Android--2048游戏

一直想做游戏，先拿一个简单点的学习，写的代码分享出来，大神可以指点~

直接上代码：

<span style="font-size:12px;">import android.app.Activity;
import android.os.Bundle;
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;
	}

}</span>

import java.util.ArrayList;
import java.util.List;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Point;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
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) {
		super(context);

		initGameView();
	}

	public GameView(Context context, AttributeSet attrs) {
		super(context, attrs);

		initGameView();
	}

	private void initGameView(){
		setColumnCount(4);
		setBackgroundColor(0xffbbada0);

		setOnTouchListener(new View.OnTouchListener() {

			private float startX,startY,offsetX,offsetY;

			@Override
			public boolean onTouch(View v, MotionEvent event) {

				switch (event.getAction()) {
				case MotionEvent.ACTION_DOWN:
					startX = event.getX();
					startY = event.getY();
					break;
				case MotionEvent.ACTION_UP:
					offsetX = event.getX()-startX;
					offsetY = event.getY()-startY;

					if (Math.abs(offsetX)>Math.abs(offsetY)) {
						if (offsetX<-5) {
							swipeLeft();
						}else if (offsetX>5) {
							swipeRight();
						}
					}else{
						if (offsetY<-5) {
							swipeUp();
						}else if (offsetY>5) {
							swipeDown();
						}
					}

					break;
				}
				return true;
			}
		});
	}

	@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);

		startGame();
	}

	private void addCards(int cardWidth,int cardHeight){

		Card c;

		for (int y = 0; y < 4; y++) {
			for (int x = 0; x < 4; x++) {
				c = new Card(getContext());
				c.setNum(0);
				addView(c, cardWidth, cardHeight);

				cardsMap[x][y] = c;
			}
		}
	}

	private void startGame(){

		MainActivity.getMainActivity().clearScore();

		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();

		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);
	}

	private void swipeLeft(){

		boolean merge = false;

		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--;

							merge = true;
						}else if (cardsMap[x][y].equals(cardsMap[x1][y])) {
							cardsMap[x][y].setNum(cardsMap[x][y].getNum()*2);
							cardsMap[x1][y].setNum(0);

							MainActivity.getMainActivity().addScore(cardsMap[x][y].getNum());
							merge = true;
						}

						break;
					}
				}
			}
		}

		if (merge) {
			addRandomNum();
			checkComplete();
		}
	}
	private void swipeRight(){

		boolean merge = false;

		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++;
							merge = true;
						}else if (cardsMap[x][y].equals(cardsMap[x1][y])) {
							cardsMap[x][y].setNum(cardsMap[x][y].getNum()*2);
							cardsMap[x1][y].setNum(0);
							MainActivity.getMainActivity().addScore(cardsMap[x][y].getNum());
							merge = true;
						}

						break;
					}
				}
			}
		}

		if (merge) {
			addRandomNum();
			checkComplete();
		}
	}
	private void swipeUp(){

		boolean merge = false;

		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--;

							merge = true;
						}else if (cardsMap[x][y].equals(cardsMap[x][y1])) {
							cardsMap[x][y].setNum(cardsMap[x][y].getNum()*2);
							cardsMap[x][y1].setNum(0);
							MainActivity.getMainActivity().addScore(cardsMap[x][y].getNum());
							merge = true;
						}

						break;

					}
				}
			}
		}

		if (merge) {
			addRandomNum();
			checkComplete();
		}
	}
	private void swipeDown(){

		boolean merge = false;

		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++;
							merge = true;
						}else if (cardsMap[x][y].equals(cardsMap[x][y1])) {
							cardsMap[x][y].setNum(cardsMap[x][y].getNum()*2);
							cardsMap[x][y1].setNum(0);
							MainActivity.getMainActivity().addScore(cardsMap[x][y].getNum());
							merge = true;
						}

						break;
					}
				}
			}
		}

		if (merge) {
			addRandomNum();
			checkComplete();
		}
	}

	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("你好").setMessage("游戏结束").setPositiveButton("重来", new DialogInterface.OnClickListener() {

				@Override
				public void onClick(DialogInterface dialog, int which) {
					startGame();
				}
			}).show();
		}

	}

	private Card[][] cardsMap = new Card[4][4];
	private List<Point> emptyPoints = new ArrayList<Point>();
}

import android.content.Context;
import android.view.Gravity;
import android.widget.FrameLayout;
import android.widget.TextView;

public class Card extends FrameLayout {

	public Card(Context context) {
		super(context);

		label = new TextView(getContext());
		label.setTextSize(32);
		label.setBackgroundColor(0x33ffffff);
		label.setGravity(Gravity.CENTER);

		LayoutParams lp = new LayoutParams(-1, -1);
		lp.setMargins(10, 10, 0, 0);
		addView(label, lp);

		setNum(0);
	}

	private int num = 0;

	public int getNum() {
		return num;
	}

	public void setNum(int num) {
		this.num = num;

		if (num<=0) {
			label.setText("");
		}else{
			label.setText(num+"");
		}
	}

	public boolean equals(Card o) {
		return getNum()==o.getNum();
	}

	private TextView label;
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.a2048.MainActivity"
    android:orientation="vertical"
    >

    <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/gameScore"
	        android:layout_width="wrap_content"
	        android:layout_height="wrap_content"
	         />
	</LinearLayout>
	<com.example.a2048.gameView
	    android:id="@+id/gameView"
	    android:layout_width="fill_parent"
	    android:layout_height="0dp"
	    android:layout_weight="1"
	    >

	</com.example.a2048.gameView>
</LinearLayout>