New steps in Android

So, I’m making an app that needs several activities, for the first time, ever… This was really nice, I found out how to make a new activity, and call it (open it).
However, there was a big twist. I needed 5 new activities, and I needed only one of them to open, based on number of filled out fields (editText).

Here is how I did it:
public class MainActivity extends AppCompatActivity {
public EditText playerOne,playerTwo,playerThree,playerFour,playerFive,playerSix;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn = findViewById(R.id.btn);
playerOne = findViewById(R.id.playerOne);
playerTwo = findViewById(R.id.playerTwo);
playerThree = findViewById(R.id.playerThree);
playerFour = findViewById(R.id.playerFour);
playerFive = findViewById(R.id.playerFive);
playerSix = findViewById(R.id.playerSix);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int filledFileds = countFilledFields();
Log.d("filled", String.valueOf(filledFileds));
Class newClass = null;
switch (filledFileds){
case 1:
Context context = getApplicationContext();
CharSequence text = "You need more players!";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
break;
case 2:
newClass = Activity2.class;
System.out.println("Activity2");
break;
case 3:
newClass = Activity3.class;
System.out.println("Activity3");
break;
case 4:
newClass = Activity4.class;
System.out.println("Activity4");
break;
case 5:
newClass = Activity5.class;
System.out.println("Activity5");
break;
case 6:
newClass = Activity6.class;
System.out.println("Activity6");
break;
default:
}
if (newClass != null) {
Intent intent = new Intent(MainActivity.this, newClass);
startActivity(intent);
}
Intent intent = new Intent(MainActivity.this, newClass);
startActivity(intent);
}
});
}
private int countFilledFields() {
ArrayList<EditText> editTexts = new ArrayList<>();
editTexts.add(playerOne);
editTexts.add(playerTwo);
editTexts.add(playerThree);
editTexts.add(playerFour);
editTexts.add(playerFive);
editTexts.add(playerSix);
int filledNumber = 0;
for(int i = 0;i < editTexts.size() ;i++){
if(editTexts.get(i).getText()!=null && !editTexts.get(i).getText().toString().matches("")){
filledNumber += 1;
}
}
return filledNumber;
}
}