我创建了一个名为score的视频游戏，它保存了用户杀死的每一只鸟的得分。
因此，基本上在10个分数之后，我希望背景自动替换为另一个。我尝试将分数初始化为一个静态变量，并且在我的gameview activity getscore中创建了一个唯一的方法来返回它的值。
之后，我用if语句将值传递给background类，以自动替换背景，但它不起作用背景保持原样，并且在10分后不会替换。如果有人能帮助我，我将非常高兴
这是我的密码：

package com.example.gobirdgo;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.media.AudioAttributes;
import android.media.AudioManager;
import android.media.SoundPool;
import android.os.Build;
import android.view.MotionEvent;
import android.view.SurfaceView;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class GameView extends SurfaceView implements Runnable {
    private int screenX,screenY;
    public static int score=0;
    public int candyhouseheight,candyhousewidth;
    private FlightActivity flight;
    private BirdActivity[]birds;
    private Boolean isGameOver=false;
    private SoundPool soundPool;
    private int sound;
    Context context;

    private Random random;
    private SharedPreferences prefs;
    Bitmap candyhouse1;
    int candyX,candyY;
    private Paint paint;
    private Thread thread;
    private GameActivity activity;
    public static float screenRatioX,screenRatioY;//suit the screen to every app
    private boolean isPlaying;
    private List<BulletActivity>bullets;
    private Background background1,background2;
    public GameView(GameActivity activity, int screenX, int screenY) {
        super(activity);
        prefs=activity.getSharedPreferences("game",Context.MODE_PRIVATE);
        if(Build.VERSION.SDK_INT>= Build.VERSION_CODES.M){
            AudioAttributes audioAttributes=new AudioAttributes.Builder().
                    setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
                    .setUsage(AudioAttributes.USAGE_GAME)
                    .build();
            soundPool=new SoundPool.Builder().setAudioAttributes(audioAttributes).build();

        }
        else
            soundPool=new SoundPool(1, AudioManager.STREAM_MUSIC,0);
        sound=soundPool.load(activity,R.raw.shoot,1);
        candyX=1100;
        candyY=400;
       this.activity=activity;
        screenRatioX=1920f/screenX;
        screenRatioY=1080/screenY;
        this.screenX=screenX;
         this.screenY=screenY;
        background1=new Background(screenX,screenY,getResources());
        background2=new Background(screenX,screenY,getResources());
        flight=new FlightActivity(this,screenY,getResources());
        bullets=new ArrayList<>();
        background2.x=screenX;
        paint=new Paint();
        paint.setTextSize(50);
        paint.setColor(Color.WHITE);
        birds=new BirdActivity[4];
        for(int i=0;i<4;i++){

            BirdActivity bird=new BirdActivity(getResources());
            birds[i]=bird;
        }
      random=new Random();

    }

    @Override
    public void run() {
        while(isPlaying){
        update();
        draw();
        sleep();
        }

    }
    private void update(){//change screen position
    background1.x-=50*screenRatioX;
    background2.x-=50*screenRatioX;
    if(background1.x+background1.background.getWidth()<0){
        background1.x=screenX;
    }
        if(background2.x+background2.background.getWidth()<0){
            background2.x=screenX;
        }
        if(flight.isGoingUp)
            flight.y-=40*screenRatioY;//put the player on the top of the screen
        else
            flight.y+=40*screenRatioY;//put the player on buttom
            if(flight.y<0)
                flight.y=0;//ensure the player wont fall from the screen
       if(flight.y>screenY-flight.height)//if player is already off the screen from the buttom
           flight.y=screenY-flight.height;//
        List<BulletActivity>trash=new ArrayList<>();//bullets which are off the screen are here
        for(BulletActivity bullet:bullets){
            if(bullet.x>screenX)
                trash.add(bullet);
            bullet.x+=50*screenRatioX;//falling off the screen
            for(BirdActivity bird:birds){
                if(Rect.intersects(bird.getCollisionShape(),bullet.getCollisionShape())){
                    score++;
                    bird.x=-500;
                    bullet.x=screenX+500;
                    bird.wasShot=true;
                }
            }

