Am I able to hook file system on Android?that means before a file is opened by other application, a registered function by the third application is invoked, and in the registered function, it can decide whether permit other application to open that file.
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While doing normal day-to-day Android development, is it safe to assume that hook methods called by the system will not pass in invalid references (ex.: null), or should I always be double-checking what arguments get passed in?For example, can the method onOptionsItemSelected(MenuItem) ever have a null MenuItem reference passed into it?The reason I ask is because I was working on the Notepad 1 tutorial,I started wondering if I should be testing if item is null before making a getItemId() method call on it, or just trust the system to not ever pass me a null?I don't want to make my code slower by doing null checks when I shouldn't be worried about that happening, etc.
View 1 Replies View RelatedDoes the X use a FAT32 file system? Is there any way to change this? I'm asking because I have a 4+GB mkv file I want to put on it, but I'm getting a message telling me its too large for the file system. If no way to change, then can anyone suggest a way to make this file small enough to fit?
View 11 Replies View Relatedi had one that was very seemless and felt much like windows xp sort of. but i factory defaulted my device the other day and now it gone and oddly i don't remember the name of it.
View 3 Replies View RelatedI need to save some persistent data (byte array) in my application.I decided to write these data into a file on the Android hardware.But I cannot create a file under /system/ or /data/.Can any body tell me under which directory can I create a file to save my data except SDCARD(Because We cannot suppose every Android has a SDCARD)?
View 8 Replies View RelatedI am wondering that how android is providing security against corruption of data in file. I also want to know about security model for Shared Preferences, Sqlite datbase etc. storage methods.
View 2 Replies View RelatedI am trying to read system logs in my code to generate something like an error report. Similar to adb logcat, but in a programming way.
View 1 Replies View RelatedI am developing a photoshop application for the G1 where you can apply different filters to your pictures stored in the pictures folder. So I use a gallery and a cursor to select the picture I want to manipulate, copy the picture to a bitmap so I can perform some filter operations and afterwards save the new bitmap as a new file to the phone. So I figured out that there are basically two options I have to save the image. One is to use the MediaStore.Images.Media.insertImage() method, which generally would work, but I don't want a thumbnail to be created. The second option, which I actually use, is to use an OutputStrem.
import android.provider.MediaStore.Images.Media; import android.content.ContentValues; import java.io.OutputStream;
// Save the name and description of an image in a ContentValues map. ContentValues values = new ContentValues(3);
values.put(Media.DISPLAY_NAME, "road_trip_1");
values.put(Media.DESCRIPTION, "Day 1, trip to Los Angeles");
values.put(Media.MIME_TYPE, "image/jpeg");
// Add a new record without the bitmap, but with the values just set.
// insert() returns the URI of the new record. Uri uri = getContentResolver().insert(Media.EXTERNAL_CONTENT_URI, values);
// Now get a handle to the file for that record, and save the data into it.
// Here, sourceBitmap is a Bitmap object representing the file to save to the database. try {
OutputStream outStream = getContentResolver().openOutputStream (uri);
sourceBitmap.compress(Bitmap.CompressFormat.JPEG, 50, outStream);
outStream.close(); } catch (Exception e){
How can I copy files to the file system (place) in android? How can I access it?
View 5 Replies View RelatedI have an application that I want to be able to use the userid: android:sharedUserId="android.uid.system", I need to sign the .apk file with the same certificate as the built in system applications, such as the 'Settings' application. I've located the keystore file in my build directory which is: cacerts.bks, and I have the password for this. What I seem to be missing in order to sign my .apk file is the alias fo the keystore. Does anyone know what the alias is? Or is there an easier way to do this that I'm missing.I know this not a standard thing to do, and is perhaps a hack, but I have a client requirement to meet.
View 2 Replies View RelatedI'm trying to re-partition an SDCard on Android, with root access. What I'm trying to do is resize the 5.9GB partition into 3GB, and then make an EXT partition with the remaining space. I can think of two ways to do this, but I'm a bit stumped in doing either of them: 1) Cross-compile GNU parted, and run it on Android to modify the filesystem in place. This would be my preferred method, but I've been trying to statically compile parted using scratchbox and haven't had much luck, and I haven't been able to dynamically compile for Android in scratchbox either. 2) Directly modify the 512 byte MBR using some utility on my computer, and then dd the file on Android. I have a tool to view the MBR (mbrwiz), but I don't know how to edit it. Does anybody have any suggestions for either, or possibly a third route?
