I have a problem writing to the SD card, here is the code:
(Sorry about the layout of the code, just copy pased it )
public class SaveAndReadManager {
private String result;
private String saveFileName = "eventlist_savefile";
public String writeToFile( ArrayList<Event> arrlEvents ){
FileOutputStream fos = null;
ObjectOutputStream out = null;
try{
File root = Environment.getExternalStorageDirectory();
if( root.canWrite() ){
fos = new FileOutputStream( saveFileName );
out = new ObjectOutputStream( fos );
out.writeObject( arrlEvents );
result = "File written";
out.close();
}else{
result = "file cant write";
}
}catch( IOException e ){
e.printStackTrace();
result = "file not written";
}
return result;
}
public boolean readFromFile(){
return false;
}
}
I have not implemented the readFromFile() yet.
The problem is that root.canWrite() returns false all the time.
Here is the manifest file:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".InfoScreen"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<activity android:name=".EventCalendar"
android:label="#string/app_name" />
<activity android:name=".MakeEvent"
android:label="#string/app_name" />
<activity android:name=".ViewEvent"
android:label="#string/app_name" />
</application>
<uses-sdk android:minSdkVersion="8" />
I've asked for the permission to write, and on my avd, if i go to settings -> SD card and phone storage, it tells me i have 1 gb on the sd card to write on. Please help.
Thanks:)
Try checking the state of the SD card before you attempt to write to it. It may be used as a shared drive, corrupted, full, etc. A list of states can be found here: http://developer.android.com/reference/android/os/Environment.html
Here's an example of getting the states:
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
mExternalStorageAvailable = mExternalStorageWriteable = true;
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
mExternalStorageAvailable = true;
mExternalStorageWriteable = false;
} else {
mExternalStorageAvailable = mExternalStorageWriteable = false;
}
Which result are you seeing retunred from writeToFile? "file not written" or "file cant write"?
When I ran your code it dropped into the catch IOException block with the result of "file not written". The reason for this was that fos was defined incorrectly:
fos = new FileOutputStream( saveFileName );
should be:
fos = new FileOutputStream( root + "/" saveFileName );
After I changed this line, I got the result "File written" returned from writeToFile.
I use the following code to record audio data (successfully) to my Android's SD Card. My application requires the RECORD_AUDIO permission, but nothing else.
File file = new File (Environment.getExternalStorageDirectory().getAbsolutePath() + FILE_NAME);
if (file.exists())
file.delete(); // Delete any previous recording
try
{
file.createNewFile(); // Create the new file
}
catch (IOException e)
{
Log.e (TAG, "Failed to create " + file.toString());
}
try
{
OutputStream os = new FileOutputStream (file);
BufferedOutputStream bos = new BufferedOutputStream (os, 8000);
DataOutputStream dos = new DataOutputStream (bos); // Create a DataOutputStream to write the audio data to the file
// Create an AudioRecord object to record the audio
int bufferSize = AudioRecord.getMinBufferSize (frequency, channelConfig, Encoding);
AudioRecord audioRecord = new AudioRecord (MediaRecorder.AudioSource.MIC, frequency, channelConfig, Encoding, bufferSize);
short[] buffer = new short[bufferSize]; // Using "short", because we're using "ENCODING_PCM_16BIT"
audioRecord.startRecording();
while (isRecording)
{
int bufferReadResult = audioRecord.read (buffer, 0, bufferSize);
for (int i = 0; i < bufferReadResult; i++)
dos.writeShort (buffer[i]);
}
audioRecord.stop();
dos.close();
}
catch (Exception t)
{
Log.e (TAG, "Recording Failed");
}
It would appear to me that you're missing the getAbsolutePath() call appended to your getExternalStorageDirectory() call (which may have the same result as Marc Bernstein's hard coded solution).
I should have included the following link as well (since it's where I got the code that writes to the SD Card...):
http://emeadev.blogspot.com/2009/09/raw-audio-manipulation-in-android.html
Related
I need to write a simple text in a file "test.txt".
