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1. HOLA MUNDO (CODIFICACION)
package com.example.holamundo;
importandroid.os.Bundle;
importandroid.app.Activity;
importandroid.view.Menu;
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;
}
}

2. PROGRAMA 2 (CODIFICACION)
package com.example.programa2;
importandroid.os.Bundle;
importandroid.app.Activity;
importandroid.view.Menu;
importandroid.view.View;
importandroid.widget.TextView;
publicclass MainActivityextendsActivity{
@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);
TextViewsol=(TextView) findViewById(R.id.res);

3. 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));
}
}