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not working but it's a good start #89
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indywidualny
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Feb 2, 2016
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71 changes: 71 additions & 0 deletions
71
app/src/main/java/org/indywidualni/fblite/util/Offline.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| package org.indywidualni.fblite.util; | ||
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| import android.content.Context; | ||
| import android.database.SQLException; | ||
| import android.os.AsyncTask; | ||
| import android.os.Build; | ||
| import android.util.Log; | ||
| import android.webkit.CookieManager; | ||
| import android.webkit.CookieSyncManager; | ||
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| import net.grandcentrix.tray.TrayAppPreferences; | ||
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| import org.indywidualni.fblite.MyApplication; | ||
| import org.indywidualni.fblite.util.database.OfflineDataSource; | ||
| import org.jsoup.Connection; | ||
| import org.jsoup.Jsoup; | ||
| import org.jsoup.nodes.Document; | ||
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| public class Offline { | ||
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| private static String userAgent; | ||
| private static Context context; | ||
| private OfflineDataSource dataSource; | ||
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| public Offline() { | ||
| context = MyApplication.getContextOfApplication(); | ||
| TrayAppPreferences trayPreferences = new TrayAppPreferences(context); | ||
| userAgent = trayPreferences.getString("webview_user_agent", System.getProperty("http.agent")); | ||
| dataSource = OfflineDataSource.getInstance(); | ||
| syncCookies(); | ||
| } | ||
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| public OfflineDataSource getDataSource() { | ||
| return dataSource; | ||
| } | ||
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| public void savePage(String url) throws SQLException { | ||
| new SaveTask().execute(url); | ||
| } | ||
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| private class SaveTask extends AsyncTask<String, Void, Void> { | ||
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| @Override | ||
| protected Void doInBackground(String... args) throws SQLException { | ||
| try { | ||
| final Connection.Response response = Jsoup.connect(args[0]).userAgent(userAgent) | ||
| .cookie("https://m.facebook.com", CookieManager.getInstance().getCookie("https://m.facebook.com")).execute(); | ||
| final Document doc = response.parse(); | ||
| dataSource.insertPage(args[0], doc.outerHtml()); | ||
| } catch (Exception e) { | ||
| Log.e(getClass().getSimpleName(), "Problem saving the current page"); | ||
| e.printStackTrace(); | ||
| } | ||
| return null; | ||
| } | ||
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| } | ||
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| /** CookieSyncManager was deprecated in API level 21. | ||
| * We need it for API level lower than 21 though. | ||
| * In API level >= 21 it's done automatically. | ||
| */ | ||
| @SuppressWarnings("deprecation") | ||
| private void syncCookies() { | ||
| if (Build.VERSION.SDK_INT < 21) { | ||
| CookieSyncManager.createInstance(context); | ||
| CookieSyncManager.getInstance().sync(); | ||
| } | ||
| } | ||
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| } |
36 changes: 36 additions & 0 deletions
36
app/src/main/java/org/indywidualni/fblite/util/database/MySQLiteHelper.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| package org.indywidualni.fblite.util.database; | ||
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| import android.database.sqlite.SQLiteDatabase; | ||
| import android.database.sqlite.SQLiteOpenHelper; | ||
| import android.util.Log; | ||
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| import org.indywidualni.fblite.MyApplication; | ||
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| public class MySQLiteHelper extends SQLiteOpenHelper { | ||
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| private static final String DATABASE_NAME = "offline.db"; | ||
| private static final int DATABASE_VERSION = 1; | ||
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| public MySQLiteHelper() { | ||
| super(MyApplication.getContextOfApplication(), DATABASE_NAME, null, DATABASE_VERSION); | ||
| } | ||
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| @Override | ||
| public void onCreate(SQLiteDatabase database) { | ||
| Log.v("SQLiteDatabase", "Creating database"); | ||
| database.execSQL("CREATE TABLE Pages (" + | ||
| "url TEXT NOT NULL PRIMARY KEY, " + | ||
| "html TEXT" + | ||
| ");"); | ||
| } | ||
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| @Override | ||
| public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { | ||
| Log.w(MySQLiteHelper.class.getName(), | ||
| "Upgrading database from version " + oldVersion + " to " | ||
| + newVersion + ", which will destroy all old data"); | ||
| db.execSQL("DROP TABLE IF EXISTS Pages;"); | ||
| onCreate(db); | ||
| } | ||
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| } |
73 changes: 73 additions & 0 deletions
73
app/src/main/java/org/indywidualni/fblite/util/database/OfflineDataSource.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| package org.indywidualni.fblite.util.database; | ||
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| import android.database.Cursor; | ||
| import android.database.SQLException; | ||
| import android.database.sqlite.SQLiteDatabase; | ||
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| public class OfflineDataSource { | ||
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| private static volatile OfflineDataSource instance; | ||
| private static final int MAX_PAGES = 50; | ||
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| private SQLiteDatabase database; | ||
| private MySQLiteHelper dbHelper; | ||
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| private OfflineDataSource() {} | ||
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| public static OfflineDataSource getInstance() { | ||
| if (instance == null) { | ||
| synchronized (OfflineDataSource.class) { | ||
| if (instance == null) | ||
| instance = new OfflineDataSource(); | ||
| } | ||
| } | ||
| return instance; | ||
| } | ||
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| private void open() throws SQLException { | ||
| if (dbHelper == null) { | ||
| dbHelper = new MySQLiteHelper(); | ||
| database = dbHelper.getWritableDatabase(); | ||
| } | ||
| } | ||
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| private void close() { | ||
| if (database != null) { | ||
| dbHelper.close(); | ||
| dbHelper = null; | ||
| database = null; | ||
| } | ||
| } | ||
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| // todo: trim the database during every app start when offline mode is enabled to store MAX_PAGES values | ||
| // todo: or better trim it every onStop() to avoid (relatively) huge storage consumption | ||
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| public synchronized void insertPage(String url, String html) throws SQLException { | ||
| open(); | ||
| database.rawQuery("INSERT or REPLACE INTO Pages (url, html) " + | ||
| "values (?, ?);", new String[] { url, html }); | ||
| close(); | ||
| } | ||
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| public synchronized String getPage(String url) throws SQLException { | ||
| open(); | ||
| Cursor cursor = null; | ||
| // TODO: make it a resource string | ||
| String html = "<center><h1>This page was not found in offline database</h1></center>"; | ||
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| try { | ||
| cursor = database.rawQuery("SELECT html FROM Pages WHERE url=?", new String[] { url }); | ||
| if(cursor.getCount() > 0) { | ||
| cursor.moveToFirst(); | ||
| html = cursor.getString(cursor.getColumnIndex("html")); | ||
| } | ||
| } finally { | ||
| if (cursor != null) | ||
| cursor.close(); | ||
| } | ||
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| close(); | ||
| return html; | ||
| } | ||
|
|
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| } |
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