صفحة تضهر لمره واحده

وضعها داخل اون كرييت

Boolean isFirstRun = getSharedPreferences("PREFERENCE", MODE_PRIVATE)
        .getBoolean("isFirstRun", true);

if (isFirstRun) {
    //show sign up activity
    startActivity(new Intent(MainActivity.this, SignUpActivity.class));
    Toast.makeText(MainActivity.this, "Run only once", Toast.LENGTH_LONG)
            .show();
}


getSharedPreferences("PREFERENCE", MODE_PRIVATE).edit()
        .putBoolean("isFirstRun", false).commit();