View 2 Replies View Relatedhow to know which type of file system does my android device using ?
View 2 Replies View RelatedMy objective is to create a text file in an android file system.
Using java language, I am creating an app. It has a screen with a table of 3columns. Each time a user enters the table row and click on Submit button, the row entry should be created as a separate comma-separated file on an android device. So each time when the table gets updated with new entry and clicks a submit button, a new file is getting created on the device file system. So I am looking for the file connectivity to the internal device memory where I could open the files and access it.
I have done the same in Nokia mobiles using J2ME. But for Android, I am not able to find the device file path.
I had format my phone's system through cwm.
now i want to restore it but it just stuck when i power on my phone.
First I found the problem, then I found this truly ancient post:
http://groups.google.com/group/android-developers/browse_thread/threa...
...with no responses. To browse the file system from the top down I suppose I can simply hardcode the root as a single slash, but I would rather "do it right". Can anyone explain why listRoots returns a root named "/XX" where X is a junk char? It's problematic because that file cannot subsequently be queried for further file system exploration.
I am trying to copy an image to the emulator sd card by: $ adb push ~/Desktop/bullet_ball_ glass_red.png /sdcard /bullet_ball_glass_red.png But I get an error saying: failed to copy '/Users/n179911/Desktop /bullet_ ball_glass_red.png' to '/sdcard/bullet_ball_glass_ red.png': Read-only file system So I tried to go to adb shell to manual change the /sdcard to non read-only, but it still wont let me. $ adb shell # su # chmod 777 /sdcard Unable to chmod /sdcard: Read-only file system #.
View 8 Replies View RelatedI had built the system.img file in linux ubuntu OS for Android. I copied the system.img file in the widows SDK at /out/packagees/ target/generic directory. But when i am trying to start the emulator its not starting. And the logcat messages are not shown.
Is it possible to build the system.img in ubuntu and use it in windows.
In android am using the SDK 1.5 am using the Database concepts to create the Sqlite Db file but i don't know where the file is stored. any one help me to find that Db file in my system please.
View 6 Replies View RelatedAre there any temp, volatile directories in the Android file system that get wiped once the device is off? In Linux we have /tmp, but this doesn't seem to exist in Android.
View 3 Replies View Related2 days ago I tried to update my aunts sensation xl and told her that it is better to update its ROM from 2.3.5 to 4.0.3. So i created a google account in phone and added it in order to sync contacts....and after 2 hours, I thought that it has been synced...After upgrading device to ICS, and adding the previous account that i made before upgrading, I was waiting for contacts to restore, but nothing happend.. I opened the gmail account on PC and saw that there was no contacts. So the only way for me to restore the contacts is to find a way to restore them from Phone device. So,is there any software, either on phone or PC, to restore contacts from phone? or is there a way to have access to root folders and files of phone on PC to use a recovery program to restore "Contacts.db" file that was erased while flashing ICS?
View 5 Replies View Relatedi edited /system/etc/hosts file but it looks that my edit is ignored by Android.
In "hosts" file i added line with text "1.1.1.1 customdomain" And then i used "ping customdomain" command in Terminal Emulator but i got error "unknown host am".
why android not support NTFS file system. I think NTFS more speeder than FAT and FAT 32 and other file systems. So is it technical or patent issue? I think NTFS file system developed by Microsoft
View 7 Replies View RelatedI have a HUAWEI Y300-0100, and it comes with a funny feature: every time it can't connect to WIFI a popup message appears saying that if you switch to data plan charges may apply.
I am constantly switching between WIFI/no-WIFI zones so that message really bothered me, and I searched a way to disable it.
Presumably, the only way to do that is by modifying a system file called "build.prop". I already had my phone rooted so doing so wasn't very hard.I used Jota+ to change a setting from "true" to "false" (ro.config.hw******), and saved the file in the root of the SD card. Then, with ES File Explorer, I renamed the "build.prop" in /system to "build.prop.bak" and copied there the "build.prop" I previously saved in the SD root.All seemed to be fine, except that after rebooting my phone it could not get past the HUAWEI logo.
Android recovery mode seems to work, but I don't know how to use a lot of its options nor I want to do a Factory Reset if there's a better alternative.Is there a way to modify system files before booting Android? I really would like to try to delete the "build.prop" file and rename the "build.prop.bak" back to "build.prop".
