如何保存在列表视图动态添加的项目与共享preferences？ [英] How to save dynamically added items in Listview with sharedpreferences?

问题描述

 保护无效的onCreate（捆绑savedInstanceState）{
    // TODO自动生成方法存根
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.activity_main）;    preferences = getShared preferences（FAVORI，0）;    ListView控件favlist =（ListView控件）findViewById（R.id.favoriliste）;    ArrayList的＆LT;串GT;富=新的ArrayList＆LT;串GT;（）;
    的String []巴= foo.toArray（新的String [0]）;    公共无效favekle（字符串字符串）{    foo.add（字符串）;
    巴= foo.toArray（新的String [0]）;    favadapter =新MyFavAdapter（Diziler.this，
            android.R.layout.simple_list_item_1，R.id.txtTitle，吧）;
    // favlist =新的ArrayList＆LT;＆GT;（）;
    favlist.setAdapter（favadapter）;
    favadapter.notifyDataSetChanged（）;}
    favadapter =新MyFavAdapter（Diziler.this，
            android.R.layout.simple_list_item_1，R.id.txtTitle，吧）;
    // favlist =新的ArrayList＆LT;＆GT;（）;
    favlist.setAdapter（favadapter）;
    favadapter.notifyDataSetChanged（）;
 

Hello.I需要help.I要保存列表视图动态添加的项目与共享preferences。
我添加列表视图项与公共无效favekle function.I'm项目添加到ArrayList的＆LT;>比我转换的ArrayList＆LT;>到字符串数组最后我设置项目适配器。
如果我重新启动应用程序的列表视图我的物品消失。
我如何保存与共享preferences添加的项目？我用的StringBuilder但它没有work.Thank你。<​​/ P>

解决方案

您可以存储字符串集共享preferences，然后将其转换回一个列表，当你找回它们。

 的ArrayList＆LT;串GT;名单=新的ArrayList＆LT;串GT;（）;
list.add（测试1）;
list.add（测试2）;preferenceManager.getDefaultShared preferences（上下文）
    。编辑（）
    .putStringSet（stringset，新的HashSet＆LT;串GT;（列表））
    。承诺（）;
 

        protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    preferences = getSharedPreferences(FAVORI, 0);

    ListView favlist = (ListView) findViewById(R.id.favoriliste);

    ArrayList<String> foo = new ArrayList<String>();
    String [] bar = foo.toArray(new String[0]);

    public void favekle(String string) {

    foo.add(string);
    bar = foo.toArray(new String[0]);

    favadapter = new MyFavAdapter(Diziler.this,
            android.R.layout.simple_list_item_1, R.id.txtTitle, bar);
    // favlist= new ArrayList<>();
    favlist.setAdapter(favadapter);
    favadapter.notifyDataSetChanged();

}       
    favadapter = new MyFavAdapter(Diziler.this,
            android.R.layout.simple_list_item_1, R.id.txtTitle, bar);
    // favlist= new ArrayList<>();
    favlist.setAdapter(favadapter);
    favadapter.notifyDataSetChanged();

Hello.I need help.I want save dynamically added items in Listview with SharedPreferences. I'm adding listview items with public void favekle function.I'm adding items to ArrayList<> than i convert ArrayList<> to string array finally i set items to adapter. If i restart application my listview items disappear. How can i save added items with sharedpreferences?I used StringBuilder but it didn't work.Thank you.

解决方案

You can store string sets in Shared Preferences, then convert them back to a List when you retrieve them.

ArrayList<String> list = new ArrayList<String>();
list.add("test1");
list.add("test2");

PreferenceManager.getDefaultSharedPreferences(context)
    .edit()
    .putStringSet("stringset", new HashSet<String>(list))
    .commit();

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