I have some text files on my android's SD Card, and i need to access one of them.
I came across the below code here:
//Find the directory for the SD Card using the API
//*Don't* hardcode "/sdcard"
File sdcard = Environment.getExternalStorageDirectory();
//Get the text file
File file = new File(sdcard,"file.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');
}
}
catch (IOException e) {
//You'll need to add proper error handling here
}
//Find the view by its id
TextView tv = (TextView)findViewById(R.id.text_view);
//Set the text
tv.setText(text);
But in this part of the code:
//Get the text file
File file = new File(sdcard,"file.txt");
the name of the text file is specified but i need the user to choose the text file he wants (from those text files in SD Card). So how can i let the user brows the SD Card and choose
the file he wants?
You need a file chooser/browser to be created here. There are lots of libraries available using which you can achieve the required functionality. Here is one -
https://code.google.com/p/android-file-chooser/
Also, necessary code is required on first page. Like to invoke the file chooser, you will need to write these lines of code -
Intent intent = new Intent(this, FileChooser.class);
ArrayList<String> extensions = new ArrayList<String>();
extensions.add(".txt"); //can be used for multiple filters
intent.putStringArrayListExtra("filterFileExtension", extensions);
startActivityForResult(intent, FILE_CHOOSER);
And, for callback to get path of Selected File by User -
#Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if ((requestCode == FILE_CHOOSER) && (resultCode == -1)) {
String fileSelected = data.getStringExtra("fileSelected");
Toast.makeText(this, fileSelected, Toast.LENGTH_SHORT).show();
}
}
Related
I am working on an app where I want to be able to export and import some data from the app, on a .txt file.
The minimum API of the app is 21.
The export part works well, but I am having trouble with the import part.
I open the file explorer :
butImportPatient.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent();
intent.setAction(Intent.ACTION_OPEN_DOCUMENT);
intent.setType("*/*");
startActivityForResult(intent, IMPORTPATIENT_ACTIVITY_REQUEST_CODE);
}
});
This looks like it is working.
But my onActivityResult doesn't work, I didn't find how I can get the file from the Uri.
For now, here is my code :
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == IMPORTPATIENT_ACTIVITY_REQUEST_CODE && resultCode == RESULT_OK) {
File file = new File(data.getData().getPath()) ;
String path = file.getAbsolutePath() ;
StringBuilder text = new StringBuilder();
try {
BufferedReader br = new BufferedReader(new FileReader(path));
String line;
while ((line = br.readLine()) != null) {
text.append(line);
text.append("\n");
}
br.close();
} catch (IOException e) {
e.printStackTrace();
}
AlertDialog.Builder builder = new AlertDialog.Builder(this) ;
builder.setMessage(path)
.show() ;
}
}
It is a mix of multiple posts I saw here, but none seems to work.
I get this path :
/document/home:List.txt
It creates FileNotFoundException. How can I get the real path of the file ?
I didn't find how I can get the file from the Uri.
There is no file. ACTION_OPEN_DOCUMENT and ACTION_GET_CONTENT do not open a file. They open a document. That document might be a file. It might not.
That Uri might point to:
A local file on external storage
A local file on internal storage for the other app
A local file on removable storage
A local file that is encrypted and needs to be decrypted on the fly
A stream of bytes held in a BLOB column in a database
A piece of content that needs to be downloaded by the other app first
...and so on
How can I get the real path of the file ?
You don't.
If you wish to only accept files, integrate a file chooser library instead of using ACTION_OPEN_DOCUMENT or
ACTION_GET_CONTENT. Just bear in mind that filesystem access to external storage is limited on Android 10+.
If you use ACTION_GET_CONTENT, and the scheme of the Uri that you get is file, then getPath() will be a filesystem path.
Otherwise, you need to understand that you have no idea where the document is coming from, and stop thinking in terms of "real path of the file". Use ContentResolver and openInputStream() to make a copy of the content to some file that you control, then work with that file.
I am working on an app where I want to be able to export and import some data from the app, on a .txt file.
The minimum API of the app is 21.
