Android :: Backward Compatibility Tutorial - Application Not Working
Jun 29, 2010
I'm having trouble getting my app to work properly on older devices. I've ready the "Backward Compatibility" tutorial, I'm working for performance - and it suggestions using .invoke is considerably slower than using a wrapper class. But it seems the wrapper class only works for if a class is not available on older devices. I'm compiling with 2.2, but minSDK is 1.5. I'm working with multitouch, I assumed that if I checked against Build.Version.SDK, and didn't call getPointerCount() - then it wouldn't raise an error. But when I create an instance of the class which has my methods in, I get this: 06-29 08:17:28.263: ERROR/dalvikvm(255): Could not find method android.view.MotionEvent.getPointerCount, referenced from method com.myPackage.myClass. Despite not actually calling it. Is this normal?
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Sep 4, 2010
I recently enabled the app2sd functionality in my app.When i test the apk on my NexusOne (2.2) the app goes to the SD card, perfect! But when i publish the app on the market and install the same apk from the market on the same Nexus, the app2sd function is missing, I can't install it to my SD card.
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Aug 2, 2009
If I build against the 1.5_r3 SDK are there any compatibility issues with running it on devices that are at previous levels of 1.5? I would certainly hope not, but I've learned not to make such assumptions.
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Apr 14, 2009
I want to avoid the SDK 1.0 and 1.1 workaround for playing synthesized audio as of SDK1.5, but for older phones or firmware (SDK 1.0 and 1.1 based) I want to maintain backward compatibility and first write audio to flash memory in order to play the resulting audio file from there.
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May 6, 2010
I am trying to cache my viewgroup to a bitmap and blit this to screen instead of calling dispatchDraw on the group while scrolling for performance reasons. This works quite well on 1.5, but has ugly scaling artefacts on 1.6 and newer for high density screens. Because of my 1.5 compatibility I can't find a way to set the density of my cached bitmap.
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Jan 29, 2010
I would like to know whether the Android provides any sort of compatibility i.e either forward or backward. It means as in Blackberry if develop an Application with JDE 4.2 then that application will work on any handset with OS 4.2 or higher which means it has forward compatibility. Is there anything similar in Android? Suppose I develop application with Android SDK 1.5 then will that application work on any handset having OS 1.5 or higher.
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Nov 13, 2010
I'm on Mac OS X Leopard and installed the ADT plugin into Eclipse Galileo. I followed all these steps to get started:
http://developer.android.com/sdk/index.html
My SDK version is 2.2 API 8 revision 2 and I just used the Hello World tutorial found here:
[url]
When I first created the Android application, I saw this error in the Eclipse console:
[2010-11-13 18:20:43 - HelloAndroid] ERROR: Unable to open class file / Users/mydirectory/Documents/workspace/HelloAndroid/gen/com/example/ helloandroid/R.java: No such file or directory
I commented out this line to fill in the few lines from the tutorial:
setContentView(R.layout.main);
When I ran the app, it launched my emulator but all I saw was a vertical screen on the left that said "ANDROID" and phone buttons on the right. I did not see the "Hello, Android" text from the tutorial.
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Sep 21, 2010
I have followed the tutorial and can't seem to get it to work.
Here's my code:
CODE:...........
All I get are error message everywhere. What did I do wrong?
I followed everything the tutorial said to do.
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Apr 5, 2010
I would like to make an navigation application, but I don't want to use an openSource, because I want my to be payable. I have some question, what would be great if you can give me some answers or tips where can I check them :
- If I set my Target marker on the map How can the application know what is the way ? Why not set the route across buildings, park,etc... how are the other navigation application knows where are the streets, corners ? So How can link the graph nodes to corners and How can the graph ways to be streets ?
- I would like to use OpenStreetMaps or Google Maps for the mapping. Are these know the Traffic rules ? For example One Way streets ?
I'm looking for a tutorial witch may teach about navigation?
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Aug 29, 2010
'I tried to open the tutorial programed to the phone and i can't get past the "begin" button. It says to click and nothing happens, i don't get to another screen by now i don't really need the tutorial but i am still bothered that it doesn't even work .
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Oct 12, 2009
What is the recommended approach to have currently shipping 1.5-SDK compliant apps to start offering 1.6 features (such as TTL) in the Market? Can we just publish 2 versions of the same package name each compiled with a different SDK level (will the Market automatically push out only the right version of the app) or do we have to use different package name and assume that the user will find a way to understand the version of the OS he has. A public statement to the developper community would be more than welcomed here!
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Jan 26, 2010
I can run my application on 1.5, 1.6 and 2.0 emulator and on a 1.5 device without any problems. But some of my users are reporting force close and strange menu entries (see the attachment) using 1.6 and higher version devices.
