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2014/10/16 ¤W¤È 08:18:03
android Programming Glossary: lookAndroid update 17 seems incompatible with external Jars http://stackoverflow.com/questions/10046298/android-update-17-seems-incompatible-with-external-jars fine but then crash at run time with exceptions that look like this E dalvikvm 2414 Could not find class 'javax.mail.internet.InternetAddress'..
Application Skeleton to support multiple screen http://stackoverflow.com/questions/12242111/application-skeleton-to-support-multiple-screen app is image intensive A higher quality lossy JPEG may look better than a highly compressed lossless PNG for the same file..
How do I get the current GPS location programmatically in Android? http://stackoverflow.com/questions/1513485/how-do-i-get-the-current-gps-location-programmatically-in-android You can download the source code for one of my books look for the Internet Weather and Service WeatherPlus demos each.. . Or you can download the source for another of my books look for the 23 Location tutorial for some examples of using LocationManager..
Quitting an application - is that frowned upon? http://stackoverflow.com/questions/2033914/quitting-an-application-is-that-frowned-upon in a very narrow business field. I was actually really looking forward to developing for the Android platform since it addresses.. I hope I don't have to abandon Android but it doesn't look very good right now Is there a way for me to really quit the..
How do I pass data between activities in Android? http://stackoverflow.com/questions/2091465/how-do-i-pass-data-between-activities-in-android
How to discover memory usage of my application in Android http://stackoverflow.com/questions/2298208/how-to-discover-memory-usage-of-my-application-in-android numbers you get is extremely low. Pretty much every time I look at memory usage numbers with other engineers there is always.. ActivityManager.getMemoryInfo is our highest level API for looking at overall memory usage. This is mostly there to help an.. and is not shared with any other processes. Another way to look at this is the RAM that will become available to the system..
What are the best practices for SQLite on Android? http://stackoverflow.com/questions/2493331/what-are-the-best-practices-for-sqlite-on-android in the blog post. That should be out very soon. Take a look. In the meantime there is a follow up blog post Single SQLite..
Declaring a custom android UI element using XML http://stackoverflow.com/questions/2695646/declaring-a-custom-android-ui-element-using-xml Android LabelView Sample If you want a complete example look at the android label view sample. LabelView.java TypedArray..
Trying to start a service on boot on Android http://stackoverflow.com/questions/2784441/trying-to-start-a-service-on-boot-on-android boots up on android but I cannot get it to work. I've looked a number of links online but none of the code is working... share improve this question The other answers look good but I thought I'd wrap everything up into one complete..
Download a file with Android, and showing the progress in a ProgressDialog http://stackoverflow.com/questions/3028306/download-a-file-with-android-and-showing-the-progress-in-a-progressdialog dialog downloadTask.cancel true The AsyncTask will look like this usually subclasses of AsyncTask are declared inside.. to run CPU blocking operations . Download service can look like this public class DownloadService extends IntentService.. android name .DownloadService And the activity will look like this initialize the progress dialog like in the first example..
Make a link in the Android browser start up my app? http://stackoverflow.com/questions/3469908/make-a-link-in-the-android-browser-start-up-my-app the problems I had. For instance my AndroidManifest.xml looks like this activity android name .AntonWorld android label @string.. share improve this question I think you'll want to look at the intent filter element of your Mainfest file. Specifically.. filter element of your Mainfest file. Specifically take a look at the documentation for the data sub element. Basically what..
How do you to retrieve dimensions of a view? Getheight() and Getwidth() always return zero http://stackoverflow.com/questions/4142090/how-do-you-to-retrieve-dimensions-of-a-view-getheight-and-getwidth-always-r a view made up of tablelayout tablrows and textviews to look like a grid. I need to get the height and width of this grid...
How to parse XML using the SAX parser http://stackoverflow.com/questions/4827344/how-to-parse-xml-using-the-sax-parser public String getTitle return title rest of the class looks similar so just setters and getters This class implements the.. handler implementation using the Channel object above looks like this. Example public class ExampleHandler extends DefaultHandler.. disadvantage which should be pretty obvious by now. Take a look at the else if statement in the startElement method. Due to..
