sharedpreferences

Android ArrayList of custom objects – Save to SharedPreferences – Serializable?

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Yes, you can save your composite object in shared preferences. Let’s say.. Student mStudentObject = new Student(); SharedPreferences appSharedPrefs = PreferenceManager .getDefaultSharedPreferences(this.getApplicationContext()); Editor prefsEditor = appSharedPrefs.edit(); Gson gson = new Gson(); String json = gson.toJson(mStudentObject); prefsEditor.putString(“MyObject”, json); prefsEditor.commit(); ..and now you can retrieve your object as: SharedPreferences appSharedPrefs = PreferenceManager .getDefaultSharedPreferences(this.getApplicationContext()); Gson gson = new … Read more

How to iterate through all keys of shared preferences?

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What you can do is use getAll() method of SharedPreferences and get all the values in Map<String,?> and then you can easily iterate through. Map<String,?> keys = prefs.getAll(); for(Map.Entry<String,?> entry : keys.entrySet()){ Log.d(“map values”,entry.getKey() + “: ” + entry.getValue().toString()); } For more you can check PrefUtil.java’s dump() implementation.

how to use getSharedPreferences in android

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First get the instance of SharedPreferences using SharedPreferences userDetails = context.getSharedPreferences(“userdetails”, MODE_PRIVATE); Now to save the values in the SharedPreferences Editor edit = userDetails.edit(); edit.putString(“username”, username.getText().toString().trim()); edit.putString(“password”, password.getText().toString().trim()); edit.apply(); Above lines will write username and password to preference Now to to retrieve saved values from preference, you can follow below lines of code String userName … Read more

Is it possible to add an array or object to SharedPreferences on Android

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Regardless of the API level, Check String arrays and Object arrays in SharedPreferences SAVE ARRAY public boolean saveArray(String[] array, String arrayName, Context mContext) { SharedPreferences prefs = mContext.getSharedPreferences(“preferencename”, 0); SharedPreferences.Editor editor = prefs.edit(); editor.putInt(arrayName +”_size”, array.length); for(int i=0;i<array.length;i++) editor.putString(arrayName + “_” + i, array[i]); return editor.commit(); } LOAD ARRAY public String[] loadArray(String arrayName, Context mContext) … Read more

How to listen for preference changes within a PreferenceFragment?

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I believe you just need to register/unregister the Listener in your PreferenceFragment and it will work. @Override public void onResume() { super.onResume(); getPreferenceManager().getSharedPreferences().registerOnSharedPreferenceChangeListener(this); } @Override public void onPause() { getPreferenceManager().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this); super.onPause(); } Depending on what you want to do you may not need to use a listener. Changes to the preferences are committed to SharedPreferences … Read more

Android SharedPreferences in Fragment

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The method getSharedPreferences is a method of the Context object, so just calling getSharedPreferences from a Fragment will not work…because it is not a Context! (Activity is an extension of Context, so we can call getSharedPreferences from it). So you have to get your applications Context by // this = your fragment SharedPreferences preferences = … Read more

How to save HashMap to Shared Preferences?

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I use Gson to convert HashMap to String and then save it to SharedPrefs private void hashmaptest() { //create test hashmap HashMap<String, String> testHashMap = new HashMap<String, String>(); testHashMap.put(“key1”, “value1”); testHashMap.put(“key2”, “value2”); //convert to string using gson Gson gson = new Gson(); String hashMapString = gson.toJson(testHashMap); //save in shared prefs SharedPreferences prefs = getSharedPreferences(“test”, MODE_PRIVATE); … Read more