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1. }
package com.example.programa2;
importandroid.os.Bundle;
importandroid.app.Activity;
importandroid.view.Menu;
importandroid.view.View;
importandroid.widget.TextView;
publicclassMainActivityextendsActivity{
@Override
protectedvoidonCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
publicbooleanonCreateOptionsMenu(Menumenu) {
//Inflate the menu;thisaddsitemstothe actionbar if itis present.
getMenuInflater().inflate(R.menu.main,menu);
returntrue;
}
publicvoidsumar(Viewview){
EditTextet1=(EditText) findViewById(R.id.num1);
EditTextet2=(EditText) findViewById(R.id.num2);

2. TextViewsol=(TextView) findViewById(R.id.res);
double n1=Double.parseDouble(et1.getText().toString());
double n2=Double.parseDouble(et2.getText().toString());
double r;
r=n1+n2
sol.setText(String.valueOf("El resultadode"+n1+"+"+n2+"= "+r));
}
}