在此之前，我只想说我是新手。 我目前正试图在Android上为一个班级项目制作太空射击游戏，但我更关心的是学习更多东西。
我在屏幕上设置了布局，左，右和中间按钮（这个用于拍摄），以及在X坐标上根据箭头方向移动的太空船（位图）。但是我无法想出子弹的代码。我需要做到这一点，因此它获得了船的X位置，但它之后并没有跟随，因为左右不停（X ++和X--），我可以在成功中解雇。此外，我可以在随机的X位置产生敌人，但是由于Android工作室与团结不同，我不知道我应该如何销毁游戏对象，我想要发送它＆＃39;屏幕上的位置，但这不是我的目标。如果有人能帮助我，我会很感激。
package com.example.malditosvirus2.spacegame;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Display;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageView;
import java.util.Random;
public class GameLoop extends SurfaceView {
private
Bitmap bmp;
private Bitmap bmp2;
public int Ys;
private SurfaceHolder holder;
private Bitmap imp;
private Bitmap red;
private Bitmap lef;
private Bitmap rig;
private GameLoopThread gameLoopThread;
// private SpriteAnimation sprite;
//private SpriteAnimation sprite2;
public int b;
public int a;
public int Xs;
private int xPos;
private int yPos;
private GameLoop gameView;
private Bitmap backGround1;
private Bitmap backGround2;
private Bitmap dea;
private int bg1Y = 0;
private int bg2Y = 0;
private int speedScroll = 2;
private int yLowerLimit;
private int Ysize;
private int Xsize;
private int Xmove;
private int Ymove;
boolean right = false;
boolean left = false;
boolean shooting = false;
private boolean start = false;
private int y=-250;
private int x;
private int XB=Xmove;
private int YB=Ysize;
private Bitmap bul;
public GameLoop(Context context) {
super(context);
gameLoopThread = new GameLoopThread(this);
holder = getHolder();
xPos = this.getWidth() / 2;
// for (int i = 0; i < tot; i++) {
// x[i]=rand.nextInt (1000)+ 100;
//x[i] = rnd.nextInt(Xsize * 2 - dea.getWidth());
//Xs = gameView.getWidth() /3;
// Ys = gameView.getHeight();
//}
holder.addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
boolean retry = true;
gameLoopThread.setRunning(false);
while (retry) {
try {
gameLoopThread.join();
retry = false;
} catch (InterruptedException e) {
}
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
gameLoopThread.setRunning(true);
gameLoopThread.start();
}
@Override
public void surfaceChanged(SurfaceHolder holder,
int format, int width,
int height) {
}
});
backGround1 = BitmapFactory.decodeResource(getResources(), R.drawable.bg1);
backGround2 = BitmapFactory.decodeResource(getResources(), R.drawable.bg1);
bg1Y = 0;
bg2Y = (backGround1.getHeight());
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics metrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(metrics);
int width = metrics.widthPixels;
int height = metrics.heightPixels;
Xsize = width / 2;
Xmove = Xsize;
Ysize = height;
yLowerLimit = height - 100;
bmp = BitmapFactory.decodeResource(getResources(), R.drawable.xwing);
rig = BitmapFactory.decodeResource(getResources(), R.drawable.right);
lef = BitmapFactory.decodeResource(getResources(), R.drawable.left);
red = BitmapFactory.decodeResource(getResources(), R.drawable.redball);
dea = BitmapFactory.decodeResource(getResources(), R.drawable.deathstar);
bul= BitmapFactory.decodeResource(getResources(), R.drawable.bullet);
//bmp2 = BitmapFactory.decodeResource(getResources(), R.drawable.cow);
//sprite = new Sprite(this, bmp);
//sprite2 = new SpriteAnimation(this, bmp2);
}
//criar no modo override OnTouchScreen para cima baixo, utilizar codigo anterior
@Override
public void onDraw(Canvas canvas) {
if (right == false && left == false) {
Xmove = Xsize - bmp.getWidth() + 110;
}
if (right == true) {
//for (Xmove = 0; Xmove < Xsize * 2 - bmp.getWidth(); Xmove += 10) ;
Xmove += 20;
if
(Xmove >= Xsize * 2 - bmp.getWidth()) {
Xmove -= 20;
Xmove = Xsize * 2 - bmp.getWidth();
}
}
if (left == true) {
//for (Xmove = 0 - bmp.; Xmove > 0; Xmove -= 10) ;
Xmove -= 20;
if (Xmove <= 0) {
Xmove += 20;
}
}
if (shooting == true) {
YB -= 20;
if (shooting == true && right == true) {
XB--;
}
if (shooting == true && left == true) {
XB++;
if (start == true) {
y += 30;
}
canvas.drawColor(Color.BLACK);
doDrawRunning(canvas);
//sprite.onDraw(canvas, xPos, yPos);
canvas.drawBitmap(red, Xsize - 150, Ysize - red.getHeight() - 10, null);
canvas.drawBitmap(lef, red.getWidth() - 50, Ysize - rig.getHeight() - 10, null);
canvas.drawBitmap(rig, Xsize * 2 - rig.getWidth() * 2 + 50, Ysize - rig.getHeight() - 10, null);
canvas.drawBitmap(bul, XB, YB, null);
canvas.drawBitmap(bmp, Xmove, Ysize / 2 + 500, null);
//
}
//a = xPos + 80;
// b = yPos + 80;
//sprite2.Draw(canvas, a, b);
//
}
}
private void doDrawRunning (Canvas canvas){
Log.i("MovingBackGround", "doDrawRunning");
bg1Y += speedScroll;
bg2Y += speedScroll;
Log.i("MobindBackGround", "bg1Y:" + bg1Y);
Log.i("MobindBackGround", "bg2Y:" + bg2Y);
if (bg1Y > yLowerLimit) {
bg1Y = bg2Y - backGround1.getHeight();
Log.i("MovingBackGround", "novo bg1Y:" + bg1Y);
} else if (bg2Y > yLowerLimit) {
bg2Y = bg1Y - backGround2.getHeight();
Log.i("MovingBackGround", "novo bg2Y:" + bg2Y);
}
canvas.drawBitmap(backGround1, 0, bg1Y, null);
canvas.drawBitmap(backGround2, 0, bg2Y, null);
}
}