android - close app if user not granting WRITE_EXTERNAL_STORAGE permission

Question

in android 6 or above when user open app first time ask him for some permission if he dont allow then exit app

some must required permission for my app is read and write to external storage, how to achieve this

i tried this

if (Build.VERSION.SDK_INT >= 23) {
                if (ContextCompat.checkSelfPermission(LoginActivity.this, android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
                        != PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(LoginActivity.this, android.Manifest.permission.READ_EXTERNAL_STORAGE)
                        != PackageManager.PERMISSION_GRANTED) {
                    ActivityCompat.requestPermissions(LoginActivity.this,
                            new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE, android.Manifest.permission.READ_EXTERNAL_STORAGE},
                            1);
                } else {
                    //do something
                }
            } else {
                    //do something
            }

Answer 1

using suggestion from @G. Brisida - Lince

i solved it and i am writing my answer here for other peoples if they need same thing,

this all code i write in MainActivity:

    if(Build.VERSION.SDK_INT >= 23)
            {
                if (ContextCompat.checkSelfPermission(MainActivity.this,Manifest.permission.WRITE_EXTERNAL_STORAGE)
                                                        != PackageManager.PERMISSION_GRANTED ||
                    ContextCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.READ_EXTERNAL_STORAGE)
                                                        != PackageManager.PERMISSION_GRANTED)
                {
     ActivityCompat.requestPermissions(MainActivity.this,
                                new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE, android.Manifest.permission.READ_EXTERNAL_STORAGE},
                                1);
    }
                else
                {
                    //do something
                }
            }
}

and this is override method onRequestPermissionsResult:

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        switch(requestCode)
        {
            case 1:
                if (grantResults.length > 0  && grantResults[0] == PackageManager.PERMISSION_GRANTED)
                {
                     // i am creating folder in external storage here
                 File create_dir=new File(Environment.getExternalStorageDirectory()+"/uca/");

                 Toast.makeText(this,"creating",Toast.LENGTH_LONG).show();
                 create_dir.mkdirs();

                }
                else
                {
                    closeNow();
                }
                break;
        }
    }

this is close now mthod :

private void closeNow() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN)
        {
            finishAffinity();
        }

        else
        {
            finish();
        }
    }