Android studio 飞机大战项目思路和代码

整体思路

先背景

绘制玩家飞机，玩家飞机随触摸点移动

绘制boss飞机，自动移动

绘制子弹，分别从玩家飞机和boss飞机发射

绘制爆装效果，由子弹触发

绘制血量，玩家血量为0触发死亡画面，boss血量为零触发通过

绘制开始界面，点击开机进入游戏

 

 

1.如何绘制滚动的背景图片

第一张图y坐标往下递减实现滚动，

第二张图的底部坐标等于第一张图的顶部坐标，当第一张图片的顶部坐标大于屏幕，令其底部坐标等于第二张图的顶部坐标实现循环滚动。

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

class BackGround {
    private  int y1;
    private  int y2;
    private Bitmap bitmap;

    public BackGround(Bitmap bitmap){
        this.bitmap = bitmap;
        y1=0;
        y2=y1-bitmap.getHeight();
    }
    public void draw(Canvas canvas,Paint paint){
        logic();
        canvas.drawBitmap(bitmap,0,y1,paint);
        canvas.drawBitmap(bitmap,0,y2,paint);
    }

    public void logic() {
        y1+=10;
        y2+=10;
        if (y1>=MySurfaceView.height){
            y1=y2-bitmap.getHeight();//移动到第二张图片的顶部
        }
        if (y2>=MySurfaceView.height){
            y2=y1-bitmap.getHeight();
        }
    }

 

 

 

2.如何绘制飞机

 

 用canvas调用drawBitmap

 

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.view.MotionEvent;
public class Myplane {
    private Bitmap bitmap;
    private Bitmap bitmapHp;
    private int x,y;
    private int width,height;
    private boolean noCollision;
    private int noCollisionCount;

    private int hp = 3;

    public Myplane(Bitmap bitmap, Bitmap bitmapHp){
        this.bitmap = bitmap;
        this.bitmapHp = bitmapHp;
        x = MySurfaceView.width/2-bitmap.getWidth()/2;
        y = MySurfaceView.height-bitmap.getHeight();
        width = bitmap.getWidth();
        height = bitmap.getHeight();
    }
    public void draw(Canvas canvas,Paint paint){
        if (noCollision){
            noCollisionCount++;
            if (noCollisionCount%10==0){
                canvas.drawBitmap(bitmap,x,y,paint);//飞机闪烁
            }
            if (noCollisionCount>100){//无敌时间
                noCollision = false;
                noCollisionCount = 0;
            }
        }else {
            //非无敌状态
            canvas.drawBitmap(bitmap,x,y,paint);
        }
        
        for (int i = 0; ix&&exy&&eyMySurfaceView.height){
                    y=MySurfaceView.height-height;
                }
            }
        }
    }

    public boolean isCollision(Bullet bullet){
        if (noCollision){
            return false;
        }else{
            if (bullet.getX()>x&&bullet.getX()

 

3.如何绘制子弹

 

 

 用canvas调用drawBitmap

 

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

public class Bullet {
    private Bitmap bitmap;
    private int x, y;
    private int speed = 10;
    private boolean isDead;
    private int type;

    public Bullet(Bitmap bitmap, int x, int y,int type) {
        this.bitmap = bitmap;
        this.x = x;
        this.y = y;
        this.type = type;

    }

    public void draw(Canvas canvas, Paint paint) {
        canvas.drawBitmap(bitmap, x, y, paint);
        logic();
    }

    public void logic() {

       switch (type){
           //玩家子弹
           case 0:
               y -= speed;
               if (y < 0) {
                   isDead = true;
               }
               break;
           //Boss子弹
           case 1:
               y += speed;
               if (y < 0) {
                   isDead = true;
               }
               break;
       }
    }

    public boolean isDead() {
        return isDead;
    }
    public Bitmap getBitmap(){
        return bitmap;
    }
    public int getX(){
        return x;
    }

    public int getY() {
        return y;
    }
}

 

4.如何判断碰撞

 

子弹的左右x坐标在飞机左右x坐标里面

 public boolean isCollision(Bullet bullet) {
        if (noCollision) {
            return false;
        } else {
            if (bullet.getX() > x && bullet.getX() < x + width && bullet.getY() > y && bullet.getY() < y + height) {
                noCollision = true;
                if (hp >= 0) {
                    hp--;
                }
                return true;
            }
        }
        return false;
    }

 

5.如何绘制爆装效果

 

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

public class Boom {
    private Bitmap bitmap;
    private int x,y;
    private int totalFrame;
    private int currentFrame;//当前显示的第几幅画面
    private int frameH,frameW;
    private boolean isEnd;

    public Boom(Bitmap bitmap,int x,int y,int totalFrame){
        this.bitmap = bitmap;
        this.x = x;
        this.y = y;
        this.totalFrame = totalFrame;
        frameH = bitmap.getHeight();
        frameW = bitmap.getWidth()/totalFrame;
    }
    public void draw(Canvas canvas, Paint paint){
        canvas.save();
        canvas.clipRect(x,y,x+frameW,y+frameH);
        canvas.drawBitmap(bitmap,x-currentFrame*frameW,y,paint);
        canvas.restore();
        logic();
    }
    public void logic(){
        if (currentFrame

 

 

 

 

6.如何添加音效

import android.content.Context;
import android.media.AudioManager;
import android.media.SoundPool;

public class GameSoundPool {
    private SoundPool soundPool;
    private int s1;
    private int s2;


    public GameSoundPool(Context context){
        this.soundPool = new SoundPool(2, AudioManager.STREAM_MUSIC,0);
        s1 = soundPool.load(context,R.raw.shoot,1);
        s2 = soundPool.load(context,R.raw.explosion2,1);
    }
    public void playSound(int s){
        switch (s){
            case 1:

                soundPool.play(s1,1,1,1,0,1.0f);
                break;
            case 2:
                soundPool.play(s2,1,1,1,0,1.0f);
                break;
        }


    }
}

 

 

 

定义变量时常常用到封装。

需要用某个类的功能但又想扩展一些功能，可以继承那个类。

public class MySurfaceView extends SurfaceView 

实现接口

public class MySurfaceView extends SurfaceView implements SurfaceHolder.Callback,Runnable implements SurfaceHolder.Callback,Runnable