Android解决dialog弹出时无法捕捉Activity的back事件的方法

selectDialog.setOnCancelListener(new OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
// TODO Auto-generated method stub
// Toast.makeText(getBaseContext(), "点击了back", Toast.LENGTH_SHORT).show();
}
});

selectDialog.setOnKeyListener(new OnKeyListener() {
@Override
public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if(keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount()==0)
{
dialog.dismiss();
}
return false;
}
});
public boolean dispatchKeyEvent(KeyEvent event)
{
switch(event.getKeyCode())
{
case KeyEvent.KEYCODE_BACK:
Toast.makeText(getBaseContext(), "点击了back", Toast.LENGTH_SHORT).show();
break;
default:
break;
}
return super.dispatchKeyEvent(event);
}