Android :: Loading New Data With Back Button
Apr 10, 2009
I have a message application so that on view 1 is displayed a list of messages and when you go to view 2 (subactivity) you can send a message. I want the program to work so that when you hit the android back button, you can go back to view 1 and see the list of messages including the new message. Right now only the old data is displayed, and I noticed that displayContent() is not called when going back which I assumed it would. Is there any way to specify that when the back button is hit, to call displayContent() again on the previous activity?
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Apr 7, 2010
I have a link in my application that triggers a webview to open from webview.loadUrl. Sometimes it's takes quite a while to load the page, and in these cases I want to be able to use the built in back button on the phone to cancel the loading and go back to my application. How do I do this? Is there some way I can listen to the back button while loading the URL?
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Nov 9, 2010
I need to develop an application with downloads the data at the background and update about the progress in the front.
I guess this can be achieved using services and activity and passing data in between the. But, what I need to do is even if I hit back button and then start the activity again. It should check if the service is running or not. If service is not running it should start one else it should display the data from running service.
Something like music player where music is played by a service at a background and activity displays the information. Even on browsing through other activities of the application or hitting back, state of the music player is maintained.
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Mar 15, 2010
My question is about restoring complex activity related data when coming back to the activity using the "back" button". Activity A has a ListView which is connected to Array Adapter serving as its data source - this happens in on Create(). By default, if I move to activity B and press "back" to get back to activity A, does my list stay intact with all the data or do I just get visual "copy" of the screen but the data is lost? What can I do when more than activities are involved? Let's say activity A starts activity B which starts activity C and then I press "back" twice to get to A. How do I ensure the integrity of the A's data when it gets back to the foreground? Prefs Manager does not seem to handle complex object very intuitively.
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Mar 2, 2010
For my CS bachelors I am doing a Senior project using android and google maps.My vision was to do a (relatively) simple Dijkstra shortest path using google maps road data. I was going to add elevation change along with 2D distance. I am doing well playing with maps in android but I am completely stumped trying to access google maps data in any sort of searchable form.How would I go about accessing the data for say intersections of roads (lat/long) in a particular area?There has to be a way to pull that data in some sort of tree form. It seems like it may be possible with kml?Any pointers would be awesome.I want my paths to follow roads but If i cant this is going to turn into an orienteering application fairly fast.
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Jun 23, 2010
to start with I've gone through the entire notepad tutorial, I'm a professional game programmer who has some extra time. (though most of my time has been in C++, I did take a year or two of Java classes in college, and remember some of it). I'm not sure the site is a good site to ask questions like this.. If someone has a Forum that might be a good place to ask these newbie questions, please feel free to point me in the direction. I've examined a few of the samples, and think I've a grasp of what I want to do. I've a three to four project plan for some Android releases to sharpen my skills, but since this is my first project and I have never really developed for a mobile phone or the android before, I'd like to make sure I have a solid plan.The first project is an example of the license plate game, however I want to do a few things to change it. Heck maybe when I'm done it'll become a bingo style game, with bluetooth connectivity, you never know. The base idea is I want to offer a list of states, with checkboxes next to them. so to do this, I'll be starting with a Linear List layout similar to the note pad example, and then have a row that is only a Checkbox. I can use text and call strike through if it's been checked off. Perhaps offer an option to not show them if they are checked.
