Android :: What Permissions Are Needed For Writing To A File Using Activity
Aug 27, 2009
Are any <uses-permission> clauses needed in the manifest for: 1. Writing to a file using the Activity.openFileOutput() mechanism; 2. Writing to the SD card using FileOutputStreams; 3. Sending email using the Activity.startActivity( Intent.create Chooser (...)) mechanism
http://developer.android.com/guide/topics/security/security.html and didn't see anything that seemed relevant. My app works on my ADP1 without any <uses-permission> clauses when installed with "adb install xyz.apk" but I was worried that it may have problems on a "real" consumer device.
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Feb 20, 2013
I didnt have a smartphone for a while and i just got a shining new nexus 4.
I want to installs all the apps out there but i realise many of them require permissions that (i think) are not actually needed by the app to do whatever it needs to do..
For example i want to install power toggles it asks to use my camera... cant the flashlight be turned on without allowing the camera to be used?
Anyways, i realise that apps that sometimes do the exact same things require different permissions, hence... ?
So main question is: is the permission to use the camera really required by an app that turns on the led?
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Jun 2, 2012
I just got the TouchWiz UX launcher installed on my Nexus S 4G, but for some reason I can't place down any Widgets on my home screen. I get greeted with the following message whenever I try:
"Not installed with permissions needed for binding Widgets"
Nexus S 4G using XDA
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Aug 22, 2010
I try to write to a Csv file via:mFileWriter = new FileWriter("/sdcard/program/file");mCsvWriter = new CSVWriter(mFileWriter);At the moment it throws an exception that the file doesn't exist.It's true that the file doesn't exist. What's the easiest way to create the file?
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Jun 14, 2010
I have an activity which starts a (intent)service. Both access the same DB and potentially write to the same table. What design pattern would you recommand to avoid concurrency?
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Oct 27, 2010
I'm trying to read from a file while it still opened for witing.
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Dec 2, 2009
My application stores data locally in the native SQLite db, and I want to allow users to export this data by emailing themself a .csv file. In order to do this I'm generating the .csv from the database and writing it to the SD card, then attaching it to an email:String Builder csv = generateFile();writeFile(csv.toString(),"file.csv");Intent email = new Intent(android.content.Intent.ACTION_SEND);email.setType ("application /octet -stream"); email.putExtra(android.content.Intent. EXTRA_ STREAM, Uri.parse ("file://sdcard/file.csv")); Which all works great. What I'm wondering, though, is if it is possible to skip the step of writing to SD first, and directly attach the data.
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Sep 24, 2009
I tried to create byte array blocks from file whil the process was still using the file for writing. Actually I am storing video into file and I would like to create chunks from the same file while recording. The following method was supposed to read blocks of bytes from file:
private byte[] getBytesFromFile(File file) throws IOException{
InputStream is = new FileInputStream(file);
long length = file.length(); int numRead = 0;
byte[] bytes = new byte[(int)length - mReadOffset];
numRead = is.read(bytes, mReadOffset, bytes.length - mReadOffset);
if(numRead != (bytes.length - mReadOffset)){
throw new IOException("Could not completely read file " + file.getName());
} mReadOffset += numRead; is.close(); return bytes;
}
But the problem is that all array elements are set to 0 and I guess it is because the writing process locks the file. Any other way to create file chunks while writing into file.
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Nov 16, 2009
Can any one give the code to read and write to a file in the Android assets folder.
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Sep 15, 2010
I am trying to download a file from the net and write it to the SD card. I have the WRITE_EXTERNAL_STORAGE permission enabled.
The code fails here:
CODE:..................
I am trying to write the file and it doesn't exists from before.
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Jun 27, 2010
I'm writing a simple budget app for myself, and I'm having trouble figuring out how to write to internal storage. I don't seem to be writing to the file properly and I can't find any more in depth examples than the Data Storage article on developer.android.com. Basically, I'm trying to write a test float to the MyBalance file, then read it into balance. In my actual code I use try/catch statements around the file in/out operations but I skipped them to make the code more readable.
float test = 55; float balance; byte[] buffer = null;
FileOutputStream fos = openFileOutput( "MyBalance", Context.MODE_PRIVATE );
fos.write(Float.floatToRawIntBits(balance));
fis.read(buffer); //null pointer
ByteBuffer b = ByteBuffer.wrap(buffer);
balance=b.getFloat();
That's the gist of it, anyone see what I'm doing wrong? I went ahead and converted to/from String but I still don't think the file is being created. I have an if statement that reads from it if it exists in onResume() and it isn't being run. Lemme post some of my code. Here's how I'm writing the file, (setbal is an EditText and balanceview is a TextView):
balance = Float.valueOf(setbal.getText().toString());
balanceview.setText(setbal.getText());
balstring = String.valueOf(balance);
for (int i = 0; i < balstring.length(); ++i)
try { fos.write((byte)balstring.charAt(i));
} catch (IOException e) { e.printStackTrace();
}
I check if the file exists in onResume() like so:
File file = new File("data/data/com.v1nsai.mibudget/balance.txt");
Is that where an internal file for that context would be stored?
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Nov 9, 2010
I am developing an application that read data from sensors and write those data to an XML file when you press a key. i have 2 activity one for button and another is an Activity who implements sensorEventListener. the problem is my main activity is button and couldn't get data from event listener activity. i think the listener activity is not active but when i create an intent and start activity with that intent the program stop working. the button is able to create XML file solely.so how could i read sensor data from sensors,and how to send them to XML file when the button got clicks.
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Jan 5, 2010
I know that Android provides some useful methods to be overridden in order to define a menu:
CODE:..............................
I would like to have this menu shared by each Activity and ListActivity of my Android application. This is for having a standard menu in each (List) Activity that lets the user jump to every part of the application within a click.
Right now, the easiest way to achieve this is to copy-and-paste both methods in every (List) Activity of the application. I don't like this redundancy of code written.
Is sub-classing a reasonable choice? I've already seen that sub-classing one of my ListActivity does not work very well (threads that retrieve objects from a database are giving problems). Are there other ways to share a menu though Activities?
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Mar 31, 2010
In my application I will be writing messages to a text file. When I am writing the messages I also want to include the time in it. How do i write in the current date and time? Must I use Calendar now = Calendar.getInstance()?
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Aug 24, 2013
I have an app that is working, all is cool. Now, it has textview object, and I would like to save that content to *.txt file, in a "simple" way (not for me obviously). I have a simple button, and by clicking it I would like to save *.txt file to SD card, (root of the card is ok).
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Nov 24, 2010
I rooted my Droid Continuum with z4Root and it worked perfectly. I am wondering if there is a way to change the file permissions of my internal files so that I can do some of my own changes? Is there any app that will allow this or something? Will BusyBox do this for me??
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Jun 7, 2010
"Unable to save file to SD card due to insufficient file permissions."
This is the message I get when I try to take pictures. I have only taken 9 shots so far. There was no problem until yesterday when i tried to take the tenth. Did I do something to cause this? I am not that tech smart
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Apr 7, 2013
so I'm trying to write in "Update-Binary" in a Zip File .
In The Zip The Update-Binary is Located : META-INF < COM < GOOGLE < ANDROID < (Here)
I'm trying to write and edit some things into the file , which I have tried with NotePad++ and Notepad and WordPad . None will work ... When I go to Flash I have a Error right away since The Update binary is the system to start the Flash it won't work .
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Jul 3, 2010
I was wondering, is there anyway a developer can hide or exclude a certain app permissions from being seen by Android market users? And are the permissions for an app controlled or regulated by Google? Another question I have - Is there anyway to restrict PDF files from opening in the default browser? This is a problem when I am on a search engine and accidentally click a link that's a pdf file- I don't want pdf's downloaded without asking me permission atleast. And my last question, is there a way to view current extensions that are installed in the browser.? Where is androids inbuilt file manager? Does uninstalling an application completely take off everything related to that app from your phone?
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Aug 1, 2010
Is there any app that will let me see the file permissions and change them so I can remove some stock apps? I'm rooted and on xtrROM 3.03.
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Nov 24, 2010
I'm an android noob that is looking for some advice on how to properly use a service in Android. I am building an app that will connect to a server on the Internet to get a data stream via TCP. That data then needs to get send out to another device that is connected via a bluetooth serial port. I want this to continue to function in the background while the user looks at a different activity. The app will be a NTRIP client, which pulls real time RTK correction data from the Internet and sends it to a RTK GPS receiver that I connect to via bluetooth. The data rate will be about 500 bytes/second. The user interface is a single button to connect or disconnect the data stream and some text to show status of the GPS receiver. There are also a few settings that will need to be configured by the user such as the IP/port of the server to connect to and the bluetooth device to communicate with.I think I need to have the main activity spawn a local service, and then have the service spawn a thread for the TCP stream and another thread for the bluetooth connection. Does this sound right? What is the best model for the service in this scenario?-Start(bind) the service every time the activity starts, and have the connect/disconnect button send commands to the service to start/stop the threads. If I go this route, the service will continue to run after the user disconnects and goes to another app. The service would need an inactivity timer to terminate itself.-Start and stop the service when the user presses the connect/disconnect button. The service only runs when data is moving. If I do this, the activity will need to see if the service is running when the activity starts, in order to know if it should bind to the service or tell the user that the link is disconnected.