This is my code:
String SDCARD = Environment.getExternalStorageDirectory().getAbsolutePath();
String FILENAME = "test.txt";
File outfile = new File(SDCARD+File.separator+FILENAME);
if (outfile.exists()) { Log.d("Filename","the file exists"); }
Log.d("Filename",SDCARD+File.separator+FILENAME);
FileOutputStream fos = new FileOutputStream(outfile,true);
fos.write("just a test".getBytes());
fos.close();
In the manifest there is the permission request:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.xrobot.john.texttest">
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
and the targetsdkversion is 15.
Logcat display this:
12-01 12:57:26.178 29663-29663/com.xrobot.john.softkeyboard D/Filename﹕ the file exists
12-01 12:57:26.178 29663-29663/com.xrobot.john.softkeyboard D/Filename﹕ /storage/emulated/0/test.txt
and the file text.txt is always empty.
Why ?
You are perhaps missing permission for reading that file.
Also, you are missing fos.flush() between fos.write() and fos.close() , that can easily cause that unexpected behavior.
Use a buffered writer to write your string to a file
BufferedWriter writer = null;
try
{
writer = new BufferedWriter( new FileWriter(SDCARD+File.separator+FILENAME));
writer.write( "just a test");
}
catch ( IOException e)
{
}
finally
{
try
{
if ( writer != null)
writer.close( );
}
catch ( IOException e)
{
}
}
Within my app I am trying to write a file, which I can then internally read from.
Would anyone have an example of how to write files to the installation folders of app?
use the following code to write from Edittext into file and read from file into Edittext
set the following permission to AndroidManifest.xml
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>
JAVA CODE
EditText LoadedText;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
LoadedText=(EditText) findViewById(R.id.LoadedText);
File sdcard = Environment.getExternalStorageDirectory();
//Get the text file
File file = new File("/sdcard/RouterSetup.txt");
//Read text from file
StringBuilder text = new StringBuilder();
try {
BufferedReader br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
text.append(line);
text.append('\n');
}
br.close();
}
catch (IOException e) {
//You'll need to add proper error handling here
}
LoadedText.setText(text.toString());
}
public void saveFile() {
try {
File myFile = new File("/sdcard/RouterSetup.txt");
myFile.createNewFile();
FileOutputStream fOut = new FileOutputStream(myFile);
OutputStreamWriter myOutWriter =
new OutputStreamWriter(fOut);
myOutWriter.append(LoadedText.getText());
myOutWriter.close();
fOut.close();
Toast.makeText(getBaseContext(),
"Done writing SD " + LoadedText.getText() + ".txt",
Toast.LENGTH_SHORT).show();
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.getMessage(),
Toast.LENGTH_SHORT).show();
}
}
getFilesDir() vs Environment.getDataDirectory()
public File getFilesDir ()
Returns the absolute path to the directory on the filesystem where files created with openFileOutput(String, int) are stored.
public static File getExternalStorageDirectory ()
Return the primary external storage directory. This directory may not currently be accessible if it has been mounted by the user on their computer, has been removed from the device, or some other problem has happened. You can determine its current state with getExternalStorageState().
If you want to get your application path use getFilesDir() which will give you path /data/data/your package/files
You can get the path using the Environment var of your data/package using the
getExternalFilesDir(Environment.getDataDirectory().getAbsolutePath()).getAbsolutePath(); which will return the path from the root directory of your external storage as /storage/sdcard/Android/data/your pacakge/files/data
To access the external resources you have to provide the permission of WRITE_EXTERNAL_STORAGE and READ_EXTERNAL_STORAGE in your manifest.
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
The simplest solution is
String filename = "stuff.xml";
READ
FileInputStream stream = ctx.openFileInput(filename);
(and below is a really simple example of parsing that file)
BufferedReader buffReader = new BufferedReader(new InputStreamReader(inputStream));
String line;
try {
while ((line = buffReader.readLine()) != null) {
...
