带有数据库图像的 GridView
我的数据库中有图像,我通过以下代码将其放入我的 GridView:
public void setNotes()
{
String[] columns = {NotesDbAdapt.KEY_ID, NotesDbAdapt.KEY_IMG, NotesDbAdapt.KEY_NAME, NotesDbAdapt.KEY_DATE, NotesDbAdapt.KEY_TIME};
String table = NotesDbAdapt.NOTES_TABLE;
Cursor c = MainNote.mDB.getHandle().query(table, columns, null, null, null, null, null);
startManagingCursor(c);
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
R.layout.file_dialog_row,
c,
new String[] {NotesDbAdapt.KEY_IMG, NotesDbAdapt.KEY_NAME, NotesDbAdapt.KEY_DATE, NotesDbAdapt.KEY_TIME},
new int[] {R.id.img, R.id.txt, R.id.date, R.id.time});
adapter.setViewBinder(new NotesBinder());
gridview.setAdapter(adapter);
}
一切正常,但是滚动很慢,不稳定。似乎信息每次都从数据库获取。如何修复它?
I have images in my DB and I put it to my GridView by this code:
public void setNotes()
{
String[] columns = {NotesDbAdapt.KEY_ID, NotesDbAdapt.KEY_IMG, NotesDbAdapt.KEY_NAME, NotesDbAdapt.KEY_DATE, NotesDbAdapt.KEY_TIME};
String table = NotesDbAdapt.NOTES_TABLE;
Cursor c = MainNote.mDB.getHandle().query(table, columns, null, null, null, null, null);
startManagingCursor(c);
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
R.layout.file_dialog_row,
c,
new String[] {NotesDbAdapt.KEY_IMG, NotesDbAdapt.KEY_NAME, NotesDbAdapt.KEY_DATE, NotesDbAdapt.KEY_TIME},
new int[] {R.id.img, R.id.txt, R.id.date, R.id.time});
adapter.setViewBinder(new NotesBinder());
gridview.setAdapter(adapter);
}
All ok, but but the scrolling is slow, jerky. Seems that information takes from DB every time. How to fix it?
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此方法在 API 级别 11 中已弃用。请改用带有 LoaderManager 的新 CursorLoader 类。它可以在后台线程上执行游标查询,这样就不会阻塞应用程序的 UI。
This method was deprecated in API level 11. Use the new CursorLoader class with LoaderManager instead. It can perform the cursor query on a background thread so that it does not block the application's UI.