ALERT DIALOG

Button btnNut;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnNut = (Button)findViewById(R.id.btnNut);
btnNut.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
showAlert();
}
});
}

public void showAlert(){ 
AlertDialog.Builder builder = new Builder(this);
builder.setPositiveButton("ON", new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub

}
});
builder.setTitle("Tieu de");
builder.setMessage("Noi dung ne");

AlertDialog ad = builder.create();
ad.show();
}