Develop Reference

Store files in external path to application folder using getExternalFilesDir(String), MediaStore, or Intent#ACTION_OPEN_DOCUMENT?

I am developing an application, a function that I need is that I can open the camera to take a photo and store it in the path Pictures/Example I save the image in that path so that it can be opened from the google photos application.
With this fragment I create the path and name of the image and open the camera:
private void openCameraTocaptureImage() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
// Error occurred while creating the File
}
// Continue only if the File was successfully created
if (photoFile != null) {
Uri photoURI = FileProvider.getUriForFile(this,
"com.example.cameraimage.fileprovider",
photoFile);
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
}
}
}
My doubt is present when invoking createImageFile()
private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = new File(Environment.getExternalStorageDirectory(), Environment.DIRECTORY_PICTURES+"/Example");//********* Here is my doubt ******
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
currentPhotoPath = image.getAbsolutePath();
return image;
}
So far the application meets what I need, takes a picture and stores it in Pictures/Example and can be viewed from the Photos application, but reading the documentation I found this:
getExternalStorageDirectory
This method was deprecated in API level 29.
To improve user privacy, direct access to shared/external storage devices is deprecated. When an app targets Build.VERSION_CODES.Q, the path returned from this method is no longer directly accessible to apps. Apps can continue to access content stored on shared/external storage by migrating to alternatives such as Context#getExternalFilesDir(String), MediaStore, or Intent#ACTION_OPEN_DOCUMENT.
I decided to use getExternalFilesDir, So I tried to replace
File storageDir = new File(Environment.getExternalStorageDirectory(), Environment.DIRECTORY_PICTURES+"/Example");
with
File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES+"/Example");
So the code looks like this:
private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES+"/Example");
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
currentPhotoPath = image.getAbsolutePath();
return image;
}
But this causes my photo to be stored in Android/data/com.example.cameraimage/files/Pictures/Example it is not the path I want and it is not shown in Photos App
The main question is, should I stop using getExternalStorageDirectory() even though it works?
If I have to change how can I use any of the alternatives so that I can store photos in Pictures/Example and display the images in the Photos application?

Copy the gallery photo into my app's folder

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
//activity A intent
Intent intent = new Intent(Intent.ACTION_PICK,null);
intent.setType("image/*");
intent.putExtra("return-data", true);
startActivityForResult(intent,Constant.ACTION.LOAD_GALLERY_ACTION);
//this is onActicityResult function
case Constant.ACTION.LOAD_GALLERY_ACTION:
Uri uri = data.getData();
if(mImage.size()<maxAddPic) {
mImage.add(copyGalleryPic(uri));
adapter.notifyDataSetChanged();
}
break;
//to copy the gallery photo,return the new file uri.
private Uri copyGalleryPic(Uri uri) {
String filePath = Environment.getExternalStorageDirectory() + "/images/"+"diary"+System.currentTimeMillis()+".jpg";
File outputFile = new File(filePath);
if (!outputFile.getParentFile().exists()) {
outputFile.getParentFile().mkdirs();
}
Bitmap bitmap;
try (FileOutputStream fos = new FileOutputStream(outputFile)) {
bitmap=MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
bitmap.compress(Bitmap.CompressFormat.JPEG,100,fos);
} catch (IOException e) {
// ... handle IO exception
}
Uri newUri = FileProvider.getUriForFile(CreateDiaryActivity.this,"com.example.diary.cr",outputFile);
return newUri;
}
but there are some errors
the intent returns uri
"content://com.google.android.apps.photos.contentprovider/-1/1/content%3A%2F%2Fmedia%2Fexternal%2Fimages%2Fmedia%2F29/ORIGINAL/NONE/41130179"
but debug info shows the code
"bitmap=MediaStore.Images.Media.getBitmap(getContentResolver(),
uri);" error : java.io.FileNotFoundException: open failed: ENOENT
(No such file or directory)
please help me ! Love you guys!
My English is not well. please use Simple words. Thank you!

