Develop Reference

How do I use jetbrains exposed with android contentResolver/Mediastore

Im trying to make a simple android mediaplayer app that can be controlled from a distance. At the moment I'm trying to fix the issue of sending all the information on artists/albums/songs that are on the phone. At the moment I'm retrieving all the information as such:
private val contentResolver = activity.contentResolver!!
fun getAll():Set<Album>{
val res = mutableSetOf<Album>()
val cursor = contentResolver.query(MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI,
arrayOf(
MediaStore.Audio.Albums.ALBUM,
MediaStore.Audio.Albums.ALBUM_ART,
MediaStore.Audio.Albums.NUMBER_OF_SONGS,
MediaStore.Audio.Albums.ARTIST)
,null,null)
if(cursor!!.moveToFirst())
do {
res.add(Album().apply {
name = cursor.getString(0)
if (!cursor.getString(1).isNullOrEmpty())
albumArtUri = Uri.parse(cursor.getString(1))
songCount = cursor.getInt(2)
artist = Artist().apply {
name = cursor.getString(3)
}
})
cursor.moveToNext()
}while (!cursor.isAfterLast)
cursor.close()
return res
}
Seeing that I'm using a cursor, I thought I was working with a kind of database (SQLite or so) As you can see, this is a lot of code for just a set of objects with little information; the album objects created don't have the songs in them. For this you'd need to start a new query, starting and a new URI. Now I thought I could use an ORM. So I can actually fill the album objects with a list of songs and so on. I decided to try Jetbrains Exposed, typed:
val database = Database.connect(....)
and I'm at a loss, I don't know how to connect to this the database. I can't seem to find any examples on how to start with this.

Exposed is for JDBC. ContentResolver is not using JDBC, and the Cursor is not an object from JDBC. In general, Android does not use JDBC, in apps or at the OS level.

How to retrieve and display Contact Name with corresponding SMS body in Android app?

Thanks in advance for your help.
I would like to make an activity that would look similar to the starting activity of native android messaging app: contact image, contact name, first few words of the message body.
So far with the help of this website I could figure out how to retrieve Senders phone numbers in a list view. Here is a part of the code I am using:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
List<SMSData> smsList = new ArrayList<SMSData>();
Uri uri = Uri.parse("content://sms/inbox");
Cursor c = getContentResolver().query(uri, null, null, null, null);
if (c.moveToFirst()) {
for (int i = 0; i < c.getCount(); i++) {
SMSData sms = new SMSData();
sms.setBody(c.getString(c.getColumnIndexOrThrow("body"))
.toString());
sms.setNumber(c.getString(c.getColumnIndexOrThrow("address"))
.toString());
smsList.add(sms);
c.moveToNext();
}
}
c.close();
setListAdapter(new ListAdapter(this, smsList));
My question is, how to retrieve and display Contact Name with corresponding SMS body???
The closest solution I found so far is this, but I cannot figure out how to put together my code and this solution.

Have you added proper permissions needed for doing this operation in your manifest? i.e
needed for that to be in your manifest for that operation, read these tutorial and download source code available and try that
http://www.technotalkative.com/android-fetch-inbox-sms/
Hope that it will work....

After looking more closer this example actually helped me.
Thanks to everyone

Retrieve Contact name from phone number

I've been looking everywhere since the past few days to find a way to retrieve a contact name using a phone number I already have stored in a variable, unfortunately everything I found so far seems to be using deprecated functions/calls.
Of Course, I tried doing it my own way but I feel like my Android/JAVA knowledge is not good enough to understand this concept yet, keep getting some errors or force close when I try to run anything.
So far the best thing I could find was something like this:
public String getContactName(final String phoneNumber)
{
Uri uri;
String[] projection;
if (Build.VERSION.SDK_INT >= 5)
{
uri = Uri.parse("content://com.android.contacts/phone_lookup");
projection = new String[] { "display_name" };
}
else
{
uri = Uri.parse("content://contacts/phones/filter");
projection = new String[] { "name" };
}
uri = Uri.withAppendedPath(uri, Uri.encode(phoneNumber));
Cursor cursor = context.getContentResolver().query(uri, projection, null, null, null);
String contactName = "";
if (cursor.moveToFirst())
{
contactName = cursor.getString(0);
}
cursor.close();
cursor = null;
return contactName;
}
But by using this code, Eclipse tells me: context cannot be resolved.
A lot of the codes and explanations I found were using this Context thing, but I still don't understand it even after reading this: What is 'Context' on Android?
Any help will be greatly appreciated,
Thank you very much

If you're using this inside an activity, then a context is what you get by using this. So basically here, instead of calling context.getContentResolver(), call this.getContentResolver() or simply just getContentResolver().
Eclipse complains basically because you're trying to call a method of something called context which Eclipse doesn't know because it hasn't been declared anywhere. It would work if you previously did something like Context context = this;, but that's really useless.
getContentResolver() is a method declared and defined by Activity which is a class that your activity extends, therefore you can call it just like that.
I hope it helps. As to what this context really is, I am sorry, but I can't help you with that as I am not even sure I understand it correctly.
Also, please notice, that I haven't checked the code you posted and I don't know if it works for obtaining a contact's name from a phone number. Just wanted to help you with getting rid of the context cannot be resolved error.

