Android :: Supporting 1.5 Features From 2.1 And No Reflection?
Jul 30, 2010
I currently have an app on the market that supports Android 1.5 (SDK level 3) and up. It also takes advantage of several features that are only present in Android 2.0 (SDK level 5) and up. I do this using Reflection.
I read a post on the Android Developer Blog that talks about how to support these new features while using no Reflection, which would be amazing. http://android-developers.blogspot.com/2010/07/how-to-have-your-cupcake-and-eat-it-too.html <uses-sdk android:minSdkVersion="3" android:targetSdkVersion="5" />
I have tested this out and while it works there is one huge downfall. Currently if I try to add a SDK level 5 class, but I don't know that it's a SDK level 5 class, there is no worries. Eclipse isnt going to find the class and I'm not going to be able to add it.
Using Google's recommended method does allow me to add the classes and gives me no notification that this code is targeted just to SDK level 5 users. This opens up too big of a possibility of adding in code that would break some users without knowing.
Does anyone know of any plugins, options, etc that would warn me at the places I have targeted SDK level 5 to keep this from happening?
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Jun 1, 2010
I have been trying to use reflection for a specifiec Field in the android.os.build class, the MANUFACTURER field...
I have tried by using this code :.............
I am gettign the following errors :
code:..........
And when debugging I noticed that InvocationtargetException is continuesly thrown, so I am guessing I haven't been implementing the whole Reflection principle correctly...
Any idea where things are going wrong or otherwise on how to implement Refelction for a single Field correctly ?
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Jun 15, 2009
Does dalvik have any limitation it puts on classfiles, mainly size related? In groovy we have a huge class thats need to be able to be reflected upon, but it silently fails. IE theres no error during build(dex) or load time but calls to the reflective methods throws a no such method exception. This file is above 13000 lines of code and contains a vast number of methods so size limitations seems probable, or are there any other ways reflection can fail for a normal java class? Oh, and cutting the file down in size made it work but is not optimal since it contains all of groovy's utility methods.
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Nov 5, 2010
I'm writing an android app that requires binding a JSON object into a domain entity with the keys from the JSON as instance variables. Since there are several domain entities, each with different instance variables that the JSON needs to bind to in the app, i'd like to write a method such as ths following: Loop through all the instance variables from the domain if a key exists in the JSON with the name of the instance variable, take the value for this key from the JSON and set the Domain's instance variable with this key name equal to this value. The reason i'm interested in the doing the binding from the class to the JSON is because if the JSON changes for some reason, I don't want it to break the app when the instance variable doesn't exist in the app's domain for a specific JSON key. Code...
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Jul 6, 2010
My point is to be able to call a 2.1 API if it exists, while the application should be able to run in 1.5
Specifically, I am making a GPS application which would like to call android.location.LocationManager.addNmeaListener if available. My problem is that this call takes as parameter an abstract class (GpsStatus.NmeaListener) which I cannot pass directly to Class.GetMethod (or my application won't work in 1.5). What I am currently trying is a) to create a wrapper class for GpsStatus.NmeaListener:......................
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Feb 17, 2013
I work at a small company that fields autonomous android devices which programmatically connect to bluetooth telemetry devices. These devices require pins, so we need to automatically create a pairing in order to connect to the bluetooth devices. We DO have root access.
Since the new Bluetooth Stack in Android 4.2, I have been unable to use this common AIDL bluetooth reflection method in our private utility app:
Code:
public IBluetooth getIBluetooth() {
IBluetooth ibt = null;
try {
Class c2 = Class.forName("android.os.ServiceManager");
Method m2 = c2.getDeclaredMethod("getService",String.class);
IBinder b = (IBinder) m2.invoke(null, "bluetooth");
[code]...
The issue about this strategy no longer working is documented here. I previously used the setPin method as well as the createBond method from this Interface, and now I cannot.
Is there anyway to manually create a bluetooth pair profile under Android 4.2? Is there a database file where the profiles are stored that we can use root and sqlite3 to access?
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May 7, 2014
I've been going over the android sdk for the past year to find out if there is a way to change the network type(2g/3g/4g), in phones with root access.However I couldn't find any way to do this.Asking around,someone told me that I could do this using reflection,by calling a method on a phone instance.Looking through the source code,I did find a setPrefferedNetworkType(); method in the Phone Interface,inside the internal telephony package.Is there anyway I can use this to solve my problem.I can't seem to find a way to get an instance of a class that implements the interface.Or is there any other way to do it entirely?
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Apr 24, 2009
I have see some apps in Android that use some packages:
import android.net.http.EventHandler; import android.net.http.Headers; import android.net.http.RequestQueue; So some packages do not support the current version of SDK. Where can I find it? Would u tell me about it?
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Oct 27, 2010
How can I localize my application to support some Right to Left languages? How can I localize my application to support Hebrew? Arabic? and other languages?
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Mar 31, 2009
When we try to implement orientation in AP layer, we can set "android:screenOrientation" parameter in AndroidManifest.xml file or call "setRequestOrientation()" method of Activity class. But if I want to porting android in new HW device, how can I do? Do I need to modify the graphic driver, or just add configuration in program. (Actually I do some experiments but my AP cannot rotate) Besides, can every experts tell me when I set the "android:screenOrientation" parameter, which process will read this configuration, pass to where and which process will do the rotation?
