Android - Day 2

Aug 17, 2015Download as PPTX, PDF1 like589 views

This document discusses different data storage options in Android apps, including preferences, files, SQLite databases, and network storage. It provides details on how to use shared preferences to store key-value pairs and how to read and write preference values. SQLite databases can be used to store structured app data and require using SQLite classes like SQLiteHelper. Content providers allow an app's data to be shared with other apps and involve defining a content provider URI and database.

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Data Storage in Android

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Data Storage in Android
 Preferences
 Files
 SQLite
 Network

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Preference
A way of data persistence in Android that stores data in form of
key value pair like user specific setting, endpoint url, the
security access token etc.
Android stores shared preference settings
as XML file under:-
data/data/packagename/shared_prefs/
packagename_preferences.xml.

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Preference
once you uninstall the
application
once you clear
application data (through
Settings)
The data is lost when you perform any one following task:-

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Commonly used Shared Preferences
 ListPreference
 CheckBoxPreference
 EditTextPreference

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Preference
Creating preferences:-
The Preferences Activity screen is defined in the preferences.xml
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android"
android:key=“pref_screen“….>
<CheckBoxPreference
android:key=“checkbox_pref“…. />
<ListPreference
android:key=“list_pref“…./>
<EditTextPreference
android:key=“edit_pref”…./>
</PreferenceScreen>

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Create the Preferences Activity
public class AppPreferences extends PreferenceActivity
{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.pref);
}
}
Preference

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Preference
To read the preferences values
SharedPreferences sp =
PreferenceManager.getDefaultSharedPreferences(getBaseContext());
String strUserName = sp.getString("username", “ABC");
boolean bAppUpdates = sp.getBoolean("applicationUpdates",false);
String downloadType = sp.getString("downloadType","1");

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Internal storage
 It is private to your application and other applications
cannot access them (nor can the user)
 When the app uninstalls, these files are removed.
External storage
 External storage such as SD card can also store application data.
 There's no security enforced upon files you save to the external
storage.
 All applications can read and write files placed on the external
storage and the user can remove them for this they need Read
and Write permission.
Internal & External
Storage

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SQLite DB
SQLite is an Open Source database which supports standard
relational database features like SQL syntax, transaction etc.
It is embedded into every Android
device.
Database is by default saved in the
directory
DATA/data/APP_NAME/databases/FILENA
ME.

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SQLite DB
Necessary classes for working with databases:-
 SQLiteHelper
 SQLiteDataBase
 Cursor

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Content Provider

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Content Provider
An Android component that supplies data from one app to another on
request.
A content provider can use different ways to store its data and the data can be
stored in a database, infiles, or even over a network.

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Content Provider

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Content Provider
Creating content provider
 Create a content provider class that extends the contentproviderbaseclass.
 Define your content provider uri address.
 Create your own database to keep the content.
 Implement content provider queries.
 Register your content provider in menifest file.

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Android - Day 2

2. Slide 2 of 19© People Strategists www.peoplestrategists.com Slide 2 of 57© People Strategists www.peoplestrategists.com Data Storage in Android  Preferences  Files  SQLite  Network

3. Slide 3 of 19© People Strategists www.peoplestrategists.com Slide 3 of 57© People Strategists www.peoplestrategists.com

4. Slide 4 of 19© People Strategists www.peoplestrategists.com Preference A way of data persistence in Android that stores data in form of key value pair like user specific setting, endpoint url, the security access token etc. Android stores shared preference settings as XML file under:- data/data/packagename/shared_prefs/ packagename_preferences.xml.

5. Slide 5 of 19© People Strategists www.peoplestrategists.com Preference once you uninstall the application once you clear application data (through Settings) The data is lost when you perform any one following task:-

6. Slide 6 of 19© People Strategists www.peoplestrategists.com Commonly used Shared Preferences  ListPreference  CheckBoxPreference  EditTextPreference

7. Slide 7 of 19© People Strategists www.peoplestrategists.com Preference Creating preferences:- The Preferences Activity screen is defined in the preferences.xml <?xml version="1.0" encoding="utf-8"?> <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" android:key=“pref_screen“….> <CheckBoxPreference android:key=“checkbox_pref“…. /> <ListPreference android:key=“list_pref“…./> <EditTextPreference android:key=“edit_pref”…./> </PreferenceScreen>

8. Slide 8 of 19© People Strategists www.peoplestrategists.com Create the Preferences Activity public class AppPreferences extends PreferenceActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); addPreferencesFromResource(R.xml.pref); } } Preference

9. Slide 9 of 19© People Strategists www.peoplestrategists.com Preference To read the preferences values SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getBaseContext()); String strUserName = sp.getString("username", “ABC"); boolean bAppUpdates = sp.getBoolean("applicationUpdates",false); String downloadType = sp.getString("downloadType","1");

10. Slide 10 of 19© People Strategists www.peoplestrategists.com Slide 10 of 57© People Strategists www.peoplestrategists.com

11. Slide 11 of 19© People Strategists www.peoplestrategists.com Internal storage  It is private to your application and other applications cannot access them (nor can the user)  When the app uninstalls, these files are removed. External storage  External storage such as SD card can also store application data.  There's no security enforced upon files you save to the external storage.  All applications can read and write files placed on the external storage and the user can remove them for this they need Read and Write permission. Internal & External Storage

12. Slide 12 of 19© People Strategists www.peoplestrategists.com SQLite DB SQLite is an Open Source database which supports standard relational database features like SQL syntax, transaction etc. It is embedded into every Android device. Database is by default saved in the directory DATA/data/APP_NAME/databases/FILENA ME.

13. Slide 13 of 19© People Strategists www.peoplestrategists.com SQLite DB Necessary classes for working with databases:-  SQLiteHelper  SQLiteDataBase  Cursor

15. Slide 15 of 19© People Strategists www.peoplestrategists.com Slide 15 of 57© People Strategists www.peoplestrategists.com Content Provider An Android component that supplies data from one app to another on request. A content provider can use different ways to store its data and the data can be stored in a database, infiles, or even over a network.

16. Slide 16 of 19© People Strategists www.peoplestrategists.com Slide 16 of 57© People Strategists www.peoplestrategists.com Content Provider

17. Slide 17 of 19© People Strategists www.peoplestrategists.com Slide 17 of 57© People Strategists www.peoplestrategists.com Content Provider Creating content provider  Create a content provider class that extends the contentproviderbaseclass.  Define your content provider uri address.  Create your own database to keep the content.  Implement content provider queries.  Register your content provider in menifest file.

18. Slide 18 of 19© People Strategists www.peoplestrategists.com Slide 18 of 57© People Strategists www.peoplestrategists.com Demo Security and Packages

19. Slide 19 of 19© People Strategists www.peoplestrategists.com Slide 19 of 57© People Strategists www.peoplestrategists.com Demo Talking to the Server

Android - Day 2

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