Android 开发飞机大战

首先关键一个class文件叫GameSurfaceView

1、定义

可以直接从内存或者DMA等硬件接口取得图像数据,是个非常重要的绘图容器。

它的特性是：可以在主线程之外的线程中向屏幕绘图上。这样可以避免画图任务繁重的时候造成主线程阻塞，从而提高了程序的反应速度。在游戏开发中多用到SurfaceView，游戏中的背景、人物、动画等等尽量在画布canvas中画出。

2、实现

首先继承SurfaceView并实现SurfaceHolder.Callback接口 使用接口的原因：因为使用SurfaceView 有一个原则，所有的绘图工作必须得在Surface 被创建之后才能开始(Surface—表面，这个概念在 图形编程中常常被提到。基本上我们可以把它当作显存的一个映射，写入到Surface 的内容                       可以被直接复制到显存从而显示出来，这使得显示速度会非常快)，而在Surface 被销毁之前必须结束。所以Callback 中的surfaceCreated 和surfaceDestroyed 就成了绘图处理代码的边界。

package com.example.dfcn.myapplication;

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;
import android.widget.Button;

/**
 * Created by 11918 on 2017/5/24.
 */

public class GameSurfaceView extends SurfaceView implements SurfaceHolder.Callback {
    private Paint paint;//画笔
    private Canvas canvas;//画布
    private SurfaceHolder surfaceHolder;
    private Button btn1 = null;

    private GameMenu menu;
    private Bitmap bmpMenuBG;
    private Bitmap bmpLogo;
    private Bitmap bmpButton;
    private Bitmap bmpText;



    public static int screenWidth;
    public static int screenHight;
    public static int i=5;

    public GameSurfaceView(Context context) {
        super(context);
        //初始化surfaceHolder
        surfaceHolder = this.getHolder();
        //添加回调函数
        surfaceHolder.addCallback(this);
        paint = new Paint();//创建画笔
        paint.setAntiAlias(true);//取消锯齿
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        screenWidth = this.getWidth();
        screenHight = this.getHeight();
        initBitmap();

        new Thread(new Runnable() {
            @Override
            public void run() {
                while (true) {
                    myDraw();
                }
            }
        }).start();


    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {

    }

    private void myDraw() {
        //canvas进行锁定
        canvas = surfaceHolder.lockCanvas();
        menu.drawMenu(canvas,paint);


        if(canvas!=null){
            //解锁画布，呈现到视图接口
            surfaceHolder.unlockCanvasAndPost(canvas);
        }
    }

    private void initBitmap() {
        //把图片转化成Bitmap格式
        bmpMenuBG = BitmapFactory.decodeResource(this.getResources(),R.drawable.mainmenu);
        bmpLogo = BitmapFactory.decodeResource(this.getResources(),R.drawable.logo);
        bmpButton = BitmapFactory.decodeResource(this.getResources(),R.drawable.menustart);
        bmpText = BitmapFactory.decodeResource(this.getResources(),R.drawable.starttext);
        menu = new GameMenu(bmpMenuBG,bmpLogo,bmpButton,bmpText);



    }
}

然后在创建一个Menu文件来调试背景字体的格局具体代码如下：

package com.example.dfcn.myapplication;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;

/**
 * Created by 11918 on 2017/5/24.
 */

public class GameMenu {
    private Bitmap bmpMenuBG;
    private Bitmap bmpLogo;
    private Bitmap bmpButton;
    private Bitmap bmpText;
    private Rect rect1,rect2;



    public GameMenu(Bitmap bmpMenuBG,Bitmap bmpLogo,Bitmap bmpButton,Bitmap bmpText){
        this.bmpMenuBG = bmpMenuBG;
        this.bmpLogo = bmpLogo;
        this.bmpButton = bmpButton;
        this.bmpText = bmpText;

        rect1 = new Rect(0,GameSurfaceView.screenHight/3,GameSurfaceView.screenWidth,GameSurfaceView.screenHight/3+GameSurfaceView.screenHight/5);
        rect2 = new Rect(0,0,GameSurfaceView.screenWidth,GameSurfaceView.screenHight);
    }

    public void drawMenu(Canvas canvas, Paint paint){


        canvas.drawBitmap(bmpMenuBG,null,rect2,paint);


        canvas.drawBitmap(bmpLogo,null,rect1,paint);

        int x1 = GameSurfaceView.screenWidth/2-bmpButton.getWidth()/2;
        int y1 = GameSurfaceView.screenHight/3*2;
        canvas.drawBitmap(bmpButton,x1,y1,paint);


        int x2 = GameSurfaceView.screenWidth/2-bmpText.getWidth()/2;
        int y2 = GameSurfaceView.screenHight/3*2;
        canvas.drawBitmap(bmpText,x2,y2+10,paint);
    }

}