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Jan 15, 2010
I am new to Android. Can any one please tell me the phone models which support RTSP video(H.264) streaming?
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Sep 15, 2009
Are there any apps in the DONUT sdk that has support for the WVGA (looking just not for resized or compatibility mode, but having the proper assets to support 240dpi WVGA) Just looking around, dialer look awkward, so does few others ..
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Dec 17, 2009
I was hesitatnt to download it, but I love tabbed browsing so i figured I'd give it a shot. Well i love the browser itself, but I tried downloading a ringtone from myxer.com and it says it cant finish downloading because i need to clear space on my phone. But i have space and i tried using the stock browser and it worked fine.
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Nov 26, 2009
O2 forum has launched a Poll regarding the Galaxy i7500, pls cast your vote O2 Forum :: View topic - Samsung no longer supporting Android on Galaxy
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Jun 11, 2010
In the Supporting Multiple Screens document in the Android Dev Guide, some example screen configurations are given. One of them states that the small-ldpi designation is given to QVGA (240x320) screens with a physical size of 2.6"-3.0". According to this DPI calculator, a 2.8" QVGA display equates to 143 dpi. However, further down the page the document explicitly states that all screens over 140 dpi are considered "medium" density.
So which is it, ldpi or mdpi? Is this a mistake? Does anyone know what the HTC Tattoo or similar device actually reports? I don't have access to any devices like this.
Also, with the recent publishing of this document, I'm glad to see we finally have an explicit statement of the exact DPI ranges of the three density categories. But why haven't we been given the same for the small, medium, and large screen size categories? I'd like to know the exact ranges for all these.
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Jun 9, 2010
I have read the topic about supporting multiple screen size as well as different DPI. I am wondering which of the following way is better in supporting multiple screens:
1. Have different layout for different screen size (stretch the images)
2. Have different set of graphics for different screen (use the same layout)
3. Have different set of graphics and different set of layout for each of the screen
Which way is the easiest? And which way is the most optical way to design? Or is there another better way?
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Feb 17, 2009
We understand aapt has support only for small and numbers. Any reason for not supporting capital letters.. in future could we expect support for the same.
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Jul 25, 2010
I've read the article "Supporting Multiple Screen" on Android developers site. But that doesn't apply to game logic.Let me get straight to the point. My situation is as follows:
- I'm creating a game using LunarLander code as a base.
- In my game, there'll be an object flying up from the bottom of the screen. The object will fly in projectile motion.
- I set the starting velocity, gravity and angle so that the highest point(of projectile motion) is almost at the top of the screen.
- The screen tested is Motorola Milestone. (480x854 resolution) Meaning the object travels around 854 pixels vertically.
I'm thinking of adjusting starting velocity based on screensizes. But that sounds unreliable when we've so many devices/resolutions out there. How do you combat these kind of problem when making games?
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Apr 13, 2010
I've read the Android documentation:
http://developer.android.com/guide/practices/screens_support.html
but still have some questions. I'm trying to design a music application which basically has images of the instrument (ImageButton) that play a sound when clicked. However, I'm confused about how to have the ImageButtons scale to fit all the different screen sizes and how to position them.
Which layout is best used for needing to position ImageButtons in specific locations on the screen? (i.e. cymbals on a drum set) FrameLayout, RelativeLayout? If I only really care about medium and large screens, do I need to create different resources (images) for both as well as a different XML layout to position them? I'm trying to find the simplest way to do this without having to create a separate layout XML file for positioning/size and separate image resources for each screen.
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Jul 9, 2010
I am working on an Android application which is supposed to play videos over HTTP on Android devices. Before we setup a server to host the video files just wanted a few things clarified: As per the developer documentation, Android supports .mp4 and .3gp container formats for video. If we use H.263(video) - AAC LC (Audio) audio-video codec used for our media files will we be able to play the video by passing the URL to MediaPlayer class?
I did a little experiment and passed URL of one of the video files(.mp4) to the MediaPlayer class and got the following error:
Command PLAYER_INIT completed with an
error or info
PVMFErrContentInvalidForProgressivePlayback
From the docs, I came to know that for progressive playback, the video's index (e.g moov atom) should be at the start of the file. Questions:
1. How do we make our videos Android-ready?
2. What are the different considerations that we need to make?
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Oct 30, 2009
I have had several emails from people with HTC Tattoo devices who say they cannot find my app in the Market.
After reading this page (http://d.android.com/guide/practices/ screens_support.html) I believe I have to add the <supports-screens> tag to my manifest file. However, when I try to do this I am confronted with "Error no resource identifier found for attriute support-screens in package 'android'" messages. What does one have to do to update their manifest to tell the market an app supports all screen sizes?
Furthermore, if I need to change the android:minSdkVersion from "3" to something higher or add the android:targetSdkVersion tag, will this prevent people with older versions of Android from using my application?
