飞机大战项目（1）主菜单

首先正式在制作飞机打战之前我们先把所需的图片导入Android Studio中放在app/main/res/dawable/，目录下；（导入的方法直接复制图片，之后选中dawable文件夹粘贴即可）

主界面总体包括：

一.GameSurface类

内有包括：

1.画图所需的属性

// 画图

private SurfaceHolder surfaceHolder ; // 包装类

private Canvas canvas ; // 画布

private Paint paint ; // 画笔

// 与屏幕坐标

public static int screenWidht ; // 屏幕宽度

public static int screenHight ; // 屏幕高度

//Menu 相关的 图片元素

private GameMenu gameMenu ;

private Bitmap bmpMenuBG ; // 背景图片

private Bitmap bmpMenuLogo ; // 菜单页面 Logo

private Bitmap bmpMenuButton ; // 菜单页面按钮

private Bitmap bmpMenuTxt ;

2.继承extends SurfaceView类时需要重写的 GameSurface(Context context)类

public GameSurface(Context context) {

super (context);

surfaceHolder = this .getHolder(); // 初始化 holder( 类似于工具）

surfaceHolder .addCallback( this ); // 回调函数

paint = new Paint(); // 初始化画笔

paint .setAntiAlias( true ); // 抗锯齿

}

3.实现 surfaceCreated .Callback接口时会产生（三个方法），将 (SurfaceHolder holder)类进行重写了 ， 添加一个主线程 （new Thread）。

@Override

public void surfaceCreated(SurfaceHolder holder) {

screenWidht = this .getWidth();

screenHight = this .getHeight();

initBitmap();

new Thread( new Runnable() {

@Override

public void run() {

MyDraw();

}

}).start();

}

4，初始化画图工具方法MyDraw（） ，

/**

* 绘图方法

*/

private void MyDraw() {

// 画布锁定初始化

canvas = surfaceHolder .lockCanvas();

gameMenu .drow( canvas , paint ); // 实例化的 gameMenu 调用 drow 方法画出图片

if ( canvas != null ) {

surfaceHolder .unlockCanvasAndPost( canvas );

}

}

5.initBitmap（），初始化图片元素的方法 把图片转化成BitmapFactory类型的图片

private void initBitmap() {

// 把图片转化成 BitmapFactory

bmpMenuBG = BitmapFactory. decodeResource (

this .getResources(), R.drawable. mainmenu );

bmpMenuButton = BitmapFactory. decodeResource (

this .getResources(), R.drawable. menustart );

bmpMenuTxt = BitmapFactory. decodeResource (

this .getResources(), R.drawable. starttext );

bmpMenuLogo = BitmapFactory. decodeResource (

this .getResources(), R.drawable. logo );

// 初始化

gameMenu = new GameMenu( bmpMenuBG , bmpMenuLogo , bmpMenuButton , bmpMenuT xt );

}

完成后：

package com.example.gamemean;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.icu.util.Calendar;

import android.os.Build;

import android.support.annotation.RequiresApi ;

import android.view.Menu;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

/**

* Created by 小泽 on 2017/5/24.

*/

@RequiresApi (api = Build.VERSION_CODES. N )

public class GameSurface extends SurfaceView implements SurfaceHolder.Callback {

private SurfaceHolder surfaceHolder ; // 包装类

private Canvas canvas ; // 画布

private Paint paint ; // 画笔

public static int screenWidht ; // 屏幕宽度

public static int screenHight ; // 屏幕高度

//Menu 相关的

private GameMenu gameMenu ;

private Bitmap bmpMenuBG ; // 背景图片

private Bitmap bmpMenuLogo ; // 菜单页面 Logo

private Bitmap bmpMenuButton ; // 菜单页面按钮

private Bitmap bmpMenuTxt ;

public GameSurface(Context context) {

super (context);

surfaceHolder = this .getHolder(); // 初始化 holder( 类似于工具）

surfaceHolder .addCallback( this ); // 回调函数

paint = new Paint(); // 初始化画笔

paint .setAntiAlias( true ); // 抗锯齿

}

@Override

public void surfaceCreated(SurfaceHolder holder) {

screenWidht = this .getWidth();

screenHight = this .getHeight();

initBitmap();

new Thread( new Runnable() {

@Override

public void run() {

MyDraw();

