Nullpointer exception at render

[Nanoc]

Hi, im starting with libgdx on android and im trying to do some practices, im getting this error

E/AndroidRuntime( 1592): FATAL EXCEPTION: GLThread
E/AndroidRuntime( 1592): java.lang.NullPointerException
E/AndroidRuntime( 1592):        at gdx.game.Game.render(Game.java:81)
E/AndroidRuntime( 1592):        at com.badlogic.gdx.backends.android.AndroidGrap
hics.onDrawFrame(AndroidGraphics.java:449)
E/AndroidRuntime( 1592):        at com.badlogic.gdx.backends.android.surfaceview
.GLSurfaceViewCupcake$GLThread.guardedRun(GLSurfaceViewCupcake.java:713)
E/AndroidRuntime( 1592):        at com.badlogic.gdx.backends.android.surfaceview
.GLSurfaceViewCupcake$GLThread.run(GLSurfaceViewCupcake.java:646)

Here is my code

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public class Game implements ApplicationListener {     Stage stage;     SpriteBatch spriteBatch;     muñeco pnj;     Image image;     Touchpad touchpad;     TextureRegion[] walkFrames;     float stateTime;     OrthographicCamera camera;     TextureRegion currentFrame;     Label lbl;     JoystickScreen js;     public void create() {         stage = new Stage();         Gdx.input.setInputProcessor(stage);         Skin skin = new Skin(Gdx.files.internal("data/uiskin.json"));         pnj = new muñeco(getSprites("data/sprite.png", 3, 4));         pnj.setAnims();         touchpad = new Touchpad(20, skin);         touchpad.setBounds(15, 15, 100, 100);         stage.addActor(touchpad);     }     public void render() {         Gdx.gl.glClearColor(0, 0, 0.2f, 1);         Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);         stage.act(Gdx.graphics.getDeltaTime());         stateTime += Gdx.graphics.getDeltaTime();                       // #15        if (touchpad.getKnobPercentX() > 50) {             currentFrame = pnj.walkr.getKeyFrame(stateTime, true);      // #16        }         if (touchpad.getKnobPercentX() < -50) {             currentFrame = pnj.walkl.getKeyFrame(stateTime, true);      // #16        }         if (touchpad.getKnobPercentY() > 50) {             currentFrame = pnj.walku.getKeyFrame(stateTime, true);      // #16        }         if (touchpad.getKnobPercentY() < -50) {             currentFrame = pnj.walkd.getKeyFrame(stateTime, true);      // #16        }         spriteBatch.begin();         spriteBatch.draw(currentFrame, 100, 100);                         // #17        spriteBatch.end();         stage.draw();     }     public void resize(int width, int height) {         stage.setViewport(width, height, true);     }     public void pause() {     }     public void resume() {     }     public void dispose() {         stage.dispose();     }     public void escribir(String frase) {         lbl.setText(frase);     }     public static TextureRegion[] getSprites(String filepath, int col, int fil) {         Texture walkSheet = new Texture(Gdx.files.internal(filepath));         TextureRegion[][] tmp = TextureRegion.split(walkSheet, walkSheet.getWidth() / col, walkSheet.getHeight() / fil);         TextureRegion[] walkFrames = new TextureRegion[col * fil];         int index = 0;         for (int i = 0; i < col-1; i++) {             for (int j = 0; j < fil-1; j++) {                 walkFrames[index++] = tmp[i][j];             }         }         return walkFrames;     } }

The line that gives the error is:

spriteBatch.begin();

Sorry for that dirty code, i have no idea of what im doing wrong but im sure its a really noob mistake.

Hope some help and sorry for my bad english

[Magn919]

It doesn't look like you are ever creating that SpriteBatch object, so the variable just hold a null value.

[Nanoc]

thanks that was a really stupid fail, but im still getting errors

E/AndroidRuntime( 1409): FATAL EXCEPTION: GLThread
E/AndroidRuntime( 1409): java.lang.NullPointerException
E/AndroidRuntime( 1409):        at com.badlogic.gdx.graphics.g2d.SpriteBatch.dra
w(SpriteBatch.java:730)
E/AndroidRuntime( 1409):        at gdx.game.Game.render(Game.java:67)
E/AndroidRuntime( 1409):        at com.badlogic.gdx.backends.android.AndroidGrap
hics.onDrawFrame(AndroidGraphics.java:449)
E/AndroidRuntime( 1409):        at com.badlogic.gdx.backends.android.surfaceview
.GLSurfaceViewCupcake$GLThread.guardedRun(GLSurfaceViewCupcake.java:713)
E/AndroidRuntime( 1409):        at com.badlogic.gdx.backends.android.surfaceview
.GLSurfaceViewCupcake$GLThread.run(GLSurfaceViewCupcake.java:646)

on the next line
spriteBatch.draw(currentFrame, 100, 100);

that textureregion should be ok, the getSprites() function its almost copy paste from here: http://code.google.com/p/libgdx/wiki/SpriteAnimation

Really thanks for the help and sorry for my bad english

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[Magn919]

getSprites()?
In the code you posted before currentFrame isn't being instantiated either.

Edit: by the way, you really should check your code an extra time before posting more of these NullPointerException errors, because they are often easy enough to spot,
make sure you have a clear idea where your variables is instantiated.

[ReBirth]

I dont know what happened when you give null TextureRegion for SpriteBatch to draw but since exception raised from inside, your currentFrame maybe the ebil.

NB: if you want quicker method to make this work, use that basic Game class instead ApplicationListener.

[ReBirth]

First, are you sure it compiled? muneco's Animation fields aren't public.

EDIT: You delete the post after I reply? :O

[Nanoc]

I solved it myself and ofc it compiles with that code the currentframe only initializes when i drag the touchpad, i added a default frame and it works.

Thank u very much for the help i will be in this great forum, and again sorry for my poor english i try my best