Working with Files

oladapo · by **oladapo** » Sat Jan 12, 2008 12:49 am

I have the following error when I try to push a file to the data folder for my project...

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[2008-01-11 18:45:08] Failed to push the items
 
[2008-01-11 18:45:08] null
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What I am trying to do is figure out how I can display a photo taken from the Camera (like the photo in the CameraCapture tutorial). To get started I was going to put a source picture of something I know.

Anyone been successful in this?

plusminus · by **plusminus** » Sat Jan 12, 2008 1:27 am

Hello oladapo,

that was a try from within eclipse, right :?:

Here is :src: your solution.

Regards,
plusminus

sasuke · by **sasuke** » Tue Jan 15, 2008 6:00 am

Hello all,
i got a [font=Courier New]FileNotFoundException[/font] when the program execute this :

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FileOutputStream fOut = openFileOutput("/data/data/dj.android.CustomComponent/files/samplefile.txt", 
 
                                     MODE_WORLD_READABLE);
 
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what's the prob?

Regards,
sasuke

plusminus · by **plusminus** » Tue Jan 15, 2008 11:41 pm

Hello sasuke,

is "dj.android.CustomComponent" the application you are currently developing in / this code is placed :?:

the the following is enough:

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FileOutputStream fOut = openFileOutput("samplefile.txt", MODE_WORLD_READABLE); 
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Regards,
plusminus

sasuke · by **sasuke** » Wed Jan 16, 2008 12:56 am

Hello plusminus,

i used prefix "/data/data/dj.android.CustomComponent/files/samplefile.txt" because i have tested with "samplefile.txt" and it's still not working... :roll:

what's the import? CTRL+SHIFT+O and i got :

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import java.io.FileOutputStream;
 
import java.io.IOException;
 
import java.io.OutputStreamWriter;
 
Parsed in 0.034 seconds,  using GeSHi 1.0.8.4

Regards,
sasuke

plusminus · by **plusminus** » Wed Jan 16, 2008 1:07 am

Hello sasuke,

my original imports are:

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import java.io.FileInputStream;
 
import java.io.FileOutputStream;
 
import java.io.IOException;
 
import java.io.InputStreamReader;
 
import java.io.OutputStreamWriter;
 
import android.app.Activity;
 
import android.os.Bundle;
 
import android.util.Log;
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Perhaps try another filename :!:

Following is the full source. If it still wont work then you perhaps need a -wipe-data (save important data before :!:

)

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package org.anddev.android.workingwithfiles;
 
import java.io.FileInputStream;
 
import java.io.FileOutputStream;
 
import java.io.IOException;
 
import java.io.InputStreamReader;
 
import java.io.OutputStreamWriter;
 
import android.app.Activity;
 
import android.os.Bundle;
 
import android.util.Log;
 
public class WorkingWithFiles extends Activity {
 
    /** Called when the activity is first created. */
 
    @Override
 
    public void onCreate(Bundle icicle) {
 
        super.onCreate(icicle);
 
        setContentView(R.layout.main);
 
        try {           
 
                        final String TESTSTRING = new String("Hello Android"); 
 
                        // ##### Write a file to the disk #####
 
                        /* We have to use the openFileOutput()-method 
 
                         * the ActivityContext provides, to
 
                         * protect your file from others and 
 
                         * This is done for security-reasons. 
 
                         * We chose MODE_WORLD_READABLE, because
 
                         *  we have nothing to hide in our file */              
 
                        FileOutputStream fOut = openFileOutput("samplefile.txt", 
 
                                                                MODE_WORLD_READABLE);
 
                        OutputStreamWriter osw = new OutputStreamWriter(fOut);  
 
                        // Write the string to the file
 
                        osw.write(TESTSTRING);
 
                        /* ensure that everything is 
 
                         * really written out and close */
 
                        osw.flush();
 
                        osw.close();
 
                        // ##### Read the file back in #####
 
                        /* We have to use the openFileInput()-method 
 
                         * the ActivityContext provides. 
 
                         * Again for security reasons with
 
                         * openFileInput(...) */
 
                        FileInputStream fIn = openFileInput("samplefile.txt");
 
                        InputStreamReader isr = new InputStreamReader(fIn);
 
                        /* Prepare a char-Array that will 
 
                         * hold the chars we read back in. */
 
                        char[] inputBuffer = new char[TESTSTRING.length()];
 
                        // Fill the Buffer with data from the file
 
                        isr.read(inputBuffer);
 
                        // Transform the chars to a String
 
                        String readString = new String(inputBuffer);
 
                        // Check if we read back the same chars that we had written out
 
                        boolean isTheSame = TESTSTRING.equals(readString);
 
                        // Celebrate =)
 
                        Log.i("File Reading stuff", "success = " + isTheSame);
 
                } catch (IOException ioe) {
 
                        ioe.printStackTrace();
 
                }
 
    }
 
}
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Regards,
plusminus

sasuke · by **sasuke** » Wed Jan 16, 2008 1:45 am

Hello plusminus,

it's works now.. after added the -wipe-data.

How to create the file not in our apps path (/data/data/package/files/) ?

Because as you say

plusminus wrote:he application runs with application privileges. I.e. the data folder requires system privileges. When you start adb you run as root. But this application runs only with application-privileges

The file browser won't able to retreive the file in 'data' folder.

