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I'm slowly working through an Android learning book and was given the following code to assign user data:
package com.androidbook.triviaquiz; import android.app.Activity; import android.content.SharedPreferences; public class QuizActivity extends Activity { public static final String GAME_PREFERENCES = "GamePrefs"; SharedPreferences settings = getSharedPreferences(GAME_PREFERENCES, MODE_PRIVATE); SharedPreferences.Editor prefEditor = settings.edit(); prefeditor.putString("UserName", "John Doe"); //**syntax error on tokens** prefEditor.putInt("UserAge", 22); //**syntax error on tokens** prefEditor.commit(); } However, I get an error (lines indicated with comments) that underlines the period and says "misplaced construct" and also that underlines the arguments saying "delete these tokens". I have seen this done in other applications in the same format, I don't understand what is wrong.
858
Mark in the editor to remove all values from the preferences. Commit your preferences changes back from this Editor to the SharedPreferences object it is editing. Set a boolean value in the preferences editor, to be written back once commit() or apply() are called.
Shared Preferences allow you to save and retrieve data in the form of key,value pair. In order to use shared preferences, you have to call a method getSharedPreferences() that returns a SharedPreference instance pointing to the file that contains the values of preferences.
clear(), It delete only values (means that keys are available) or it delete key value pair. check the following code. Mark in the editor to remove all values from the preferences.
Shared preferences allow you to store small amounts of primitive data as key/value pairs in a file on the device. To get a handle to a preference file, and to read, write, and manage preference data, use the SharedPreferences class. The Android framework manages the shared preferences file itself.
Edit: Of course! Those statements cannot be put directly into the class at that level and must be inside a method, something like this:
public class QuizActivity extends Activity { public static final String GAME_PREFERENCES = "GamePrefs"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); SharedPreferences settings = getSharedPreferences(GAME_PREFERENCES, MODE_PRIVATE); SharedPreferences.Editor prefEditor = settings.edit(); prefEditor.putString("UserName", "John Doe"); prefEditor.putInt("UserAge", 22); prefEditor.putString("Gender", "Male"); prefEditor.commit(); } } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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