Simple Android Arithmetic

Layout interface:

Code for the layout interface:

Java code:

The answer is displayed when you click the button:

public class Mainactivity extends Appcompatactivity {
private int a,b,c,ty;
Private TextView TV;
Private Button Show,next;
@Override
protected void OnCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
Setcontentview (R.layout.activity_main);
tv= (TextView) Findviewbyid (R.ID.TEXTVIEW2);
Show = (Button) Findviewbyid (R.id.button1);
Next = (Button) Findviewbyid (R.id.button2);
SZ ();
SW ();
Show answers when you click the Answer button
Show.setonclicklistener (New View.onclicklistener () {
@Override
public void OnClick (View v) {
Switch (ty) {
Case 0:
Tv.settext (A + "+" + B + "=" + (A + b));
Break
Case 1:
Tv.settext (A + "-" + B + "=" + (a));
Break
Case 2:
Tv.settext (A + "+" + B + "*" + c + "=" + (a+b*c));
Break
Case 3:
Tv.settext (A + "+" + B + "/" + c + "=" + (a+b/c));
Break
Case 4:
Tv.settext (A + "-" + B + "*" + c + "=" + (a-b*c));
Break
Case 5:
Tv.settext (A + "-" + B + "/" + c + "=" + (a-b/c));
Break
Case 6:
Tv.settext (A + "*" + B + "=" + (a*b));
Break
Case 7:
Tv.settext (A + "/" + B + "=" + (A/b));
Break
}
}
});

Click to display the next question:

Click on the question
    Next.setonclicklistener (New View.onclicklistener () {
        @Override
        public void OnClick (View v) {
            SZ ();
            SW ();
        }
    });
}

Generate random Number:

Generate random numbers
private void sz () {
    Random random = new random ();
    Random.nextint ();
    A = Random.nextint (100);
    b = random.nextint (100);
    c = random.nextint (100);
    ty = Random.nextint (8);
}

Show Title:

//Display title 
 private void SW () {
 switch (ty) {
 Case 0: 
 Tv.settext (A + ") + "+ B +" = "+"? "); 
 break; 
 Case 1: 
 Tv.settext (A + "-" + B + "=" + "?"); 
 break; 
 Case 2: 
 Tv.settext (A + "+" + B + "*" + c + "=" + "?"); 
 break; 
 Case 3: 
 Tv.settext (A + "+" + B + "/" + c + "=" + "?"); 
 break; 
 Case 4: 
 Tv.settext (A + "-" + B + "*" + c + "=" + "?"); 
 break; 
 Case 5: 
 Tv.settext (A + "-" + B + "/" + c + "=" + "?"); 
 break; 
 Case 6: 
 Tv.settext (A + "*" + B + "=" + "?"); 
 break; 
 Case 7: 
 Tv.settext (A + "/" + B + "=" + "?"); 
 break; 
} 
} 
} 

Simple Android Arithmetic