Toast.matkText才会创建一个新的实例
private Toast toast = null;
private void checkToastResult() {
if (toast != null) {
toast.setText("没有搜索结果");
toast.setDuration(Toast.LENGTH_SHORT);
} else {
toast = Toast.makeText(context, "没有搜索结果", Toast.LENGTH_SHORT);
}
toast.show();
}