Android :: How To Approach The Layout Of A Sortable List
May 7, 2010
I plan to implement an alternative sortable list of images but I do not know how to approach the function of the layout. The plan is to make it look like the playstation 3 media bar. One example of use for this sortable list could be a result set from search for cars. On the x-axis there is model year and on the y-axis there are images of cars that year. BUT I only want the car highlighted that is in the cross of the x and y-axis, all other area grayed out in some way. You are able to navigate through this list in all directions. Make sense?
I would like to know where to start to accomplish this. My first approach was to implement a gridview but I only manage to make it scrollable in one direction.
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Nov 24, 2010
I'm thinking of one that would allow me to narrow the list down based on whether the camera worked or not. Does 4g work? Other features.
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Jun 15, 2009
Has anyone been able to create a sortable ListView (one where you can drag items around to change their order)?
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Aug 14, 2010
I want to create a layout like this:
On the top a TextView, after it a scrollable list of words, in the bottom two buttons.
But in order to create a scrollable list I think I must use ListActivity, but I want to create an Activity so the only scrollable part is the list and the TextView and buttons are fixed.
How can I do this?
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Apr 18, 2010
Find the link to attached file, i need to have this kinda layout. is it possible?? well perhaps it is, but im not getting it how to do it. i want to specify the whole layout in the xml, but it gives runtime error ...
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Jan 30, 2010
I'm attempting to write my first android app and am having a little problem with filling a List Layout from a DB.
The project itself is here:
http://code.google.com/p/biofuelsfinder/
However the specific code ...
The two portions commented out, if run cause and illegalStateException error which then aborts the code.
Below is the stacktrace
W/dalvikvm( 208): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
E/AndroidRuntime( 208): Uncaught handler: thread main exiting due to uncaught exception
E/AndroidRuntime( 208): java.lang.IllegalStateException: Could not execute method of the activity
E/AndroidRuntime( 208): at android.view.View$1.onClick(View.java:2031)
E/AndroidRuntime( 208): at android.view.View.performClick(View.java:2364)
E/AndroidRuntime( 208): at android.view.View.onTouchEvent(View.java:4179)
E/AndroidRuntime( 208): at android.widget.TextView.onTouchEvent(TextView.java:6532)
E/AndroidRuntime( 208): at android.view.View.dispatchTouchEvent(View.java:3709)
E/AndroidRuntime( 208): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
E/AndroidRuntime( 208): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
E/AndroidRuntime( 208): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
E/AndroidRuntime( 208): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
E/AndroidRuntime( 208): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
E/AndroidRuntime( 208): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
E/AndroidRuntime( 208): at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
E/AndroidRuntime( 208): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
E/AndroidRuntime( 208): at android.view.ViewRoot.handleMessage(ViewRoot.java:1690)
E/AndroidRuntime( 208): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 208): at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime( 208): at android.app.ActivityThread.main(ActivityThread.java:4310)
E/AndroidRuntime( 208): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 208): at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime( 208): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
E/AndroidRuntime( 208): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
E/AndroidRuntime( 208): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime( 208): Caused by: java.lang.reflect.InvocationTargetException
E/AndroidRuntime( 208): at com.biofuelsfinder.biofuelsfinder.buttonClickHandler(biofuelsfinder.java:37)
E/AndroidRuntime( 208): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 208): at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime( 208): at android.view.View$1.onClick(View.java:2026)
E/AndroidRuntime( 208): ... 21 more
E/AndroidRuntime( 208): Caused by: java.lang.NullPointerException
E/AndroidRuntime( 208): at com.biofuelsfinder.RetailerList.fillData(RetailerList.java:34)
E/AndroidRuntime( 208): ... 25 more
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Jul 13, 2009
I am struggling with applying a forced line break in the xml layout when using a simple list adapter. The data for the list adapter is being pulled from an sqlite db.
Here is the code:
CODE:.................
And here is the R.layout.item xml:
CODE:...................