How can i call Wi-Fi settings screen from my application using Android http://stackoverflow.com/questions/2318310/how-can-i-call-wi-fi-settings-screen-from-my-application-using-android on this. android wifi share improve this question Look at android.provider.Settings for a series of Intent actions..
overriding the Home Key Long press in a category.HOME activity http://stackoverflow.com/questions/2934355/overriding-the-home-key-long-press-in-a-category-home-activity is as follows Make your app act as a home replacement app Look at the sample home app in the SDK samples Allow a way in your..
Android/Java — Post simple text to Facebook wall? http://stackoverflow.com/questions/2953146/android-java-post-simple-text-to-facebook-wall to do this. Add the .jar file to your project's build path Look at the following simplified example code import android.app.Activity..
Launch custom android application from android browser http://stackoverflow.com/questions/2958701/launch-custom-android-application-from-android-browser to get the number of path segments in the Uri . Look to javadoc or the android developer website for other Uri methods..
How to enable LogCat/Console in Eclipse for Android? http://stackoverflow.com/questions/3280051/how-to-enable-logcat-console-in-eclipse-for-android So you have to handle every thing in Logcat. More Info Look out this Documentation . Edit 1 System.out.println is working..
http://stackoverflow.com/questions/3280141/android-calledfromwrongthreadexception-only-the-original-thread-that-created handler android asynctask share improve this question Look like you are on the wrong thread. Try using a Handler to update..
How to encode a WAV to a mp3 on a Android device http://stackoverflow.com/questions/3641920/how-to-encode-a-wav-to-a-mp3-on-a-android-device encoding mp3 wav share improve this question Pure Java Look into Tritonus's clean room implementation of javasound which..
Example: Communication between Activity and Service using Messaging http://stackoverflow.com/questions/4300291/example-communication-between-activity-and-service-using-messaging activity android service share improve this question Look at the LocalService example . Your Service returns an instance..
How to get the first name and last name from Android contacts? http://stackoverflow.com/questions/4301064/how-to-get-the-first-name-and-last-name-from-android-contacts android android contacts share improve this question Look at section 7.3 here for some example code. Also have a look..
http://stackoverflow.com/questions/4468248/unique-id-of-android-device ID in that case android share improve this question Look at the constant ANDROID_ID in android.provider.Secure.Settings..
Android Listview with different layout for each row http://stackoverflow.com/questions/4777272/android-listview-with-different-layout-for-each-row if it's null and determine type using getItemViewType . Look at this tutorial for further information. To achieve some optimizations..
How to use addr2line in Android http://stackoverflow.com/questions/5314036/how-to-use-addr2line-in-android I DEBUG 31 #02 pc 00017d34 system lib libdvm.so Look at the last 3 lines this is your callstack. 'pc' is the program..
Android crash when app is closed and reopened http://stackoverflow.com/questions/5318847/android-crash-when-app-is-closed-and-reopened crash because you can't call Thread.start twice. Look at my link above for a more in depth description of the problem..
Android: column '_id' does not exist problem http://stackoverflow.com/questions/5825020/android-column-id-does-not-exist-problem can be handled correctly by adapters and adapterviews etc. Look at the data model in the docs for Content Providers . Using..
How to open a pdf stored either in res/raw or assets folder? http://stackoverflow.com/questions/6491210/how-to-open-a-pdf-stored-either-in-res-raw-or-assets-folder When the user wants to view it copy it somewhere public . Look into openFileOutput or getExternalFilesDir . Launch the Intent..
Calculating distance between two geographic locations http://stackoverflow.com/questions/8049612/calculating-distance-between-two-geographic-locations reference android location Location.html Look into distanceTo or distanceBetween. You can create a Location..
check android application is in foreground or not? http://stackoverflow.com/questions/8489993/check-android-application-is-in-foreground-or-not context .get Also let me know if I misunderstand.. UPDATE Look at this SO question Determining the current foreground application..
