android - 保存 Hash map 的 ArrayList

Question

在我的应用程序中，我想将数据保存在 savedInstanceState() .我想保存ArrayList<HashMap<String,String>> .到目前为止，我无法做到这一点。 这是困扰我的代码

@Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putParcelableArrayList("places", (ArrayList<? extends Parcelable>) places);

    }

恢复()方法

private void restore(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        //What should i do here! i have try many things but none of them is helping

    }

Answer 1

由于 ArrayList、HashMap 和 String 是Serializable，您可以使用 Bundle.putSerializable 和 Bundle.getSerializable

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putSerializable("places", places);
}

private void restore(Bundle savedInstanceState) {
    if (savedInstanceState != null) {
        places = (ArrayList<HashMap<String,String>>) savedInstanceState.getSerializable("places"); 
    }
}

此外，请确保您从 onRestoreInstanceState 或 onCreate 调用 restore