SDModelManager.java

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package jarmos.app.io;

import jarmos.app.Const;
import jarmos.io.FileModelManager;

import java.io.File;
import java.io.IOException;

import android.content.Context;
import android.os.Environment;
import android.util.Log;

public class SDModelManager extends FileModelManager {

    private static final String JARMOSA_SD_DIR = "jarmosa_models";

    public static final String SD_BASE_DIR = Environment.getExternalStorageDirectory().toString();

    public static final String SD_MODEL_DIR = SD_BASE_DIR + File.separator + JARMOSA_SD_DIR;

    private DexHelper dh;

    public SDModelManager(Context c) {
        super(SD_MODEL_DIR);
        dh = new DexHelper(c);
    }

    @Override
    public ClassLoader getClassLoader() {
        try {
            return dh.getDexClassLoader(getInStream(Const.DEX_CLASSES_JARFILE));
        } catch (IOException e) {
            Log.e("SDModelManager", "I/O Exception during input stream creation for file " + Const.DEX_CLASSES_JARFILE
                    + " in model " + getModelDir() + ", loading from SD card", e);
            e.printStackTrace();
            return null;
        }
    }

    public static boolean ensureSDDir() {
        File f = new File(SD_MODEL_DIR);
        if (!f.exists())
            return f.mkdirs();
        return true;
    }

    @Override
    protected String getLoadingMessage() {
        return "Reading SD card models";
    }
}