        }
        for(BulletActivity bullet:trash)
            bullets.remove(bullet);//remove bullets hence they are not in need any more
        for(BirdActivity bird:birds){
            bird.x-=bird.speed;
           if(bird.x+bird.width<0){

             int bound=(int)(30*screenRatioX);
             bird.speed=random.nextInt(bound);
             if(bird.speed<10*screenRatioX)
                 if(bird.speed<10*screenRatioX)//in case the speed is zero and bird wont move
                     bird.speed=(int)(10*screenRatioX);
                 bird.x=screenX;//replace the bird
                bird.y=random.nextInt(screenY-bird.height);
                bird.wasShot=false;
            }
            if(Rect.intersects(bird.getCollisionShape(),flight.getCollisionShape())){
                isGameOver=true;
                return;

                //rectangle calculate the collision between player and biird
            }
        }
    }

    private void draw(){
   if(getHolder().getSurface().isValid()){//in case we can allocate canva
       Canvas canvas=getHolder().lockCanvas();//lock current canvas in the same position

       canvas.drawBitmap(background1.background,background1.x
               ,background1.y,paint);
       canvas.drawBitmap(background2.background,background2.x,background2.y,paint);
       candyhouse1=BitmapFactory.decodeResource(getResources(),R.drawable.candi);
      canvas.drawBitmap(candyhouse1,candyX,candyY,null);
       canvas.drawBitmap(flight.getFlight(),flight.x,flight.y,paint);
       for(BirdActivity bird:birds)
           canvas.drawBitmap(bird.getBird(),bird.x,bird.y,paint);
       canvas.drawText(getContext().getString(R.string.your_score_txt)+score+"",screenX/2f,164,paint);
       if(isGameOver){

           isPlaying=false;
          canvas.drawBitmap(flight.getDied(),flight.x,flight.y,paint);
          saveIfHighScore();
          waitBeforeExiting();
       getHolder().unlockCanvasAndPost(canvas);//draw out backgrounds on screen

       }

       canvas.drawBitmap(flight.getFlight(),flight.x,flight.y,paint);
      for(BulletActivity bullet:bullets)
          canvas.drawBitmap(bullet.bullet,bullet.x,bullet.y,paint);
     getHolder().unlockCanvasAndPost(canvas);//draw out backgrounds on screen

   }

    }

    private void waitBeforeExiting() {
        try {
            Thread.sleep(3000);
            activity.startActivity(new Intent(activity,MainActivity.class));
            activity.finish();

        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    private void saveIfHighScore() {
        if(prefs.getInt("highscore",0)<score){
            SharedPreferences.Editor editor=prefs.edit();
            editor.putInt("highscore",score);
            editor.apply();

        }
    }

    private void sleep(){

        try {
            Thread.sleep(17);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    public void resume(){
        isPlaying=true;
    thread=new Thread(this);
    thread.start();

    }
    public void pause(){
        try {
            isPlaying=false;
            thread.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch(event.getAction()){
            case MotionEvent.ACTION_DOWN://if user press button of screen
                if(event.getX()<screenX/2){//if user type in the left side of the screen
                    flight.isGoingUp=true;

                }
            break;
            case  MotionEvent.ACTION_UP://if user leave the screen
                flight.isGoingUp=false;
                if(event.getX()>screenX/2)
                    flight.toShoot++;
            break;
        }
        return true;
    }

    public void newBullet() {
        if(prefs.getBoolean("isMute",false))
            soundPool.play(sound,1,1,0,0,1);
        BulletActivity bullet=new BulletActivity(getResources());
        bullet.x=flight.x+flight.width;
        bullet.y=flight.y+(flight.height/2);
        bullets.add(bullet);
    }

    public static int getScore(){
        return score;
    }
}

package com.example.gobirdgo;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.text.NoCopySpan;

import androidx.appcompat.app.AppCompatActivity;

public class Background extends AppCompatActivity {
    int x=0,y=0;
   private GameView gameview;
   static int  score;
    Bitmap background;

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        score = GameView.getScore();

    }

    Background(int screenX, int screenY,Resources res){

        if(score>=0&&score<=10)
             background= BitmapFactory.decodeResource(res,R.drawable.forest_stage);
            else
                 background= BitmapFactory.decodeResource(res,R.drawable.stage2);

        background=Bitmap.createScaledBitmap(background,screenX,screenY,false);
    }

}

还有后台总是在做一个问题和中途插播游戏