Create StorageHelper, and redesign BookmarksActivity (II)

/*

 * Copyright (C) 2012 The CyanogenMod Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.cyanogenmod.explorer.util;

import android.content.Context;

import android.os.Environment;

import android.os.storage.StorageManager;

import android.os.storage.StorageVolume;

import com.cyanogenmod.explorer.R;

import java.io.File;

import java.lang.reflect.Method;

/**

 * A helper class with useful methods for deal with storages.

 */

public final class StorageHelper {

    /**

     * Method that returns the storage volumes defined in the system.  This method uses

     * reflection to retrieve the method because CM10 has a {@link Context}

     * as first parameter, that AOSP hasn't.

     * 

     * @param ctx The current context

     * @return StorageVolume[] The storage volumes defined in the system

     */

    public static StorageVolume[] getStorageVolumes(Context ctx) {

        //IMP!! Android SDK doesn't have a "getVolumeList" but is supported by CM10.

        //Use reflect to get this value (if possible)

        try {

            StorageManager sm = (StorageManager) ctx.getSystemService(Context.STORAGE_SERVICE);

            Method method = sm.getClass().getMethod("getVolumeList"); //$NON-NLS-1$

            return (StorageVolume[])method.invoke(sm);

        } catch (Exception ex) {

            //Ignore. Android SDK StorageManager class doesn't have this method

            //Use default android information from environment

            try {

                File externalStorage = Environment.getExternalStorageDirectory();

                String path = externalStorage.getCanonicalPath();

                String description = null;

                if (path.toLowerCase().indexOf("usb") != -1) { //$NON-NLS-1$

                    description = ctx.getString(R.string.usb_storage);

                } else {

                    description = ctx.getString(R.string.external_storage);

                }

                StorageVolume sv =new StorageVolume(path, description, false, false, 0, false, 0);

                return new StorageVolume[]{sv};

            } catch (Exception ex2) {

                /**NON BLOCK**/

            }

        }

        return new StorageVolume[]{};

    }

    /**

     * Method that returns the storage volume description. This method uses

     * reflection to retrieve the description because CM10 has a {@link Context}

     * as first parameter, that AOSP hasn't.

     *

     * @param ctx The current context

     * @param volume The storage volume

     * @return String The description of the storage volume

     */

    public static String getStorageVolumeDescription(Context ctx, StorageVolume volume) {

        try {

            Method method = volume.getClass().getMethod(

                                            "getDescription", //$NON-NLS-1$

                                            new Class[]{Context.class});

            if (method == null) {

                // AOSP

                method = volume.getClass().getMethod("getDescription"); //$NON-NLS-1$

                return (String)method.invoke(volume);

            }

            // CM10

            return (String)method.invoke(volume, ctx);

        } catch (Throwable _throw) {

            // Returns the volume storage path

            return volume.getPath();

        }

    }

}