Libgdx中的TextureRegion.split方法的问题

import com.badlogic.gdx.ApplicationListener;

import com.badlogic.gdx.Gdx;

import com.badlogic.gdx.graphics.GL10;

import com.badlogic.gdx.graphics.Texture;

import com.badlogic.gdx.graphics.g2d.Animation;

import com.badlogic.gdx.graphics.g2d.SpriteBatch;

import com.badlogic.gdx.graphics.g2d.TextureRegion;



public class SpriteAnimation implements ApplicationListener {



	private static final int FRAME_COLS = 6;  

	private static final int FRAME_ROWS = 5;  



	Animation walkAnimation;  

	Texture walkSheet; 

	TextureRegion[] walkFrames; 

	SpriteBatch spriteBatch; 

	TextureRegion currentFrame; 

	TextureRegion[][] tmp;

	float stateTime; 

					

	@Override

	public void create() {

		walkSheet = new Texture(Gdx.files.internal("data/animation_sheet.png")); //图片宽，高都要是2的整数幂次方才行

		

		tmp = TextureRegion.split(walkSheet, 

				(Integer)(walkSheet.getWidth()/ FRAME_COLS),

				(Integer)(walkSheet.getHeight() / FRAME_ROWS)); 

		

		

		walkFrames = new TextureRegion[FRAME_COLS * FRAME_ROWS];

		int index = 0;

		for (int i = 0; i < FRAME_ROWS; i++) {

			for (int j = 0; j < FRAME_COLS; j++) {

				walkFrames[index++] = tmp[i][j];

			}

		}

		walkAnimation = new Animation(3f, walkFrames); 

		spriteBatch = new SpriteBatch(); 

		stateTime = 0f;	



	}



	@Override

	public void dispose() {

		// TODO Auto-generated method stub



	}



	@Override

	public void pause() {

		// TODO Auto-generated method stub



	}



	@Override

	public void render() {

		Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT); 

        stateTime += Gdx.graphics.getDeltaTime();                       

        currentFrame = walkAnimation.getKeyFrame(stateTime, true);      

        

		spriteBatch.begin();

        spriteBatch.draw(currentFrame, 50, 50);             

        spriteBatch.end();

        

	}



	@Override

	public void resize(int arg0, int arg1) {

		// TODO Auto-generated method stub



	}



	@Override

	public void resume() {

		// TODO Auto-generated method stub



	}



}

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