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POwhen LauncherProvider.DatabaseHelper.convertDatabase(SQLiteDatabase db) return true in Android default Launcher?
 

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  1. POwhen LauncherProvider.DatabaseHelper.convertDatabase(SQLiteDatabase db) return true in Android default Launcher?
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    <p>I meet a problem when read the source code of Android 2.2 default Launcher.<br> the source code segment of LauncherProvider.DatabaseHelper:</p> <pre><code>@Override public void onCreate(SQLiteDatabase db) { if (LOGD) Log.d(TAG, "creating new launcher database"); db.execSQL("CREATE TABLE favorites (" + "_id INTEGER PRIMARY KEY," + "title TEXT," + "intent TEXT," + "container INTEGER," + "screen INTEGER," + "cellX INTEGER," + "cellY INTEGER," + "spanX INTEGER," + "spanY INTEGER," + "itemType INTEGER," + "appWidgetId INTEGER NOT NULL DEFAULT -1," + "isShortcut INTEGER," + "iconType INTEGER," + "iconPackage TEXT," + "iconResource TEXT," + "icon BLOB," + "uri TEXT," + "displayMode INTEGER" + ");"); // Database was just created, so wipe any previous widgets if (mAppWidgetHost != null) { mAppWidgetHost.deleteHost(); sendAppWidgetResetNotify(); } if (!convertDatabase(db)) { // Populate favorites table with initial favorites loadFavorites(db); } } private boolean convertDatabase(SQLiteDatabase db) { if (LOGD) Log.d(TAG, "converting database from an older format, but not onUpgrade"); boolean converted = false; final Uri uri = Uri.parse("content://" + Settings.AUTHORITY + "/old_favorites?notify=true"); final ContentResolver resolver = mContext.getContentResolver(); Cursor cursor = null; try { cursor = resolver.query(uri, null, null, null, null); } catch (Exception e) { // Ignore } // We already have a favorites database in the old provider if (cursor != null &amp;&amp; cursor.getCount() &gt; 0) { try { converted = copyFromCursor(db, cursor) &gt; 0; } finally { cursor.close(); } if (converted) { resolver.delete(uri, null, null); } } if (converted) { // Convert widgets from this import into widgets if (LOGD) Log.d(TAG, "converted and now triggering widget upgrade"); convertWidgets(db); } return converted; } </code></pre> <p><code>onCreate()</code> is called to create database when there is no database in system. At the tail of onCreate(), it calls convertDatabase(SQLiteDatabase db). And there have query codes in convertDatabase(SQLiteDatabase db).I am confused. Why it query in onCreate()? when convertDatabase(SQLiteDatabase db) will return true? My Android version is 2.2 </p>
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