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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I want to display a fancy 'loading' image at my app's startup time.
The problem: my startup code is mostly GUI related, hence needs to run on UI thread.
Is there a way to do both - that is run UI-related code on UI thread while an image is displayed to the user?
Currently I'm successfully loading and displaying an image from a webserver using the code below.
URL imgURL = new URL("http://www.xxx.com/myimage.png"); URLConnection conn = aURL.openConnection(); conn.connect(); InputStream is = conn.getInputStream(); BufferedInputStream bis = new BufferedInputStream(is); bm= BitmapFactory.decodeStream(bis); bis.close(); is.close();
canvas.drawBitmap(bm, 0, 0, null);
What I want to do is load it from a resource. I've put myimage.png into res/drawable and referenced the bitmap as follows :-
Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.myimage);
However when I try to display it with canvas.drawBitmap(bm, 0, 0, null); I get a Force Close. What am I missing?
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.
View 2 Replies View Relatedto 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.
I wish to display data in the the arraylist in a list view. The arraylist is not a generic list but a object defined by me. I want to display only certain data of the object. Something like, an object of a student, I want to display the student's name only, the student id and the student dob is not required.
View 4 Replies View RelatedI want to do a RSS reader, which would display an image (left alignment, text running around it) a Title flowing next to it, and a description, also running around the image.
What is the best method to do this in Android?
I am currently looking in to developing an application for the android platform. I have some information that is stored within the SQLite Database of Android.
What I want to be able to do is to perform a query to the database table and populate a TableLayout with the information from the database table.
I have tried to find this on the Internet but have not had much luck. If anyone can help me to get about doing this would be great.
I want to display a tree like data structure, for the Swing JTree is ideal. Is there any widget that provides that? Or any implementation of Swing for Android?
View 2 Replies View RelatedI am using a PHP script to convert my MySQL database data into JSON data. I am successful in doing so. Now I want to retrieve the data from my PHP script (on my localhost server) and parse that data and display it in a TextView. Everything runs fine, no errors, but the data is not displaying as I think it should. Here is my code for my MainActivity...
[HIGH]package com.example.testexternaldatabase;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.apache.http.HttpEntity;
[code]...
I have a TextView called "result" and I gave permissions to access the internet in my manifest.
I think this is the right place to look for some tips and stuff for android programming ahah. So I am completely new at all this java/android programming. My friend gave me the challenge to parse some json data as a listview. I was succesfully able to display the content as a textview however not everything appeared. Only the last few line of text showed up. He told me that by putting it as a listview everything should go well. Now setting up a listview isn't the same thing as setting up a textview. So my question is with all the code that I have how can I display the content as a listview.
[HIGH]DefaultHttpClient httpclient = new DefaultHttpClient(new BasicHttpParams());
HttpPost httppost = new HttpPost("http://ec2-54-213-155-95.us-west-
[code].....
I'm trying to load the parsed HTML data from an rss feed using a WebView, but the webview claims...
View 3 Replies View RelatedI want to set a TextView with SpannableString which is from the method below: Html.fromHtml(String source, Html.ImageGetter imageGetter, Html.TagHandler tagHandler) But the ImageGetter here need to override the method below: public abstract Drawable getDrawable (String source) Because I need to get the drawable from the internet, I have to do it asynchronously and seems it is not.
View 1 Replies View RelatedI 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.
View 2 Replies View RelatedI 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?
View 3 Replies View RelatedI 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?
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.
View 4 Replies View RelatedI read somewhere (and have observed) that starting threads is slow. I always assumed that AsyncTask created and reused a single thread because it required being started inside the UI thread. The following (anonymized) code is called from a ListAdapter's getView method to load images asynchronously. It works well until the user moves the list quickly, and then it becomes "janky".
final File imageFile = new File(getCacheDir().getPath() + "/img/" + p.image);
image.setVisibility(View.GONE);
view.findViewById(R.id.imageLoading).setVisibility(View.VISIBLE);
(new AsyncTask<Void, Void, Bitmap>() {
@Override
protected Bitmap doInBackground(Void... params) {
try {....
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.
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");
} }
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?
View 2 Replies View RelatedI 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.
Does anybody have an example of lazy loading (about 10,000 items) an Android ListView from a Sqlite databse?
View 1 Replies View RelatedI 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?
View 8 Replies View RelatedI'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]...
I download apps from play store, amazon appstore and other places..
When I restart my phone, Some apps (no matter where are they from (play, amazon, etc.)) They stop working.. they dont work anymore.. and I will have to re install the apps again and loss all data
And also some apps that still work, they start like its the first time I am starting them and all data in them are lost..
I tried multiple things to fix this like I factory reset my phone and also tried to flash new version of stock rom but I still have this problem.
My device: Galaxy Note 2, jelly bean 4.1.2, rooted (no custom rom indtslled)
I tried to do this code...
something to do with the Thread.sleep() method blocking. so can someone show me how to implement a timer "asynchronously"?
I've looked through the documentation and I can't seem to figure out how to have the screen blured/greyed when I select an activity that may take a while to load.
This seems to be an Android standard (both the Camera app and the Camcorder app do it when first selected), but I don't see any documentation on it. I even tried looking through the source of these apps on git, but couldn't seem to find it.
I'm making an Android Java app game (although this question applies to all languages really) and hope to release the first version soon. I'm nervous about how I save data in my game. My problem is that, if in a later update, I decide to store more data or store the same data in a different way, I need to be careful I don't lose or corrupt data for users that upgrade (i.e. I want users to be able to use data created by an old version in the new version, like their high scores from before).For example, say I want to save high scores in version 1.
View 3 Replies View RelatedIn 1.6 sdk, map is not displaying, i put all the permissions and uses- library in manifest, added the external map.jar from add-on... created AVD manager with google-API 4.But when running, its showing
11-10 15:31:00.255: ERROR/AndroidRuntime(1587): Uncaught handler: thread main exiting due to uncaught exception
11-10 15:31:00.295: ERROR/AndroidRuntime(1587): java.lang.NoClassDefFoundError: com.nithin.ViewMap
11-10 15:31:00.295: ERROR/AndroidRuntime(1587): Caused by: java.lang.IllegalAccessError: cross-loader access from pre-verified class