which android version and which sdk-version are you using? I have an android-2.2 app that cannot receive intent permissions under android 7 see: https://github.com/k3b/intent-intercept/issues/4. I assume that recompiling with a more recent android-sdk might help.
Does you program work if you use an InputStream to read the picked image via getContentResolver().openInputStream(data.getData(uri)).
Since android-4.4 ACTION_PICK was replaced by ACTION_OPEN_DOCUMENT. My recent apps that use ACTION_OPEN_DOCUMENT together with openInputStream work as expected

open a folder from application by default file manager

I want to open a folder base on the path by device file manager .
I create a folder and save in save it into SharedPreferences .
now I want to open this folder .
I create a folder like this :
public static File myDirectory;
myDirectory = new File(Environment.getExternalStorageDirectory(), getString(R.string.app_name));
if(!myDirectory.exists()) {
myDirectory.mkdirs();
}
in my application class.
and now I want to open this address:
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
Uri uri = Uri.parse(Environment.getExternalStorageDirectory().getPath()
+ File.separator + getString(R.string.app_name) + File.separator);
intent.setDataAndType(uri, "text/csv");
startActivity(Intent.createChooser(intent, "Open folder"));
how can I open it by default file manager ?

Unable to open excel file on Android using Intent.ACTION_VIEW

I'm trying to let a user export an excel file in my app and have the app automatically open the created excel file. The excel file is created and stored successfully using jxl, but when I try to open it with the Hancom Office Editor nothing happens other than my screen getting a dark overlay. Here's a gif:
I can't figure out what would cause this and can't find anything about it online.
I'm using the accepted answer from here to support my target SDK 28.
my export method:
public void onExport(View view){
try {
//write changes to excel file(changes made outide of function)
workbook.write();
workbook.close();
Toast.makeText(getApplication(),
"Data Exported to Excel Sheet", Toast.LENGTH_SHORT).show();
findViewById(R.id.btn_export).setEnabled(false);
//set file to saved excel file
File file = new File(Environment.getExternalStorageDirectory(),
race.getName()+".xls");
Uri path = FileProvider.getUriForFile(getApplicationContext(), "com.something.racecalculator.fileprovider", file);
Intent intent = new Intent(Intent.ACTION_VIEW);
Log.i("path: ", path.toString());
intent.setDataAndType(path, "image/jpg");
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
} catch (IOException e) {
e.printStackTrace();
} catch (WriteException e) {
e.printStackTrace();
}
catch (ActivityNotFoundException e) {
Log.i("oh no:", "No application available to view excel");
}
}
My provider tag in AndroidManifest.xml(set as a child of ):
<provider
android:name=".GenericFileProvider"
android:authorities="com.something.racecalculator.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="#xml/provider_paths"/>
</provider>
I'm not getting any Errors or warnings as far as I can tell. Thanks for any help.

I'm not sure exactly what caused the problem, however, I suspect that I might have had the file path wrong. I changed a couple things (including where the excel files were being saved to. Changed from /storage/emulated/0/ to /storage/emulated/0/Samsung) and here is what worked:
Intent intent = new Intent(Intent.ACTION_VIEW);
File file = new File("/storage/emulated/0/Samsung"+File.separator + race.getName()+".xls");
Uri path = FileProvider.getUriForFile(getApplicationContext(), "com.something.racecalculator.fileprovider", file);
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
intent.setDataAndType(path, "application/vnd.ms-excel");
startActivity(intent);
remember that you need to implement a FileProvider if your target SDK is 24 or above

Open HashTag page with native Facebook-App

I want to open the HashTag-Page with the native facebook app.
This code works fine when opening profiles:
String facebookScheme = "fb://profile/" + facebookId;
Intent facebookIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(facebookScheme));
startActivity(facebookIntent);
But how to open HashTags like this?
https://www.facebook.com/hashtag/audi