The export part works well, but I am having trouble with the import part.
I open the file explorer :
butImportPatient.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent();
intent.setAction(Intent.ACTION_OPEN_DOCUMENT);
intent.setType("*/*");
startActivityForResult(intent, IMPORTPATIENT_ACTIVITY_REQUEST_CODE);
}
});
This looks like it is working.
But my onActivityResult doesn't work, I didn't find how I can get the file from the Uri.
For now, here is my code :
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == IMPORTPATIENT_ACTIVITY_REQUEST_CODE && resultCode == RESULT_OK) {
File file = new File(data.getData().getPath()) ;
String path = file.getAbsolutePath() ;
StringBuilder text = new StringBuilder();
try {
BufferedReader br = new BufferedReader(new FileReader(path));
String line;
while ((line = br.readLine()) != null) {
text.append(line);
text.append("\n");
}
br.close();
} catch (IOException e) {
e.printStackTrace();
}
AlertDialog.Builder builder = new AlertDialog.Builder(this) ;
builder.setMessage(path)
.show() ;
}
}
It is a mix of multiple posts I saw here, but none seems to work.
I get this path :
/document/home:List.txt
It creates FileNotFoundException. How can I get the real path of the file ?
I didn't find how I can get the file from the Uri.
There is no file. ACTION_OPEN_DOCUMENT and ACTION_GET_CONTENT do not open a file. They open a document. That document might be a file. It might not.
That Uri might point to:
A local file on external storage
A local file on internal storage for the other app
A local file on removable storage
A local file that is encrypted and needs to be decrypted on the fly
A stream of bytes held in a BLOB column in a database
A piece of content that needs to be downloaded by the other app first
...and so on
How can I get the real path of the file ?
You don't.
If you wish to only accept files, integrate a file chooser library instead of using ACTION_OPEN_DOCUMENT or
ACTION_GET_CONTENT. Just bear in mind that filesystem access to external storage is limited on Android 10+.
If you use ACTION_GET_CONTENT, and the scheme of the Uri that you get is file, then getPath() will be a filesystem path.
Otherwise, you need to understand that you have no idea where the document is coming from, and stop thinking in terms of "real path of the file". Use ContentResolver and openInputStream() to make a copy of the content to some file that you control, then work with that file.
I am working on an app where I want to be able to export and import some data from the app, on a .txt file.
The minimum API of the app is 21.
The export part works well, but I am having trouble with the import part.
I open the file explorer :
butImportPatient.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent();
intent.setAction(Intent.ACTION_OPEN_DOCUMENT);
intent.setType("*/*");
startActivityForResult(intent, IMPORTPATIENT_ACTIVITY_REQUEST_CODE);
}
});
This looks like it is working.
But my onActivityResult doesn't work, I didn't find how I can get the file from the Uri.
For now, here is my code :
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == IMPORTPATIENT_ACTIVITY_REQUEST_CODE && resultCode == RESULT_OK) {
File file = new File(data.getData().getPath()) ;
String path = file.getAbsolutePath() ;
StringBuilder text = new StringBuilder();
try {
BufferedReader br = new BufferedReader(new FileReader(path));
String line;
while ((line = br.readLine()) != null) {
text.append(line);
text.append("\n");
}
br.close();
} catch (IOException e) {
e.printStackTrace();
}
AlertDialog.Builder builder = new AlertDialog.Builder(this) ;
builder.setMessage(path)
.show() ;
}
}
It is a mix of multiple posts I saw here, but none seems to work.
I get this path :
/document/home:List.txt
It creates FileNotFoundException. How can I get the real path of the file ?
I didn't find how I can get the file from the Uri.
There is no file. ACTION_OPEN_DOCUMENT and ACTION_GET_CONTENT do not open a file. They open a document. That document might be a file. It might not.
That Uri might point to:
A local file on external storage
A local file on internal storage for the other app
A local file on removable storage
A local file that is encrypted and needs to be decrypted on the fly
A stream of bytes held in a BLOB column in a database
A piece of content that needs to be downloaded by the other app first
...and so on
How can I get the real path of the file ?