Android's Media Scanner: How do I remove files?

I'm writing an app that removes files that may or may not be listed in any one of the types of media libraries such as music or pictures. While I can use the MediaScannerConnection.scanFile method to add files to the media library there doesn't seem to be any call to notify the service that the file has been removed. Sending it the path of the file that no longer exists doesn't result in the desired behavior either. How should I go about removing items from the library that no longer exist on the Android storage?

I was able to put a method together using bits and pieces from these two questions
What is the String 'volumeName' argument of MediaStore.Audio.Playlists.Members.getContentUri referring to?
How can I refresh MediaStore on Android?
Basically I just run a query on each one of the MediaStore types (Audio, Video and Images) selecting by path and deleting any records I find.
public static void RemoveAllForPaths(String[] paths, Context context)
{
private static final String[] FIELDS = { MediaStore.MediaColumns._ID, MediaStore.MediaColumns.DATA, MediaStore.MediaColumns.TITLE };
if(paths == null || paths.length == 0) return;
String select = "";
for(String path : paths)
{
if(!select.equals("")) select += " OR ";
select += MediaStore.MediaColumns.DATA + "=?";
}
Uri uri;
Cursor ca;
uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
ca = context.getContentResolver().query(uri, FIELDS, select, paths, null);
for(ca.moveToFirst(); !ca.isAfterLast(); ca.moveToNext()){
int id = ca.getInt(ca.getColumnIndex(MediaStore.MediaColumns._ID));
uri = ContentUris.withAppendedId(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, id);
context.getContentResolver().delete(uri, null, null);
}
ca.close();
// More of the same just setting the URI to Video and Images
}
I'm not entirely sure how safe this is to do but it's the only solution I've found so far and some initial testing seems to be working. I invite others to submit other answers if anyone has any further information on this approach or a better method for performing this functionality.

Answer of Spencer Ruport is right, but you don't need to query and open a cursor in order to delete.
So for one file that is music file the code is simple like that:
public void DeleteMP3FromMediaStore( Context context, String path )
{
Uri rootUri = MediaStore.Audio.Media.getContentUriForPath( path );
context.getContentResolver().delete( rootUri,
MediaStore.MediaColumns.DATA + "=?", new String[]{ path } );
}
P.S. I wanted to comment answer of Spencer Ruport but don't have enough reputation yet.

Easy as pie: whenever you add a file, let MediaStore ContentProvider knows about it using
sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(fileToAddInMediaStore)));
For deletion: just use
getContentResolver().delete(Uri.fromFile(fileToDeleteFromMediaStore), null, null)

The following works well for me. You can delete or add files using this.
MediaScannerConnection.scanFile(
context,
new String[]{fileToDelete, fileToAdd},
null, null);

The available method is to remove the item from library.
This post is detailed expressed how to add into or remove from the Media Library.
http://androidyue.github.io/blog/2014/01/19/scan-media-files-in-android/ Hopes this could help you.

How to display images from SD card in a GalleryView

I am trying to display all the images stored in SD card in a Gallery View.
I have tried using the content provider (android.provider.MediaStore.images.Media class), but seem to be getting stuck at a point. Not sure if this is the way to go about it.
Here is my code so far:
String[] colsNeeded = new String[]{Media._ID, Media.TITLE};
Uri mMedia = Media.EXTERNAL_CONTENT_URI;
//Create a cursor using the URI & column names needd
Cursor c = managedQuery(mMedia, colsNeeded, null, null, Media.DATE_TAKEN + " ASC");
//What kind of adapter should I create here
//that contains images from the cursor??
SpinnerAdapter sa = null; //This is the point I get stuck
//Set the adapter of the gallery view
Gallery galleryPetPhotos = (Gallery)findViewById(R.id.GalleryPetPhotos);
galleryPetPhotos.setAdapter(sa);
Just a nudge in the right direction would be greatly appreciated.

This blog post has a good example on that. It shows you how to do the adapter: http://mihaifonoage.blogspot.com/2009/09/displaying-images-from-sd-card-in.html
However I would be extending a CursorAdapter instead of a BaseAdapter.