I have written some apps, but have a general question. If I were to write an improved version of - let's say - TextView. Is it possible to make all app's on the system using this class, basically replace TextView? How are the java classes on the Android system, are they compiled, can I replace the library? Is this protected?
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With the NDK I can wrap a native library so I can call the methods from Java and package that library into my application.
Say I want to package a custom version of SQLite, is there any way to override the system library for SQLite, so I dont have to reimplement the SQLiteDatabase class?
I am an Android app developer, and I have purchased a Nexus One device which I use to continuously test my developed Android applications.
Background: ----------------- One of the applications I developed uses a native shared library (e.g. myNativeLib.so). Only my application loads & uses this native library. I had developed this app before Android NDK came out. I pack my native library into my apk's 'assets' folder, and during my application start- up, I extract this native library from my package's assets folder to my app private directory (i.e. <assets> -> /data/data/<myappprocess>/ myNativeLib.so). Then I use System.load() API in my application to dynamically load this native library.
Problem: ------------ This application was developed during Android 1.5 (i.e. cupcake) days {I didn't have the Nexus One then}. The above procedure has been working without any problems right from Android 1.5 to Android 2.2 (i.e. Froyo). I have also tested the same on my Nexus One for Android 2.1 (i.e. Eclair) and Android 2.2.
The problem began the moment I recently upgraded my Nexus One to Android 2.2.1 via the FRG83 system update. Now, whenever I try to load my native library, I get the following error:
D/dalvikvm( 3653): Trying to load lib /data/data/<myappprocess>/ <mynativelib>.so <some address> I/dalvikvm( 3653): Unable to dlopen(/data/data/<myappprocess>/ <mynativelib>.so): Cannot load library: link_image[1995]: failed to link <mynativelib>.so
What I have Tried: -------------------------- 1. I tried my application using Android 2.2 SDK (emulator)...it works, no issues. 2. I checked out the latest froyo & android2.2.1 source code from Android open-source, built & tested my application + native lib using the latest froyo source...it built & ran, no issues. This should've taken care of any changes in the native code dependencies between Android 2.2 & Android 2.2.1 3. I even checked Android 2.2.1 source code for dalvik (java System & Runtime classes) + bionic (linker & dlopen sources) between Android 2.2 & Android 2.2.1 (using source checked out from Android open-source), but couldn't find anything consequential 4. I am unable to return my Nexus One to Android 2.2.
i was trying to change the background for my x'pop 5035D cause i'm in jelly bean 4.1.1 and all the backgrounds for the system is white and it's very bad for my eyes specially at night ,
i was trying to modify framework-res.apk that exist in :system / framework but i couldn't so i thought i can replace it and i downloaded another frame work- res.apk and i used root explorer to replace it after taking a copy of the original file and since i did that the device restarted and stuck at the logo and i can't boot.
i tried every thing , i did nandroid restore and even wipe data / factory reset and the same result it just stops at the logo every time .
Is it possible to write data or create folder in system directory like /system/media/audio/alarms. i.e other than our respective package.
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I think I ran the root application again and at some point I started getting this error message when in recovery. I have since run the one click root method to unroot the phone and the little nija dude is no longer there. Since I rooted the phone it will no longer connect to my wireless network, it finds the network and attempts to obtain an ip address. After a few min it times out and tries again. When I load the phone recovery the error message is still present.
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I use Java API "System.setProperty()" to set a system property. After invoke "System.setProperty()", API "System.getProperty()" can return the value just I set. However, when I use command "adb shell getprop" to verify, it shows that this property is not set at all. Do I wrongly understand API "System.setProperty()" ?
View 9 Replies View RelatedI'm engineer but more from a chip/assembler x86 level. I'm new to Android. Still figuring some general things out. I have written some apps, but have a general question. If I were to write an improved version of - let's say - TextView. Is it possible to make all app's on the system using this class, basically replace TextView? How are the java classes on the Android system, are they compiled, can I replace the library? Is this protected?
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On the Samsung Galaxy S for example, the Tab views, the ListView highlights, Menu Items and Summary line on the Preference Screen are all blue.
There are many apps which immitate the style of the Preference Screen and I want to do the same. Obviously I cannot just hard code and set the colour to Blue, as other handsets use different colours.
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So i realized today on my way home from work that my cars Clarion CD deck has a USB connector for hooking up thumb drives to play music off of them. I figured this HAS to work with the G1 and it does!I was able to hook the G1 charge and play the music off the SD card through the G1 with ease.Just set the G1 to act as a usb drive, and you can play music and charge your phone via USB while driving.So keep that in mind if you're going to be getting a new car CD player, get one with USB (pretty common on new CD players) and you'll be glad you did.
View 45 Replies View RelatedI've seen references on how to SET system colours, but I need to find out how you GET them - how do you find out what they are? On the Samsung Galaxy S for example, the tab views, ListView highlights when you select an item, and the Summary text line on the preference screen are all blue.There are many apps which immitate this style and I want to do the same. Obviously I cannot just hard code and set the colour to Blue, as other handsets use different colors.The question is, is there a way to programmatically find out what colour the Preference Screen Summary Line, Tabs, or ListView selections are, so that you can then set that against a TextView elsewhere in your app?How do I get the android system colours?
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I see that a lot of folks recommend "Spare Parts" as a app to monitor system usage. Are there any other apps out there that do the same thing? The main reason i ask is because Spare Parts doesn't seem to have the greatest reviews so i have been debating on installing it.
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I am currently writing the backend for a service which has 3 clients: browser, android native and iphone native. I am having a little trouble with coming up with an authentication system since I don't know what can really be done on the clients.
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Now the real question is, how should I come up with an authentication system?
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I have looked at foursquare's API and their basic auth method requires you to pass in user:password in every http request header. That adds 1 additional authentication each call which can kind of seem excessive.
I saw some application that can use the "system" camera instead of having just a blank camera preview? ie, the camera preview is the same as the default android camera application with full control. how do i access that?
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