自GridLayout

package com.wuyudong.game2048;import android.content.Context;import android.util.AttributeSet;import android.widget.GridLayout;public class GameView extends GridLayout {  public GameView(Context context, AttributeSet attrs, int defStyle) {    super(context, attrs, defStyle);    initGameView();  }  public GameView(Context context, AttributeSet attrs) {    super(context, attrs);    initGameView();  }  public GameView(Context context) {    super(context);    initGameView();  }  private void initGameView() {  }}

继续修改activity_main.

<LinearLayout ="http://schemas.android.com/apk/res/android"  ="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical"  tools:context=".MainActivity" >  <LinearLayout    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:orientation="horizontal" >    <TextView      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="@string/score" />    <TextView      android:id="@+id/tvScore"      android:layout_width="wrap_content"      android:layout_height="wrap_content" />  </LinearLayout>  <!-- 把类GameView绑定到一起 -->  <com.wuyudong.game2048.GameView    android:id="@+id/gameView"    android:layout_width="fill_parent"    android:layout_height="0dp"    android:layout_weight="1" >  </com.wuyudong.game2048.GameView></LinearLayout>

4、游戏2048在Android平台的触控交互设计

添加触控交互相关代码

  private void initGameView() {    setOnTouchListener(new OnTouchListener() {      //记录起始位置和偏移坐标      private float startX, startY, offsetX, offsetY;      @Override      public boolean onTouch(View v, MotionEvent event) {        switch (event.getAction()) {        case MotionEvent.ACTION_DOWN: //监听手指按下的初始位置坐标          startX = event.getX();          startY = event.getY();          break;        case MotionEvent.ACTION_UP: //监听手指离开时的位置坐标          offsetX = event.getX() - startX;          offsetY = event.getY() - startY;          if (Math.abs(offsetX) > Math.abs(offsetY)) {            if (offsetX < -5) {              System.out.println("left");            } else if (offsetX > 5) {              System.out.println("right");            }          } else {            if (offsetY < -5) {              System.out.println("up");            } else if (offsetY > 5) {              System.out.println("down");            }          }          break;        default:          break;        }        return true;      }    });  }

5、实现2048游戏的卡片类

编写卡片类Card.java

package com.wuyudong.game2048;import android.content.Context;import android.widget.FrameLayout;import android.widget.TextView;public class Card extends FrameLayout {  public Card(Context context) {    super(context);    lable = new TextView(getContext());    lable.setTextSize(32);    LayoutParams lp = new LayoutParams(-1, -1);    addView(lable, lp);    setNum(0);  }  private int num = 0;  public int getNum() {    return num;  }  public void setNum(int num) {    this.num = num;    lable.setText(num + "");  }  public boolean equals(Card o) {    return getNum() == o.getNum();  }  private TextView lable;}

6、添加2048游戏卡片

先添加相关代码看看效果

  @Override  protected void onSizeChanged(int w, int h, int oldw, int oldh) {    super.onSizeChanged(w, h, oldw, oldh);    int cardWidth = (Math.min(w, h) - 10) / 4;        addCards(cardWidth, cardWidth);  }    private void addCards(int cardWith, int cardHeight){    Card c;    for (int y = 0; y < 4; y++) {      for (int x = 0; x < 4; x++) {        c=new Card(getContext());        c.setNum(2);        addView(c, cardWith, cardHeight);      }    }  }

运行后的效果

出现问题,所有的2都出现在同一行中,解决办法:

在initGameView() 中添加代码,指定为四列:setColumnCount(4);

lable.setGravity(Gravity.CENTER);

接着添加相关的背景颜色以及卡片数字的背景颜色,还有卡片间距

setBackgroundColor(0xffbbada0); // 设置整体背景lable.setBackgroundColor(0x33ffffff);lable.setGravity(Gravity.CENTER);lp.setMargins(10, 10, 0, 0);

运行后界面如下:

7、在2048游戏中添加随机数

  protected void onSizeChanged(int w, int h, int oldw, int oldh) {    super.onSizeChanged(w, h, oldw, oldh);    int cardWidth = (Math.min(w, h) - 10) / 4;    addCards(cardWidth, cardWidth);        startGame();  }  private void startGame() {    for (int y = 0; y < 4; y++) {      for (int x = 0; x < 4; x++) {        cardsMap[x][y].setNum(0);      }    }    addRandomNum();    addRandomNum();  }  private void addRandomNum() {    emptyPoints.clear();// 清空    for (int y = 0; y < 4; y++) {      for (int x = 0; x < 4; x++) {        if (cardsMap[x][y].getNum() <= 0) {          emptyPoints.add(new Point(x, y));        }      }    }    Point p = emptyPoints.remove((int) (Math.random() * emptyPoints.size()));    cardsMap[p.x][p.y].setNum(Math.random() > 0.1 ? 2 : 4);  }

