Question

I am using the following code to set an image from the assets folder.

Uri numBgUri = Uri.parse("file:///android_asset/background_numbers.png");
numBgImage.setImageURI(numBgUri);

The background_numbers.png file definitely exists in the assets root directory. I am getting a FileNotFoundException in the log: –

09-23 17:05:23.803: WARN/ImageView(23713): Unable to open content: file:///android_asset/background_numbers.png

Any ideas what I could be doing wrong?

Thanks!

Answer 1

I managed to get a viable workaround for this using my own custom ContentProvider (It’s easier than you think!). Thanks to skink on Google Groups for the tip

This code should work, you just need to set a provider URL and register it as a provider in the manifest file

package sirocco.widgets;

import java.io.FileNotFoundException;
import java.io.IOException;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import android.database.Cursor;
import android.net.Uri;

public class AssetContentProvider extends ContentProvider {

    private AssetManager mAssetManager;
    public static final Uri CONTENT_URI = 
            Uri.parse("content://your.provider.name");

    @Override
    public int delete(Uri arg0, String arg1, String[] arg2) {
        return 0;
    }

    @Override
    public String getType(Uri uri) {
        return null;
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        return null;
    }

    @Override
    public boolean onCreate() {
        mAssetManager = getContext().getAssets();
        return true;
    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
        return null;
    }

    @Override
    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
        return 0;
    }

    @Override
    public AssetFileDescriptor openAssetFile(Uri uri, String mode) throws FileNotFoundException {
        String path = uri.getPath().substring(1);
        try {
            AssetFileDescriptor afd = mAssetManager.openFd(path);
            return afd;
        } catch (IOException e) {
            throw new FileNotFoundException("No asset found: " + uri);
        }
    }

}

I hope this helps any googlers out there with the same problem!