NullPointerException ist Java beim Versuch, mit libgdx zu animieren

Question

Ich bekomme eine NullPointerException, wenn ich versuche, meinen Player zu erstellen und ihn zu animieren. Ich verstehe nicht wirklich was falsch ist. Hier ist der Code:

package com.sheep.game.Sprites; 

import com.badlogic.gdx.Gdx; 
import com.badlogic.gdx.graphics.Texture; 
import com.badlogic.gdx.graphics.g2d.Animation; 
import com.badlogic.gdx.graphics.g2d.Sprite; 
import com.badlogic.gdx.graphics.g2d.TextureRegion; 
import com.sheep.game.Screens.PlayScreen; 

public class Player extends Sprite { 

    float elapsedTime = 0; 

    public Animation<TextureRegion> animation; 
    public Texture sheepLoop2; 
    TextureRegion[] animationFrames; 

    public Sprite spr_player; 

    private PlayScreen screen; 

    public Player(PlayScreen screen) { 

     this.screen = screen; 

     sheepLoop2 = new Texture("sheepLoop2.png"); 

     TextureRegion[][] frames = TextureRegion.split(sheepLoop2, 33, 21); 

     animationFrames = new TextureRegion[2]; 
     int index = 0; 

     for(int i = 0; i < 1; i++) { 
      for(int j = 0; j < 1; j++) { 
       animationFrames[index++] = frames[j][i]; 
      } 
     } 

     animation = new Animation<TextureRegion>(1f/30f, animationFrames); 

     spr_player = new Sprite(sheepLoop2); 



    } 

    public void update() { 

     spr_player.setX(10); 
     spr_player.setY(100); 
     spr_player.setRegion(animation.getKeyFrame(elapsedTime,true)); 

    } 

    public void render() { 

     elapsedTime += Gdx.graphics.getDeltaTime(); 

    } 

    public Texture getSheepLoop2() { 
     return sheepLoop2; 
    } 
} 

Und die Stacktrace ist:

Exception in thread "LWJGL Application" java.lang.NullPointerException 
    at com.badlogic.gdx.graphics.g2d.TextureRegion.setRegion(TextureRegion.java:112) 
    at com.sheep.game.Sprites.Player.update(Player.java:53) 
    at com.sheep.game.Screens.PlayScreen.update(PlayScreen.java:61) 
    at com.sheep.game.Screens.PlayScreen.render(PlayScreen.java:84) 
    at com.badlogic.gdx.Game.render(Game.java:46) 
    at com.sheep.game.SheepGame.render(SheepGame.java:28) 
    at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:225) 
    at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:126) 

Answer 1

animationFrames = new TextureRegion[2]; // having size 2 array initialisation not TextureRegion 

for(int i = 0; i < 1; i++) { 
    for(int j = 0; j < 1; j++) { 
     animationFrames[index++] = frames[j][i]; //run once according to your condition 
    } 
} 

von oben Schleife nur Sie ersten Index initialisieren, nachdem Schleife animationFrames[1] null ist

Ausnahme hier

animation.getKeyFrame(elapsedTime,true) //return second TextureRegion that is still null 

Einstellung null TextureRegion bis Sprite.

spr_player.setRegion(animation.getKeyFrame(elapsedTime,true)); 

EDIT

Wenn beide Sprite Rahmen horizontal

for(int i = 0; i < 1; i++) { 
    for(int j = 0; j < 2; j++) { 
     animationFrames[index++] = frames[i][j]; 
    } 
}