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Sep 10, 2010
That allows me to delete files, change file/folder permissions on a remote ftp server.
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Dec 6, 2009
Marketplace thinks I have this application installed, but won't let me uninstall it. Rumor is that re-installing the APK file will fix it, but there is none to be had on the web. Anyone have the APK file for dolphin? It needs to be 1.2.99 (or later) because the package name was changed in that version.
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Aug 17, 2010
I'm calling Debug.startMethodTracing("fnord") and I'm getting a java.lang.RuntimeException: file open failed message. It looks like I'm supposed to have the android.permission.WRITE_EXTERNAL_STORAGE permission set. But how do you set that permission when you're debugging through Eclipse? Aren't permissions normally set at install time (which doesn't happen in a normal way when you're debugging)?
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May 4, 2010
Understanding Android file permissions
CODE:.....
To Check Permission at anytime in ADB just Type:
CODE:.......
The next 9 characters define the file permissions. These permissions are given in groups of 3 each.
The first 3 characters are the permissions for the owner of the file or directory.
Example = -rwx------
The next 3 are permissions for the group that the file is owned by.
Example = ----rwx---
The final 3 characters define the access permissions for everyone not part of the group.
Example = -------rwx
There are 3 possible attributes that make up file access permissions.
r - Read permission. Whether the file may be read. In the case of a directory, this would mean the ability to list the contents of the directory.
w - Write permission. Whether the file may be written to or modified. For a directory, this defines whether you can make any changes to the contents of the directory. If write permission is not set then you will not be able to delete, rename or create a file.
x - Execute permission. Whether the file may be executed. In the case of a directory, this attribute decides whether you have permission to enter, run a search through that directory or execute some program from that directory
In addition to the file permission, you can also modify the owner and group of the file. The chown program is used here and its syntax is very simple. You need to be the owner of a file or root to do this.
Understanding Owner Permissions:
The first command is for owner ID, the Second Command is for Group ID.
exp. root.root ( First Root is owner, Second Root is Group ).
Chmod 644 some file, Like Build.prop For testing & then Veiw the Resulted Changes!
Refer to the table below as a quick reference.
Command Line for Both would look like this
CODE:.....
I'll update the chmod with more with More Complex Commands Later
Side Note:Always set owner ( chown ) before Setting Permissions
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Feb 2, 2012
I am trying to sync a rostering app between two devices using dropsync. The .db files that need syncing are in the /data/ data/com/databases directory. Using Root explorer I can change the permissions to give full rw permission to others. The two .db files will then upload to the dropsync server.The problem is that whenever the app is opened and anything modified, the permissions change back to default and thus dropsync can't access the modified .db... Is there anyway to change this or am I wasting my time? what is the 'sticky' box option in RE?
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Jun 18, 2013
I am trying to make my first custom ROM, but I have a problem with permissions.. this is my updater-script:
Code:
ui_print(" ");
ui_print("________________________________");
ui_print(" MADE BY FECHE ");
[Code]..
But when I press on reboot on recovery, it says that the ROOT may have been lost, then it says, repair root? I press on 'no', the device restarts but it gets a black screen right after the device logo..
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Jan 31, 2014
how to find permissions a given application has. Each app is run as a certain user, so wouldn't finding the file permissions of an app be the same as finding the file permissions of a user? On Linux/Unix there is the find command but I don't know of any alternative command that is available on android. I am running KitKat 4.4.2 kernal 3.40-gadb2201.
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Jul 21, 2013
I can't copy the file 'hosts' back to system/etc. after I cut it out of the folder a couple mins ago. When I use ES File Explorer (don't wanna pay 4euros for Root Explorer..) to try and paste it back (with everything set to RW and having root permissions) it says 'permission denied'. I don't know what I'm doing wrong..
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Nov 14, 2010
Specifically, when I go to /mnt/sdcard/download all the files are ---rwxr-x. When I long-click a file I can access a Permissions dialog, but any changes I make there are not actually reflected on the file system. Anyone know what might be going on?
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