So after a failed attempt to upgrade from CyanogenMod 10.1.3 to 10.2, I was unable to access /data or /sdcard because both systems were encrypted. I ended up having to factory reset my phone because it refused to co-operate or let me access my files. However, before I did that, I was able to run
Code:
adb shell "dd if=/dev/block/mmcblk0p2" > data.img
and
Code:
adb shell "dd if=/dev/block/mmcblk0p3" > sdcard.img
Which appears to have copied the raw partition images from the phone (at least, they're the right sizes).
According to my reading, Android (and, I'm inferring, CyanogenMod) encrypts filesystems using dm-crypt, with a AES-CBC ESSIV:SHA256 cipher, with the key being derived from the password using PBKDF2. Knowing the precious little I do about encrypted file systems, my guess is that if I configure the image in cryptsetup to create a drive mapping, I can mount the mapped drive and recover the data from the images.
According to /fstab.herring on my ahem, fresh, install of Android, the /data partition is in ext4 format whereas the /sdcard partition is vFAT. So, once I've gotten through the encryption on the partition images, they should mount normally, right?
I know that dm-crypt accepts plain, LUKS, LoopAES and TrueCrypt device formats. I'm inferring from the PBKDF2 extension that Android goes the LUKS route for encrypting. Is this conclusion correct?
Whether it's possible to decrypt a dumped android image? I'm really hoping that the cypher information is stored on the file system and not on some key file that I nuked in the factory reset. If it can, in theory, be decrypted, am I using the right tools to approach the matter? If so, I'll continue fiddling with cryptsetup and mount, but no sense in wasting time if it's an impossible task.
1) I am using Eclipse IDE and Android SDK 2.1 for my application. My application reads some data files from the File System, so using DDMS i push all the files in "/data/data/com.mypackage/" folder and run my application on emulator. I am able to see my desired output properly on the emulator.
2) Now i have Android device and i don't know how to push the files in the Internal memory of the phone. I have installed driver CD. But it only shows me the SD card directory.
3) Actually what i want is that the moment my application is installed and run it should read the data files from the file system. So there should be no added efforts to push the files in the file system.
4)Means can i pack my data files with my .apk file and when the apk is getting installed can the data files be placed directly in the internal memory(file system) i.e. "/data/data/com.mypackage/" folder. Is this possible ?
Hi, I want to create an application in android which at runtime calls an xml file from some path of the system.And make that contents of the xml file run in the same application.Could i get a feasible code because at runtime the bytecode of the activity is already created.how do i compile and run the activity and runtime.Also i was facing problem reading the xml file.Need some suggestions asap.. Thanx in advance!!
View 3 Replies View RelatedIs it possible to access the filesystem of an sdcard image through something like Windows Explorer?
i.e. mount the sdcard as a drive or web folder or something. I have some xml files stored on my sdcard image which I frequently want to edit.
Ideally I would like to be able to edit these files directly using my fave xml editor (either through the filesystem or webdav).But is this possible?
If not, is the only alternative to pull the xml file from the sdcard to the dev machine filesystem, edit and the push it back?
I deleted (accidentally) some system files, and then nothing happened, but i hit the restore or backup from setting and it went fine untill the loading screen, i mean it shut down then the first loading image fine and the next one doesn't load my system.. What can i do? (I think i know what software i shouldn't have deleted).
View 3 Replies View RelatedI've searched to no prevail. id like to start developing apps but am having issues getting the environment set up. I have the jdk properly installed.
issue 1 (main major ):
I've installed the android sdk from multiple sources, but when i try to start sdk tools, the command prompt flashes/ opens briefly and i get this message:
"Failed to execute toolsandroid.bat: The system cannot find the file specified."
Do i need to change a PATH variable or something...
I cannot get eclipse to run. when i try to open the exe file ( because there is no short cut icon...?) it gives a message about not finding a companion library... ive try to change the properties in the file that is supposed to fix it, but it was already set the way its supposed to be. this is not major as i can use a different IDE.
so im completely lost as to th sdk tool. I just tried adding the file path to the android sdk ( PATH variable) and it still did not work... I also just tried start the android,bat file and the cmd promt flashes briefly saying somthing about xcopy is not an operable command...etc couldn't read all of it... I am on windows 7 home premium
I have a android tablet and I have tried rooting it and I get things like "read only file system" and I looked into it and my /system is read only.. Rooting is putting .su in the xbin or bin inside of the /system. But my /system is read only so i can't root my tablet?
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