// do something cool
...
}
} catch (IOException e) {
Log.e("MyApp", "SCREAAAAAM", e);
}
WRITE
OutputStreamWriter outputStreamWriter = new OutputStreamWriter( ctx.openFileOutput(filename, Context.MODE_PRIVATE) );
outputStreamWriter.write("this is text not xml :(");
So the two main things to note are the openFileInput and openFileOutput methods of Context (ie your activity) which take care of the heavy lifting
//here i am downloading file from server and writing
String download_link = "some server location";
URL url = new URL(download_link);
HttpsURLConnection c = null;
if (url.getProtocol().toLowerCase().equals("https")) {
trustAllHosts();
c = (HttpsURLConnection) url.openConnection();
c.setHostnameVerifier(DO_NOT_VERIFY);
}
c.setRequestMethod("GET");
c.setDoOutput(true);
c.connect();
String PATH = Environment.getExternalStorageDirectory() + "/download/";
File file = new File(PATH);
file.mkdirs();
File outputFile = new File(file, "Mobi.apk");
if(outputFile.exists()){
outputFile.delete();
}
FileOutputStream fos = new FileOutputStream(outputFile);
InputStream is = c.getInputStream();
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = is.read(buffer)) != -1) {
fos.write(buffer, 0, len1);
}
fos.close();
is.close();
you need to add permission in manifest file:
uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>
Which type of files you are talking about ?
For data storage you can use shared preferences.
For media type you can use media storage.
i try to write text in file.i wrote code ,witch can to write text ,but if i will use again my code again text is rewrite in file.for example if i first time write "Hello android" and then "Sir",result is only "Sir".i want "Hello android Sir"
your_file = new File("/sdcard/facebookUser");
try {
Writer writer = new OutputStreamWriter(new FileOutputStream(
your_file), "UTF-8");
writer.write(facebook_user_name + ",");
writer.write(facebook_id);
writer.close();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (writer != null) {
try {
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
how i can write code to save another text in this file second time?
new FileOutputStream(your_file, true)
public FileOutputStream(String name, boolean append) throws FileNotFoundException
append - if true, then bytes will be written to the end of the file rather than the beginning
Instead of:
writer = new OutputStreamWriter(new FileOutputStream(
your_file), "UTF-8");
Use:
writer = new OutputStreamWriter(new FileOutputStream(
your_file, true), "UTF-8");
This sets the FileOutputStream in append mode.
java.io.FileOutputStream.FileOutputStream(File file, boolean append)
throws FileNotFoundException
Constructs a new FileOutputStream that writes to file. If append is
true and the file already exists, it will be appended to; otherwise it
will be truncated. The file will be created if it does not exist.
try {
int n = 0;
String Name = "file";
File myFile = new File("/sdcard/test/");
if (!myFile.exists()) {
boolean b = myFile.mkdirs(); }
myFile = new File("/sdcard/test/"+Name+".txt");
while (myFile.exists())
{
myFile = new File("/sdcard/test/"+Name+n+".txt");
n++;
}
myFile.createNewFile();
FileOutputStream fOut = new FileOutputStream(myFile);
OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);
String str = "Your text to write";
myOutWriter.append(str);
myOutWriter.close();
fOut.close();
} catch (Exception e) {}
And do not forget permision:
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
Vladimir Kulyk and user2450263 are correct! You have to write a file in append mode. try this link.
I have some images to be displayed in the Application (When user selects an image from it, like picking from gallery ).
The question is how to copy the images I am putting in the assets
folder in the code to a folder on the SD card.
Edit: I tried this example : http://www.technotalkative.com/android-copy-files-from-assets-to-sd-card/
I have given the app permission to read and write
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
AssetManager assetManager = context.getAssets();
InputStream is = assetManager.open(fileName);
Get the AssetManager and call open with the filename you want to copy as parameter.