R cannot be resolved - Android error http://stackoverflow.com/questions/885009/r-cannot-be-resolved-android-error manage imports. This will cause your make to break. Look out for these erroneous import statements and delete them. While..
Android update 17 seems incompatible with external Jars http://stackoverflow.com/questions/10046298/android-update-17-seems-incompatible-with-external-jars class not found exceptions at RUN TIME Meaning they compile fine but then crash at run time with exceptions that look like this E dalvikvm 2414 Could not find class 'javax.mail.internet.InternetAddress' referenced from method com.my.project.Main.isValidEmailAddress..
Application Skeleton to support multiple screen http://stackoverflow.com/questions/12242111/application-skeleton-to-support-multiple-screen 50 file size reductions over PNG which is significant if your app is image intensive A higher quality lossy JPEG may look better than a highly compressed lossless PNG for the same file size Add labels to your images and graphics for debugging..
How do I get the current GPS location programmatically in Android? http://stackoverflow.com/questions/1513485/how-do-i-get-the-current-gps-location-programmatically-in-android any examples of the location API which is somewhat surprising. You can download the source code for one of my books look for the Internet Weather and Service WeatherPlus demos each of which uses LocationManager . Or you can download the source.. Service WeatherPlus demos each of which uses LocationManager . Or you can download the source for another of my books look for the 23 Location tutorial for some examples of using LocationManager . Most of the other online tutorials are out of..
Quitting an application - is that frowned upon? http://stackoverflow.com/questions/2033914/quitting-an-application-is-that-frowned-upon general public it is a business app that is going to be used in a very narrow business field. I was actually really looking forward to developing for the Android platform since it addresses a lot of issues that exist in Windows Mobile and .NET... However the last week has been somewhat of a turnoff for me... I hope I don't have to abandon Android but it doesn't look very good right now Is there a way for me to really quit the application android share improve this question This will..
How do I pass data between activities in Android? http://stackoverflow.com/questions/2091465/how-do-i-pass-data-between-activities-in-android
How to discover memory usage of my application in Android http://stackoverflow.com/questions/2298208/how-to-discover-memory-usage-of-my-application-in-android the chances of you actually correctly interpreting whatever numbers you get is extremely low. Pretty much every time I look at memory usage numbers with other engineers there is always a long discussion about what they actually mean that only results.. 2010 02 service api changes starting with.html Now ActivityManager.getMemoryInfo is our highest level API for looking at overall memory usage. This is mostly there to help an application gauge how close the system is coming to having no.. be paged to disk it is not backed by the same data on disk and is not shared with any other processes. Another way to look at this is the RAM that will become available to the system when that process goes away and probably quickly subsumed into..
What are the best practices for SQLite on Android? http://stackoverflow.com/questions/2493331/what-are-the-best-practices-for-sqlite-on-android and follows the safe creation calling structure I describe in the blog post. That should be out very soon. Take a look. In the meantime there is a follow up blog post Single SQLite connection Also checkout the fork by 2point0 of the previously..
Declaring a custom android UI element using XML http://stackoverflow.com/questions/2695646/declaring-a-custom-android-ui-element-using-xml Reference the custom view using the fully qualified name. Android LabelView Sample If you want a complete example look at the android label view sample. LabelView.java TypedArray a context.obtainStyledAttributes attrs R.styleable.LabelView..
Trying to start a service on boot on Android http://stackoverflow.com/questions/2784441/trying-to-start-a-service-on-boot-on-android on Android I've been trying to start a service when a device boots up on android but I cannot get it to work. I've looked a number of links online but none of the code is working. Am I forgetting something AndroidManifest.xml receiver android.. Service loaded at start Thanks android service broadcastreceiver share improve this question The other answers look good but I thought I'd wrap everything up into one complete answer. You need the following in your AndroidManifest.xml file..