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Aug 15, 2010
I have just started with Android development and bought a handset(HTC Hero) for test and usage purposes. The sad part is that it doesn't display one of the scripts (Devanagari to be precise). Hence, I would like to contribute to the Android project to help render it. However, since I have just started I have no ideas of where to look for and begin with !
To be very precise, I would like to contribute for proper rendering of Nepali Language (Devanagari Script) for the Android OS. For ex. I would like to be able to see the following in an Android device rendered properly......................
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Oct 20, 2010
I created a list view in an activity and the list shows some fields.When we click a list item a custom dialog should pop up and the user can enter some new value to this field.The custom dialog contains one edit text and two buttons ok and cancel.It is working fine.But when my list is more that means if it exceeds screen size it is showing scroll.But when we select bottom items which we can select using scroll the dialog is appearing in normal fashion.But after entering new value if i am trying to save the application is getting crashed.
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Jul 25, 2010
I am a fresh developer on Googles Android Platform - my HTC Desire arrived last week. Now i need a way to sign in to my existing application (Java, currently running on jetty). The server Application is developed using spring security 3.0.2
In my case, i want to support the following: If a user has set up his Android phone with a googlemail/google-Account (and most users do) i want to use this account credentials to automagically log in to my server app.
Is there any Android framework supporting that use-case? Or are there any alternatives? I read: http code.google.com intl/de-DE/apis/accounts/docs/OpenID.html
How we do sign in with an app on google AppEnging is described here: http://blog.notdot.net/2010/05/Authenticating-against-App-Engine-from-an-Android-app
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Aug 18, 2010
I'm building a game with graphic assets in hdpi resolutions (hence I put the files in drawable-hdpi directory). I don't want to have a corresponding mdpi resolution of the images, and I will code everything in 240-dpi based pixel coordinates.
Is it possible to still allow mdpi and ldpi devices to run the application, by automatically scaling the graphics from the hdpi version? Optimize for high-dpi devices only but still support (small- and) medium-dpi screens.
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May 7, 2010
What is the secure way to store passwords on android device?
I found same topic in "Android Developers Group". Steve918 kindly shared a sample code for it but I can not download it anymore. http://steven.bitsetters.com/articles/2007/11/20/android-password-safe/
Does anybody know how to encrypt/decrypt password using Android supporting secure algorithm?
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Aug 19, 2010
My application will have two layouts, one for large screens and one for normal. For testing I'm working with one phone (800x480 240dpi) and one tablet (1024x600 240dpi) but both are detected as large screen hdpi and long aspect ratio, so I'm not able to assign different layouts.
The only approach I think that can work is to create layout-large and layout-normal, get the resolution and programmatically set the layout folder. Is that possible?
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Sep 2, 2010
I am very new to android,i developed an sample web application and hosted it apk build file in different android version and on different sized devices,here i am getting problem in my design of layout such as listview not being displayed properly bottom portion is not displayed well and the align is not so good.
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Oct 18, 2010
I have developed an application which en-composes list views and posted that .apk file in my htc device, the design and alignment everything works fine,but the problem When i am testing in various devices such as Morotolo Droid,Nexus Devices the alignment of Listviews goes wrong, so i planned to use the Layout folder as layout-hdpi,layout-ldpi, and layout-mdpi, for that i changed my manifest file as
<supports-screens android:largeScreens="true"
android:normalScreens="true" android:smallScreens="true"
android:anyDensity="true" />
Is it right putting android:anyDensity="true",also i used dp instead of dip. I went through this url, but still am not able to get a clear idea in this
http://developer.android.com/guide/practices/screens_support.html. so friends pls tell me(help me) to get clear idea in this and tell what mistakes i have doing. This is my main page xml code frnds.
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost" android:layout_width="fill_parent"
android:layout_height="wrap_content">
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/background_retinav2">
<LinearLayout android:layout_gravity="center" android:foregroundGravity="bottom" android:background="@color/white" android:id="@+id/rl_1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal">
<ImageView android:paddingTop="3dp" android:id="@+id/starthideimage" android:layout_width="30dp" android:layout_height="35dp" android:src="@drawable/newback" />
<HorizontalScrollView android:paddingTop="8dp" android:id="@+id/gv"
android:layout_width="wrap_content" android:layout_marginTop="0dp"
android:layout_height="wrap_content" android:background="#ffffff"
android:scrollbars="none" android:layout_weight="1" android:foregroundGravity="bottom">
<LinearLayout android:id="@+id/san_tag" android:layout_width="wrap_content" android:layout_height="wrap_content">
</LinearLayout>
</HorizontalScrollView>
<ImageView android:paddingTop="3dp" android:id="@+id/Endhideimage" android:layout_width="30dp" android:layout_height="35dp" android:src="@drawable/newforward" />
</LinearLayout>
android:id="@android:id/tabs"
android:gravity="bottom"
android:layout_gravity="bottom"
android:listSelector="@color/gray"
android:layout_width="fill_parent"
android:layout_height="wrap_content" /> </TabHost>
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Apr 19, 2010
I recall reading about the Incredible supporting flash out of the box. Is this true?
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