8、实现2048游戏逻辑

  private void swipeLeft() { // 往左滑动手指    for (int y = 0; y < 4; y++) {      for (int x = 0; x < 4; x++) {                for (int x1 = x + 1; x1 < 4; x1++) {          if (cardsMap[x1][y].getNum() > 0) {                        if (cardsMap[x][y].getNum() <= 0) {              cardsMap[x][y].setNum(cardsMap[x1][y].getNum());              cardsMap[x1][y].setNum(0);                            x--;              break;            } else if(cardsMap[x][y].equals(cardsMap[x1][y])){              cardsMap[x][y].setNum(cardsMap[x][y].getNum()*2);              cardsMap[x1][y].setNum(0);              break;            }          }        }      }    }  }  private void swipeRight() {    for (int y = 0; y < 4; y++) {      for (int x = 3; x >=0; x--) {                for (int x1 = x - 1; x1 >=0; x1--) {          if (cardsMap[x1][y].getNum() > 0) {                        if (cardsMap[x][y].getNum() <= 0) {              cardsMap[x][y].setNum(cardsMap[x1][y].getNum());              cardsMap[x1][y].setNum(0);                            x++;              break;            } else if(cardsMap[x][y].equals(cardsMap[x1][y])){              cardsMap[x][y].setNum(cardsMap[x][y].getNum()*2);              cardsMap[x1][y].setNum(0);              break;            }          }        }      }    }  }  private void swipeUp() {    for (int x = 0; x < 4; x++) {      for (int y = 0; y < 4; y++) {                for (int y1 = y + 1; y1 < 4; y1++) {          if (cardsMap[x][y1].getNum() > 0) {                        if (cardsMap[x][y].getNum() <= 0) {              cardsMap[x][y].setNum(cardsMap[x][y1].getNum());              cardsMap[x][y1].setNum(0);                            y--;              break;            } else if(cardsMap[x][y].equals(cardsMap[x][y1])){              cardsMap[x][y].setNum(cardsMap[x][y].getNum()*2);              cardsMap[x][y1].setNum(0);              break;            }          }        }      }    }  }  private void swipeDown() {    for (int x = 0; x < 4; x++) {      for (int y = 3; y >=0; y--) {                for (int y1 = y - 1; y1 >= 0; y1--) {          if (cardsMap[x][y1].getNum() > 0) {                        if (cardsMap[x][y].getNum() <= 0) {              cardsMap[x][y].setNum(cardsMap[x][y1].getNum());              cardsMap[x][y1].setNum(0);                            y++;              break;            } else if(cardsMap[x][y].equals(cardsMap[x][y1])){              cardsMap[x][y].setNum(cardsMap[x][y].getNum()*2);              cardsMap[x][y1].setNum(0);              break;            }          }        }      }    }  }  private Card[][] cardsMap = new Card[4][4];  private List<Point> emptyPoints = new ArrayList<Point>();

9、游戏2048计分

MainActivity.java 中添加相关代码:

package com.wuyudong.game2048;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.widget.TextView;public class MainActivity extends Activity {  public MainActivity() {    mainActivity = this;  }  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    tvScore = (TextView) findViewById(R.id.tvScore);  }  @Override  public boolean onCreateOptionsMenu(Menu menu) {    // Inflate the menu; this adds items to the action bar if it is present.    getMenuInflater().inflate(R.menu.main, menu);    return true;  }  public void clearScore() {    score = 0;    showScore();  }  public void showScore() {    tvScore.setText(score + "");  }  public void addScore(int s) {    score += s;    showScore();  }  private int score = 0;  private TextView tvScore;  private static MainActivity mainActivity = null;  public static MainActivity getMainActivity() {    return mainActivity;  }}

10、检查2048游戏结束

  private void checkComplete() {    boolean complete = true;    ALL: for (int y = 0; y < 4; y++) {      for (int x = 0; x < 4; x++) {        if (cardsMap[x][y].getNum() == 0            || (x > 0 && cardsMap[x][y].equals(cardsMap[x - 1][y]))            || (x < 3 && cardsMap[x][y].equals(cardsMap[x + 1][y]))            || (y > 0 && cardsMap[x][y].equals(cardsMap[x][y - 1]))            || (y < 3 && cardsMap[x][y].equals(cardsMap[x][y + 1]))) {          complete = false;          break ALL;        }      }    }    if (complete) {      new AlertDialog.Builder(getContext())          .setTitle("Oh")          .setMessage("Game Over!")          .setPositiveButton("restart",              new DialogInterface.OnClickListener() {                @Override                public void onClick(DialogInterface dialog,                    int which) {                  startGame();                }              }).show();    }  }