I want to write string of data in a file in android . That is why I have the following code :
public String DumpFile(String fileName,String data)
{
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/saved_data");
myDir.mkdirs();
if(myDir.exists())
Toast.makeText(this, "Directory exists" ,Toast.LENGTH_LONG).show();
else
Toast.makeText(this, "directory not exists " ,Toast.LENGTH_LONG).show();
// Random generator = new Random();
String fname = fileName;
// showToastOnUiThread("File Name: "+fname+" and Data: "+data,
// Toast.LENGTH_LONG);
File file = new File(myDir, fname);
Toast.makeText(this, "Link is "+file.getAbsolutePath(),Toast.LENGTH_LONG).show();
// Toast.makeText(this, "Content is "+data,Toast.LENGTH_LONG).show();
OutputStream bos = null;
FileOutputStream out = null;
if (file.exists())
file.delete();
try {
out = new FileOutputStream(file);
bos = new BufferedOutputStream(out);
bos.write(data.getBytes());
bos.flush();
// out.flush();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (out != null) {
try {
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (bos != null) {
try {
bos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
return fname;
}
But when I have run the code , I have got the Toast that directory not exists . Where is the error ? Can you help me ?
Add the permission to your manifest
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
Related
I have created a file and written into the file using editText. Now I want to write into a file named "note.txt". But the content to be written should be stored in a variable. Can any one help me with the code??
private void writeFile() {
File extStore = Environment.getExternalStorageDirectory();
// ==> /storage/emulated/0/note.txt
String path = extStore.getAbsolutePath() + "/" + fileName;
Log.i("ExternalStorageDemo", "Save to: " + path);
String data = editText.getText().toString();
try {
File myFile = new File(path);
myFile.createNewFile();
FileOutputStream fOut = new FileOutputStream(myFile);
OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);
myOutWriter.append(data);
myOutWriter.close();
fOut.close();
Toast.makeText(getApplicationContext(), fileName + " saved", Toast.LENGTH_LONG).show();
} catch (Exception e) {
e.printStackTrace();
}
}
Do you mean this?:
private void save(String inputText) {
FileOutputStream out = null;
BufferedWriter writer = null;
try{
out = openFileOutput("note.txt",Context.MODE_PRIVATE);
writer = new BufferedWriter(new OutputStreamWriter(out));
writer.write(inputText);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally {
try{
if (writer!=null);
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
I've created Test.txt on sdcard and write string "test example" on it.
after that, I replace string "test" by "etc" in Test.txt.
this is my code :
String origin_str, old_str , new_str;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_t2);
origin_str = "test example";
old_str = "test";
new_str = "etc";
Button bt_create2 = (Button)findViewById(R.id.bt_createfileT2);
bt_create2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
try {
File newFolder = new File(Environment.getExternalStorageDirectory(), "TestFolder");
if (!newFolder.exists()) {
newFolder.mkdir();
}
File file = new File(newFolder, "Test" + ".txt");
if (!file.exists()) {
file.createNewFile();
FileOutputStream fOut = new FileOutputStream(file);
OutputStreamWriter myOutWriter =new OutputStreamWriter(fOut);
myOutWriter.append(origin_str);
myOutWriter.close();
fOut.close();
}
} catch (Exception e) {
System.out.println("e: " + e);
}
}
});
Button bt_replacefileT2 = (Button)findViewById(R.id.bt_replacefileT2);
bt_replacefileT2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
try {
File file = new File(Environment.getExternalStorageDirectory() + "/TestFolder/Test.txt");
FileInputStream in = new FileInputStream(file);
int len = 0;
byte[] data1 = new byte[1024];
while ( -1 != (len = in.read(data1)) ){
if(new String(data1, 0, len).contains(old_str)){
String s = "";
s = s.replace(old_str, new_str);
}
}
}
catch (Exception e){
e.printStackTrace();
}
}
});
with this code, it was create Test.txt on sdcard and write "test example" on it.
but when replace string "test" by "etc", it not working.
how to fix it?
