Multiple permissions not working about android-permissions HOT 3 CLOSED

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

String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE,
        Manifest.permission.READ_EXTERNAL_STORAGE};
Permissions.check(this, permissions, null, null, new PermissionHandler() {
    @Override
    public void onGranted() {
        try {
            File root = Environment.getExternalStorageDirectory();
            File testFile = new File(root, "test.txt");

            FileOutputStream out = new FileOutputStream(testFile);
            out.write("Hello World".getBytes());
            out.close();

            FileInputStream in = new FileInputStream(testFile);
            byte[] data = new byte[11];
            in.read(data);
            in.close();

            String message = "Read: " + new String(data);
            Toast.makeText(MainActivity.this, message, Toast.LENGTH_SHORT).show();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
});