sqlite - android database returning no records but sqlitebrowser contains data -


i have problem database file not being read have added database file in assets called mydb when run code says not being located. calling toast toast.maketext(this, "no contact found", toast.length_long).show(); being called because no records being returned. know finding file there no filenotfoundexception exception. example form android application development book.

public class databaseactivity extends activity {     /** called when activity first created. */     textview quest, response1, response2;     @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.main);         textview quest = (textview) findviewbyid(r.id.quest);           try {                        string destpath = "/data/data/" + getpackagename() + "/databases/mydb";             file f = new file(destpath);                         if (!f.exists()) {                           copydb( getbasecontext().getassets().open("mydb"),                      new fileoutputstream(destpath));             }         } catch (filenotfoundexception e) {                      e.printstacktrace();         } catch (ioexception e) {             e.printstacktrace();         }          dbadapter db = new dbadapter(this);            //---get contact---         db.open();         cursor c = db.getcontact(2);         if (c.movetofirst())                     displaycontact(c);         else             toast.maketext(this, "no contact found", toast.length_long).show();         db.close();        }      public void copydb(inputstream inputstream, outputstream outputstream)      throws ioexception {         //---copy 1k bytes @ time---         byte[] buffer = new byte[1024];         int length;         while ((length = inputstream.read(buffer)) > 0) {             outputstream.write(buffer, 0, length);         }         inputstream.close();         outputstream.close();     }      public void displaycontact(cursor c)     {     quest.settext(string.valueof(c.getstring(1)));               //quest.settext(string.valueof("this text string"));         }  }

is there better way upload data.

a couple of things come mind here...

  1. because of !f.exists() check, once database exists (and maybe empty) never copy again. maybe now, copy time, until work out kinks , add in !f.exists()

  2. i've had mixed results e.printstacktrace(), maybe change log.e(tag, "message", e) , see if start seeing errors showing in logcat

as better way... i've done couple different ways... 1. create file (json, cvs, etc) , process , load it, if database empty 2. similar first, except create java serialized object array , load database, if database empty.

also don't know dbadapter looks like, , since wraps database issue may there.


Comments

Post a Comment

Popular posts from this blog

java - Play! framework 2.0: How to display multiple image? -

i need display gallery of photos. here template: @(photos: list[photo]) @title = { <bold>gallery</bold> } @main(title,"photo"){ <ul class="thumbnails"> @for(photo <- photos) { <li class="span3"> <a href="#" class="thumbnail"> <img src="@photo.path" alt=""> </a> </li> } </ul> } and here controller method: public static result getphotos() { return ok(views.html.photo.gallery.render(photo.get())); } and here photo bean : @entity public class photo extends model { @id public long id; @required public string label; public string path; public photo(string path, string label) { this.path = path; this.label = label; } private static finder<long, photo> find = new finder<long, photo>( long.class, photo.class); public static list<phot...
Read more

gmail - Is there any documentation for read-only access to the Google Contacts API? -

i want read-only access user's google contacts. there stackoverflow member wanted this, , received following answer : yes, there is, use https://www.googleapis.com/auth/contacts.readonly scope , "view contacts". this exchange reference read-only access google contacts can find using google. simply using access token obtained attempt read usual google contacts api (i.e. https://www.google.com/m8/feeds ) fails insufficient permissions. similarly, using google contacts api on new target fails 404 errors (for example https://www.googleapis.com/auth/contacts.readonly/default/full ). is there documentation anywhere on how use api, or permissible way access google contacts api full read-write access?
Read more

php - Controller/JToolBar not working in Joomla 2.5 -

relevant code: jtoolbarhelper::custom('savecategories', 'save', '', 'save', false, false); ... <input type="hidden" name="controller" value="easyblogcontroller"> according can dig docs , own previous questions, should call savecategories() function in easyblogcontroller . i've tried setting value easyblog , easyblog.php (file name) current easyblogcontroller (class name). clicking on save button refreshes page. not redirect, echo or var_dump test code put in savecategories() function. var_dump ing jrequest::getvar('controller') , 'task' return correct values. creating controller object , using $controller->execute('task'); works. the values going depend on location of controller trying call, , have couple options here. typically there controller in base folder of component (likely components/com_easyblog) in file called controller.php , class name inside ...
Read more