General :: How To Read / Write To Apps Shared Prefs Files Within App
Feb 19, 2012
I want to add a feature to my app so i can backup so that the user can backup certain shared_prefs files of other apps (located in data/data/package,name/shared_prefs). I dont want to modify them, just backup and overwrite.
My app has root privileges.Ive tried this a few times but i cant get it to work, im just getting a file not found error when uploading.Ive tried mounting data/ as read/write but that didnt work or i did it wrong.
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Feb 17, 2010
How do I create a shared directory with read/write permissions to all applications installed on my phone and that is not on the sdcard?
I tried that :
File f = new File("/tmp");
f.mkdir();
but it is not working.
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Oct 22, 2013
I want to write a program to read PDF files. Where should I start if I do need a special library?
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Mar 13, 2010
How to write/read log data into txt file in res folder.
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May 3, 2010
I have an application that can read and write txt files to the phones sdcard. By using this code for reading files:
@Override protected void onListItemClick(ListView l, View v, int position, long id) { super.onListItemClick(l, v, position, id); mFileNameOpen = files.get(position);
String st = null; mVector.clear();
notepad.mNewEmpty = false; try { File f = new File(Environment.getExternalStorageDirectory()+"/ notepad/"+mFileNameOpen); FileInputStream fileIS = new FileInputStream(f);
BufferedReader in = new BufferedReader(new InputStreamReader(fileIS));
do { st = in.readLine();
mVector.add(st);
}while(st!=null); in.close(); ...
} catch (FileNotFoundException e) { e.printStackTrace();
} catch (IOException e) e.printStackTrace();
and this to write them:
try { File root = Environment.getExternalStorageDirectory();
File fileCheck = new File(root, "/notepad/" + fileNameSave + saveExtension);
boolean exists = fileCheck.exists();
if (!exists) { if (root.canWrite()) { File textFile = new File(root, "/notepad/" + fileNameSave + saveExtension);
FileWriter textWriter = new FileWriter(textFile);
BufferedWriter out = new BufferedWriter(textWriter);
out.write(SAVEAS); out.close(); written = true;
} else { written = false; else { written = true; showMaybe = 1; showDialog(DIALOG_SAVE_EXISTS);
catch (IOException e) {Log.v(getString(R.string.app_name), e.getMessage());
This has been working fine on my Tattoo and all the emulators I've tried this on. But it does not seem to be working on moto droid. Is there something different to consider with moto droid? Or have I missed something in the manifest maybe?
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Oct 9, 2009
If there are multiple apps using the same jar file, it makes sense NOT to package the jar in EACH app. However since the jar file cannot be pre-installed on the device, what are other alternatives for developer.
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Oct 23, 2012
I did a backup using Titanium Backup and Go Backup and after wiping my Motorola Defy, tried to restore apps, contacts etc. The problems I encountered were:
1) Go Backup can't recognize backup directory on SD card for some reason.
2) Can't move apps to SD. An error occurs: "Move Application: Failed to move application. There is not enough storage left." Needless to say, I have more than enough storage.
This is was I encountered by far, although I believe these are just a small part of the symptoms for a single problem.
Maybe its because there are no permissions, or moving apps is impossible because of an existing app files on the SD card.
What is the actual cause for this? Or is there a tool to fix the permissions on the Defy?
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Mar 25, 2014
how to pull and push registers to i2c devices? (Especially camera)
I'm using RootTools to get the list of the devices: "busybox find /sys/devices/i2c*/*/*/ -name name"
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Dec 13, 2011
I've done this app Bookmarks Easy Import that import pc bookmarks (and folders too) in Android bookmarks but it required root because it read and write directly an Android database.
know if is possible read and write Android bookmarks from b4a or java application (via API?) in a non-rooted phone?
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Feb 10, 2014
I have a M919V Galaxy S4 which is compatible with both the i9505 roms and M919 (TMO) roms. I was on a i9505 TW rom and I decided to download a rom from the TMO section. When moving from a i9505 rom to a M919 rom, I had to flash the recovery corresponding to the model. So I downloaded the T-Mobile version of Philz Recovery, but I got a status 7 error. Then I downloaded the md5 version and flashed it via odin 3.07. It was successful. After flashing the recovery, I flashed Beanstalk rom for the t-mobile variant. Everything went fine until I tried to make a android of my current setup for Beanstalk. I kept getting errors. When I plug my phone in (with my sd card), and try to add or delete something, it say "remove write protection and try again". So I tried connecting my sd card to my sd card adapter. When I delete files from my adapter, the error message doesn't show up. BUT... after disconnecting and reconnecting it again, the files are back where they were. I tried reformatting it but nothing happens. It seems like my sd card is only read as write protected when connected to my phone but it has no idea which state it's in when connected to the sd card adapter.
