Android :: Saving ArrayList To Txt File / Data Folder Empty
Apr 25, 2010
I am trying to save an arraylist to a .txt file below is the code I am using, which runs without error but when I try to go to Astro file manager and browse the data folder there is nothing there.
String filename = stationname.getText().toString() + System.currentTimeMillis();
FileOutputStream fos = openFileOutput(filename,Context.MODE_PRIVATE);
ObjectOutputStream out = new ObjectOutputStream(fos);
out.writeObject(report);
Report is the ArrayList that holds each of my station Reports.
out.close();
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Oct 25, 2011
how do i save the text file from a website to the raw folder. did some research but cant seem to find the solution to it.
Code:
package com.exercise.AndroidInternetTxt;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
[code]...
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Aug 26, 2010
If I create a new arraylist of size 5...
And then I try to add to the middle of that arraylist...orderedPlayers.add(2, P);
I get an indexoutofbounds...I also get indexoutofbounds if I use set instead of add...orderedPlayers.set(2, P);
In fact the only way I can add P to the arraylist is if I use the 0 index...orderedPlayers.add(0, P);
And also for some strange reason when I do that my debugger in eclipse sees that element added to the 4th index of orderedPlayers instead of the 0th... is ArrayList buggy or am I completely missing something? how would I add to the middle of a null ArrayList?
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Aug 12, 2010
I have a member variable in my Activity which is an ArrayList. The objects populating this Array List are objects I have defined called Rating Item. Rating Item has several member vars like rating, comment, ID, etc. I would like to save this Array List in onSaveInstanceState so it can be repopulated from onRestoreInstanceState. What is the best way to do this? I've never saved the state of an object of this complexity.
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Aug 10, 2010
I am working on an application where I am saving the state of an application in an ArrayList. Now, to save this state, I tried to use Serialization. But, somewhere in the user defined object, I am using Button, which is not letting me serialize the entire object. I wanted to know, is there any other way of saving this array list between onPause and onResume? I even tried onSaveInstanceState, but it doesn't have support for Array List.
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Jul 9, 2010
I'm working on a android application that will display Strings to the user, and the user then has the option to add one to a favorite list. I have searched and searched and cannot find the proper way of doing this. I did get one open source project, everything worked until the user removed a favorite. The database would clear the row of data, but when a new row is added, it would behave as if the deleted row still had data, leaving blanks in the favorite list.
This is my insert method
public long insertString(String newString)
ContentValues newStringValue = new ContentValues();
newStringValue.put(KEY_STRING, newString);
return db.insert(DATABASE_TABLE, null, newStringValue);
The long returned will always increment even if i use the remove method:
public boolean removeString(long _rowIndex)
return db.delete(DATABASE_TABLE, KEY_ID + "=" + _rowIndex, null) > 0;
If I try to remove the third index, and the user removed a question at the third index, the method returns false, is there a way to completely remove all rows with no data?
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Dec 4, 2012
I'm writing a game using Surfaceview and have a question relating to saving Data into a Bundle.
Initially, I had an arraylist which stored the Y co-ordinates (in the form of Integers) of sprites that will move only up and down. Declared as:
Quote:
static ArrayList<Integer> ycoordinates = new ArrayList<Integer>();
I saved them to a Bundle using the following:
Quote:
myBundle.putIntegerArrayList("myycoordinates", ycoordinates);
And restored them using this:
Quote:
ycoordinates.addAll(savedState.getIntegerArrayList ("ycoordinates"));
This all worked perfectly. However, I've had to change the whole coordinates system so it's based on Delta time to allow my sprites to move at a uniform speed across different screens. This is, again, working perfectly.
However, as a result of this change, I now have to store these values as floats rather than integers.
So, I am declaring as:
Quote:
static ArrayList<Float> ycoordinates = new ArrayList<Float>();
So that's the background, now my question is, how do I store and restore values from a Float Arraylist? There doesn't seem to be a "putFloatArrayList" or "getFloatArrayList".
