eu.mhutti1.utils.storage.StorageDeviceUtils.java Source code

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Here is the source code for eu.mhutti1.utils.storage.StorageDeviceUtils.java

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/*
 * Copyright 2016 Isaac Hutt <mhutti1@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU  General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 */

package eu.mhutti1.utils.storage;

import android.annotation.TargetApi;
import android.app.Activity;
import android.app.FragmentManager;
import android.content.Context;
import android.os.Build;
import android.os.Environment;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.accessibility.AccessibilityRecordCompat;
import android.util.Log;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;
import java.util.ArrayList;
import java.util.regex.Matcher;

import static android.R.attr.path;
import static java.lang.Math.abs;

public class StorageDeviceUtils {
    private static ArrayList<StorageDevice> mStorageDevices;

    public static ArrayList<StorageDevice> getStorageDevices(Context context, boolean writable) {
        mStorageDevices = new ArrayList<>();

        // Add as many possible mount points as we know about

        // Only add this device if its very likely that we have missed a users sd card
        if (Environment.isExternalStorageEmulated()) {
            // This is our internal storage directory
            mStorageDevices.add(new StorageDevice(
                    generalisePath(Environment.getExternalStorageDirectory().getPath(), writable), true));
        } else {
            // This is the internal directory of our app that only we can write to
            mStorageDevices.add(new StorageDevice(context.getFilesDir().getPath(), true));
            // This is an external storage directory
            mStorageDevices.add(new StorageDevice(
                    generalisePath(Environment.getExternalStorageDirectory().getPath(), writable), false));
        }

        // These are possible manufacturer sdcard mount points

        String[] paths = ExternalPaths.getPossiblePaths();

        for (String path : paths) {
            if (path.endsWith("*")) {
                File root = new File(path.substring(0, path.length() - 1));
                File[] directories = root.listFiles(new FileFilter() {
                    @Override
                    public boolean accept(File file) {
                        return file.isDirectory();
                    }
                });
                if (directories != null) {
                    for (File dir : directories) {
                        mStorageDevices.add(new StorageDevice(dir, false));
                    }
                }
            } else {
                mStorageDevices.add(new StorageDevice(path, false));
            }
        }

        // Iterate through any sdcards manufacturers may have specified in Kitkat+ and add them
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            for (File file : context.getExternalFilesDirs("")) {
                if (file != null) {
                    mStorageDevices.add(new StorageDevice(generalisePath(file.getPath(), writable), false));
                }
            }
        }

        // Check all devices exist, we can write to them if required and they are not duplicates
        return checkStorageValid(writable);
    }

    // Remove app specific path from directories so that we can search them from the top
    public static String generalisePath(String path, boolean writable) {
        if (writable) {
            return path;
        }
        int endIndex = path.lastIndexOf("/Android/data/");
        if (endIndex != -1) {
            return path.substring(0, endIndex);
        }
        return path;
    }

    private static ArrayList<StorageDevice> checkStorageValid(boolean writable) {
        ArrayList<StorageDevice> activeDevices = new ArrayList<>();
        ArrayList<StorageDevice> devicePaths = new ArrayList<>();
        ArrayList<Long> sizes = new ArrayList<>();
        for (StorageDevice device : mStorageDevices) {
            File devicePath = device.getPath();
            // Only return paths that exist, are directories, are writable (if required) and are not duplicates
            if (devicePath.exists() && devicePath.isDirectory() && (canWrite(devicePath) || !writable)
                    && !device.isDuplicate() && !devicePaths.contains(devicePath)) {
                activeDevices.add(device);
                devicePaths.add(device);
                sizes.add(device.getTotalBytes());
            }
        }
        return activeDevices;
    }

    // Amazingly file.canWrite() does not always return the correct value
    private static boolean canWrite(File file) {
        try {
            RandomAccessFile randomAccessFile = new RandomAccessFile(file + "/test.txt", "rw");
            FileChannel fileChannel = randomAccessFile.getChannel();
            FileLock fileLock = fileChannel.lock();
            fileLock.release();
            fileChannel.close();
            randomAccessFile.close();
            return true;
        } catch (Exception ex) {
            return false;
        }
    }
}