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  [LibGDX] NullPointerException and batch  (Read 1602 times)
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Offline Cinem

Senior Newbie





« Posted 2013-05-27 01:29:43 »

Hi  Grin

I'm trying to make a simple tile mapping but I have a problem with the rendering. I have a NullPointer exception Sad

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Caused by: java.lang.NullPointerException
   at Map.render(Map.java:51)
   at .render(LabC.java:47)


I use 3 classes :
- Block => Each Tile
- Map => two dimensional "Block" array
- LabC => The main class

For rendering one Block I use this function:

Block.java:

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public void render(){
// "sprite" is a Sprite object for Texture, position ... of the Tile.
     sprite.draw(LabC.batch);
   }


To display all tiles I use this function:
Map.java
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public void render(){
      for(int y = 0;y < map.length; y++){
         for(int x =0;x < map[1].length; x++){
            blockmap[x][y].render();
         }
      }
   }


And the render method :

LaboC.java

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public static SpriteBatch batch;
...
public void render() {      
      Gdx.gl.glClearColor(0, 0, 0, 1);
      Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
      batch.setProjectionMatrix(camera.combined);
     
      batch.begin();
      test.render();
//"test" is a Map object
     batch.end();
   }


Thx for the help
Offline alaslipknot
« Reply #1 - Posted 2013-05-27 02:23:43 »

it must be an initialization problem, make sure you initialize all your variable before using them .
good luck

"It's not at all important to get it right the first time. It's vitally important to get it right the last time."
Offline Jimmt
« League of Dukes »

JGO Kernel


Medals: 128
Projects: 4
Exp: 3 years



« Reply #2 - Posted 2013-05-27 02:25:29 »

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public void render(){
// "sprite" is a Sprite object for Texture, position ... of the Tile.
     LabC.batch.begin();
      sprite.draw(LabC.batch);
      LabC.batch.end();
   }

That's your solution, I'm pretty sure. I'm not too keen on your use of statics for this, but I think that should work.
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Offline Longarmx
« Reply #3 - Posted 2013-05-27 05:06:53 »

Make sure you initialize everything in the create() method instead of statically in the class "header".

Offline ReBirth
« Reply #4 - Posted 2013-05-27 07:16:14 »

Full code of LabC class.

Offline heisenbergman

JGO Coder


Medals: 14


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« Reply #5 - Posted 2013-05-27 07:19:36 »

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public void render(){
// "sprite" is a Sprite object for Texture, position ... of the Tile.
     LabC.batch.begin();
      sprite.draw(LabC.batch);
      LabC.batch.end();
   }

That's your solution, I'm pretty sure. I'm not too keen on your use of statics for this, but I think that should work.
Would passing an instance of Map (or maybe just blockmap[][]) to LaboC so it could be rendered there be a better solution (given of course that it makes sense considering the TS's code overall)?

Offline Cinem

Senior Newbie





« Reply #6 - Posted 2013-05-27 17:57:18 »

I fix my problem !
Appently my inititalization wasn't good
Thx for the help
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