This screen should look like this:
http://www.taypo.com/blog/WindowsLiveWriter/TurkceKlavye0.7_6F1/settings_0.7_2.png
And the code that generates this screen is:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory android:title="@string/general_settings">
<CheckBoxPreference android:title="@string/haptic_feedback" android:defaultValue="true"android:summary="@string/haptic_feedback_summary" android:key="vibrate"/>
<CheckBoxPreference android:title="@string/sound_feedback" android:defaultValue="false" android:summary="@string/sound_feedback_summary" android:key="sound" />
<CheckBoxPreference android:title="@string/auto_caps" android:defaultValue="true"
android:summary="@string/auto_caps_summary" android:key="auto_caps" />
</PreferenceCategory>
<PreferenceCategory android:title="@string/layout_settings">
<ListPreference android:title="@string/keyboard_layout" android:defaultValue="TRQ" android:key="kbd_layout" android:entries="@array/layout_names" android:entryValues="@array/layout_values" />
</PreferenceCategory>
</PreferenceScreen>
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Feb 16, 2010
Got some errors following the tutorial for MapView when i was going to integrate overlays.
CODE:..............
I am trying to learn and i got an awesome app idea which needs mapview, webview, overlays and tabs.
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Jan 13, 2010
After many attempts to try and use the terminal emulator that is already preloaded onto the behold 2 , and many failures..After trying out different Terminal Em.'s and always having my phone lag because they wernt made for it...i have finally found a way to get terminal emulator working with no lag or no slow down in performance... First you must have root,of course, Next, Use an app called root explorer or something similar and goto the folder /system/app/ and find the two files Term.apk and Term.odex, and MOVE them to your sd card from your phone,you want them gone from your system/app folder After that simply goto the market and search for Terminal Emulator , re-download and there you have it, Working term. em. on the behold 2.Peace Ladz.
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Apr 26, 2010
I don't know why, but in Eclair, the default (non-fancy) gallery app changed its behavior from the Cupcake version, and it broke one of my commercial applications Firstly, when long-pressing a gallery and choosing "Diashow", it does not publish an Intent to be picked up by any application that implements the Intent filter anymore. Instead, it will directly call "com.android.gallery/com.android.camera.ViewImage" with extras. Question: is it still possible to intercept this intent and allow the user to choose my application to do the Diashow? Secondly, the intent extras for the VIEW intent are messed up (in my build of 2.1 anyway): Instead of providing the BucketId of the picture in the Intent's query parameter. But in 2.1, the BucketId is moved to the Intent's extras. Except; it is not passing the BUCKET_ID, but the unlocalized BUCKET_DISPLAY_NAME instead Question: how can I still get the unique BUCKET_ID from the intent, so that I do not have to work with a potentially non-unique BUCKET_DISPLAY_NAME.
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Apr 21, 2010
I'm using a WebViewClient that overrides shouldOverrideUrlLoading so the browsing stays inside the WebView. I initially call loadDataWithBaseURL with some HTML I have in memory, which has links in it. When I click the links, they load correctly in the webView. Everything is good up till now, but when I press back, effectively calling webView.goBack(), the webView loads the failUrl I passed to loadDataWithBaseURL. Why does it work going forward, but not going backward?
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Aug 19, 2012
I'm flabagasted that it has less features than 2.3.3!
For instance independent ring tone and notification volumes in 2.3.3 but not in 4.0.3
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Aug 3, 2010
There are a few threads of various Vibrant/TouchWiz Calendar issues (Samsung Galaxy S). I am starting this thread to hopefully get a reply of all the various issues in one spot and maybe someone can get this list somewhere that will drive change. In my mind, a smart-phone's roots is a PDA + Phone. Yes, it is amazing that they can do much, much more now, which makes these phones that much better, but to me, the Calendar is part of their roots. These disappointments that I'm starting with were available in Android 1.5 which makes them all the more frustrating. I am bulleting these instead of numbering them because I'd rank them all at the top. Really, any issue that you are having out there, especially one that is a non-issue in stock Android, is pure neglect by Samsung.
- No ability to customize notifications in the TouchWiz Calendar. Anyone need a reminder ringtone that is different than your other notifications? You won't get one that stands out from the others in your Samsung Vibrant because you have no ability to change it.
-No ability to hyperlink in the TouchWiz Calendar. Let's say I am going to a wedding that is out of town. On my G1 I could enter phone numbers and address to the Hotel, Reception Hall, key contacts, and the like; so all I had to do was go to my trusty calendar and click on a hyperlink to get directions in my map or call people/places via the dialer, oh, and I'd know what time things started because it is a super useful feature in a calendar. Good luck doing this conveniently on the Vibrant's TouchWiz Calendar because it does not have this feature. Maybe the biggest disappointment.
-Repeating Events in the TouchWiz Calendar provokes issues when modifying . If I edit only a single event in a series of repeating events via my web-browser on my laptop, TouchWiz will duplicate the event, keeping the original event, but also creating the changed single event as a new separate event entirely.
I'm sure this is the tip of the iceberg because I've seen a number of posts. . . although I haven't seen any mention of the hyperlinking which I find an enormous help.opefully someone from T-Mobile or Samsung will review and implement asap. In the end, I may return my phone if I have no confidence in these being fixedI'd also love to hear solutions. I've tried all the market calendar apps I could. Gemini, Junte, they provide hyperlinking, but don't fix the duplicatation issue. All other calendar apps ultimately just click through to the native Touchwiz calendar.Given the specs on the current phones out there, these features should be included off the shelf. I've rooted my G1, but one shouldn't have to root to have basic features available to Android such as the above.