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Feb 18, 2012
I developed a cramfs rom for the np7 after user dochoppy found root for the nextbook premium 7 tablet, but he then converted to ext3 which because its packed with features will be more popular. So I am trying to edit his ext3 rom in Ubuntu 11.10 and here is what I do:
1. Copy and paste system.img to desktop
2. Create a folder called system on desktop
3. In command prompt:
cd ~/Desktop
Sudo mount -t ext3 -o loop system.img system
(Asks for pw)
4. Doc said something about only being able to edit as root, so after some Googling I find out how to create a program that grants root.
5. (Open "run as" program) then I type "nautilus /home"
(Asks for pw)
6. Navigate to mounted system and I have read/write privileges (but only in this window)
7. View the system mount properties, and it says I have 14.2 mb free space on device
8. Delete files throughout the system folder to make room (but when I refresh properties, free space increase doesn't show)
9. Try to add my own files after deleting some others, ans rather than using the increased space, it just fills the fourteen megs before telling me "device is out of memory "
why is the system not physically making the proper system increase and decreases.
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Nov 13, 2012
I'm having a problem with ES file explorer. After several days I managed to root my HUawei U8800 Ideos X5 (Android 2.3.5) and obviously one of the next steps is installing CWMR. Unfortunately I'm failing here too. I tried to copy the recovery.img to the .cust_backup/image, but it keeps to say copy failed. Root access was given and I checked all four boxes in root settings. Someone in a german forum told me to update the binarys in SU, which failed too (it says sth like copy su to /system -> failed!). I'm not even sure ES FE would work if the binarys would be current.
I already tried the app Mount /system (rw / ro). It didn't work with this too.
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Mar 21, 2014
I'm looking for a method or an application for android tablet, which allows me to quickly reset the device deleting any data (from the Internet cache, and the cache to the photos of the various programs such as facebook, twitter etc ...) and that does not allow any modification of the operating system. I need this solution because I have a restaurant and I want to put a tablet on each table for guests to make him see the menu (full of photos and videos), surf the internet and play with the kids.
is there an app that allows this? or is there a quick way to do this, such as a multiaccount management ? I remember, for example, that for windows there are applications that completely erase any unauthorized modification, files and cache, at the time you restart the operating system.
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Jun 21, 2012
I'd like to know if there's a way to write files into the main directory just before the system shutdown, something like this:
End all processes (-> unmount disks?) -> mount /sdcard rw and / rw -> copy files from /sdcard to / -> unmount disks -> shutdown/reboot
Same with boot image (flash, in this case, and not copy / mod files)... is it possible? Or do I require to boot into recovery for these operations? I know I can remount as rw my system directory via ADB
Also, is it possible to do the same thing with the build.prop file? This, or during startup (before mounting partitions with standard permissions).
Of course, this having root (but not a special kernel to enable this kind of "before mounting" thing).
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May 9, 2014
I have tried to update my Honor C3 system updates. Then I noticed that I have completely lost root access. They removed su binary. Then I tried to root again my Honor C3 with VROOT and it is OK again. But I can't overwrite system files such as changing system DroidSans-fallback.ttf fonts and also installing framework of Xposed (Overwriting app_process). I can't even delete system files also.
I searched for firmware files for my phone and I can't seems to find it. There is root access and I even test it via Terminal Emulator app and from ADB. Calling su binary in Shell was OK but I can't access /system well. H30-U10
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Dec 15, 2009
I'll open with, I googled this thing like crazy, searched anddev and a few other boards (including this one) and can't quite find what I'm looking for.
The predicament : all CSV examples are in reference to contacts, and the file read/write posts (the ones that I need) make the assumption that I am not a beginner and most don't even post any code leaving me nothing to learn on.
The hopeful solution : a link to a solid example of simply how to write to a CSV with my own custom fields and values, and how to read a CSV and load said values.
