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  • android mobile development performance vs extensibility

    - by mixm
    im developing a game in android, and i've been thinking about subdividing many of the elements of the game (e.g. game objects) into separate classes and sub-classes. but i know that method calls to these objects will cause some overhead. would it be better to improve performance or to improve extensibility?

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  • Android Video View - Fails to Load file from SD Card

    - by MasterGaurav
    Hi, I have an activity that uses VideoView and MediaController. I have a .mp4 file. (1) When I put the file in res/raw folder, I can play the video using Uri.parse("android.resource://<package>/" + R.raw.id_video) (2) However, when I put the same file in the file-system, it plays properly. I use videoView.setVideoPath("/sdcard/myfile.mp4"); What can be the problem? -- Happy Hacking, Gaurav www.mastergaurav.com

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  • Lost cert for published app

    - by John in MD
    I have a free app published in Android market. I have lost the certificate used to sign the current version but I want to publish an updated version. Android market refuses to accept my upgrade because it is signed by a new certificate. I realize the users will have to uninstall the current version to get the upgrade but it's not clear how to get the updated version into the market so that the current users will find it. What are my options? Thanks, John

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  • [Android] SocketException (The system call was cancelled)

    - by cat
    Hi. I am working on a android project and I need to connect the gPhone with the PC using UDP socket. The same operation, sending a message to from gPhone to the PC, returns different results in different time: Sometimes succeeded and sometimes throws a SocketExcepton(The system call was cancelled). Can anyone tell me what possibly results in this SocketException? Thanks in advance!

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  • Android: Goto HTTP Url on Button Click

    - by George
    Hi all, I want to go to a web page on the click of a button in my android app. So say, I have a button called "Google", when the user clicks on that button I want google.com to open up on the screen. How is this achieved? Also, is there a way I can gain control back to my app once the user is finished with google? Thanks George

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  • delete last row in a table android

    - by Sephy
    Hi everybody, My question is quite straightforward. I have a table, with, lets say x rows, with each an id, but i don't know how many rows i have. Now i want to delete the last row of my table for some reason... Is there an easy way to do that in android? I have been trying to use the last_insert_rowid in my where clause...but no luck so far... any idea? thx for help

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  • android listview

    - by gayathri
    hai i want to remove the listitem from listview in android.i don't know that how to do it. anyone can help me how to do it.and give sample code for this?

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  • How do I lock the layout of my android program to one orientation

    - by Mike V
    I'm trying to write a program that needs smooth orientation sensor samples as the phone is rotated all around. Every time the orientation of the phone is changed, it interrupts the data and freezes the program while the layout changes. How can I lock it in one orientation (landscape or portrait, it doesn't matter)? I assume it has something to do with android:layout in the xml file, but I can't find anything online.

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  • Android USB Host Communication

    - by Kip Russell
    I'm working on a project that utilizes the USB Host capabilities in Android 3.2. I'm suffering from a deplorable lack of knowledge and talent regarding USB/Serial communication in general. I'm also unable to find any good example code for what I need to do. I need to read from a USB Communication Device. Ex: When I connect via Putty (on my PC) I enter: >GO And the device starts spewing out data for me. Pitch/Roll/Temp/Checksum. Ex: $R1.217P-0.986T26.3*60 $R1.217P-0.986T26.3*60 $R1.217P-0.987T26.3*61 $R1.217P-0.986T26.3*60 $R1.217P-0.985T26.3*63 I can send the initial 'GO' command from the Android device at which time I receive an echo of 'GO'. Then nothing else on any subsequent reads. How can I: 1) Send the 'go' command. 2) Read in the stream of data that results. The USB device I'm working with has the following interfaces (endpoints). Device Class: Communication Device (0x2) Interfaces: Interface #0 Class: Communication Device (0x2) Endpoint #0 Direction: Inbound (0x80) Type: Intrrupt (0x3) Poll Interval: 255 Max Packet Size: 32 Attributes: 000000011 Interface #1 Class: Communication Device Class (CDC) (0xa) Endpoint #0 Address: 129 Number: 1 Direction: Inbound (0x80) Type: Bulk (0x2) Poll Interval (0) Max Packet Size: 32 Attributes: 000000010 Endpoint #1 Address: 2 Number: 2 Direction: Outbound (0x0) Type: Bulk (0x2) Poll Interval (0) Max Packet Size: 32 Attributes: 000000010 I'm able to deal with permission, connect to the device, find the correct interface and assign the endpoints. I'm just having trouble figuring out which technique to use to send the initial command read the ensuing data. I'm tried different combinations of bulkTransfer and controlTransfer with no luck. Thanks. I'm using interface#1 as seen below: public AcmDevice(UsbDeviceConnection usbDeviceConnection, UsbInterface usbInterface) { Preconditions.checkState(usbDeviceConnection.claimInterface(usbInterface, true)); this.usbDeviceConnection = usbDeviceConnection; UsbEndpoint epOut = null; UsbEndpoint epIn = null; // look for our bulk endpoints for (int i = 0; i < usbInterface.getEndpointCount(); i++) { UsbEndpoint ep = usbInterface.getEndpoint(i); Log.d(TAG, "EP " + i + ": " + ep.getType()); if (ep.getType() == UsbConstants.USB_ENDPOINT_XFER_BULK) { if (ep.getDirection() == UsbConstants.USB_DIR_OUT) { epOut = ep; } else if (ep.getDirection() == UsbConstants.USB_DIR_IN) { epIn = ep; } } } if (epOut == null || epIn == null) { throw new IllegalArgumentException("Not all endpoints found."); } AcmReader acmReader = new AcmReader(usbDeviceConnection, epIn); AcmWriter acmWriter = new AcmWriter(usbDeviceConnection, epOut); reader = new BufferedReader(acmReader); writer = new BufferedWriter(acmWriter); }

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  • Android: how to share code between projects signed with the same certificate

    - by tomash
    In Android documentation concerning code signing we can read: "By signing multiple applications with the same certificate and using signature-based permissions checks, your applications can share code and data in a secure manner." How exactly such code sharing can be done? Is it possible to release main application and multiple exchangeable plugins then discover them at runtime? What does source code looks like and what are advantages over "standard" intents calls from/to different APK packages?