Download a file with Android, and showing the progress in a ProgressDialog http://stackoverflow.com/questions/3028306/download-a-file-with-android-and-showing-the-progress-in-a-progressdialog @Override public void onCancel DialogInterface dialog downloadTask.cancel true The AsyncTask will look like this usually subclasses of AsyncTask are declared inside the activity class. that way you can easily modify the UI.. app when you extends Service you must manually spawn new threads to run CPU blocking operations . Download service can look like this public class DownloadService extends IntentService public static final int UPDATE_PROGRESS 8344 public DownloadService.. resultData Add the service to your manifest service android name .DownloadService And the activity will look like this initialize the progress dialog like in the first example this is how you fire the downloader mProgressDialog.show..
Make a link in the Android browser start up my app? http://stackoverflow.com/questions/3469908/make-a-link-in-the-android-browser-start-up-my-app intent filter with the new subelements in that tag to avoid the problems I had. For instance my AndroidManifest.xml looks like this activity android name .AntonWorld android label @string app_name intent filter action android name android.intent.action.MAIN.. android.intent.category.DEFAULT intent filter activity android share improve this question I think you'll want to look at the intent filter element of your Mainfest file. Specifically take a look at the documentation for the data sub element... this question I think you'll want to look at the intent filter element of your Mainfest file. Specifically take a look at the documentation for the data sub element. Basically what you'll need to do is define your own scheme. Something along..
How do you to retrieve dimensions of a view? Getheight() and Getwidth() always return zero http://stackoverflow.com/questions/4142090/how-do-you-to-retrieve-dimensions-of-a-view-getheight-and-getwidth-always-r of a view Getheight and Getwidth always return zero I have a view made up of tablelayout tablrows and textviews to look like a grid. I need to get the height and width of this grid. The methods getheight and getwidth always return 0. This happens..
How to parse XML using the SAX parser http://stackoverflow.com/questions/4827344/how-to-parse-xml-using-the-sax-parser return items public void setTitle String title this.title title public String getTitle return title rest of the class looks similar so just setters and getters This class implements the Serializable interface so you can put it into a Bundle and.. End Characters between Element Start and Element End An example handler implementation using the Channel object above looks like this. Example public class ExampleHandler extends DefaultHandler private Channel channel private Items items private.. over the android.sax one. I can however tell you the disadvantage which should be pretty obvious by now. Take a look at the else if statement in the startElement method. Due to the fact that we have the tags title link and description we..
How can i call Wi-Fi settings screen from my application using Android http://stackoverflow.com/questions/2318310/how-can-i-call-wi-fi-settings-screen-from-my-application-using-android from an android program Please give me advise or sample code on this. android wifi share improve this question Look at android.provider.Settings for a series of Intent actions you can use to launch various settings screens e.g. ACTION_WIFI_SETTINGS..
overriding the Home Key Long press in a category.HOME activity http://stackoverflow.com/questions/2934355/overriding-the-home-key-long-press-in-a-category-home-activity a double press of the home button. The general idea for this is as follows Make your app act as a home replacement app Look at the sample home app in the SDK samples Allow a way in your app to specify a home app to use it is pretty straightforward..
Android/Java — Post simple text to Facebook wall? http://stackoverflow.com/questions/2953146/android-java-post-simple-text-to-facebook-wall this import com.android.myapp.R . Go to #5 if you needed to do this. Add the .jar file to your project's build path Look at the following simplified example code import android.app.Activity import android.os.Bundle import android.view.View import..
Launch custom android application from android browser http://stackoverflow.com/questions/2958701/launch-custom-android-application-from-android-browser going to want to do it in onCreate . You can also use params.size to get the number of path segments in the Uri . Look to javadoc or the android developer website for other Uri methods you can use to extract specific parts. share improve..
