Andriod Studio 之飞机大战-构建游戏开始界面

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1.主要思路：在Android Studio 中新建游戏界面，并构造出主线程，另外在创建一个类作为游戏界面，在界面在新建一个方法，目的是交由游戏界面类调用；
2.具体方法（代码）：

package com.example.fpl.helloworld;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Paint;import android.view.SurfaceHolder;import android.view.SurfaceView;/** * Created by FPL on 2017/5/24. */public class GameSurface extends SurfaceView implements SurfaceHolder.Callback {    private  GameMenu gameMenu;    private Bitmap bmpMainBG;    private Bitmap bmpLogo;    private Bitmap bmpButton;    private Bitmap bmpText;    public  static  int screenwidth;    public  static  int  screenheight;    private SurfaceHolder surfaceHolder;            private Canvas canvas;    private Paint paint;    public GameSurface(Context context) {        super(context);        surfaceHolder = this.getHolder();        surfaceHolder.addCallback(this);        paint=new Paint();        paint.setAntiAlias(true);    }    @Override    public void surfaceCreated(SurfaceHolder holder) {        screenwidth=this.getWidth();        screenheight=this.getHeight();        initBitmap();        new Thread(new Runnable() {            @Override            public void run() {                mydraw();            }        }).start();    }    private void mydraw() {        canvas=surfaceHolder.lockCanvas();       gameMenu.draw(canvas,paint);        if (canvas!=null){            surfaceHolder.unlockCanvasAndPost(canvas);        }    }    private  void  initBitmap(){        bmpMainBG= BitmapFactory.decodeResource(this.getResources(),R.drawable.mainmenu);        bmpLogo= BitmapFactory.decodeResource(this.getResources(),R.drawable.logo);        bmpButton= BitmapFactory.decodeResource(this.getResources(),R.drawable.menustartpress);        bmpText= BitmapFactory.decodeResource(this.getResources(),R.drawable.starttext);        gameMenu=new GameMenu(bmpMainBG,bmpLogo,bmpButton,bmpText);    }    @Override    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {    }    @Override    public void surfaceDestroyed(SurfaceHolder holder) {    }}package com.example.fpl.helloworld;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Rect;/** * Created by FPL on 2017/5/24. */public class GameMenu {    private Bitmap bmpMainBG;    private Bitmap bmpLogo;    private Bitmap bmpButton;    private Bitmap bmpText;    private Rect rect;    private Rect rect2;public   GameMenu(Bitmap bmpMainBG,Bitmap bmpLogo,Bitmap bmpButton,Bitmap bmpText ){    this.bmpButton=bmpButton;    this.bmpLogo=bmpLogo;    this.bmpMainBG=bmpMainBG;    this.bmpText=bmpText;    rect=new Rect(0,GameSurface.screenheight/6,GameSurface.screenwidth,GameSurface.screenheight/5+GameSurface.screenheight/5);    rect2=new Rect(0,0,GameSurface.screenwidth,GameSurface.screenheight);}  public  void draw(Canvas canvas, Paint paint) {      canvas.drawBitmap(bmpMainBG,null,rect2,paint);      canvas.drawBitmap(bmpLogo,null,rect,paint);      int x=GameSurface.screenwidth/2-bmpButton.getWidth()/2;      int y=GameSurface.screenheight/3*2;      canvas.drawBitmap(bmpButton,x,y,paint);      int x1=GameSurface.screenwidth/2-bmpText.getWidth()/2;      int y1=GameSurface.screenheight/3*2+20;      canvas.drawBitmap(bmpText,x1,y1,paint);    }}

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