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POAndroid SQLite and huge data sets
 

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  1. POAndroid SQLite and huge data sets
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    <p>We are creating an app for a client that has hundreds of megabytes of HTML in SQLite databases. We have implemented a way to query this data and scroll through it all in a reasonably fast manner. The issue is that some of the databases have very large queries (20,000+ rows) and we are seeing errors when we are growing the queries as the user is scrolling. So I guess the question is, what options do we have in querying and displaying tens of thousands of rows of data in Android?</p> <p>Here is the stacktrace we're seeing:</p> <pre><code>09-10 19:19:12.575: WARN/IInputConnectionWrapper(640): showStatusIcon on inactive InputConnection 09-10 19:19:18.226: DEBUG/dalvikvm(640): GC freed 446 objects / 16784 bytes in 330ms 09-10 19:19:32.886: ERROR/CursorWindow(19416): need to grow: mSize = 1048576, size = 36, freeSpace() = 30, numRows = 17717 09-10 19:19:32.896: ERROR/CursorWindow(19416): not growing since there are already 17717 row(s), max size 1048576 09-10 19:19:32.916: ERROR/CursorWindow(19416): The row failed, so back out the new row accounting from allocRowSlot 17716 09-10 19:19:33.005: ERROR/Cursor(19416): Failed allocating fieldDir at startPos 0 row 17716 09-10 19:19:35.596: DEBUG/Cursor(19416): finish_program_and_get_row_count row 24315 09-10 19:19:41.545: DEBUG/dalvikvm(698): GC freed 2288 objects / 126080 bytes in 260ms 09-10 19:19:43.705: WARN/KeyCharacterMap(19416): No keyboard for id 0 09-10 19:19:43.717: WARN/KeyCharacterMap(19416): Using default keymap: /system/usr/keychars/qwerty.kcm.bin 09-10 19:20:04.705: ERROR/CursorWindow(19416): need to grow: mSize = 1048576, size = 17, freeSpace() = 3, numRows = 17094 09-10 19:20:04.716: ERROR/CursorWindow(19416): not growing since there are already 17094 row(s), max size 1048576 09-10 19:20:04.726: ERROR/Cursor(19416): Failed allocating 17 bytes for text/blob at 17093,2 09-10 19:20:05.656: DEBUG/Cursor(19416): finish_program_and_get_row_count row 5257 09-10 19:24:54.685: DEBUG/dalvikvm(637): GC freed 9297 objects / 524176 bytes in 247ms 09-10 19:32:07.656: DEBUG/dalvikvm(19416): GC freed 9035 objects / 495840 bytes in 199ms </code></pre> <p>Here is our CursorAdapter code:</p> <pre><code> private class MyAdapter extends ResourceCursorAdapter { public MyAdapter(Context context, Cursor cursor) { super(context, R.layout.my_row, cursor); } public void bindView(View view, Context context, Cursor cursor) { RowData data = new RowData(); data.setName(cursor.getInt(cursor.getColumnIndex("name"))); TextView tvItemText = (TextView)view.findViewById(R.id.tvItemText); tvItemText.setText(data.getName()); view.setTag(data); } @Override public Cursor runQueryOnBackgroundThread(CharSequence constraint) { /* Display the progress indicator */ updateHandler.post(onFilterStart); /* Run the actual query */ if (constraint == null) { return myDbObject.getData(null); } return myDbObject.getData(constraint.toString()); } } </code></pre>
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    1. CO"what options do we have in querying and displaying tens of thousands of rows of data in Android?" --> eh? I can't even think why you might want to do that.
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    2. CO@SK9 This was for porting a medical reference app from iPhone to Android. They literally had tens of thousands of records in these SQLite databases. Any sane person would start entering a search term to narrow down the list but the iPhone app supported manually scrolling through all of the data perfectly fine too. Thus they expected the Android app to behave the same way.
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