I have an ArrayList with custom objects. Each custom object contains a variety of strings and numbers. I need the array to stick around even if the user leaves the activity and then wants to come back at a later time, however I don't need the array available after the application has been closed completely. I save a lot of other objects this way by using the SharedPreferences but I can't figure out how to save my entire array this way. Is this possible? Maybe SharedPreferences isn't the way to go about this? Is there a simpler method?
当前回答
你可以使用Gson库保存字符串和自定义数组列表。
首先你需要创建一个函数来保存数组列表到SharedPreferences。
public void saveListInLocal(ArrayList<String> list, String key) {
SharedPreferences prefs = getSharedPreferences("AppName", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
Gson gson = new Gson();
String json = gson.toJson(list);
editor.putString(key, json);
editor.apply(); // This line is IMPORTANT !!!
}
你需要创建一个函数来从SharedPreferences获取数组列表。
public ArrayList<String> getListFromLocal(String key)
{
SharedPreferences prefs = getSharedPreferences("AppName", Context.MODE_PRIVATE);
Gson gson = new Gson();
String json = prefs.getString(key, null);
Type type = new TypeToken<ArrayList<String>>() {}.getType();
return gson.fromJson(json, type);
}
如何调用保存和检索数组列表函数。
ArrayList<String> listSave=new ArrayList<>();
listSave.add("test1"));
listSave.add("test2"));
saveListInLocal(listSave,"key");
Log.e("saveArrayList:","Save ArrayList success");
ArrayList<String> listGet=new ArrayList<>();
listGet=getListFromLocal("key");
Log.e("getArrayList:","Get ArrayList size"+listGet.size());
不要忘记在你的应用级别build.gradle中添加gson库。
实现“com.google.code.gson: gson: 2.8.2”
其他回答
还有Kotlin:
fun SharedPreferences.Editor.putIntegerArrayList(key: String, list: ArrayList<Int>?): SharedPreferences.Editor {
putString(key, list?.joinToString(",") ?: "")
return this
}
fun SharedPreferences.getIntegerArrayList(key: String, defValue: ArrayList<Int>?): ArrayList<Int>? {
val value = getString(key, null)
if (value.isNullOrBlank())
return defValue
return ArrayList (value.split(",").map { it.toInt() })
}
您可以将其转换为JSON字符串,并将字符串存储在SharedPreferences中。
下面的代码是公认的答案,为新手(我)多写几行,例如。说明了如何将set类型对象转换回arrayList,并提供了关于`之前操作的附加指导。putStringSet'和。getstringset '。(谢谢你邪恶)
// shared preferences
private SharedPreferences preferences;
private SharedPreferences.Editor nsuserdefaults;
// setup persistent data
preferences = this.getSharedPreferences("MyPreferences", MainActivity.MODE_PRIVATE);
nsuserdefaults = preferences.edit();
arrayOfMemberUrlsUserIsFollowing = new ArrayList<String>();
//Retrieve followers from sharedPreferences
Set<String> set = preferences.getStringSet("following", null);
if (set == null) {
// lazy instantiate array
arrayOfMemberUrlsUserIsFollowing = new ArrayList<String>();
} else {
// there is data from previous run
arrayOfMemberUrlsUserIsFollowing = new ArrayList<>(set);
}
// convert arraylist to set, and save arrayOfMemberUrlsUserIsFollowing to nsuserdefaults
Set<String> set = new HashSet<String>();
set.addAll(arrayOfMemberUrlsUserIsFollowing);
nsuserdefaults.putStringSet("following", set);
nsuserdefaults.commit();
您还可以将数组列表转换为String并优先保存
private String convertToString(ArrayList<String> list) {
StringBuilder sb = new StringBuilder();
String delim = "";
for (String s : list)
{
sb.append(delim);
sb.append(s);;
delim = ",";
}
return sb.toString();
}
private ArrayList<String> convertToArray(String string) {
ArrayList<String> list = new ArrayList<String>(Arrays.asList(string.split(",")));
return list;
}
您可以使用convertToString方法将数组列表转换为字符串后保存它,并使用convertToArray方法检索字符串并将其转换为数组
在API 11之后,你可以直接保存设置到SharedPreferences !!:)
这就是你的完美解决方案。试一试,
public void saveArrayList(ArrayList<String> list, String key){
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);
SharedPreferences.Editor editor = prefs.edit();
Gson gson = new Gson();
String json = gson.toJson(list);
editor.putString(key, json);
editor.apply(); // This line is IMPORTANT !!!
}
public ArrayList<String> getArrayList(String key){
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);
Gson gson = new Gson();
String json = prefs.getString(key, null);
Type type = new TypeToken<ArrayList<String>>() {}.getType();
return gson.fromJson(json, type);
}
推荐文章
- BottomSheetDialogFragment的圆角
- 在应用程序启动时出现“无法获得BatchedBridge,请确保您的bundle被正确打包”的错误
- 我如何改变默认对话框按钮的文本颜色在安卓5
- 更改单选按钮的圆圈颜色
- 如何在android中复制一个文件?
- adb找不到我的设备/手机(MacOS X)
- 如何在新的材质主题中改变背面箭头的颜色?
- androidviewpager与底部点
- 相同的导航抽屉在不同的活动
- 如何从视图中获得托管活动?
- 单一的TextView与多种颜色的文本
- 如何在非活动类(LocationManager)中使用getSystemService ?
- 检查ArrayList中是否存在值
- 在清单中注册应用程序类?
- Android:从数组中编程创建旋转器