}

}).start();

}

@Override

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

}

@Override

public void surfaceDestroyed(SurfaceHolder holder) {

}

/**

* 绘图方法

*/

private void MyDraw() {

// 画布锁定初始化

canvas = surfaceHolder .lockCanvas();

gameMenu .drow( canvas , paint ); // 实例化的 gameMenu 调用 drow 方法画出图片

if ( canvas != null ) {

surfaceHolder .unlockCanvasAndPost( canvas );

}

}

private void initBitmap() {

// 把图片转化成 BitmapFactory

bmpMenuBG = BitmapFactory.decodeResource(

this .getResources(), R.drawable. mainmenu );

bmpMenuButton = BitmapFactory.decodeResource(

this .getResources(), R.drawable. menustart );

bmpMenuTxt = BitmapFactory.decodeResource(

this .getResources(), R.drawable. starttext );

bmpMenuLogo = BitmapFactory.decodeResource(

this .getResources(), R.drawable. logo );

// 初始化

gameMenu = new GameMenu( bmpMenuBG , bmpMenuLogo , bmpMenuButton , bmpMenuTxt );

}

}

二.GameMenu类

package com.example.gamemean;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.graphics.Rect;

/**

* Created by 小泽 on 2017/5/24.

*/

public class GameMenu {

private Bitmap bmpMenuBG; // 背景图片

private Bitmap bmpMenuLogo ; // 菜单页面 Logo

private Bitmap bmpMenuButton ; // 菜单页面按钮

private Bitmap bmpMenuTxt ; // 菜单页面文本

private Rect rect ; // 创建一个长方形，放置飞机大战 LOGO, 因为 logo 图片过大，所以先填充一个长方体

// 构造函数初始化

public GameMenu(Bitmap bmpMenuBG, Bitmap bmpMenuLogo, Bitmap bmpMenuButton, Bitmap bmpMenuTxt) {

this .bmpMenuBG = bmpMenuBG;

this . bmpMenuButton = bmpMenuButton;

this . bmpMenuLogo = bmpMenuLogo;

this . bmpMenuTxt = bmpMenuTxt;

rect = new Rect( 0 , GameSurface. screenHight / 3 , GameSurface. screenWidht ,

GameSurface. screenHight / 3 + GameSurface. screenHight / 5 );

// 此处三个参数

}

/**

* 画图

*

* @param canvas

* @param paint

*/

public void drow(Canvas canvas, Paint paint) {

// 菜单背景

canvas.drawBitmap(bmpMenuBG, 0 , 0 , paint);

// 画飞机大战 logo ，放入长方形中

canvas.drawBitmap( bmpMenuLogo , null , rect , paint);

// 画按钮

int x = GameSurface. screenHight / 3 * 2 ;

int y = GameSurface. screenWidht / 2 - bmpMenuButton .getWidth() / 2 ;

canvas.drawBitmap( bmpMenuButton , y, x, paint);

// 画文本

int m = y + bmpMenuButton .getWidth() / 6 ;

int n = x + bmpMenuButton .getHeight() / 6 ;

canvas.drawBitmap( bmpMenuTxt , m, n, paint);

//

}

}

注意： 个元素坐标需要进行调试

三.MainActivity类

package com.example.gamemean;

import android.os.Build;

import android.support.annotation.RequiresApi ;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

@RequiresApi (api = Build.VERSION_CODES. N )

@Override

protected void onCreate(Bundle savedInstanceState) {

super .onCreate(savedInstanceState);

setContentView( new GameSurface( this ));

}

}