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Sep 7, 2010
I have a layout that is three linear layouts. The top has some icons and the middle has a tabhost. Each tabhost has a list inside it. The bottom linearlayout has two buttons that should stay at the bottom on the screen at all times. The problem is when a list in the tabhost gets too long, it displays over the buttons. I tried to find some way to get the buttons to bedisplayed over the list but have failed so far.
CODE:................
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Feb 25, 2012
One of my activities receives some data.I want to obtain a layout like the one for the "contacts" app, which has 1 contact on each row and clicking a row you pass to another activity which shows the details.
What do I need to create the "list" layout?
Are those rows simply TextViews or what else?
How do I generate the rows at runtime into the layout?
If it is too long to write down some code, just tell me what I need and I'll check by myself.
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Dec 23, 2009
In my application I have three buttons that are to be part of each and every activity. These button are independent of each other and on click do mutually exclusive things(say launch different activity). So, in my layout XML for every screen I have a <Linear Layout><Button/><Button/><Button/></Linear Layout> element.
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Oct 11, 2010
I'm navigating through a 3-level hierarchy of names to get to a document view page. I've set up tabs for the 3 levels. The tabs are left, middle, and right where the right tab is the lowest level of the hierarchy. Each tab has a list of 10 to 20 Radio Buttons with the names. This all works great and is very efficient and intuitive. One note is that there may be 1000 documents available (from an online source) but the average user will only be viewing a handful regularly. So I store the choices for each of the 3 tabs. This way a user can quickly navigate to his favorite without having to negotiate the entire hierarchy each time. My question comes when the user is on the right tab. At this point they have navigated through to the document they want and I'm wondering what is the best way to initiate the document view page. Remember that most of the navigation happens on the right tab in the small set of documents the user regularly visits, with only occasional visits to the other tabs. So making the right tab efficient is good. My current approach is to add a LongClickListener to the buttons of the right tab. Then a press-and-hold kicks off the document view. This certainly minimizes the number of objects on the screen and the number of separate clicks required to get to the document but I question whether new users will know that a long press is expected. I guess I could put up some Toast if the user doesn't do anything for 5 seconds but that still seems clunky. Another approach is to add a Button at the top of the right tab Radio Buttons. This has the merit of being dead obvious but it's a less efficient use of screen space and also an extra click for an experienced user.
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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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Jul 12, 2010
I am required to work on an application which is be deployed on devices running Android 1.5. The application is supposed to maintain a connection with a server and regularly poll it for new data. The server will notify the client of new data following which the client will connect to the server and download the data.I know that ideally a push based approach will be more conducive here given that we are to run this on a mobile platform. Also, from Android2.2 there is going to be support for C2DM(Cloud to Cloud device Messaging) but as already mentioned this application is for devices running Android1.5.Implementation: I was thinking of using AlarmManager which would Broadcast Intents periodically(poll interval), The Broadcast receiver will then try to connect to the remote server and make data changed check. If the server has an update, the thread will connect to the remote server and download the data from the server.
Problem and Issues: 1. Is this the right way to approach the problem? 2. Is AlarmManager reliable? Would it remember Alarms after a device boot? (I think it does) 3. How do I ensure that battery usage is kept at minimum.(I have heard something about using "keep-alive" to sustain the session for longer time..what is this legend?) 4. What are other things that I need to consider? I am sure I must be missing lots of things here.
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Nov 24, 2010
I am looking to create an Android application that uses Tabs.
Requirements
- When a user selects a tab and gets back to the same tab, there shouldn't be a loading period (preferably).
- Each tab will contain a listview.
- In one of the tabs, I will have to use subtabs. And that's it.
One great example I really liked (although I didn't try the app) is
http://www.usatoday.com/android/.
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Aug 30, 2010
I have a general Android design question around data access. I have a number of activities in my application that need to access a SQLite database. In order to wrap up all data access logic in one place I have created a DatbaseHandler class that takes care of all data access logic. This class takes care of building up where clauses, calling the database and interrogating the resulting cursor to retrieve the query results and return them to the caller. The purpose of this class is to wrap all data access code in one place so that it can be easily managed and maintained as opposed to having data access logic scattered across all activities. Each activity that needs access to the database creates an instance of this DatabaseHandler class and passes it a reference of android.content.Context. The DatabaseHandler class then uses this Context object to call an underlying content provider as follows context_i.getContentResolver().query(...).
