Android : Database Vs Filesystem / Gallery App For Holding List View Of Pictures
Apr 13, 2010
I am new on android and building an application which uses webservice to collect user information in XML. I also get path for a small jpeg picture of each user. (Currently there are about 200 users) I am parsing the XML and storing the information in SQLiteDatabase. Pictures are stored as blob and able to retrieve them.
I display names of users on listview with images as well. But is this a good solution for storing pictures in SQLite Database ? or should consider storing it in file system ? Which is suitable in terms of performance , as well as memory and any other pro and cons on Android.
Also like to know which is best performing XML parser for Android ?
My purpose is only to parse xml files which I get through web services and sort out the data to store in storage. And lastly my memory goes off easily when I load all images to display in list view after making thumbnails of each (which is obvious).
Was wondering is there any library/framework/app available which dynamically loads images as and when required (when that list item is on display) something like Gallery program ?
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Jan 14, 2014
I received a Text message sent from an E-Mail and I was wondering if it was possible to find the individual file on the filesystem holding the metadata for the E-Mail.
If so, would I have to root the phone? And where would that file be located?
I'm a techie, so no need to warn me that I could hurt my phone or files - I'm only looking to READ, not WRITE, and I'd be making a copy of that file beforehand anyways and porting it to a PC in order to check it with whatever program is necessary to decrypt (Probably only need a hex editor.)
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Jul 24, 2010
I can't believe they removed the cool 3D gallery application, which will automatically show your Picassa pics, for the new crappy one. Here are some instructions and a link to add the old one to your Droid X so you can view and share Picasa pics!
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Aug 31, 2010
How can I show pictures in WebView without saving images into file system?
I have tried to implement my custom Content Provider, but method openFile returns ParcelFileDescriptor that points into filesystem (or socket). My pictures are in filesystem, but in encrypted form.
I have tried also URL.setURLStreamHandlerFactory, but in android java it is useless (because custom streamHandler can be register in jvm that is not allowed). I also try html code "img src="data:image.gif;base64,R0lGODlhiAAkAMQAANOOk...", but in embedded chrome it's not working.
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Nov 24, 2010
I have created a table named train_table in SQLite database with 3 columns. they are train_id, train_no and train_name. Now, i wrote a class in which i displayed the train_name in a list view. how do i get the related train_no in the next page? can anyone help me in sorting this problem.?
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Nov 3, 2010
I am on Android 2.1 and I have one multi column Custom listview Using BaseAdapter with an editable edittext at the end of the listview. If the data in the listview do not contain the data of user choice then user should be able to enter data. If the data is already there in the list user will be able to select the data using custom selector. If a selection is made in the list view and user wanted to enter data in the text field at the bottom after selection then the marker in the list view should be unselected. I tried to use onclick() method on edit text using click listener. First time when it is clicked, edit text is getting focus and onclick() method is not fired. And when it is clicked second time, onclick() method is fired and notifyDataSetChanged() method is called. I tried to call the notifyDataSetChanged() method from the Focus Listener, list view selection is gone in my first attempt and edit text is not receiving any data input from the keyboard (frozen).
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Feb 6, 2009
I'm trying to set the selection of a Gallery in code. I would like to have the Gallery smoothly roll down a few items over the duration of a second or two. At frist glance, it appears that two members would to the trick:Gallery.setAnimationDuration(int animationDurationMillis); Gallery.setSelection(int position, boolean animate); It turns out that the setAnimationDuration only seems to affect the rubber-bandy "return-to-center" effect of the Gallery. In other words, when a gallery comes to rest after a fling, and a gallery item is off center, the animationDurationMillis is used to control the duration of the Gallery centering up the item. However, the value seems to have no effect on the setSelection. No matter what value is set with setAnimationDuration, the Gallery seems to render about 2 or 3 frames when flying between items 1 and 10 for example. Is this working as designed? Does anyone know a trick or workaround that would let me properly animate setSelection? I'd be especially grateful if we could do it with an "Ease Out" effect.
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Apr 4, 2010
I'd like to show another List View 'B' after clicking a item of List View 'A'. I use onListItemClick event in Android 1.6 project.
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Jun 8, 2010
Is it possible to have a horizontal list view with an vertical list view? I would like to horizontal list scroll within a vertical list scroll.
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Aug 2, 2010
I am trying to set up a ViewFlipper that changes a SlidingDrawers content each time a button is pressed. So far every view I set up worked fine, but now I am trying to create a ListView (including single_choice_mode) within a child view of the ViewFlipper, but my attempt only let to a NullPointerException. As I only discovered ViewFlipper today, I am not yet familiar with it and may not have understood it completely. if someone could give me a hand and help me find out what I have done wrong, that would be great. Here is what I have done:
The code for the onClick event of the ImageButtons:
public void onClick(View v){
if (v == btnExposure){
mFlipper.setDisplayedChild(0); }
else if (v == btnProperties){
mFlipper.setDisplayedChild(1);}
else if (v == btnSpecialEffects){
mFlipper.setDisplayedChild(2);.............
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Aug 8, 2010
I was wondering if anyone knows how to sort pictures so that the newer pictures are at the beginning of the list? The default is that new pictures are all the way at the bottom, and since I have over a hundred pictures its annoying to scroll all the way to the bottom. I don't see any option to sort the pictures in any other way.