How to enable LogCat/Console in Eclipse for Android? http://stackoverflow.com/questions/3280051/how-to-enable-logcat-console-in-eclipse-for-android Emulator or Device. System.out println not works in Android. So you have to handle every thing in Logcat. More Info Look out this Documentation . Edit 1 System.out.println is working on Logcat.If you use that the Tag will be like System.out..
http://stackoverflow.com/questions/3280141/android-calledfromwrongthreadexception-only-the-original-thread-that-created public void onClick View v Void the Button android handler android asynctask share improve this question Look like you are on the wrong thread. Try using a Handler to update the GUI on the right thread. See this example from android.com...
How to encode a WAV to a mp3 on a Android device http://stackoverflow.com/questions/3641920/how-to-encode-a-wav-to-a-mp3-on-a-android-device audio as a WAV file which I can easily do. java android encoding mp3 wav share improve this question Pure Java Look into Tritonus's clean room implementation of javasound which offers an MP3 encoder plugin here http www.tritonus.org plugins.html..
Example: Communication between Activity and Service using Messaging http://stackoverflow.com/questions/4300291/example-communication-between-activity-and-service-using-messaging MyService Service Stopped. isRunning false android android activity android service share improve this question Look at the LocalService example . Your Service returns an instance of itself to consumers who call onBind . Then you can directly..
How to get the first name and last name from Android contacts? http://stackoverflow.com/questions/4301064/how-to-get-the-first-name-and-last-name-from-android-contacts
http://stackoverflow.com/questions/4468248/unique-id-of-android-device
Android Listview with different layout for each row http://stackoverflow.com/questions/4777272/android-listview-with-different-layout-for-each-row you should use based on position Then you inflate layout only if it's null and determine type using getItemViewType . Look at this tutorial for further information. To achieve some optimizations in structure that you've described in comment I..
How to use addr2line in Android http://stackoverflow.com/questions/5314036/how-to-use-addr2line-in-android #01 pc 00039b76 data data com.example.gltest lib libnativemaprender.so I DEBUG 31 #02 pc 00017d34 system lib libdvm.so Look at the last 3 lines this is your callstack. 'pc' is the program counter and the pc for stack frame #00 gives you the address..
Android crash when app is closed and reopened http://stackoverflow.com/questions/5318847/android-crash-when-app-is-closed-and-reopened it every time the surface is created which will make your application crash because you can't call Thread.start twice. Look at my link above for a more in depth description of the problem and how you should solve it. Since my explanation wasn't..
Android: column '_id' does not exist problem http://stackoverflow.com/questions/5825020/android-column-id-does-not-exist-problem as a unique key to make sure the data the cursor handles can be handled correctly by adapters and adapterviews etc. Look at the data model in the docs for Content Providers . Using a unique key in 'databases' of whatever kind is pretty much..
How to open a pdf stored either in res/raw or assets folder? http://stackoverflow.com/questions/6491210/how-to-open-a-pdf-stored-either-in-res-raw-or-assets-folder the following Store the PDF file in the assets directory. When the user wants to view it copy it somewhere public . Look into openFileOutput or getExternalFilesDir . Launch the Intent just like you are doing now except use getAbsolutePath on..
Calculating distance between two geographic locations http://stackoverflow.com/questions/8049612/calculating-distance-between-two-geographic-locations latitude longitude share improve this question http developer.android.com reference android location Location.html Look into distanceTo or distanceBetween. You can create a Location object from a latitude and longitude Location locationA new..
check android application is in foreground or not? http://stackoverflow.com/questions/8489993/check-android-application-is-in-foreground-or-not like this boolean foregroud new ForegroundCheckTask .execute context .get Also let me know if I misunderstand.. UPDATE Look at this SO question Determining the current foreground application from a background task or service fore more information....
R cannot be resolved - Android error http://stackoverflow.com/questions/885009/r-cannot-be-resolved-android-error use resources especially when you ask Eclipse to sort or otherwise manage imports. This will cause your make to break. Look out for these erroneous import statements and delete them. While going through the Android sample tutorials I would often..
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