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?
View 1 Replies
I'm trying to read from a file while it still opened for witing.
View 2 Replies View RelatedMy 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 RelatedI 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.
Can any one give the code to read and write to a file in the Android assets folder.
View 3 Replies View RelatedI 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.
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.
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?
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.
View 1 Replies View RelatedIn 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 RelatedI 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 Relatedso 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 .
I'm Trying to Write Logs to Custom Log.txt File on Android File using this code of Mine but then this method creates file but contains nothing. Basically I want to read previous contents of the file and then append my data with the existing content. The Code is as follows :
public static void write(String str)
InputStream fileInputStream = null;
FileOutputStream fileOutpurStream = null;
try { FileInputStream = new FileInputStream(file);
fileOutpurStream = new FileOutputStream(file);
if(file.exists())
{int ch = 0;
int current = 0;
StringBuffer buffer = new StringBuffer();
while((ch = fileInputStream.read()) != -1)
{buffer.append((char) ch);
current++;
}byte data[]=new byte[(int)file.length()];
fileInputStream.read(data);
fileOutpurStream.write(data);
fileOutpurStream.write(str.getBytes(),0,str.getBytes().length);
fileOutpurStream.flush();
} else
{file.createNewFile();
fileOutpurStream.write(str.getBytes(),0,str.getBytes().length);
fileOutpurStream.flush();
}catch(Exception e)
{e.printStackTrace();
}finally
{try
{fileInputStream.close();
fileOutpurStream.flush();
fileOutpurStream.close();
fileOutpurStream = null;
fileInputStream = null;
}catch (IOException e)
{// TODO Auto-generated catch block
e.printStackTrace();}}
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.
I am using django + twisted for the backend.
Basically, I am going to be writing RestfulAPIs to open up for the clients on both phones to call.
Now the real question is, how should I come up with an authentication system?
I have thought about using sessionids, this works very well with the browser and I can use django's integrated app for that.
However, I don't know if it's possible for both the iphone and android to obtain a unique sessionid on the handset. Should I write an API call to distribute unique sessionids?
if that's the case, is it possible for me to still use django's authentication system since a lot of the stuff here are customized? ( I am not even using a rdbms - I am sticking with mongodb, so I was on the verge of dropping django's authentication app ftm).
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.
This is a pretty open ended question.I have a T-Mobile Touch and have some free time on my hands. So far as i understand im stuck with Android 1.5 and no sign of T-Mobile or Huawei releasing a ROM using a more up-to-date version of the Android SDK.Im asking what are the major complexities involved with making a ROM for this fone using a newer version of the Android SDK?
View 1 Replies View RelatedI would like to open an mp3 file with my own audio player(based on mplayer and FFmpeg) I packaged in a apk file. It runs fine using command line and the executable version but not when packaged in apk. I got the messages using adb logcat window:
I/stdout ( 2115): PCM: Samplerate: 48000Hz Channels: Stereo Format s16le I/stdout ( 2115): [AO PCM] Info: Faster dumping is achieved with -vc null -vo null -ao pcm:fast I/stdout ( 2115): [AO PCM] Info: To write WAVE files use -ao pcm:waveheader (default). I/stderr ( 2115): [AO PCM] Failed to open /dev/msm_pcm_out for writing! I/stderr ( 2115): Failed to initialize audio driver 'pcm:file=/dev/ msm_pcm_out' I/stderr ( 2115): Could not open/initialize audio device -> no sound. I/stdout ( 2115): Audio: no sound I/stdout ( 2115): Video: no video I/stdout ( 2115): Exiting... (End of file)
I put the permission in the manifest file as follows:
code:...............
I want to edit image for Writing text on images, is it possible in Android, if so, how to achieve this.