I will give my code, always worked for me :)
Hope thi can help you :DD
public void saveString(String text){
if(this.isExternalStorageAvailable()){
if(!this.isExternalStorageReadOnly()){
try {
FileOutputStream fos = new FileOutputStream(
new File(this.getExternalFilesDir("text"), "text.dat"));
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeBytes(text);
oos.close();
fos.close();
} catch (FileNotFoundException e) {
//Toast.makeText(main, "Eror opening file", Toast.LENGTH_SHORT).show();
} catch (IOException e) {
//Toast.makeText(main, "Eror saving String", Toast.LENGTH_SHORT).show();
}
}
}
}
private static boolean isExternalStorageAvailable(){
String estadoSD = Environment.getExternalStorageState();
if(Environment.MEDIA_MOUNTED.equals(estadoSD))
return true;
return false;
}
private static boolean isExternalStorageReadOnly(){
String estadoSD = Environment.getExternalStorageState();
if(Environment.MEDIA_MOUNTED_READ_ONLY.equals(estadoSD))
return true;
return false;
}
public String getString(){
FileInputStream fis = null;
ObjectInputStream ois = null;
if(this.isExternalStorageAvailable()) {
try {
fis = new FileInputStream(
new File(this.getExternalFilesDir("text"), "text.dat"));
ois = new ObjectInputStream(fis);
String text = (String)ois.readObject();
return familia;
} catch (FileNotFoundException e) {
//Toast.makeText(main, "The file text doesnt exist", Toast.LENGTH_SHORT).show();
} catch (StreamCorruptedException e) {
//Toast.makeText(main, "Eror opening file", Toast.LENGTH_SHORT).show();
} catch(EOFException e){
try {
if(ois != null)
ois.close();
if(fis != null)
fis.close();
} catch (IOException e1) {
e1.printStackTrace();
}
} catch (IOException e) {
//Toast.makeText(main, "eror reading file", Toast.LENGTH_SHORT).show();
} catch (ClassNotFoundException e) {
//Toast.makeText(main, "String class doesnt exist", Toast.LENGTH_SHORT).show();
}
}
return null;
}
try this
File file = new File(Environment.getExternalStorageDirectory() + "/TestFolder/Test.txt");
try {
BufferedReader br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
line = line.replace(old,new);
}
br.close();
FileOutputStream fOut = new FileOutputStream(file);
OutputStreamWriter myOutWriter =new OutputStreamWriter(fOut);
myOutWriter.write(line);
myOutWriter.close();
fOut.close();
}
catch (IOException e) {
//You'll need to add proper error handling here
}
File albumF = getVideoAlbumDir();
String path = albumF.getAbsolutePath();
// path =/storage/emulated/0/Pictures/.MyImages (Hidden folder)
// fileSelected.fileName()=IMG_20140417_113847.jpg
File localFile = new File(path + "/" + fileSelected.fileName());
Log.v("", "file exist===" + localFile.exists());
if (!localFile.exists()) {
Log.v("", "inside if===");
Log.v("", "Parent Filet===" + localFile.getParentFile());
localFile.getParentFile().mkdirs();
// localFile.createNewFile();
copy(fileSelected, localFile);
} else {
Log.v("", "inside else===");
mCurrentPhotoPath = localFile.getAbsolutePath();
uploadMediaFile();
}
This copy method copies data from dropbox file to my local storage.
private void copy(final Entry fileSelected, final File localFile) {
final ProgressDialog pd = ProgressDialog.show(ChatActivity.this,
"Downloading...", "Please wait...");
new Thread(new Runnable() {
#Override
public void run() {
BufferedInputStream br = null;
BufferedOutputStream bw = null;
DropboxInputStream fd;
try {
fd = mDBApi.getFileStream(fileSelected.path,
localFile.getAbsolutePath());
br = new BufferedInputStream(fd);
bw = new BufferedOutputStream(new FileOutputStream(
localFile));
byte[] buffer = new byte[4096];
int read;
while (true) {
read = br.read(buffer);
if (read <= 0) {
break;
}
bw.write(buffer, 0, read);
}
pd.dismiss();
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
android.os.Message msg = new android.os.Message();
msg.arg1 = 100;
if (msg.arg1 >= 100) {
progressHandler.sendMessage(msg);
mCurrentPhotoPath = localFile.getAbsolutePath();
}
} catch (DropboxException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (bw != null) {
try {
bw.close();
if (br != null) {
br.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}).start();
I am creating file in a folder using localFile.getParentFile().mkdirs();
I got above error when I upload this file to server.
how to fix this?
If you've tried all other options - and problem still persists - then maybe you have a case when the file you want to create matches name of already existing directory.(which might be earlier created my some call to mkdirs() maybe accidentally).