Regards,
sasuke

cabernet1976 · by **cabernet1976** » Wed Jan 16, 2008 6:12 pm

I met a problem when I want to download a bitmap from web then write to SD card, it is failed, but write to /data/data/... with this tutorial is OK. The following is my code:

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    private void testDownload(String urlStr) {
        URL url = null;
                try {
                        url = new URL(urlStr);
                } catch (MalformedURLException e) {
                        Log.e(TAG, "error1:"+e.toString());
                } 
                
        URLConnection conn = null;
                try {
                        conn = url.openConnection();
                } catch (IOException e) {
                        Log.e(TAG, "error2:"+e.toString());
                }
                
        try {
                        conn.connect();
                } catch (IOException e) {
                        Log.e(TAG, "error2:"+e.toString());
                }
                
        InputStream is = null;
                try {
                        is = conn.getInputStream();
                } catch (IOException e) {
                        Log.e(TAG, "error3:"+e.toString());
                }
                
        BufferedInputStream bis = new BufferedInputStream(is);
        Bitmap bm = BitmapFactory.decodeStream(bis);
        File f = new File("/sdcard/1.jpg");
        
        FileOutputStream fos = null;
                try {
                        fos = new FileOutputStream(f);  // <--error here
                } catch (FileNotFoundException e) {
                        Log.e(TAG, "error4:"+e.toString());
                }
                
        bm.compress(Bitmap.CompressFormat.JPEG, 100, fos);
        
        try {
                        bis.close();
                } catch (IOException e) {
                        Log.e(TAG, "error5:"+e.toString());
                }
                
        try {
                        is.close();
                } catch (IOException e) {
                        Log.e(TAG, "error6:"+e.toString());
                }
    }
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After runing this method with a valid url, I got the error information:
error4:java.io.FileNotFoundException: /sdcard/1.jpg

I am sure the sdcard.img is fine, I can find a dir named "sdcard" in DDMS, and I have added '-sdcard D:sdcard.img' in Emulator.
Could someone help me out?
Thanks.

-----added on Jan 22, 2008-----
Hi plusminus,
I read your reply just now. My code works fine after set the correct configuration of sdcard path.
Thanks.

plusminus · by **plusminus** » Wed Jan 16, 2008 11:38 pm

Hello cabernet1976,

did you give a try to

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FileWriter f = new FileWriter("/sdcard/1.jpg");
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Just try to write some chars to it.

Sorry, but no time for actual testing on my own

(damned exams)

Regards,
plusminus

cabernet1976 · by **cabernet1976** » Thu Jan 17, 2008 2:23 am

Hello plusminus,

Thank you to reply me in your busy time.
I got your meaning, I will try to test whether SD Card is able to be wroten by FileWriter.

Thank you again.

cabernet1976 · by **cabernet1976** » Thu Jan 17, 2008 1:15 pm

I make a big mistake :oops:

The following is my lesson:
1. I created a sdcard, and put the sdcard.img in D:dir1sdcard.img
2. But I configured an invalid information to Eclipse Emulator as: -sdcard D:sdcard.img. It is the origin of this issue.
　I did the above two steps and went to bed the day before yesterday.

3. Yesterday, I opened my Android project, but found there is no 'sdcard' in DDMS file explore, but I didn't think it deeply.
4. I run 'adb push C:test1.jpg /sdcard/test1.jpg', and checked DDMS file explore finding there was a sdcard directory now, and test1.jpg was in it. :roll:

I think it maybe a bug of adb push, it deceive me.

　Now you know the following story, I got FileNotFoundException, and it took me more than one hour.

plusminus · by **plusminus** » Fri Jan 18, 2008 7:06 pm

Hello cabernet1976,

so you are fine now :?:

By pushing that file probably a real folder was created, and not the (pseudo) sd-card.

Regards,
plusminus

tsdt · by **tsdt** » Sat Jan 19, 2008 6:12 am

igal wrote:When I write and read file in the same activity everything is OK.
But when I try to read file from another activity I get "File not found" error.
I do use MODE_WORLD_READABLE option when I write the file, and I do see the file:
"/data/data/com.myname.android/files/JScript.htm"
I use
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FileInputStream fIn = openFileInput("/data/data/com.myname.android/files/JScript.htm")

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statement.
Help, please, to find mistake.
Thanks in advance.

I have the same problem too, Igal !!!.Hic,it takes me one day,but no thing resolved(FileNotFound Exception),even i used openFileInput("fileName"); and used "/data/data/.../files/data.txt".Please help me and Igal,i am in hurry for my demo of a apprentice.

krystox · by **krystox** » Tue Jan 22, 2008 2:50 am

Hi,

Can someone help me with those problems I have?

How can I create a folder and write files into the folder?
For example: I want to create a file like /data/data/myapp/files/folder1/test.txt

I tried to use File class which has a mkdir() method. It can create a folder inside /tmp, but not other places, nor /data/data/myapp/files/

And I also tried to use openFileOutput("folder1/text.txt"), it returns FileNotFound exception as it can't include a file separator.

Anyone has an idea about this?

cabernet1976 · by **cabernet1976** » Tue Jan 22, 2008 9:26 am

Hi krystox,

I met the same issus ( create_directory_failed_in_file_system-t573.html ), I did it according to a thread in google group but failed.
The thread is http://groups.google.com/group/android- ... b5bd03a2cd , it is said that somebody has done it successfully.
Hope you can make it work.

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