Android - Request Multiple Permissions

AndroidManifest.xml

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

HomeUI.java

// check for permissions
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    requestMultiplePermissions();
}

requestMultiplePermissions.java

@TargetApi(Build.VERSION_CODES.M)
private void requestMultiplePermissions() {

    // init permissions list
    List<String> permissions = new ArrayList<>();
    String[] permissionsList = new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE};

    // loop through permissions
    for (String permission : permissionsList){
        if (checkSelfPermission(permission) != PackageManager.PERMISSION_GRANTED) {
            permissions.add(permission);
        }
    }

    // if permissions list is not empty, request permission
    if (!permissions.isEmpty()) {
        requestPermissions(permissions.toArray(new String[permissions.size()]), Global.REQUEST_ALL_PERMISSIONS);
    }
}