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Mar 13, 2009
How to make camera work for the android file system. When am I clicking camera application button, only square blocks are coming in the LCD screen.
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Dec 8, 2009
I really wanted GDE to work but today it made my phone all but useless. It locked up my phone for 5 minutes, so i pulled the battery to reset and for the next 45 minutes the phone app would not work at all, it would open but would not dial any #, and the rest of GDE was so slow i couldnt do anything. I couldnt turn wifi on or off, gps on or off, close open programs or open new ones. I finally had to uninstall it cause it was just too much for the phone. Its a shame cause i liked it, i installed home ++ today and seems to be doing ok.
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Oct 21, 2010
Is there an app on the market that would allow me to receive and send texts through Google Voice? The layout of Google Voice's app gets annoying when I want to just compose a message to someone but I first have to back out to the inbox.
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Mar 22, 2012
I launched android application in market and it is working fine in mobile device 2.2 and less,but not working in tablet version 3.2.Do i need to change in android manifest file ?
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Apr 10, 2009
why a picture taking application works on some phones and not on others? The app was tested with the 1.1 emulator and the 1.0 developer phone. Some customers reported that they could not find the resulting pictures using the Picture application after they powered off the phone and powered it back on to cause a new media scan. Others find them just fine (in the dcim/camera directory). Are there any known conflicts for applications taking pictures? The only other thing I can think of is that the developer phone, currently at 1.0, will function differently at 1.1, however, the app works on the 1.1 version of the emulator.
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Oct 5, 2010
I currently found out, that my Application developed for Android 1.6 does not work on Android 2.2. I'm quite puzzled about this, because its a very simple Application which almost does nothing. The Expeption I get is like that:
java.lang.RuntimeException: Unable to instantiate application [packagename].AndApp:
java.lang.ClassNotFoundException: [packagename].AndApp in loader
dalvik.system.PathClassLoader[/data/app-private/[packagename]-1.apk]
The weirdest part is, that the Class it is searching for here does not exist and never has. The app itself does nothing than show some text in a textview. In Android 1.6 I dont get this problem and I cant see a reason, it event works in 2.1. The Manifest looks like that:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="[packagename]" android:versionName="1.02" android:versionCode="3">
<application android:label="@string/app_name" android:icon="@drawable/stop_48"
android:description="@string/Description" android:name="@string/app_name">
<activity android:name=".DefaultActivity" android:label="@string/app_name" >
<intent-filter> <action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter> </activity>
<uses-sdk android:minSdkVersion="4" android:targetSdkVersion="4"</uses-sdk>
</manifest>
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Nov 2, 2010
I want to add sound in android web view application. ( The sound should be play when click a button in the screen.) My html application worked in the browser. But not worked in android.I don't know why? My code...
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Apr 17, 2010
I need to display contents of a list of objects. Capture the selected items and later process it. I have been trying to find a tutorial on net but in vain. Could some one please advise me when can I find a tutorial. I know how to display a list but I want the CheckedTextView option.
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Mar 5, 2010
I was working through the Notepad tutorial... http://developer.android.com/guide/tutorials/notepad/index.html ...and I seem to either have a misunderstanding of what is supposed to be happening, or the code is not working.
Below are two snippets of code from the tutorial to illustrate my questions/concerns:
It looks like this is the "menu" that is brought up when you have no items selected and you press the Menu key...
CODE:...........
This is the behavior that I expected and saw.
However, when I have one of the notes selected, I would expect this code snippet to run...
CODE:.............
But it doesn't. I can never get the "delete" option to show up in the tutorial.
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Apr 5, 2010
I've never used bettercut and am after a tutorial. I have this homescreen. want to change the GMail icon to the same green as everything else.
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Nov 11, 2009
Android has a limit to rum at MAX 20 concurrent AsyncTask. To handle this limit I created a AsyncTaskPool.java utility. Its not a pool in true sense but a kind of scheduler.
CODE:..................
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Nov 15, 2010
I'm on Mac OS X Leopard and installed the ADT plugin into Eclipse Galileo. I followed all these steps to get started:
http://developer.android.com/sdk/index.html
My SDK version is 2.2 API 8 revision 2 and I just used the Hello World tutorial found here:
[url]
When I first created the Android application, I saw this error in the Eclipse console:
[2010-11-13 18:20:43 - HelloAndroid] ERROR: Unable to open class file / Users/mydirectory/Documents/workspace/HelloAndroid/gen/com/example/ helloandroid/R.java: No such file or directory
I commented out this line to fill in the few lines from the tutorial:
setContentView(R.layout.main);
When I ran the app, it launched my emulator but all I saw was a vertical screen on the left that said "ANDROID" and phone buttons on the right. I did not see the "Hello, Android" text from the tutorial.
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