Fiz

package com.cig.fiz;

import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class K extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_k);
        EditText eT1 = (EditText) findViewById(R.id.eT1);
        EditText eT2 = (EditText) findViewById(R.id.eT2);
        TextView tV = (TextView) findViewById(R.id.textView1);
        Listener l = new Listener(eT1,eT2,tV);
        // 1.gomb
        Button gen = (Button) findViewById(R.id.button1);
        gen.setOnClickListener(l);
        //2. gomb
        Button back = (Button) findViewById(R.id.button2);
        back.setOnClickListener(l);
    }
    public class Listener implements OnClickListener{
        EditText eT1;
        EditText eT2;
        TextView tV;
        public Listener(EditText eT1,EditText eT2,TextView tV){
            this.eT1 = eT1;
            this.eT2 = eT2;
            this.tV = tV;
        }
        @Override
        public void onClick(View v) {
            //ha 1. gomb
            if(v.equals(findViewById(R.id.button1))){

                //Hogyha ír valamit az editTextek-ben
                if((eT1.getText() != null) && (eT2.getText() != null)){
                    int f = Integer.parseInt(eT1.getText().toString());
                    int t = Integer.parseInt(eT2.getText().toString());
                    if(f != t){
                        int k = (f*t)/(t - f);
                        tV.setText(k);
                    }
                }else{
                    tV.setText("Vmi nem jó");
                }
            //ha 2.gomb
            }else if(v.equals(findViewById(R.id.button2))){
                finish();
            }
        }

    }
}