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Create DirectoryUtils.java

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Austin Huang 2020-09-20 21:41:53 -04:00
parent 2ffee347f0
commit c361bc8550
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app/src/main/java/awais/instagrabber/utils/DirectoryUtils.java Normal file
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package awais.instagrabber.utils;
import android.os.Build;
import android.os.Environment;
import java.io.File;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.regex.Pattern;
public class DirectoryUtils {
private static final Pattern DIR_SEPORATOR = Pattern.compile("/");
/**
* From: https://stackoverflow.com/a/18871043/1436766
*
* Returns all available SD-Cards in the system (include emulated)
* <p>
* Warning: Hack! Based on Android source code of version 4.3 (API 18)
* Because there is no standard way to get it.
* TODO: Test on future Android versions 4.4+
*
* @return paths to all available SD-Cards in the system (include emulated)
*/
public static Set<String> getStorageDirectories() {
// Final set of paths
final Set<String> rv = new HashSet<>();
// Primary physical SD-CARD (not emulated)
final String rawExternalStorage = System.getenv("EXTERNAL_STORAGE");
// All Secondary SD-CARDs (all exclude primary) separated by ":"
final String rawSecondaryStoragesStr = System.getenv("SECONDARY_STORAGE");
// Primary emulated SD-CARD
final String rawEmulatedStorageTarget = System.getenv("EMULATED_STORAGE_TARGET");
if (TextUtils.isEmpty(rawEmulatedStorageTarget)) {
// Device has physical external storage; use plain paths.
if (TextUtils.isEmpty(rawExternalStorage)) {
// EXTERNAL_STORAGE undefined; falling back to default.
rv.add("/storage/sdcard0");
} else {
rv.add(rawExternalStorage);
}
} else {
// Device has emulated storage; external storage paths should have
// userId burned into them.
final String rawUserId;
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR1) {
rawUserId = "";
} else {
final String path = Environment.getExternalStorageDirectory().getAbsolutePath();
final String[] folders = DIR_SEPORATOR.split(path);
final String lastFolder = folders[folders.length - 1];
boolean isDigit = false;
try {
Integer.valueOf(lastFolder);
isDigit = true;
} catch (NumberFormatException ignored) {
}
rawUserId = isDigit ? lastFolder : "";
}
// /storage/emulated/0[1,2,...]
if (TextUtils.isEmpty(rawUserId)) {
rv.add(rawEmulatedStorageTarget);
} else {
rv.add(rawEmulatedStorageTarget + File.separator + rawUserId);
}
}
// Add all secondary storages
if (!TextUtils.isEmpty(rawSecondaryStoragesStr)) {
// All Secondary SD-CARDs splited into array
final String[] rawSecondaryStorages = rawSecondaryStoragesStr.split(File.pathSeparator);
Collections.addAll(rv, rawSecondaryStorages);
}
return rv;
}
}