My data access logic (cursor handling logic to be specific) is not in the activity and so I cannot manage the cursors life cycle, therefore there is likely to be memory leaks.
My questions are as follows -
How can I (if its even possible) manage the cursors life cycle from outside an Activity? Should each activity even be creating an instance of this data handler class and passing an instance of Context to it? Perhaps my design approach is wrong and I should expose these data access functions as static methods that take an instance of the calling activity as a parameter. That way I could perform managed queries and let the activity take care of managing the cursors life cycle?
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Dec 29, 2009
I'm trying to animate object. I use keyframe animation: I have two vertex buffers (two frames) with vertices of my object - first buffer is for object start state and second for end state. To transform the object I simply use linear interpolation. To make it more clear, please take a look at the code snippet:
CODE:..................
As you can see I actually use one more buffer. vertexBuffer_motion is the one I use to draw my object in intermediate state.
Time for my question. What is the best approach for such keyframe animation on android? Can I somehow avoid (quite time consuming) operations of calculating and copying new state of all vertices to vertexBuffer_motion?
I know I could use VBO but still, I would have to prepare this vertexBuffer_motion and use glBufferData to set data to this VBO (or not?). provide me with some code example showing the best approach for keyframe animation on android?
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May 8, 2010
I've recently knocked up a server/client app for Windows & Android that allows one to send a file from Windows to an android phone over a socket connection. It works great for a single file but trying to send multiple files over in a single stream is causing me problems. I've also realised that aside from the binary data, I will need to send messages over the socket to indicate error states and other application messages. I have little experience with network programming and and wondering what is the best way forward.Basically the C# server side of the app just goes into a listening state and uses Socket.SendFile to transmit the file. On Android I use the standard Java Socket.getInputStream() to receive the file. That works great for a single file transfer, but how should I handle multiple files and error/messaging information? Do I need to use a different socket for each file? Should I be using a higher level framework to handle this or can I send everything over the single socket? Any other suggestions for frameworks or learning materials?
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Jul 29, 2010
I'm working on an app that is meant to be used by fans of a sport team. In the future, I expect to use the same app but for any different team. So, what changes would be the colors, team logo, app name and the like. So, is there any technique that allows me to build binaries for different teams without having duplicated resources?
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Aug 18, 2010
I used Eclipse with the Android SDK to develop the original application. I ask since this was my first Java (and Eclipse, and Android, and XML) project. I assume that most of the Java should run on the PC without too much trouble. I may want to restructure the code to isolate the Android specific functions. Should I stay with Eclipse or move to something like NetBeans?
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Nov 23, 2010
In my Android application, it is noticed that when the device goes to sleep/standby WiFi is disconnected. When the device wakes up, it gets reconnected. Before making a httpClient.execute(..) call to remote server we check if the device is connected to n/w. When the data transfer is being done and if the device goes to sleep then Android runtime will switch to another medium for connectivity(3G,GPRS etc.)
Is the switch from WiFi to alternate cellular service say 3G, seamless? How do I wait for WiFi to become available again? Should I use Thread.sleep(delay) when the WiFi wakes up? I have seen broadcast actions when the WiFi state changes. In general, what is the ideal approach to handling WiFi disconnects in a mobile app?
