How to correct what is red? [closed]

I'm a beginner and I can not fix what's in the red in the image when I switched to the changed color code but in Android Studio so

public class MainActivity extends Activity {                                 

    private ViewManager l;                                                   

    @Override                                                                
    protected void onCreate(Bundle savedInstanceState) {                     
        super.onCreate(savedInstanceState);                                  
        setContentView(R.layout.activity_main);                              


        String s = "";                                                       
        for (int i = 1; i <= 45; i +=6) {                                    
            TextView t = new TextView(this);                                 
            t.setText(s);                                                    
            l.addView(t);                                                    
        }                                                                    
        int x = 2;                                                           
        do {                                                                 
            Button b = new Button(this);                                     
            b.setText(x);                                                    
            l.addView(b);                                                    
            if (x == 7 && x == 13 && x == 19)                                
                continue;                                                    
        } while (x <= 24);                                                   


    }                                                                        
}