But I want the list to be generated from a set of lists. Maybe all of America's states, maybe reasonable American states (no Hawaii, no Alaska) maybe a North American list, (add in Mexico and some Canadian provinces), a European list, who knows. I'd probably have to have a pop up window that lists all of the lists I suppose using a radiogroup of some sort. So then as far as the data, after weighing options I think best solution is to make a database with two fields, "checked" and "name".I figure I can use the menu for most of the user interaction (aside from clicking on stuff we want to check off) with maybe a few context menu items, I understand how to make all of those already so I should be good. The question I have is what is the best way to populate the lists? Should I create raw data, and have different files for all the lists? Or is there some other way to do this? I've seen this done on the searchable dictionary, but I'd like to hear what people who have actually generated the data like this before. In addition is there an easy way to look at the sql database these applications create, or do you have to run searches on them and output the data? Finally any other suggestion or advice? I definitely want to try to get something like this on the market so I can see the full life cycle and see if anyone actually likes it. (luckily there's not a plethora of them already) but I also want a few people to look over my code if they're willing when I'm done to make sure I've done this right or at least not missing any basic mistakes.
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Jul 15, 2010
This is my first android device and i'm loving it... but one thing that irks me is the use, or lack thereof, of the back button.
As I am navigating menus and options in the Settings, I cannot simply go back one menu using the back key. For example, if I go to Settings->Battery Manager->Battery Profile Options and want to go back to the Settings screen, I cannot.
Pushing the back button does nothing and I can only go back to the Settings menu by going Home, then re-entering.
Another quirk regarding the back button is when reading emails. Using a regular email account such as Hotmail, I cannot simply read an email and go back to the inbox using the button.
It makes navigating the phone very tedious.
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Sep 2, 2010
I have 3 activities in my app: Activity1 -> Activity2 -> Activity3. Inside Activity3, if the user presses Back, I would like to return to Activity2. In Activity3's onPause event, I added a finish() statement. That's probably not even necessary, but I wanted to make sure this Activity gets cleaned up. This works fine.
However, while in Activity3, if the user presses Home or starts a new app (through notification bar or some other means), I want both Activity3 and Activity2 to finish. If the user returns to this app, he should resume with Activity1.
I have figured out how to do one or the other, but I can't figure out how to handle both cases, if it's even possible. Can I trap the "Back" button in Activity3 and send a message back to Activity2 telling it not to finish()? It seems like the Activities follow the same lifecycle flow (Pause, Stop) regardless of what you do to send them to the background. Just to answer the question of why I want this behavior, imagine that Activity1 is a login screen, Activity2 is a selection screen, and Activity3 is a content screen. If I press Back from the content page, I want to be able to make a new selection. If I exit via any other means (Home, notification bar), I want the user to be "logged out".
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Mar 31, 2009
I call WebView.clearHistory(), but I am still able to go back after doing so. I want to reuse a WebView, but I don't want the back button to allow the user to go back further than the current "session" of using the WebView. Anybody know what is the best way to handle this? I thought for sure that clearHistory() would do it.
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Oct 11, 2010
In my android application i have a video list screen,a buffering screen and a videoplayer screen.
As soon as the user clicks an item from videolist screen ,he is navigated to buffering screen and then to videoplayer.
In the buffering screen i am using Async task and doing the loading process in on background process.
Now my issue is like the user if has selested a video then gets navigated to buffering screen.But if the user clicks back when he is in buffering screen then initially he is getting navigated to videolist screen but immediately after that again he is navigated to videoplayer screen.
What i would like to have is either the back button should be made disable in buffering or should prevent the player tostart if back is clicked.
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Jun 16, 2009
In My code I am displaying a AlertDialog based on some condition.
CODE:.......................
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Nov 17, 2010
in my android application there are number of images in drawable folder. in my layout two buttons: back and forward button.on clicking next and back buttons different-2 image get loaded on the same layout(common for all images). Problem:i am able to load images in next button click but as i click on back button no image got loaded.
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Jul 19, 2010
I'm finding that I'm using the back button A LOT whether browsing the web or just navigating the OS. It kind of sucks because the buttons on the droid x are well, really small, and sometimes hard to press because they are so narrow and flimsy feeling. And depending on how you are holding the phone, it could be a good bit of distance for your thumb to travel or I'm finding myself having to reposition the phone in my hands just to reach the back button, which you seem to need very frequently.
