Develop Reference

file chooser to choose folder (android)

i am using afilechooser for this purpose . and this is by default programmed to choose the items inside the folder and get you the path that is selected by the user.
but i want to use this as folder chooser where the user choose a location from internal memory of android device and then the app will save the file at that location.
so how do i do it.
the code i am using for this purpose is-
private void showChooser() {
// Use the GET_CONTENT intent from the utility class
Intent target = FileUtils.createGetContentIntent();
// Create the chooser Intent
Intent intent = Intent.createChooser(
target, getString(R.string.chooser_title));
try {
startActivityForResult(intent, REQUEST_CODE);
} catch (ActivityNotFoundException e) {
// The reason for the existence of aFileChooser
}
}
and i suspect the code can be changed to choose the folder instead of files. any suggestion can be helpful . please suggest if any other way to achieve what is want .
thank you

Looking at the github project in the url you posted, it doesn't look like this can be achieved. My claim is based on the following piece of code inside com.ipaulpro.afilechooser.FileChooserActivity class:
#Override
public void onFileSelected(File file) {
if (file != null) {
if (file.isDirectory()) {
replaceFragment(file);
} else {
finishWithResult(file);
}
} else {
Toast.makeText(FileChooserActivity.this, R.string.error_selecting_file,
Toast.LENGTH_SHORT).show();
}
}
just look at the if(file.isDirectory()) statement.

Android System app not able to create directories

I am developing an android app.In one of the modules I am creating a directory in the external storage to store files using the below code.Things work fine and I am able to create the directory.
public class Main extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btnCreateDir = (Button) findViewById(R.id.createDir);
btnCreateDir.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
try {
File pictureFileDir = getDir();
if (!pictureFileDir.exists() && !pictureFileDir.mkdirs()) {
Toast.makeText(getApplicationContext(),"Can't create directory",Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(),"directory created/exists",Toast.LENGTH_LONG).show();
}
} catch (Exception e4) {
e4.printStackTrace();
}
}
});
}
private File getDir() {
File sdDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
return new File(sdDir, "GaPopupFile");
}
}
However, when I make this app as a system app(by signing with the system certificates and storing in system/app folder) I see that this same code when executed,returns 'Can't create directory' . How is this possible,what am I missing here ?

Have you added this permission in AndroidManifest.xml file?
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
Read permission needed to read file in Android applications.
Write permission needed to write file in Android applications.

App crash when directory does not exist

Hi I am fairly an amateur at android so I might not be realizing something obvious.
I have a method that populates a global File Array variable with a list of flies in a specific directory. Problem is everything works fine if the directory has been made before by using my app to save a file there however when the user hasn't done that an error message is suppose to pop up saying they haven't saved a file yet.
I do a check if the directory exist but the app crashes when the directory has not been created.
This is what my code looks like any assistance would be appreciated
private void getTemplates()
{
//Gets file directory for saved templates
File finalMarkTemplateDir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/Final Mark Templates");
//Checks if path exists in other word if any templates have been saved before
if(finalMarkTemplateDir.exists())
{
templatePaths = finalMarkTemplateDir.listFiles();
}
else
{
Toast.makeText(this, "No previous templates have been saved.", Toast.LENGTH_LONG).show();
setResult(RESULT_CANCELED);
finish();
}
}

I am too an amateur, you have not created a file in your code, calling a new file() method does not create a file. Pls check that out
try {
finalMarkTemplateDir.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

I managed to solve my problem when I call the setResult and finish methods I did not realize the flow of the program is returned to my onCreate method which meant the rest of my method calls in onCreate was still being called and they require the templatePaths array.
So basically I thought finish would stop the processing and move back to the calling class(using startActivityForResult). Instead I now call finish from my onCreate and use a boolean to determine if I could successfully access the directory.
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
//setContentView(R.layout.dialog_load_template);
boolean fileLoadStatus = getTemplates();
if(fileLoadStatus)
{
populateTemplateList(templatePaths);
}
else
{
setResult(RESULT_CANCELED);
finish();
}
}
private boolean getTemplates()
{
boolean fileLoadStatus = false;
//Gets file directory for saved templates
File finalMarkTemplateDir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/Final Mark Templates");
//Checks if path exists in other word if any templates have been saved before
if(finalMarkTemplateDir.isDirectory())
{
templatePaths = finalMarkTemplateDir.listFiles();
fileLoadStatus = true;
}
else
{
Toast.makeText(this, "No previous templates have been saved.", Toast.LENGTH_LONG).show();
}
return fileLoadStatus;
}

Android: Load text file located in app/src/main/

I'm attempting to use some code to load a basic changelog from a text file into an alert dialog. The only issue is that I am having trouble getting my code to find the location of my changelog file. The file "changelog" is located in app/src/main/. Here is a sample of my code.
private void displayChangelogDialog() {
Context context = this;
try {
new AlertDialog.Builder(this)
.setTitle("Changelog")
.setMessage(readFile(getApplicationContext().getFilesDir().getAbsolutePath() + "/app/src/main/changelog"))
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// do nothing
}
})
.show();
} catch (IOException e) {
Toast.makeText(MainActivity.this, "Error", Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
}
I am not very familiar with getFilesDir() or getAbsolutePath(), so I'd imagine this would be a good learning experience if anyone can help me figure out what I'm doing wrong. I'm sure the problem resides in the path I have entered, but I am a bit stumped at the moment. Thanks in advance.

getFilesDir documentation:
Returns the absolute path to the directory on the filesystem where files created with openFileOutput(String, int) are stored.
Typically, openFileOutput access to /data/data, which is completly different from your application install path.
If you want to access a file, put it in the assets folder the check the assets related functions (see AssetManaget)

Dropbox Sync Api. Not seeing the File on Dropbox the first time round

I have a DropboxHelper Class that is handling downloading and uploading from dropbox.
Downloading works fine but when I try to upload from dropbox the first time the code is called. The following Line is false
if (dropboxFileSystem.isFile(dropboxPath)) {
}
It returns false. Tell the app to try again and this time it sees the file and uploads it to the app. Below is some of the code I am using for the class. Debug seems to incdicate the dropbox api has not completing started / synced the first time
public class DropBoxHelper {
public DropBoxHelper(Context pContext) {
context = pContext;
defineVariables();
}
private void defineVariables() {
dropboxAccountManager = DbxAccountManager.getInstance(context.getApplicationContext(), DROPBOX_APP_KEY, DROPBOX_APP_SECRET);
dropboxPath = new DbxPath(DbxPath.ROOT, DROPBOX_FILE_NAME);
}
public boolean importFromDropbox() {
try {
dropboxFileSystem = DbxFileSystem.forAccount(dropboxAccountManager.getLinkedAccount());
if (dropboxFileSystem.isFile(dropboxPath)) {
DbxFile databaseFileonDropbox = dropboxFileSystem.open(dropboxPath);
try {
// Do Copy
} finally {
Log.i(DEBUG_TAG, "Closing File");
databaseFileonDropbox.close();
}
}
Any ideas on why the copy fails first time.
Thanks

I'm not 100% sure, but I believe you need to use dropboxFileSystem.awaitFirstSync() to make sure at least one sync with the server has happened before you try to find the file.
An alternative might be to just call dropboxFileSystem.open(...) directly and handle the exception that's raised if the file doesn't exist.