Calculadora

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package com.example.calculadora;

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

public class MainActivity extends Activity {
 Button somar;
 EditText edNum1, edNum2, tResult;
 double num1, num2, resultado;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        edNum1 = (EditText) findViewById(R.id.et1);
        edNum2 = (EditText) findViewById(R.id.ed2);        
        somar = (Button) findViewById(R.id.btsoma);
       
        tResult = (EditText) findViewById(R.id.etresult);
        
        somar.setOnClickListener(new View.OnClickListener(){
         public void onClick(View v){
          num1 = Double.parseDouble(edNum1.getText().toString());
          num2 = Double.parseDouble(edNum2.getText().toString());
          tResult.setText(String.valueOf(num1 * num2 / 2));
         }
         
        });
        
        
        
        }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
}