Then you can simply copy in this way
File out = new File(Environment.getExternalStorageDirectory(), fileName);
byte[] buffer = new byte[BUFFER_LEN];
FileOutputStream fos = new FileOutputStream(out);
int read = 0;
while ((read = is.read(buffer, 0, BUFFER_LEN)) >= 0) {
fos.write(buffer, 0, read);
}
fos.flush();
fos.close()
is.close()
remember to add the WRITE_EXTERNAL_STORAGE permission in your AndroidManifest.xml file
private void copyFileAssets() {
AssetManager assetManager = getAssets();
InputStream in = null;
OutputStream out = null;
try {
in = assetManager.open("ceo.jpg");
out = new FileOutputStream(Environment.getExternalStorageDirectory()+File.separator+ "abc.jpg");
copyFile(in, out);
in.close();
in = null;
out.flush();
out.close();
out = null;
} catch(IOException e) {
Log.e("tag", "Failed to copy asset file: " + filename, e);
}
}
private void copyFile(InputStream in, OutputStream out) throws IOException {
byte[] buffer = new byte[1024];
int read;
while((read = in.read(buffer)) != -1){
out.write(buffer, 0, read);
}
}
you have to add this permission:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
Get the bitmap resource using one of the many ways.
Ex:
Bitmap bitmap = BitmapFactory.decodeResource(resource, id); // get your bitmap that you want to save on SD card.
Get the path to store the resource.
String compressedFilePath = Environment.getExternalStorageDirectory() + File.separator + "FOLDERNAME" + File.separator + "FILENAME.jpg";
Save using compress method. (Shortcut way to save image as per docs)
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(new File(pathToStore))); // use 100 to make sure image quality is not reduced(Read the docs)
Note: You need Write(and may be read in future) access to write to SDCARD.
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
Well, I tried a lot of things, but the better goal that I achieve is copy the desired file to sd, but the new file size is 0bytes always :(
This is my code :
String baseDir = Environment.getExternalStorageDirectory().getAbsolutePath();
String fileName = sonidoActual+".mp3";
File newSoundFile = new File(baseDir, fileName);
Uri mUri = Uri.parse("android.resource://com.genaut.ringtonelists/raw/"+sonidoActual);
AssetFileDescriptor soundFile;
try {
soundFile= getContentResolver().openAssetFileDescriptor(mUri, "r");
} catch (FileNotFoundException e) {
soundFile=null;
}
try {
byte[] readData = new byte[1024*500];
FileInputStream fis = soundFile.createInputStream();
FileOutputStream fos = new FileOutputStream(newSoundFile);
int i = fis.read(readData);
while (i != -1) {
fos.write(readData, 0, i);
i = fis.read(readData);
Log.d("Degug - While: ", "i: "+i);
}
fos.flush();
fos.close();
} catch (IOException io) {
}
Sorry for my bad english.Any one know the problem? Thanks a lot!
I have these permissions on my manifest:
<uses-permission android:name="android.permission.WRITE_SETTINGS" />
<uses-permission android:name="android.permission.CHANGE_CONFIGURATION" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
More info:
I tried some code to copy files from assets and not work.. I have some app that set Ringtone well, so I don't think that my SD has a problem.. I feel hopeless :S
These are the code from assets, apparently works fine: https://stackoverflow.com/a/4530294/1422434
I tried too with getResources.openRawResource(): but not works
String baseDir = Environment.getExternalStorageDirectory().getAbsolutePath();
String fileName = nombreActual+".mp3";
File newSoundFile = new File(baseDir, fileName);
try {
byte[] readData = new byte[1024*500];
InputStream fis = getResources().openRawResource(contexto.getResources().getIdentifier(sonidoActual,"raw", contexto.getPackageName()));
FileOutputStream fos = new FileOutputStream(newSoundFile);
int i = fis.read(readData);
while (i != -1) {
fos.write(readData, 0, i);
i = fis.read(readData);
}
fos.close();
} catch (IOException io) {
}
As you are using the raw folder, simply use this from your activity:
getResources().openRawResource(resourceName)