Como criar as ações do Buttons  no Android?
Autor: Bruno Couty | Publicado: 2014-01-03T04:16:00-08:00

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Primeiro, declaramos o(s) objeto(s) necessário(s):



Button btnAcao;



Depois, dentro do método “OnCreate”, da Activity, damos&nbsp; a ele a referência de um botão (id) que
esteja no layout:



btnAcao = (Button)findViewById(R.id.idDoBotao);



Aí, não tem segredo, é só criar um método para executar
quando o botão for clicado:



btnAcao.setOnClickListener(new
OnClickListener() {

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; @Override

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; public void onClick(View v)
{

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; exibirAlert(“Botão”,”Este botão foi clicado!”);

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; });

public void exibirAlert(String titulo,
String mensagem){

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; AlertDialog.Builder msg
= new AlertDialog.Builder(MainActivity.this);

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; msg.setTitle(titulo);

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; msg.setMessage(mensagem);

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; msg.setNeutralButton("Ok",null);

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; msg.show();
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }