Android :: Writing - Reading From A File Simultaneous
Oct 27, 2010I'm trying to read from a file while it still opened for witing.
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Android :: Reading And Writing To File In Internal Storage
Jun 27, 2010I'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?
Android :: How To Do EXIF Reading And Writing
Jun 17, 2009I've been looking around on the net and in this group, but i have not found any java package that can read and write EXIF data.
I tried Sanselan. They say they don't use ImageIO/AWT, but they actually do use AWT. The class can not be loaded because there is an AWT dependency:
CODE:......
What i want is not so much creating my own EXIF data, but preserving a JPEG's meta-data (EXIF). I'm planning to load a JPEG, edit its bitmap and write it out again to a(nother) JPEG with the same meta-data as its original.
Android :: Serial Ports Reading / Writing?
Aug 16, 2010I've had an inquiry about whether my Android app can interface with a serial device via USB cable. Before I invest too much time in this path, I'd like to know: Is this even possible? Some previous threads indicate Android won't do host USB. Would it require root access and/or the NDK? Would it be better to advise the potential client to look for a serial blue tooth adapter? I can see that there is a Blue tooth Sock class which may do the job.
View 4 Replies View RelatedAndroid :: Reading / Writing Data To Serve
Jun 19, 2010I'm writing an app that will periodically send information out to a remote server, and then get relevant information about other users from that server back to the local database.What's the best way to handle sending out this info (i.e.: XML or binary) and writing it to the remote server.Also,how can I assure that, when 500+ users' data get's to the server or FTP (or better alternative?) at once, the appropriate fields gets overwritten or added, without skipping any or overwriting the entire thing?
View 1 Replies View RelatedAndroid :: Public Calendar API For Reading / Writing Event Data?
Jan 7, 2010Is someone from Google able to advise when the Android SDK is likely to include a public API for reading/writing event data to the user's calendar? Searching the forums I see that this is a much desired feature by many developers but I haven't seen any indication as to when (or even if) this need will be addressed.
View 1 Replies View RelatedAndroid :: Download Here Library For Reading - Writing EXIF From Your JPEG Images
Jul 23, 2009Android does not provide an Exif Reader or Exif Writer in its SDK (it has a native implemenation, though, but that API is private).
The Sanselan library, however, does provide a full fledged set of functionality for reading and writing Exif metadata.
However, Sanselan pur sang cannot be included in an Android Project. It references classes and packages that do not exist under the current version of Android (e.g. ImageIO).
Therefore, I made a quick cut of Sanselan 0.97, cutting out all the classes that prevent it from being used on the Android platform. It is a quick cut and it may have some issues. However, I got its exif reading and writing to work for my application and it looks like its working quite well. Reading and writing raw image-data is, however, not possible in this cut. This has been cut out.
Android :: Writing To CSV File Via OpenCsv
Aug 22, 2010I 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?
View 1 Replies View RelatedAndroid :: Possible To Attach File To Email Without Writing To SD?
Dec 2, 2009My 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.
View 1 Replies View RelatedAndroid :: How To Split File Into Chunks While Writing Into It?
Sep 24, 2009I 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.
Android :: Writing To File Assets Folder
Nov 16, 2009Can any one give the code to read and write to a file in the Android assets folder.
View 3 Replies View RelatedAndroid :: FileNotFoundException - Writing A File To SD Card
Sep 15, 2010I 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.
Android :: Reading Package Name From Apk File
Aug 12, 2009If i have a apk file and want to know the package name and class hierarchy, how do i do it?
Suppose I have some sample APK file named "SampApp.apk" which contains classes inside "com.android.sampApp".
Is there any tool in Android SDK which shows the package name when APK file is passed as a parameter.
As the Class files are compressed to dex file I am not able to check the actual package name.
Android :: What Permissions Are Needed For Writing To A File Using Activity
Aug 27, 2009Are 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.
Motorola :: Writing Android Sensor Data To XML File
Nov 9, 2010I 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.
View 1 Replies View RelatedAndroid :: Where To Put File When Reading From SD Card (Development)
Oct 19, 2010If I am going to be reading files from the SD Card, where do I put them during development? Also, when I install the app, will it include these files and put them to the SD Card?
View 1 Replies View RelatedAndroid :: Reading Specific File From SD Card
Sep 23, 2010How to read a specific file from sd card. I have pushed the file in sd card through DDMS and I am trying to read it though this way but this give me exception. Can anybody tell me how to point exactly on that file? My code is this.
String path = Environment.getExternalStorageDirectory().getAbsolutePath();
FileInputStream iStream = new FileInputStream(path);
Android :: JAudioTagger - Reading Mp3 File - VerifyError
Aug 27, 2010I have the following error but cannot workout the problem, i am READING MP3 files and the below error seems to come as it tries to WRITE MP4 files.
CODE:.......
Error comes after calling the above and passing the first MP3 file
CODE:.....................
Android :: Writing Current Time In Messages To Text File
Mar 31, 2010In 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()?
View 4 Replies View RelatedWriting TXT File To SD Card
Aug 24, 2013I 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).
View 1 Replies View RelatedAndroid :: Java.lang.ExceptionInInitializerError While Reading Yml File
Jun 16, 2009I am getting java.lang.ExceptionInInitializerError while reading yml file.The code that i am using for reading yml file is InputStream inputdatfile=Myclass.this.getResources().openRawResource (R.raw.datafile); Map<String, List<Map>> data = (Map<String, List<Map>>)Yaml.load (inputdatfile); I am getting the error in the second line.My yml file is in res aw folder. the external jar file i am using here to read yml file is jyaml1.3.jar. i tried to add <uses-library android:name="org.ho.yml" / > in manifest file that time i am not able to install the app in
View 5 Replies View RelatedAndroid :: Draw Arabic Text After Reading From File?
Sep 26, 2010I've figured out how to draw Arabic characters properly (connected and right to left) using string literals like this:
textView.setTypeFace(Typeface.createFromAssets(getAssets(),"DejaVuSans.ttf"));
textView.setText("uFEB3uFE92uFE98uFE94");
But for some reason I cannot get the arabic to format properly if I read anything from a file using InputStreams like this:.....................
Android :: Reading Defining Line Of Text File In Java
Oct 2, 2010I am trying to develop application for android . how I can get the defining line of textfile? For instance I have to read 15. line of textfile. how I can do that?
View 1 Replies View RelatedAndroid :: Reading Binary File From Sdcard Using Stream Classes
Oct 5, 2010Can anybody have any idea how to read a binary file which resides in sdcard using Streams, like Inputstream, CountingInputStream or SwappedDataInputStream?I am using these three streams to read a file which is currently in the Resouces folder, but now i want to move that file in sdcard but I cannot change these stream because I have done so much work on it and I cannot roll back my work.i am doing it this way but its giving me FileNotFoundException.
View 1 Replies View RelatedGeneral :: Writing Update Binary In Zip File
Apr 7, 2013so 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 .
Android :: Need Code For Reading Pdf File In Droid To Build App Like RepliGo Reader
Aug 26, 2010How to code for reading a pdf file in android? i want to build an app like RepliGo reader. So, Please enlighten me to read pdf by using android sdk or ndk.
View 1 Replies View RelatedAndroid :: Drawable Changes Sizes On Screen When Reading Image From File / Avoid This?
Apr 15, 2010I have an image on a private file.
I read the file, create the drawable, and assign it to an ImageView.
The ImageView has WRAP_CONTENT so the size is automatic.
On 320x480 screens, the image looks good
But on screens with more resolution and high density 480x800 or 480x854 (N1, droid) , when the image is for example 150x150, I see the image as 100x100.
Of course it has something to do with the density but not sure how should I resolve this.
This is my code...
if I then inspect the size of the icon, android thinks the size is 100x100, when really is 150x150.
Looks like its reducing the image by the density.
Can anybody explain this and how to avoid this.
Android :: Remove Html Tags While Reading Data From XML File Using Droid?
Jul 20, 2010I am newly working on Android technology. I have to read Xml file in which there are html tags such as <b>() so I have to remove these tags before display on screen. If you know any way to remove these before display.
View 1 Replies View RelatedAndroid : Reading File Of Provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI
Mar 2, 2009I got FileNotFoundException when run this
FileInputStream fileToRead = new FileInputStream(fileName);
here fileName is a string =content://media/external/images/media/6 which is got in sdcard image selection by android.provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI
any solution?
HTC Incredible :: New SD Card Transfer File / Data Reading Off
Jul 23, 2010I searched the Incredible forums and sub forums and could not find an answer to this question, though I am sure it has been asked: If I want to go from my stock 2 GB card to a new card, and I want to preserve data AND have all apps still be able to read whatever data they were reading off the card, do I just transfer the files from one card to the other? I bet the only thing I need to make sure of is that new card is formatted with the same file system as the original card, right? I know copying data from one card to the other will preserve data, but I want to make sure I have no problems with apps, either, after inserting the newer card.
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