(I've used an Arraylist rather than an Array as the number of sprites needs to be dynamic).
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Jul 15, 2010
I have my Nexus One connected with the USB.When I visit the File Explorer of the DDMS, if I click on the "data" folder the little plus near the name "data" disappear for 2-6 seconds and then reappear but the contenct of the folder "data" is not showed!
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Jun 29, 2010
I've been working with SQLite on android and I would like to add an arraylist to a column in a table, and then fetch the data back as an arraylist. The arraylist is a list of Longs. I've noticed that SQL has an option for storing BLOBS, however, it looks like I need to convert the array list to a byte[] first before being able to store it as a blob in my SQLite database. Is there any other option for saving my array of data, I should consider?
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Mar 5, 2009
Man, this application is so awesome....... simple but what a great way to study. Anyway, does anyone know if the flashcards are stored on the sdcard or the phone? I found a folder on the sdcard named studydroid, but using Astro it looks like the folder is empty.
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May 25, 2013
Galaxy S2 / Cyanogenmod 10.1 RC2
Browsing into
Android > data > com.snapchat.android > cache > EMPTY
Tried using file manager app to browse through the files, then used TWRP file manager to browse files, both resulting in empty cache folders.
Snapchat notifications - 5 unread messages - stage: "press and hold to view" - so snapchats are already loaded onto phone?
Also, completely irrelevant, but I'm using a USB mass storage app to try to use mass storage instead of MTP/PTP but when hooked up onto computer, removable disks are grayed out.
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Jun 4, 2010
Is it me or is there no way to empty the trash folder with one click? How is this possible with the level of technology? How could it get through UAT without this feature?
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Apr 6, 2014
I send data to my mysql database the posted data is empty...I don't know what is wrong with my code.
[HIGH]urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("POST");
urlConnection.setDoOutput(true);
urlConnection.setChunkedStreamingMode(0);
OutputStream out = new BufferedOutputStream(urlConnection.getOutputStream ());
[Code]...
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Nov 12, 2009
Is there a way? I couldn't find any for either gmail or my POP3 account.
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Jan 9, 2010
I bought the SNES emulator from market on my moto Droid. I then went to romhustler and downloaded 3 games. I made a folder for them and put them on my phone. I then pull up the snes emu the hit load rom, then clicked on the folder with my 3 downloaded games in it and it says folder empty. what am I doing wrong? I went to astrofile thingy and hit the zipped files to extract but when it hit extract nothing happens. Can anyone help me out?
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Jun 10, 2010
I'm having an issue that I can't figure out...
I'm using HTC Email on my EVO and my Trash folder is showing completely empty on the phone, no matter what download options I set (xx messages, xx days, ALL). I know the Trash folder is not truly empty because my regular PC mail program shows over 9000 messages.
- my email is setup as an IMAP account through 1and1.com
- the Trash folder is the only one that is not showing any emails when it should be
- I have checked to make sure there's not an alternate Trash Emails, Garbage, Recycle Bin, etc folder that is being used for deleted emails on my email account
- this same behavior is being exhibited when I setup my email account on an HTC Hero
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Jul 14, 2010
I have developed a simple application that on certain events sends an SMS to ppl from my address book. All works perfectly Except there is no trace of the SMS sent. I know that the SMS gets delivered - I have tested it but eventually I would like to have a trace of what was sent. I have tried giving write permission but it didn't help. Is there something special I have to do?
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Apr 7, 2010
I wish to display data in the the arraylist in a list view. The arraylist is not a generic list but a object defined by me. I want to display only certain data of the object. Something like, an object of a student, I want to display the student's name only, the student id and the student dob is not required.
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Jul 1, 2010
I am using the Android onTouchEvent to register touch and the associated movement. I then want to iterate a sprite along that path.
I need to store the path traced by the finger for use later on.