View 3 Replies View RelatedDoes anyone have any suggestions on where to start in case one wants to write a firewall for Android? I am interested especially in how would one go about in blocking access for various applications that are blacklisted from a firewall application. As far as I could find, there are no firewall applications in the real sense except Droidwall which uses iptables on rooted phones, but I would like to see if there are any API calls currently in Android that may help with this task, be it NDK or SDK.
View 3 Replies View RelatedI'm looking for a way to programmatically save an array of shorts as PCM data. I know that this should be possible, but I haven't found a very easy way to do this on Android.Essentially, I'm taking voltage data, and I want to save it in PCM format. My function looks something like this:public void audifySignal(short[] signal) {// Create a WAV file from the incoming signal}Any suggestions would be awesome, or even references. Seems like the audio APIs built in to android are more geared for directly recording from the mic, and not so much for lower level signal processing type work (at least for saving raw data to a file). I'd also like to avoid having to manually write the PCM file headers and what not.
When implementing download function it work but during file saving to sdcard i get the following Default buffer size used in BufferedInputStream constructor. It would be better to be explicit if an 8k buffer is required.Also IO Exception occure
W(14495:0x389f) java.io.FileNotFoundException: /sdcard
W(14495:0x389f) at org.apache.harmony.luni.platform.OSFileSystem.open(OSFileSystem.java:244)
W(14495:0x389f) at java.io.FileOutputStream.(FileOutputStream.java:97)
W(14495:0x389f) at java.io.FileOutputStream.(FileOutputStream.java:168)
W(14495:0x389f) at java.io.FileOutputStream.(FileOutputStream.java:147)
I have a game object that I save like this in OnPause()try {final ObjectOutputStream os = new ObjectOutputStream(openFileOutput(gameName + ".sav", 0)); os.writeObject(gameObject); os.reset();} catch (final Exception e) {e.printStackTrace();This works fine except on some of the older or slower phones it can sometimes take too long to complete. I end up getting a ANR (Activity Not Responding) error. I would like to move this to a thread to prevent blocking the UI. However when I try this I run into multiple problems.First openFileOutput is only available in my activity. I worked around this by passing the ObjectOutputStream to the thread. After that I could save the object but later when I tried to reload I get a java.io.EOF Exeception. does anyone have a good pattern for writing objects to a file from a thread?
View 1 Replies View RelatedIs there any way of accessing the internal SD card on Android devices that have internal flash, internal SD and external SD cards?
View 1 Replies View Relatedi have a small issue i can't figure out.For my program, i basically want to execute some code if the user hasn't done anything with the application for 5 minutes (say log out).how can i go about doing this? i'm lost on detecting that the user has done nothing, and then reset the count once the user has touched the tablet or something. can somebody give me some pointers?
View 1 Replies View RelatedI'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.
I am writing a custom button.
In the android button, I can customize my button like this:
CODE:......
And in the Button.java source code, it gets the value like that: In TextView.java:
CODE:......
My question is if I need to add a new value in the customization for my button.
CODE:....
How can I get 'myattribute' in my class for my custom button?
I am writing an application that will create a textfile in the /sdcard or /data directory and write messages to the textfile.Each time I want to append the messages and not overwrite the file.
View 7 Replies View RelatedI'm in the process of extending monkey for software testing purposes, so I would like to replace the current monkey.jar which my own compiled monkey.jar in the emulator. The current monkey.jar is
located at /system/framework/monkey.jar.
When I try to run the following command:
adb push monkey.jar /system/framework/monkey.jar
I get the following:
'failed to copy 'monkey.jar' to '/system/framework/monkey.jar': Out of
memory'
How to replace the current monkey.jar?
This actually works if I'm running Android 1.6 in the Emulator, but nothing after that.
Yes, i've tried 'abd remount'
This is not a .jar specific issue. I can't push any type of file to /system/framework
I'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 RelatedI have created an edit text. Currently the writing keypad is made visible when i click on it. Is there a possibility where I can make the writing keypad visible from starting itself i.e. no need to click on the edit text view.
View 5 Replies View RelatedI'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 Related