How to add multiple permission in Android 6 and test in Emulator?

Question

I am making an application which allows to automatically add the permission for Android 6.0 and Android M. My permission include

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

I used below code to add permission for Android 6.0 version

public static final int REQUEST_ID_MULTIPLE_PERMISSIONS = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    if(checkAndRequestPermissions()) {
        Log.d ("TAG", "Permissions are granted");
    }
}

private  boolean checkAndRequestPermissions() {
    if (Build.VERSION.SDK_INT >= 23) {
        int permissionSTORAGE  = ContextCompat.checkSelfPermission(this,
                Manifest.permission.WRITE_EXTERNAL_STORAGE);
        int permissionRECORDAUDIO  = ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO);
        List<String> listPermissionsNeeded = new ArrayList<>();
        if (permissionSTORAGE != PackageManager.PERMISSION_GRANTED) {
            listPermissionsNeeded.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
        }
        if (permissionRECORDAUDIO != PackageManager.PERMISSION_GRANTED) {
            listPermissionsNeeded.add(Manifest.permission.RECORD_AUDIO);
        }
        if (!listPermissionsNeeded.isEmpty()) {
            ActivityCompat.requestPermissions(this, listPermissionsNeeded.toArray(new String[listPermissionsNeeded.size()]), REQUEST_ID_MULTIPLE_PERMISSIONS);
            return false;
        }
        return true;
    }
    else
        return true;
}}

I have two issues in above code.

1. Is it possible to check permission in Emulator (Android M, SDK 24)?
2. Is my implementation correct? I don't have real device, so I cannot confirm above code.