나는 안드로이드 스튜디오 libgdx에서 게임에 노력하고있다 그리고 나는 내 물리적 장치에서 실행 때마다 그것은 "[프로그램 응용]이 중지되었습니다"라고.실제 장치에 "[AppName] has stopped"이 있습니다. 로그 캣에서 ERROR : java.lang.NullPointerException이
나는 문제가 무엇인지 전혀 모르는 것보다 다른 내가 사용되는 이미지 (철자, 대문자)의 이름을 확인했다. 여기
10-06 12:01:51.055 21591-21627/com.jpfalmazan.ninjaassault E/AndroidRuntime: FATAL EXCEPTION: GLThread 2891
java.lang.NullPointerException
at com.jpfalmazan.ninjaassault.GameScreens.MenuScreen.<init>(MenuScreen.java:23)
at com.jpfalmazan.ninjaassault.NinjaAssault.create(NinjaAssault.java:19)
at com.badlogic.gdx.backends.android.AndroidGraphics.onSurfaceChanged(AndroidGraphics.java:275)
at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1505)
at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1240)
게임 내 코드입니다 :
package com.jpfalmazan.ninjaassault;
import com.badlogic.gdx.Game;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.jpfalmazan.ninjaassault.GameScreens.MenuScreen;
public class NinjaAssault extends Game {
public SpriteBatch batch;
Texture img;
@Override
public void create() {
batch = new SpriteBatch();
this.setScreen(new MenuScreen(this)); ////This is the "NinjaAssault.java:19 " error shown in logcat
}
@Override
public void render() {
super.render();
Gdx.gl.glClearColor(1,0,0,1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
batch.begin();
}
@Override
public void dispose() {
batch.dispose();
img.dispose();
}
}
그리고 여기 MenuScreen 클래스 내 코드입니다 :
package com.jpfalmazan.ninjaassault.GameScreens;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Screen;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.jpfalmazan.ninjaassault.NinjaAssault;
public class MenuScreen implements Screen{
NinjaAssault game;
public MenuScreen (NinjaAssault game){
this.game = game;
}
public SpriteBatch batch;
public Texture background;
public Texture title;
public Texture playButtonINACTIVE;
public Texture playButtonACTIVE;
public float screenWidth = Gdx.graphics.getWidth();
public float screenHeight = Gdx.graphics.getHeight();
public float titleWidth = title.getWidth(); //This is the "MenuScreen.java:23" error shown in logcat
public float titleHeight = title.getHeight();
public float xLimit1 = (float) ((screenWidth/2)-(titleWidth/2));
public float xLimit2 = (float) ((screenWidth/2)+(titleWidth/2));
public float yLimit1 = (float) ((screenHeight*.35));
public float yLimit2 = (float) ((screenHeight*.35)+titleHeight);
@Override
public void show() {
batch = new SpriteBatch();
background = new Texture("BGYELL.png");
title = new Texture ("BGASTRO.png");
playButtonINACTIVE = new Texture("BTPLAY.png");
playButtonACTIVE = new Texture("BTPLAYON.png");
}
@Override
public void render(float delta) {
Gdx.gl.glClearColor(1,0,0,1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
game.batch.begin();
game.batch.draw(background,0,0,screenWidth,screenHeight);
if((Gdx.input.getX()> xLimit1 && Gdx.input.getX() < xLimit2) && (Gdx.input.getY() < yLimit2 && Gdx.input.getY() > yLimit1)){
game.batch.draw(playButtonACTIVE,(screenWidth/2)-(playButtonACTIVE.getWidth()/2), (float) (screenHeight*.35));
}else game.batch.draw(playButtonINACTIVE,(screenWidth/2)-(playButtonINACTIVE.getWidth()/2), (float) (screenHeight*.35));
game.batch.draw(title,(screenWidth/2)-((float)(screenWidth*.8)/2), (float) (screenHeight*.65),(float)(screenWidth*.8) , (float) ((screenWidth*.8)*(titleHeight/titleWidth)));
game.batch.end();
}
@Override
public void resize(int width, int height) {
}
@Override
public void pause() {
}
@Override
public void resume() {
}
@Override
public void hide() {
}
@Override
public void dispose() {
}
}
이
내가 로그 캣에서받은 오류입니다
당신은 할당되지 않은 인스턴스 변수에 대한 메소드를 호출 할 수 없습니다. 'title' 내가 그런 실수는 쉽게 간과 할 수 있도록 내가 자바 프로그래밍 초보자입니다 말했듯이 분명 –
null입니다. 응답 주셔서 감사합니다. – JAlmazan