Example:
You want to save file Test\test.pdf but you already have folder Test\Test.pdf\
I want to retain some strings even when i clear my app data so i am using text files saved in sd card.
I am using sd card files to store myStrings and read them at run time. but each and every time readfile return null.
following is my code:
protected void writeToFile(String data, String fileName) {
String root_sd = Environment.getExternalStorageDirectory().toString();
File dir = new File(root_sd+"/"+"AntiVirusPref");
if(dir.mkdir())
{
File f=new File( dir.getAbsolutePath()+"/"+fileName);
if (f.exists()) {
f.delete();
}
if (!f.exists()) {
try {
f.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
else {
File f=new File( dir.getAbsolutePath()+"/"+fileName);
if (f.exists()) {
f.delete();
}
if (!f.exists()) {
try {
f.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
try {
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(openFileOutput(fileName, Context.MODE_PRIVATE));
outputStreamWriter.write(data);
outputStreamWriter.close();
}
catch (IOException e) {
Log.e("Exception", "File write failed: " + e.toString());
}
}
protected String readFromFile(String fileName, String defaultValue) {
String ret = "";
String root_sd = Environment.getExternalStorageDirectory().toString();
File dir = new File(root_sd+"/"+"AntiVirusPref");
File file = new File(dir.getAbsolutePath() + "/"+fileName);
try {
//InputStream inputStream = openFileInput("/sdcard/"+fileName);
FileInputStream inputStream = new FileInputStream(file);
if ( inputStream != null ) {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String receiveString = "";
StringBuilder stringBuilder = new StringBuilder();
/*if((receiveString = bufferedReader.read) != null){
stringBuilder.append(receiveString);
}*/
String line="";
int c;
while ((c = bufferedReader.read()) != -1) {
line+=(char)c;
//counter++;
}
stringBuilder.append(line);
inputStream.close();
ret = stringBuilder.toString();
}
}
catch (FileNotFoundException e) {
Log.e("login activity", "File not found: " + e.toString());
} catch (IOException e) {
Log.e("login activity", "Can not read file: " + e.toString());
}
if (ret.equals("")) {
ret=defaultValue;
}
return ret;
}
try to add the "file:///" suffix before the Uri
I want to create a file on sdcard. Here I can create file and read/write it to the application, but what I want here is, the file should be saved on specific folder of sdcard. How can I do that using FileOutputStream?
// create file
public void createfile(String name)
{
try
{
new FileOutputStream(filename, true).close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// write to file
public void appendToFile(String dataAppend, String nameOfFile) throws IOException
{
fosAppend = openFileOutput(nameOfFile, Context.MODE_APPEND);
fosAppend.write(dataAppend.getBytes());
fosAppend.write(System.getProperty("line.separator").getBytes());
fosAppend.flush();
fosAppend.close();
}
Here's an example from my code:
try {
String filename = "abc.txt";
File myFile = new File(Environment
.getExternalStorageDirectory(), filename);
if (!myFile.exists())
myFile.createNewFile();
FileOutputStream fos;
byte[] data = string.getBytes();
try {
fos = new FileOutputStream(myFile);
fos.write(data);
fos.flush();
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
And don't forget the:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
Try like this,
try {
File newFolder = new File(Environment.getExternalStorageDirectory(), "TestFolder");
if (!newFolder.exists()) {
newFolder.mkdir();
}
try {
File file = new File(newFolder, "MyTest" + ".txt");
file.createNewFile();
} catch (Exception ex) {
System.out.println("ex: " + ex);
}
} catch (Exception e) {
System.out.println("e: " + e);
}
It's pretty easy to create folder and write file on sd card in android
Code snippet
String ext_storage_state = Environment.getExternalStorageState();
File mediaStorage = new File(Environment.getExternalStorageDirectory()
+ "/Folder name");
if (ext_storage_state.equalsIgnoreCase(Environment.MEDIA_MOUNTED)) {
if (!mediaStorage.exists()) {
mediaStorage.mkdirs();
}
//write file writing code..
try {
FileOutputStream fos=new FileOutputStream(file name);
try {
fos.write(filename.toByteArray());
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else
{
//Toast message sd card not found..
}
Note: 'getExternalStorageDirectory()'
actually gives you a path to /storage/emulated/0 and not the actual sdcard
'String path = Syst.envr("SECONDARY_STORAGE");' gives you a path to the sd card