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Jul 23, 2010
For my first application, the only testing I've really done to this point is on my Droid X. I want to think through the various hardware differences and come up with a testing plan that is representative of the Android landscape. My initial thought is to create a list of emulators that have unique qualities such as screen size and SDK levels. I've noticed very quickly how the UI of my application will need some adjustment when viewed on devices that don't carry a 4.3" screen. How have you approached this hurdle in your own development? Chris Stewart cstewart...@gmail.com http://www.androidsdkforum.com *Want to advertise your Android application for free? Email me for details!*
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Nov 2, 2009
I'm a total newbie to Android (and to Java in general... mostly a PERL/ PHP guy here...), so forgive me if I use the wrong terminology to refer to things... I have been asked by my company to implement an application for Android that allows a user to enter a note at the end of every call. E.g., either they or the other party hangs up, immediately a notes area pops up with a "save" button and if they enter a note, the note is saved with a reference to the call log entry. As I understand it, onCallStateChange() will give a pretty good indicator of a hangup if the state has become Telephony Manager.CALL_STATE_IDLE. I've figured out how to do the UI part, how to save it in a database, etc... My question, however, is about how I implement this "listening" aspect of it. Should I have a service running all the time that has an instance of android.telephony.PhoneStateListener? If so, do I use the onBind or onStart method, and how do I make sure it doesn't go away when memory runs low? Or can I somehow attach the listener to this event, and then terminate? Or is a Broadcast Receiver the way to go?
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Sep 28, 2010
I have an app in which there are several requests to a server in internet (http), for example to retrieve images in threads outside the main UI process. The thing is that I have a Thread that manage the request with a while(!end) loop and in the end a Thread.sleep(500) that checks if there are new unhandled requests. As I read here [1] I know that this is not a good practice. And users have complain about ANR (app not responding) in several cases.
Knowing that obviously I want to refactor all the way my app manage the requests and I want to do that the best way. So, the question is; what is the best approach for doing this? A service? a broadcast receiver and send intents when I need a request to be handled?
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May 6, 2010
My wish is to know how I can program a mobile website, that fit to all mobile phones.
Are there any special approaches to recognize a device and render the code according to it?
Which tools and coding languages are required?
My first thought was to hold the website in XML, which would be parsed depending on the device.
You have to consider old phones, even devices with only wap support.
For example: The mobile website has to recognize Nokia N75 and render/send the code that looks optimal for this device. Same thing with an iPhone or a Motorola Razr.
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Sep 23, 2010
I am developing an app for android mobiles that communicates with a json/rest web service. I need to make certain kinds of calls periodically to the server to check for some information. Within that context I might need also to query the GPS for the current position. I'm quite undecided to use a Local Service, since I don't know very well how to deal with them, in fact I need to retrieve those data periodically and refresh a MapView accordingly. I heard that I can use PendingIntents,in the service, associate this data as a payload and send them to a broadcast receiver which unpack the data and refresh the UI, I heard also that this is a bad design approach because of what broadcast receiver are intended to be used for.
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Jun 22, 2009
I have tried to understand for the past 2 days what is the best approach to making the value from a variable sitting in activity A (in my case, the int position used in OnListItemClick / OnItemSelectedListener) available in another activity B (which of course sits in another class). There may be the option to write the result of the OnListItemClick int position into a small SQLite DB - but that seems to be total overkill.
Anybody could pls share the best approach with me?
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Jun 15, 2010
I am using following code to display bitmap on screen and having next and previous buttons to change images. and getting out of memory error. New Code
HttpGet httpRequest = null; Code...
So after googling i got new code as answer the old code was not giving me out of memory error on those images but decoder->decode return false, so i choosed new code.
Any one guide me what is the solution and which is the best approach to display live images?
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Jun 4, 2010
We need to make an application that runs on iPhone, Android and BB. What is the best approach to write the least ammount of code? I know about some frameworks but I am not sure the best approach.
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Dec 16, 2009
I want to display search result on the screen, I have implemented in such a way that. From the search form user fill the 'search field' and 'search location' I set values into bean and that bean is static so that I can access it from every where. Then I start search result screen intent using:
Intent mainIntent = new Intent(SearchVenueResults.this, SearchResults.class);
startActivity(mainIntent);
On the 'SearchResults' activity 'oncreate' method I load data on the behalf of static bean which values filled from search form and then display data.
@Override
public void onCreate(Bundle savedInstanceState) { loadDataAndSetupUI();
super.onCreate(savedInstanceState);
}
My question is is it the correct approach to use it or in Android there is another preferable approach?
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Dec 22, 2009
I just read from internet to maintain the state of my application by overriding the onKeyDown function as given below. And set the launch mode of my activity as singleInstance. And it is working perfectly. Just want to know if it is correct approach. And how it is different from onSaveInstanceState.
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