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angelix/ManagedDataHelper.java

Last active December 20, 2015 16:59
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ManagedDataHelper is a Helper class that gives you the ability to override strings (or array of strings) saved on Android Resources (xml) with data from a remote JSON document.
Raw
ManagedDataHelper.java
public class ManagedDataHelper {
static ManagedDataHelper sSelf = null;
static final String SHARED_PREFERENCES_FILENAME = "managed_data";
Context mContext;
Resources mResources;
SharedPreferences mSharedPreferences;
private ManagedDataHelper(Context context) {
mContext = context;
mResources = mContext.getResources();
mSharedPreferences = mContext.getSharedPreferences(
SHARED_PREFERENCES_FILENAME, 0);
}
public static ManagedDataHelper factory(Context context) {
if (sSelf == null) {
sSelf = new ManagedDataHelper(context);
}
return sSelf;
}
public String getString(String key) {
String value = null;
boolean hasKey = mSharedPreferences.contains(key);
if (hasKey) {
value = mSharedPreferences.getString(key, null);
if (value != null) {
return value;
}
}
return value;
}
public String getString(String key, String defVal) {
String value = getString(key);
if (value != null) {
return value;
} else {
return defVal;
}
}
/*
* If resourceID is zero 0 then we try to find the string resource with the
* same name, it is better to use resourceID for speed reasons
*/
public String getString(String key, int resourceID) {
String value = getString(key);
if (value == null) {
if (resourceID == 0) {
// try to find the resID from key name
resourceID = mResources.getIdentifier(key, "string",
mContext.getPackageName());
}
if (resourceID > 0) {
value = mResources.getString(resourceID);
}
}
return value;
}
public String[] getStringArray(String key) {
String[] values = null;
boolean hasKey = mSharedPreferences.contains(key);
if (hasKey) {
String json = mSharedPreferences.getString(key, null);
if (json != null) {
try {
JSONArray a = new JSONArray(json);
values = new String[a.length()];
for (int i = 0; i < a.length(); i++) {
values[i] = a.optString(i);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
return values;
}
/*
* If resourceID is zero 0 then we try to find the string resource with the
* same name, it is better to use resourceID for speed reasons
*/
public String[] getStringArray(String key, int resourceID) {
String[] values = getStringArray(key);
if (values == null) {
if (resourceID == 0) {
// try to find the resID from key name
resourceID = mResources.getIdentifier(key, "string",
mContext.getPackageName());
}
if (resourceID > 0) {
values = mResources.getStringArray(resourceID);
}
}
return values;
}
public void updateData(JSONObject json) {
Editor editor = mSharedPreferences.edit();
if (json != null) {
Iterator<String> it = json.keys();
String key = null;
while (it.hasNext()) {
String value = null;
key = it.next();
// if value is null then remove the key from xml
if (json.isNull(key)) {
editor.remove(key);
} else {
// try to see if it is an array of strings
try {
JSONArray jsonArray = json.getJSONArray(key);
editor.putString(key, jsonArray.toString());
} catch (Exception e) {
value = null;
}
if (value == null) {
try {
value = json.getString(key);
if (value != null) {
editor.putString(key, value);
}
} catch (Exception e) {
value = null;
}
}
}
}
editor.apply();
}
}
}
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