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Nov 8, 2013
I am writing application to read information from NFC tag after that edit the information and write again to NFC tag without touch second tag (only read and write in the first touch). The data after write into the tag that is displayed into mobile. The processing is such as (Read tag=>Get Information=>Edit information=>Write Tag again=>Read information to display)I found some solution in the internet such as android read back the tag infomation after write, without second touch of tag...But when I implement it.It did not work for writing.
[HIGH]import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.Ndef;
import android.nfc.tech.NdefFormatable;
import android.os.Bundle;
[code]....
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Apr 26, 2010
My new HTC desire is unable to read or write to my 8GB SD card which was previously inside my HTC HD touch.
Why is this? I've swapped the SD cards around - i.e. the 4 GB SD card which it came shipped with is now inside my HTC HD touch It doesnt have a problem reading or writingto the 4 GB SD card that it came shipped with. I would prefer not to have to format the card
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Oct 6, 2010
In my application, I use MediaPlayer to record audio to a file.Can I read the file at the same time?
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Mar 13, 2010
how to read/write log data into a text file in android that file should be res folder.
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Sep 23, 2009
I am new for android development. I am trying read and write contacts to android addressbook.
I tried following line of code for write name into android.
CODE:.............
But i am getting "The application has stopped unexpectedly. Please try again" message.
How can i access contacts of android ?
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Jul 9, 2010
When i try that code...
when run program both can't write /read occure
I have set permission to access sdcard what is the problem?
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Sep 14, 2010
How to read and write strings in text file in android which is kept in raw folder and also how to clear contents of that file in android?
I have done this way and my "temp.txt" file is in /raw folder. But i am not getting any output in file. Also I am not getting any error for this...
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Apr 29, 2010
I cannot read and write extended characters (French accented characters, for example) to a text file using the standard InputStreamReader methods shown in the Android API examples. When I read back the file using: the string read is truncated at the extended characters instead of at the end-of-line. The second half of the string then comes on the next line. I'm assuming that I need to persist my data as UTF-8 but I cannot find any examples of that, and I'm new to Java. Can anyone provide me with an example or a link to relevant documentation? Code...
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Mar 25, 2009
I want to know how to get SMS Delivery Report setting which is stored in the /data/data/com.android.mms com.android.mms_preferences.xml. I wrote a application to read it with the following code:
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); boolean requestDeliveryReport = prefs.getBoolean( "pref_key_sms_delivery_reports", true);
Seems it does not work, it always returns the default value which is "true". Does anybody know how to read/write the SMS Delivery Report setting.
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Jan 4, 2010
I m using Android 1.5 my data directory does'nt have the read/write permissions
System.out.println("DAta can write??--->"+Environment.getDataDirectory().canWrite());
System.out.println("DAta can read??--->"+Environment.getDataDirectory().canRead());
So please suggest me how to provide permission for the data directory.
What m trying to do is to create a file and add some content to it iin the Data storage of the emulator like as below
private void writeToSDCard() {
try {
File lroot = Environment.getDataDirectory();
if (lroot.canWrite()){
File lfile = new File(lroot, "samplefile.txt");
FileWriter lfilewriter = new FileWriter(lfile);
BufferedWriter lout = new BufferedWriter(lfilewriter);
lout.write("XXXXXXXXXXXXXXXXXX");
lout.close();
}
} catch (IOException e) {
Log.e(m_cTAG, "Could not write file " + e.getMessage());
}
}
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Jul 18, 2010
There are a lot of different classes that can be used in various ways to read/write to files in Android. For example, you can make use of java.nio.ByteBuffer, FileOutputStream and BufferedOutputStream. Are there any general guidelines for what to use to read/write quickly to the SD card? For example, BufferedOutputStream seems as if it should make things faster but I'm unsure the buffer size should be set for. Specifically, I want to read/write byte arrays that are ~1Mb in size as quickly as I can.
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Feb 24, 2010
I am very new to android and i have wrote an application that reads the Cell ID information , now i want to create a text file and store the information inside , i have googled this issue but i couldn't find a solution that really worked.
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Aug 23, 2010
I don't yet have my shiny new X10, but it should be with me in a few days. In anticipation of its arrival, I wonder whether it is possible to read and write Japanese on the phone? I'd like to add an English-Japanese dictionary, and hope that I'll be able to read the Japanese entries.
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Nov 3, 2010
I am new to Android and relatively new to Java so please bear with me. I have an XML file stored in the res/xml that I am trying to write to. I know how to read it using XmlResourceParser, but I have not been able to find a way to write to that file locally. Could someone point me in the right direction please.
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