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  • Storage of events in Calendar application in Android 2.1

    - by Navin
    Does the calendar application in Android maintain a cache of its database? Whenever I edit and mark some events via the calendar app, it is stored in the database but if I edit the calendar.db from some outside source the changes made are not reflected in the calendar app. So my question is: Does the calendar app maintain a cache or some other form of database? If yes then where and how?

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  • black screen while retrieving result from webservices in android

    - by Aswan
    Hi Folks i am using following webservices for retrieving data from server server side:.net client side:ksoap2 whenever activity start, onCreate i am using spinner for displying data returned by the webservices when this activity start it showing black screen after lunching the activity .i found black screen is coming when activity connecting to webservices How to resolve this MyCode public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); try { //Display the online and busy people display in spinner //people are display in relative people only(Mygroup) /* get the online and busy people who are in user group from DB*/ users_names_ids=new ParseXMLString().convertusernames(new DataParsingComm().ILGetOnlinePeoples("<spGetOnlinePeoples><UserID>"+GetCurrentUserID.id+"</UserID></spGetOnlinePeoples>")); /* create an array with the size of number of peoples whose status is online or busy */ String[] array =new String[users_names_ids.size()]; int setselction=0;// initialize the selection to 0. /* if array length is greater than zero, that means getting at least one person whose status is online or busy */ if(array.length>0){ /* Returns an enumeration on the keys of this Hashtable instance. And assigns into Enumeration instance variable */ Enumeration e= users_names_ids.keys(); /* Iterate list Enumeration until it does't has any more elements */ for(int i=0;e.hasMoreElements();i++) try{ /* get all persons names into the array list */ array[i]=e.nextElement().toString(); /* Get the ChatUserName value from the ChatInPeopleDetails preferences. And If it is in this list set selection to the index 'i' */ if(getSharedPreferences("ChatInPeopleDetails", 0).getString("ChatUserName", "").equals(array[i])) setselction=i; /* * Get the String value of Relname, that previously added with putExtra() as extended data to the parent intent * If that value is not null and exists in the array list then * set the selection to the index 'i'. * */ else if(getIntent().getStringExtra("Relname")!=null && getIntent().getStringExtra("Relname").equals(array[i])) setselction=i; }catch(Exception ex){ ex.printStackTrace(); } finally { System.gc(); System.runFinalization(); } } /* create a new array adapter with the ChatForm context and array objects */ ArrayAdapter<String> adapter2 = new ArrayAdapter<String>(ChatForm.this,android.R.layout.simple_spinner_item, array); /* Set the layout resource to create the drop down views. */ adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); /* The Adapter is used to provide the data which backs this Spinner SpinnerUsersToChat. */ ((Spinner)findViewById(R.id.SpinnerUsersToChat)).setAdapter(adapter2); /* Get the ChatUserName value from the ChatInPeopleDetails preferences. If this value is not null*/ if(getSharedPreferences("ChatInPeopleDetails", 0).getString("ChatUserName", "") !=null) { /* Set the currently selected item of spinner based on selection variable value */ ((Spinner)findViewById(R.id.SpinnerUsersToChat)).setSelection(setselction); } /* Register a callback to be invoked when an item in this AdapterView has been selected.*/ ((Spinner)findViewById(R.id.SpinnerUsersToChat)).setOnItemSelectedListener(new OnItemSelectedListener() { public void onItemSelected(AdapterView<?> parent,View v,int position,long id) { /* call getMsg() to get messages and display them*/ getMsg(); /* Causes the Runnable to be added to the message queue. The runnable will be run on the user interface thread.*/ ((ScrollView)findViewById(R.id.ScrollView06)).post(new Runnable() { public void run() { /* This fullScroll() method will scroll the view to the bottom .*/ ((ScrollView)findViewById(R.id.ScrollView06)).fullScroll(View.FOCUS_DOWN); } }); } /* on nothing selected to do somthing . this an overridden method */ public void onNothingSelected(AdapterView<?> arg0) { } }); } catch (Exception e1) { e1.printStackTrace(); } }

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  • Using GData and the Google Analytics on Android

    - by Luke Lowrey
    I am wondering what my options are for using GData and specifically the analytics api on android to build a small widget. After searching around for a while I couldnt come up with any libraries with decent examples. Are there any dedicated libraries with some decent examples / doco to do this sort of thing? I would like to target 1.6 but if the are 2.0 only I guess that is fine too.

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  • Does Android platform support SpatiaLite?

    - by Stan
    Is it possible to use SpatiaLite database on Android platform (1.6)? I am trying to program a google buzz-like app which need to take advantage of SpatiaLite functions, like calculating distance between 2 points, etc. Any external library needed? Thanks.

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  • Android beginner

    - by Karthick
    Hi I am new android. I need to know how to install it in windows xp and which one is the best IDE and what are the requirements are needed. And I need to know how to develop an application in that platform.

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