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How to open a file in external storage from an application? (Android)

I've added a button to my application which is supposed to open the download folder of the phone, and from there you should be able to click on files that were stored there, from the same app. Right now im saving some data there.
Problem is; I cant open the saved files in the folder.
I can see the files stored right there, but when I press one of them you immediatley go back to the app and not the file that you pressed.
Is there something I'm missing? Are you not supposed to open files stored in external storage from another app?
I've tried adding permissions in manifest and checkSelfpermission for checks in runtime, but with no success.
Here's the button for opening download folder:
private void openSavedLocation(){
if (ContextCompat.checkSelfPermission(ExportAndImport.this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)
{
ActivityCompat.requestPermissions(ExportAndImport.this, new String[] {Manifest.permission.READ_EXTERNAL_STORAGE}, 1);
}
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
Uri uri = Uri.parse(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getPath());
intent.setDataAndType(uri, "text/xml");
startActivity(Intent.createChooser(intent, "Open Folder"));}
I can open the file perfectly when Im opening it outside the app, not via this "createChooser". What could i be missing?
Any help is appreciated.

but when I press one of them you immediatley go back to the app and not the file that you pressed
That is what your code does. ACTION_GET_CONTENT says "let the user pick a piece of content". It does not say "open that piece of content in some other app". There is no single Intent action for saying "let the user pick a piece of content, then open that piece of content in some other app".
Is there something I'm missing?
If you want to try to open the XML in some other app:
Use startActivityForResult(), not startActivity(), for your ACTION_GET_CONTENT request (and get rid of the createChooser() bit)
Override onActivityResult() to get the result of the user's choice
If the user chose something (i.e., you get RESULT_OK in onActivityResult()), create an ACTION_VIEW Intent wrapped around the Uri that you get from the Intent passed into onActivityResult(), and call startActivity() on the ACTION_VIEW Intent
If, instead, your objective is to open this XML in your app, you would:
Use startActivityForResult(), not startActivity(), for your ACTION_GET_CONTENT request (and get rid of the createChooser() bit)
Override onActivityResult() to get the result of the user's choice
If the user chose something (i.e., you get RESULT_OK in onActivityResult()), get the Uri of the content from the Intent passed into onActivityResult(), then use ContentResolver to do something useful with that Uri (e.g., openInputStream() to read in the content)
Here's the button for opening download folder
ACTION_GET_CONTENT uses the MIME type. It will not necessarily honor your supplied starting Uri.

Android open external IMDB application from my app

I have a button in my application which opens the imdb application in the phone with a imdb id I received from https://developers.themoviedb.org/3/getting-started/introduction
But I couldnt find anyway(using intents) to make my app recognize the imdb app and open it and if imdb app do not exist then I want to open the web site. How can I accomplish this?

I think I may be able to point you in the right direction. Just to be sure, you seem to be using TMDB but wish to open in the IMDB app?
The code below is from the Android documentation.
It will start your intent if the package manager can find an app with the appropriate intent filter installed on your device. If multiple apps are able to open this intent then an app chooser should pop up, unless the user has previously set a default for this kind of URI.
Intent sendIntent = new Intent(Intent.ACTION_SEND);
// Always use string resources for UI text.
// This says something like "Share this photo with"
String title = getResources().getString(R.string.chooser_title);
// Create intent to show the chooser dialog
Intent chooser = Intent.createChooser(sendIntent, title);
// Verify the original intent will resolve to at least one activity
if (sendIntent.resolveActivity(getPackageManager()) != null) {
startActivity(chooser);
}
If you add an else onto that then you can use a view intent like this :
Intent internetIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(movieUrl));
//Watch out here , There is a URI and Uri class!!!!
if (internetIntent.resolveActivity(getPackageManager()) != null){
startActivity(internetIntent);
}
I also found this (rather old) post about calling an explicit imdb uri
Imdb description
startActivity(android.intent.action.VIEW, imdb:///title/<titleID>);
// take note of the Uri scheme "imdb"
I hope this helps. If you post some more detail , code, links , I might be able to work through this with you.
If my answer is way off base then please be kind and set me right. We are all learning every day!
Good Luck.

Why doesn't PackageInstallerActivity work with Intent.ACTION_VIEW

I used the following code to launch PackageInstallerActivity
ComponentName comp = new ComponentName("com.android.packageinstaller", "com.android.packageinstaller.PackageInstallerActivity");
Intent newIntent = new Intent(Intent.ACTION_VIEW);
newIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
newIntent.setComponent(comp);
But in Marshmallow, that's not working.
I found the answer, use Intent.ACTION_INSTALL_PACKAGE instead of Intent.ACTION_VIEW.
But, why does Intent.ACTION_VIEW not work?

Look this link Android Document REQUEST_INSTALL_PACKAGES, If your app is targeting API level higher than 25 you need to hold REQUEST_INSTALL_PACKAGES in order to launch the application installer.

Share my app via specific apps only

I want to create a sharing button via some applications only.
right now I`m using this code:
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_SUBJECT, "App Name");
intent.putExtra(Intent.EXTRA_TEXT, "Check out this cool app http://market.android.com/details?id=com.example.yourpackagename");
Intent chooser = Intent.createChooser(intent, "Tell a friend about App Name");
startActivity(chooser);
But it opens a huge window with all the apps installed at the device. I want to show only chosen options (Facebook, Whatsapp, Gmail).
Thank you.

Have a look at this answer, I would suggest going with it : https://stackoverflow.com/a/9755553/1542720
Some other workarounds/solutions :
http://hkdevtips.blogspot.in/2013/02/customize-your-actionchooser-intent.html
Custom filtering of intent chooser based on installed Android package name

send mms without user interaction in android

Intent intent = new Intent(Intent.ACTION_SENDTO);
intent.putExtra("address", "12134567899");
intent.putExtra("sms_body", "See attached picture");
intent.putExtra(Intent.EXTRA_STREAM,
Uri.parse("file:///sdcard/DCIM/Camera/2011-09-09 12.47.29.jpg"));
intent.setType("image/png");
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
i try code like this. if intent start mms compose ui was coming how can i overcome and send automatically

First of all. good luck.
Since MMS isn't supported by the android sdk, you have 2 options:
download the android mms aplication and try to understand what's going on there.
follow this link:
http://androidbridge.blogspot.com/2011/03/how-to-send-mms-programmatically-in.html
only thing I found working at the moment....

This feature was designed as a safety feature in Android, please do not try to bypass it. It's there for a reason.
If you absolutly must, have you tried running it on a rooted device? It allows greater access.

try this its worked with me .
use
Uri.fromFile
instead of
Uri.parse
File f=new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/DCIM/Camera/"+img_name);
Intent sendIntent = new Intent(Intent.ACTION_SEND);
sendIntent.putExtra("", "");
sendIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(f));
sendIntent.setType("image/png");
startActivity(sendIntent);