The problem is that after the finger is lifted off the screen the ArrayList (pArray) is completely populated with the X & Y position of the ACTION_UP coordinates.
From the Log i can see that it is adding the current X & Y position to the Arraylist while the finger is moving which is great but then the Arraylist gets overwritten by the data in Arraylist.size() - 1...
CODE:.....................
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Jul 6, 2010
I have a problem with listView, I used ArrayList to store data, and a customized Adapter. But, when I remove all the data, and add one item again, it does not display anything in this list. What happens to my List, can anyone help me?
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Jul 23, 2009
I have a problem with creating a trace file containing logs on my app. I use Debug.startMethodTracing("tracing"); and in my onDestroy() method i stop the methodTracing. Everything is going fine, like my file is created on my phone BUT it is empty, and i don't get why because it worked once and since i can't get it working. Here is the log ive got, and it says that it is writting on the file, so this is acting a bit weird. Code...
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Jun 9, 2012
I am working on android app where user fill application form in which he has to feel entries like user name, Roll No, Location etc.I have given two button prev and next....Now i want to do When user filled up the form and clicked on next button he will navigate to next page and when he clicked on prev button he will get same information that he was filled before i.e. user name, Roll No, Location.
I have used arraylist to store values that supposed to captured in form..EX. Button A= Name, Button B= RollNo, Button C= Location for 'n' no of times i.e. if i entered 10 such records and clicked previus button 2 times then it suppose to show that values only....
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Nov 27, 2012
When I receive an email with attachment, gmail gives me three options, one is to save them. I would like to know if i press save, in which folder do they get saved so that i can then view them or use the files to send/upload somewhere else?
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Jun 14, 2010
I took a bunch of photos this weekend and they are sitting in the camera folder in the gallery. How do I save them to the phone?
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Sep 22, 2010
For some reason the empty view (TextView in this case) always appears, even when the List is not empty. I thought the ListView would automatically detect when to show the empty view.How can I hook up the empty view properly?
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Sep 8, 2012
First there is this:
Code:
File wave1 = new File(wavFile1);
if(!wave1.exists())
throw new Exception(wave1.getPath() + " - File Not Found");
[Code]...
but android dosen't support java.sound.sampled
there is also this:
Code:
private void merge2WavFiles(String wavFile1, String wavFile2, String newWavFilePath) {
long RECORDER_SAMPLERATE = 44100;
long RECORDER_BPP = 16;
[Code]...
but is also dosen't work.
In all cases the result sound file is empty without sound.
How can I merge two *.wav files?
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Mar 23, 2009
I would be an intermediate level Java programmer (more of a hobbyist). I want to create an app for android that counts stats during a football game. This is roughly the functionality:
1.User presses buttons representing each type of stat e.g. #1 for score, #2 for lost possession of ball etc. (ideally it would be on a touchscreen phone and the user could use a stylus to touch buttons on the screen -by the way, would I have to program differently for a touchscreen? or is that a hardware thing?)
2. Each time a number is pressed, it's written to a text file on the phone or into a database (sqllite or whatever).
3. The text file can then be sent in a message to another android enabled phone.
Is it possible to test the existence of this text file on the android emulator? Is all this possible without being an advance Java programmer? Any guidance would be welcome and I realize this is a broad definition of the program.
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Apr 30, 2009
I 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){
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Nov 12, 2012
I have the galaxy nexus and am thinking about changing to the new nexus 4. How can I save app data progress that I do not want to lose. It needs to be a simple process. I heard my backup pro works.
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Apr 6, 2010
I just recently bought a Motorola Droid, and I was pretty shocked at how quickly the battery ran out of juice. I looked around on the net and found a tip that said to turn off the Background Data option, so I did that, but I find this to be a very convenient feature. I'm just wondering if there's some sort of app or widget that will let me quickly toggle the Background Data option on and off for a quick sync to push all of my stuff in whenever I want it.
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