Creating a Texture from an SDCard File

Troubleshooting android
1

Hello everyone and thank you in advance for any help. I’m hoping to use jME for a project I’m working on, and the engine is fantastic so far, but I have one key technology I have not been able to prototype: Creating a Texture from an SDCard File.

I am trying to use an image from the SD card as a texture. I know it is not an issue with permissions, since I am able to open the file and read it via a FileInputStream object. My test file, test.png, exists both in the root of the internal storage and in the root of the SD Card. I am trying to use “application.getAssetManager().loadTexture(String filename)” to load the texture but keep getting an AssetNotFoundException. I have tried passing “test.png” as the filename, along with prefixing it with the string obtained from “Environment.getExternalStorageDirectory()” without success.

For completeness sake, here is the code I am using:

private void ModifyTexture(Geometry g)
{
	String fn = Environment.getExternalStorageDirectory().getAbsolutePath() + "/test.png";
	Texture tex = application.getAssetManager().loadTexture(fn);  // EXCEPTION THROWN HERE
	Material newmat = new Material(application.getAssetManager(),"Common/MatDefs/Misc/Unshaded.j3md");
    newmat.setTexture("ColorMap", tex);
	g.setMaterial(newmat);
}

This code works fine if I use a texture filename like “assets/Images/test.png”, but the idea is to use an image not in the apk.

Is it possible to create a texture from an image file on Android?

2

You’re trying to load an asset outside the default asset folder so you’ll have to register a locator first.

https://wiki.jmonkeyengine.org/legacy/doku.php/jme3:faq#why_do_i_get_assetnotfoundexception_when_loading_x
(You’re looking for the FileLocator)

3 Likes
3

Rylius! Super thank you for the correct and swift response! You rock.

For completeness sake, here’s the correct code:

[java]
private void ModifyTexture(Geometry g)
{
application.getAssetManager().registerLocator(Environment.getExternalStorageDirectory().getAbsolutePath(), FileLocator.class);
String fn = “test.png”;
Texture tex = application.getAssetManager().loadTexture(fn);
Material newmat = new Material(application.getAssetManager(),“Common/MatDefs/Misc/Unshaded.j3md”);
newmat.setTexture(“ColorMap”, tex);
g.setMaterial(newmat);
}
[/java]

4

So I have one more question related to the previous question.

I’m trying to handle the case where the texture load fails, such as when the user picks a file that is not an image or if the image is too big. I surrounded the code with a try/catch, but later the GLThread crashes with an “RuntimeException”.

[java]
try
{
Texture tex = application.getAssetManager().loadTexture(fn);

				Material newmat = new Material(application.getAssetManager(),"Common/MatDefs/Misc/Unshaded.j3md");
			    newmat.setTexture("ColorMap", tex);
				g.setMaterial(newmat);
				showLogoLoadFailed = false;
			}
			catch (IllegalStateException ee)
			{
				showLogoLoadFailed = true;
			}
			catch (AssetNotFoundException e)
			{
				showLogoLoadFailed = true;
			}

[/java]
Is there a way to recover from a failed texture load?

5

What exaclty is the runtimeException?

6

My apologies. I believe the exception i was seeing was due to slow stepping through the code.

Thank you for the quick response, and a general thank you to the jME community. I really like this engine so far!

7

Slow stepping through the code shouldn’t cause an exception really (it never has for me).

What was the exception?

8

sorry for the late response. I’ve apparently fixed the issue; it was something I wasn’t doing right. thank you again for the help, and I’m digging jME! It’s a great engine for Android.