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Apr 23, 2010
I'm trying to create a multiple selection list where the selection is represented graphically rather than with checkboxes.My list has checkboxes, but I want them to serve a different purpose. I'm using a cursor to hold my data and created a custom view binder for the SimpleCursorAdapter. I did this for the checkboxes and general flexibility.So far I haven't even been able to show one line as being selected. I've enabled multiple selection on the list and denied the children of the list item focusability. I've tried manually changing background color with the position fed in through the list item click listener. But the wrong items get changed and they don't even change to the right color. I've enabled touch focusability with no improvement either.Ideally, I'd like the trackball highlight focus bar to appear in multiple places. But I don't think this is possible unless you use the drawable directly. But I don't know how to find or apply it. My next idea was to have a slim view bar that changes color. But I had the same problem with the wrong item being selected so I never finished trying to guess the index position to see if this would work. My most recent idea is to completely swap out the view for another one if it's selected. But I have no idea how to do this either. I'm thinking of using an array list to store the _id s of the items that need a different view to get around the wierd selection problem. I'm also thinking of passing in the ID field as my from and the selection view as the to for my adapter. Then I'd intercept it with my binder and change the view accordingly. But once again, I'm not sure how to do this successfuly.
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May 3, 2010
I am trying to display the text from json in a list view.But my problem is that i cant figure out how to display them in list view. I also want to get only some of the text from url(for example, alerttext and date). Can anyone help me in declaring the list adapter and list view in order to display the data in the way i want.
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Jul 14, 2010
By Default in the Listview,focus will come on the list item.Instead of that, can I get only the border to the list item?I can achieve this by using a transparent image as a list selector.Is there any other simplest way to achieve this requirement?
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Mar 11, 2010
I've tried to add a TextView before a ListView in a LinearLayout. The result is that the ListView wont show at all. The same thing happens if I put the TextView after the ListView, but then I will only see the ListView. Is there a way to get a text view above the ListView without to much of a hassle?
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Jun 25, 2010
In my app i'm setting background to each child views in listview. So that listview default focus ( orange color ) is not focusing. Is there any way to set both ( listview focus & child view background)?
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Jul 27, 2010
Please advice how to set fixed heigh (in dip) for the child view of ListView component? I am using relative layout as root layout for the child view when I set backgoround image to relative layout it becomes very height (maybe because backgoround picture is large) and I want to set precisely the height in dp.
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Apr 12, 2010
Can someone tell me how to save my pictures to my sd card? the ones I take with the camera.
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Nov 11, 2010
Is there a good way to add new image resources(from SD card) to a gallery widget at runtime?
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Oct 1, 2010
but no use even if try increasing the minheight....
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<!-- Here you put the rest of your current view-->
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"........................
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Aug 4, 2010
I am working on an application where I need to display some locations on a map and in a list view where the user should be able to toggle between these views(activities?). I want the toggle button(s) to be in my custom titlebar like in the images (if they are attached). What is the best practice for this? Tab view seems like a solution but can I customize the tab buttons? Should the map and list be in different activities or the same? Now I have two different activities one extending MapActivity and one extending ListActivity but no way to toggle between them. Is it possible to load activities into a FrameLayout?
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Sep 2, 2010
In my code i have state for each row of content so in list view if row has state as read, i need to display it with opacity/ transparency but for the view there is no direct method to set alpha.
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Aug 20, 2010
I want to be able to tell if a view is visible in my listview, which is populated by a custom CursorAdapter. How can I do this?
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Oct 6, 2010
I'm working on my new project but I can't figure out how to add a text under my Gallery.
I have 3 pictures, if I slide on picture 2 I can see under picture 1 and 3 the correct description but it doesn't appear the description under the selected picture (in this case the number 2).
This is my code...
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Jun 12, 2010
I am new to android, I have learned how to display drawable pic in gallery,
and display a url pic use ImageView. Now I dont know how to display online pictures in gallery. Should I use listview or not? In addtion, I want to know how to get pictures urls from flickrs with given userid
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Sep 12, 2010
I have two "download" folders on the SD card. When I mount the card, I only see one folder, so I see only one set of pictures. In the gallery, I can access the other download folder and see the pictures, but when I navigate to what seems to be that very folder, I only see a bunch of apk files. how to "export" the folders from that download folder?
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Sep 13, 2010
I can't seem to use my hdmi out for anything but videos and youtube is it possible to do a slidshow of your pics also?
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Jul 18, 2010
I have a click event hooked up to my listview.I need to pass a string param to the new intent based on which listitem they clicked on. The value I want to pass is in the listitem called txt_Genus. How do I get that value out of the listitem to pass to the intent?
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Jun 24, 2010
Is there a way to get the first visible View out of the ListView in Android?I can get the data that backs the first View in the Adapter but it seems I can't get the first View in ListView.I want to change the first visible view after a scroll action finished. I know that I should not save references to the view.
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Sep 27, 2010
I am new to this smart phone business. Was wondering if anyone knew how to save Facebook pictures to my gallery. Want to edit some, but do not know.
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