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I have an ArrayList with custom objects. 我有一个带有自定义对象的ArrayList 。 Each custom object contains a variety of strings and numbers. 每个自定义对象均包含各种字符串和数字。 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. 即使用户离开活动然后想要稍后再回来，我也需要阵列保持住状态，但是在应用程序完全关闭后，我不需要阵列可用。 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. 我通过使用SharedPreferences以这种方式保存了许多其他对象，但是我不知道如何以这种方式保存我的整个数组。 Is this possible? 这可能吗？ Maybe SharedPreferences isn't the way to go about this? 也许不是SharedPreferences可以解决这个问题？ Is there a simpler method? 有没有更简单的方法？
参考：
Saving Array in SharedPreferences : 将Array保存在SharedPreferences ：
public static boolean saveArray(){ SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this); SharedPreferences.Editor mEdit1 = sp.edit(); /* sKey is an array */ mEdit1.putInt("Status_size", sKey.size()); for(int i=0;i Loading Array Data from SharedPreferences 从SharedPreferences加载Array数据
public static void loadArray(Context mContext){ SharedPreferences mSharedPreference1 = PreferenceManager.getDefaultSharedPreferences(mContext); sKey.clear(); int size = mSharedPreference1.getInt("Status_size", 0); for(int i=0;i You could refer the serializeKey() and deserializeKey() functions from FacebookSDK's SharedPreferencesTokenCache class. 您可以从FacebookSDK的SharedPreferencesTokenCache类引用serializeKey（）和deserializeKey（）函数。 It converts the supportedType into the JSON object and store the JSON string into SharedPreferences . 它将supportedType转换为JSON对象，并将JSON字符串存储到SharedPreferences中 。 You could download SDK from 您可以从下载SDK
private void serializeKey(String key, Bundle bundle, SharedPreferences.Editor editor) throws JSONException { Object value = bundle.get(key); if (value == null) { // Cannot serialize null values. return; } String supportedType = null; JSONArray jsonArray = null; JSONObject json = new JSONObject(); if (value instanceof Byte) { supportedType = TYPE_BYTE; json.put(JSON_VALUE, ((Byte)value).intValue()); } else if (value instanceof Short) { supportedType = TYPE_SHORT; json.put(JSON_VALUE, ((Short)value).intValue()); } else if (value instanceof Integer) { supportedType = TYPE_INTEGER; json.put(JSON_VALUE, ((Integer)value).intValue()); } else if (value instanceof Long) { supportedType = TYPE_LONG; json.put(JSON_VALUE, ((Long)value).longValue()); } else if (value instanceof Float) { supportedType = TYPE_FLOAT; json.put(JSON_VALUE, ((Float)value).doubleValue()); } else if (value instanceof Double) { supportedType = TYPE_DOUBLE; json.put(JSON_VALUE, ((Double)value).doubleValue()); } else if (value instanceof Boolean) { supportedType = TYPE_BOOLEAN; json.put(JSON_VALUE, ((Boolean)value).booleanValue()); } else if (value instanceof Character) { supportedType = TYPE_CHAR; json.put(JSON_VALUE, value.toString()); } else if (value instanceof String) { supportedType = TYPE_STRING; json.put(JSON_VALUE, (String)value); } else { // Optimistically create a JSONArray. If not an array type, we can null // it out later jsonArray = new JSONArray(); if (value instanceof byte[]) { supportedType = TYPE_BYTE_ARRAY; for (byte v : (byte[])value) { jsonArray.put((int)v); } } else if (value instanceof short[]) { supportedType = TYPE_SHORT_ARRAY; for (short v : (short[])value) { jsonArray.put((int)v); } } else if (value instanceof int[]) { supportedType = TYPE_INTEGER_ARRAY; for (int v : (int[])value) { jsonArray.put(v); } } else if (value instanceof long[]) { supportedType = TYPE_LONG_ARRAY; for (long v : (long[])value) { jsonArray.put(v); } } else if (value instanceof float[]) { supportedType = TYPE_FLOAT_ARRAY; for (float v : (float[])value) { jsonArray.put((double)v); } } else if (value instanceof double[]) { supportedType = TYPE_DOUBLE_ARRAY; for (double v : (double[])value) { jsonArray.put(v); } } else if (value instanceof boolean[]) { supportedType = TYPE_BOOLEAN_ARRAY; for (boolean v : (boolean[])value) { jsonArray.put(v); } } else if (value instanceof char[]) { supportedType = TYPE_CHAR_ARRAY; for (char v : (char[])value) { jsonArray.put(String.valueOf(v)); } } else if (value instanceof List ) { supportedType = TYPE_STRING_LIST; @SuppressWarnings("unchecked") List stringList = (List )value; for (String v : stringList) { jsonArray.put((v == null) ? JSONObject.NULL : v); } } else { // Unsupported type. Clear out the array as a precaution even though // it is redundant with the null supportedType. jsonArray = null; } } if (supportedType != null) { json.put(JSON_VALUE_TYPE, supportedType); if (jsonArray != null) { // If we have an array, it has already been converted to JSON. So use // that instead. json.putOpt(JSON_VALUE, jsonArray); } String jsonString = json.toString(); editor.putString(key, jsonString); }}private void deserializeKey(String key, Bundle bundle) throws JSONException { String jsonString = cache.getString(key, "{}"); JSONObject json = new JSONObject(jsonString); String valueType = json.getString(JSON_VALUE_TYPE); if (valueType.equals(TYPE_BOOLEAN)) { bundle.putBoolean(key, json.getBoolean(JSON_VALUE)); } else if (valueType.equals(TYPE_BOOLEAN_ARRAY)) { JSONArray jsonArray = json.getJSONArray(JSON_VALUE); boolean[] array = new boolean[jsonArray.length()]; for (int i = 0; i < array.length; i++) { array[i] = jsonArray.getBoolean(i); } bundle.putBooleanArray(key, array); } else if (valueType.equals(TYPE_BYTE)) { bundle.putByte(key, (byte)json.getInt(JSON_VALUE)); } else if (valueType.equals(TYPE_BYTE_ARRAY)) { JSONArray jsonArray = json.getJSONArray(JSON_VALUE); byte[] array = new byte[jsonArray.length()]; for (int i = 0; i < array.length; i++) { array[i] = (byte)jsonArray.getInt(i); } bundle.putByteArray(key, array); } else if (valueType.equals(TYPE_SHORT)) { bundle.putShort(key, (short)json.getInt(JSON_VALUE)); } else if (valueType.equals(TYPE_SHORT_ARRAY)) { JSONArray jsonArray = json.getJSONArray(JSON_VALUE); short[] array = new short[jsonArray.length()]; for (int i = 0; i < array.length; i++) { array[i] = (short)jsonArray.getInt(i); } bundle.putShortArray(key, array); } else if (valueType.equals(TYPE_INTEGER)) { bundle.putInt(key, json.getInt(JSON_VALUE)); } else if (valueType.equals(TYPE_INTEGER_ARRAY)) { JSONArray jsonArray = json.getJSONArray(JSON_VALUE); int[] array = new int[jsonArray.length()]; for (int i = 0; i < array.length; i++) { array[i] = jsonArray.getInt(i); } bundle.putIntArray(key, array); } else if (valueType.equals(TYPE_LONG)) { bundle.putLong(key, json.getLong(JSON_VALUE)); } else if (valueType.equals(TYPE_LONG_ARRAY)) { JSONArray jsonArray = json.getJSONArray(JSON_VALUE); long[] array = new long[jsonArray.length()]; for (int i = 0; i < array.length; i++) { array[i] = jsonArray.getLong(i); } bundle.putLongArray(key, array); } else if (valueType.equals(TYPE_FLOAT)) { bundle.putFloat(key, (float)json.getDouble(JSON_VALUE)); } else if (valueType.equals(TYPE_FLOAT_ARRAY)) { JSONArray jsonArray = json.getJSONArray(JSON_VALUE); float[] array = new float[jsonArray.length()]; for (int i = 0; i < array.length; i++) { array[i] = (float)jsonArray.getDouble(i); } bundle.putFloatArray(key, array); } else if (valueType.equals(TYPE_DOUBLE)) { bundle.putDouble(key, json.getDouble(JSON_VALUE)); } else if (valueType.equals(TYPE_DOUBLE_ARRAY)) { JSONArray jsonArray = json.getJSONArray(JSON_VALUE); double[] array = new double[jsonArray.length()]; for (int i = 0; i < array.length; i++) { array[i] = jsonArray.getDouble(i); } bundle.putDoubleArray(key, array); } else if (valueType.equals(TYPE_CHAR)) { String charString = json.getString(JSON_VALUE); if (charString != null && charString.length() == 1) { bundle.putChar(key, charString.charAt(0)); } } else if (valueType.equals(TYPE_CHAR_ARRAY)) { JSONArray jsonArray = json.getJSONArray(JSON_VALUE); char[] array = new char[jsonArray.length()]; for (int i = 0; i < array.length; i++) { String charString = jsonArray.getString(i); if (charString != null && charString.length() == 1) { array[i] = charString.charAt(0); } } bundle.putCharArray(key, array); } else if (valueType.equals(TYPE_STRING)) { bundle.putString(key, json.getString(JSON_VALUE)); } else if (valueType.equals(TYPE_STRING_LIST)) { JSONArray jsonArray = json.getJSONArray(JSON_VALUE); int numStrings = jsonArray.length(); ArrayList stringList = new ArrayList (numStrings); for (int i = 0; i < numStrings; i++) { Object jsonStringValue = jsonArray.get(i); stringList.add(i, jsonStringValue == JSONObject.NULL ? null : (String)jsonStringValue); } bundle.putStringArrayList(key, stringList); }} best way is that convert to JSOn string using GSON and save this string to SharedPreference. 最好的方法是使用GSON转换为JSOn字符串，然后将此字符串保存到SharedPreference。 I also use this way to cache responses. 我也使用这种方式来缓存响应。
The best way i have been able to find is a make a 2D Array of keys and put the custom items of the array in the 2-D array of keys and then retrieve it through the 2D arra on startup. 我能够找到的最好方法是制作一个二维键数组，并将该数组的自定义项放入二维键数组中，然后在启动时通过二维arra检索它。 I did not like the idea of using string set because most of the android users are still on Gingerbread and using string set requires honeycomb. 我不喜欢使用字符串集的想法，因为大多数android用户仍在使用Gingerbread，并且使用字符串集需要蜂窝。
Sample Code: here ditor is the shared pref editor and rowitem is my custom object. 示例代码：此处ditor是共享的pref编辑器，rowitem是我的自定义对象。
editor.putString(genrealfeedkey[j][1], Rowitemslist.get(j).getname()); editor.putString(genrealfeedkey[j][2], Rowitemslist.get(j).getdescription()); editor.putString(genrealfeedkey[j][3], Rowitemslist.get(j).getlink()); editor.putString(genrealfeedkey[j][4], Rowitemslist.get(j).getid()); editor.putString(genrealfeedkey[j][5], Rowitemslist.get(j).getmessage());
Using this object --> its very simple. 使用此对象-> 非常简单。
TinyDB tinydb = new TinyDB(context);
to put 放在
tinydb.putList("MyUsers", mUsersArray); to get 要得到
tinydb.getList("MyUsers"); UPDATE 更新
Some useful examples and troubleshooting might be found here: 可能会在此处找到一些有用的示例和故障排除：
转载地址：http://sgcnb.baihongyu.com/