Anyone know of any kind of back 'swipe' implementation ? Like some software you can install that makes it if you swipe left to right on maybe the top bar it goes back?
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Jan 1, 2010
I'm trying to load the parsed HTML data from an rss feed using a WebView, but the webview claims...
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May 5, 2010
Instead of trying to grab the notification bar and swiping it down, simply start ABOVE the screen and swipe down. Fast or slow makes no difference.
You can swipe it back up, or simply hit the back button.
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Sep 8, 2013
In the last few days I am having to press the back button twice when using both the stock android browser and the latest version of chrome on my rooted S3.
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Oct 8, 2009
I just tried a stupid approach and it crashed my app... Basically I have an activity that has three tabs (containing three activities). Each of the tabs gets its input from an xml file downloaded off the net. Everything is fine but when I start my app, it has download the xml file and there's a "wait" time for this.I managed to get around this by adding a splash screen. It looks beautiful but the problem is when I click on the second tab, it still has to get the list off the net, so it looks ugly now... It waits before displaying the list. So what I did was design an AsyncTask that just downloads the xml file. In my main activity, I spawn two tasks initially and send the URL and Intent as parameters. And inside the activities that start inside the tabs, I use a wait(). Inside the AsyncTask, after it is done with the download, I notify the Intent using notify(). This crashed! Of course, I didn't expect it to work but just wanted to try :) Writing it so that I can either get a feedback as to why this failed or to prevent others from wasting their time on this...Now, I am sure many face the problem of a "wait" time inside the tabs. How do I solve this? I am thinking of either dimming the screen and then displaying a series of toasts or display a progress indicator inside the tabs or pre-fetching the xml files... I don't have a clue on how these can be achieved.
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Aug 1, 2010
I have got list that is filled with data from internet.
Datas are downloaded in chunks. At the end of the list next portion of data is downloaded and added to the list.
I'm detecting list end with help of onScrollListner:
CODE:........
I would like to addLoading... row when datas are being downloaded. Something similar to Gmail loading row at the end of the list.
I know that I can hack adapter.getCount() to return size + 1 and force adapter.getView to display loading... at the end of the list.
How can I do that in more elegant way?
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Jan 20, 2009
My application needs to load and process some data at the startup which delays the displaying of the GUI quite a bit. I addressed that problem by starting a new thread to load and process the data. It solves the problem nicely, but is there a better way to do asynchronous processing in Android applications that I missed?
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Dec 1, 2009
I just purchased my Driod on Wednesday. I took it back today because it kept on freezing. They gave me a new one, but for the last 6 hours it has been "loading data, Please wait...". The Verizon store had no clue what was going on. It is in the task bar.
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Sep 29, 2010
I have multiple ListActivity(s) with a custom ArrayAdapter. I have to load an XML file from the Web, and the user moves to a new activity by selecting a list item.
What is best practice for:
Displaying a loading indication to the user.
Threading the networking stuff so that the user can cancel the loading of the data if need be / move to the previous activity.
Example/source code would be greatly appreciated - I've used http://www.helloandroid.com/tutorials/newsdroid-rss-reader as an introduction, however it doesn't display a loading indication.
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May 27, 2009
when I load external web page, image or javascript file from local webpage. I can't see external image and can't load javascript or webpage. But I can only see local image. Why I can't load external javascript, webpage or image? Here is the HTML source. (of course, I filled right [daum open API key])
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http:// www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <meta
http-equiv ="Content-Type" content="text/html;
charset=UTF-8"> <title>Daum 지도 API</title>
<script type="text/javascript"
src="http://apis.daum.net/maps/maps.js?