You don't.
If you wish to only accept files, integrate a file chooser library instead of using ACTION_OPEN_DOCUMENT or
ACTION_GET_CONTENT. Just bear in mind that filesystem access to external storage is limited on Android 10+.
If you use ACTION_GET_CONTENT, and the scheme of the Uri that you get is file, then getPath() will be a filesystem path.
Otherwise, you need to understand that you have no idea where the document is coming from, and stop thinking in terms of "real path of the file". Use ContentResolver and openInputStream() to make a copy of the content to some file that you control, then work with that file.
In my app I have this code allowing the user to select a file :
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("text/plain");
startActivityForResult(intent,1);
The user can select the .txt file from anywhere in his phone, even from google drive. When the file selection is done I retrieve a Uri object corresponding to the file. The problem is I can't use this Uri to read the file because it is not valid. Here is my code :
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 1) {
if (resultCode == RESULT_OK) {
Uri uri = data.getData();
File file = new File(uri.toString());
try{
InputStream inputStream = new FileInputStream(file);
int content;
while ((content = inputStream.read()) != -1) {
Log.d("===>", String.valueOf((char) content));
}
}catch (Exception e){
Log.d("===>", e.toString());
}
}
}
}
I always get a fileNotFoundException. My question is, is there a way to read the selected file (without knowing in advance the location it will come from). And if not, is there a way to copy the selected file in a folder from which I would easily get it ?
The problem is I can't use this Uri to read the file because it is not valid.
That is because a Uri is not a file.
is there a way to read the selected file (without knowing in advance the location it will come from)
The user did not select a file. The user selected a piece of content.
To consume the content represented by the Uri, call openInputStream() on a ContentResolver, passing in the Uri. This gives you an InputStream that you can use to read in the content.
I have used he Download Manager Class to download a text file from the server and stored it in the common external storage. Then I want to show the text file, may be using the listView class. I have searched the web and found that there are many examples showing how to display a text file from the App's resources. However, how can I show the file which is stored in a specific file path?
Thank you very much.
In your layout you'll need something to display the text. A TextView is the obvious choice. So you'll have something like this:
<TextView
android:id="#+id/text_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
And your code will look like this:
//Find the directory for the SD Card using the API
//*Don't* hardcode "/sdcard"
File sdcard = Environment.getExternalStorageDirectory();
//Get the text file
File file = new File(sdcard,"file.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
}
//Find the view by its id
TextView tv = (TextView)findViewById(R.id.text_view);
//Set the text
tv.setText(text);
Also, put external storage read permission to manifest file:
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
OR
You can also use default intent to do the JOB!
File txtfile = new File("/sdcard/some_file.txt");
Intent i = new Intent();
i.setDataAndType(Uri.fromFile(txtfile), "text/plain");
startActivity(i);
--
Try below code.
private void openFile() {
File file = new File("file_path");
Uri path = Uri.fromFile(file);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.setAction(Intent.ACTION_VIEW);
intent.setData(path);
intent.setType("text/plain");
try {
startActivity(intent);
} catch (ActivityNotFoundException e) {
Toast.makeText(getActivity(), "No application found",
Toast.LENGTH_SHORT).show();
}
}
You can open file from sd card by using code given below in external application which compatible to file extension,
public void openDocument(String fileName) {
File file = new File(Environment.getExternalStorageDirectory(), DATA_DIRECTORY + "/" + fileName);
Uri fileUri = Uri.fromFile(file);
Intent intent = new Intent(android.content.Intent.ACTION_VIEW);
String extension = MimeTypeMap.getFileExtensionFromUrl(fileUri.toString());
String mimetype = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
if (extension.equalsIgnoreCase("") || mimetype == null) {
// if there is no extension or there is no definite mimetype, still try to open the file
intent.setDataAndType(fileUri, "application/*");
} else {
intent.setDataAndType(fileUri, mimetype);
}
// custom message for the intent
startActivity(Intent.createChooser(intent, "Choose an Application:"));
}