1-) Android Yeni -

 intent = new Intent(this, HkList.class);
intent.putExtra("ac", "1");

 

// alirken

if (getIntent().getStringExtra("ac")!=null){
    String ac = getIntent().getExtras().getString("ac");
    if(ac.equals("1")){
        Toast.makeText(this, "Açıldı", Toast.LENGTH_SHORT).show();
    }
}