apikey=[daum open API key]" charset="utf-8"></script> </head> <body>
<div id="map" style="width:600px;
height:400px;
" style="border:1px solid #000">
</div> <img src="http://4.bp.blogspot.com/_2-7AdSkZA7I/RlCnDhD3ZfI/ AAAAAAAAE9U/LEHMtyVLdY8/s400/CutyTale10.jpg">
<img src="file:///android_asset/coffeebean.jpg">
<script type="text/javascript">
var map = new DMap("map", {point:new DLatLng(37.48879895934866, 127.03130020103005), level:2} );
</script> <iframe src="http://www.daum.com" width="300" height="150"></iframe> </body> </html>
and I use this Activity source
package bo.my.android.test;
import android.app.Activity;
import android.os.Bundle; import android.webkit.WebView;
public class OpenAPITest extends Activity {
WebView webView;
/** Called when the activity is first created. */
@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
setContentView(R.layout.main);
webView = (WebView) findViewById(R.id.webView1);
webView.setWebViewClient(new DaumMapClient());
webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl("file:///android_asset/daummap.html");
//webView.loadUrl("http://www.daum.net");
} }
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Jun 12, 2010
I have got an htc hero device and would like to install my apk on it. It successfully installs my apk but without the database it is using. My database is populated prior to running the application, so it runs ok on the emulator. But I couldn't load my data on the real device and the apk is displaying forse close error. How to load my data on the data folder of the device including every detailed steps?
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Oct 7, 2010
I just received a warranty exchange Samsung Vibrant, & I am currently in the process of putting all my apps onto it. I have the widget on my home screen. The widget seems to be working, but the "loading data please wait" message is still displayed in my notification drawer & the little circle of dots is still in the task bar up top.
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May 22, 2010
Today I tried to restore my phone back to stock ROM and as I was trying to get into recovery mode and complete a nand restore but it wouldn't let me get in. It would just reboot me back into bootloader. I tried updating my superboot and recovery image to 1.7 and it's just stuck at the loading screen now. Is there anyway to restore it?
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Mar 4, 2010
Does anybody have an example of lazy loading (about 10,000 items) an Android ListView from a Sqlite databse?
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Nov 25, 2009
I have a message -- saying Loading Data, please wait -- but it's been a long time. What does this mean? How can I make it stop?
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Jan 4, 2010
On pressing the back button, I'd like my application to go into the stopped state, rather than the destroyed state. In the Android docs it states: not all activities have the behavior that they are destroyed when BACK is pressed. When the user starts playing music in the Music application and then presses BACK, the application overrides the normal back behavior, preventing the player activity from being destroyed, and continues playing music, even though its activity is no longer visible
How do I replicate this functionality in my own application? I think there must be three possibilities.
1) Capture the back button press (as below) and then call whatever method(s) the home button calls...........
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Sep 1, 2009
Trying to the do as the title describes with the following code, but it doesn't seem to work. It just does nothing once i have altered the keyCode. Do i have to do something to the event?
..............
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Feb 7, 2013
I'm pretty new to Android development and I just hit a brick wall in the development of an app, I'm currently working on.
The problem is that I have a list of locations (states), and when one is selected, a list of cities from that state is loaded via http request and JSON and then is supposed to be inserted into a listview in another activity.
So now I have the StateList activity and the CityList activity. Currently, the statelist activity starts the citylist activity via an intent and gives it a state name. Then, the citylist activity uses that name and requests data from a server via AsyncTask. As result I get an array of City objects, which are supposed to be inserted into an adapter for a listview.
Now begins my problem: I don't want the second activity to show up before all data is loaded. I also don't want the first activity to do the request and then have to transfer the whole result to the second activity using intent extras.
So what would I have to do now to have the second activity load all the data and only then really show up? I tried only setting the content view after receiving the data, but since the base class onCreate() is tied to some manipulation of the layout, I would also have to call onCreate() at that point, which is not allowed.
Here some code snippets of what I tried already:
The onCreate() method of my second activity (which is supposed to hide):
[high]protected void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
// send request for citylist data
CitylistRequest request = new CitylistRequest(this, new State(0, getIntent().getExtras().getString("state")));
request.execute();
[Code]...
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