Develop Reference

How to fetch all pdf file from all directories in my Android app

I want to know how to fetch all PDF files from internal storage. Files can be in any directory, like some in DCIM folders or some in Downloads folder, and so on and so forth.
Note: I am using Android Studio (language: Java).

i have search almost all the ans but it was not working in Android 11. so i have a short solution for picking up all file for example image, video, pdf, doc, audio etc. there was a github library which was recently created
Click [here] https://github.com/HBiSoft/PickiT
and if you want to do all this without dependency
Code Below
do it in orderwise
var mimeTypes = arrayOf(
"application/msword",
"application/vnd.openxmlformats-officedocument.wordprocessingml.document", // .doc & .docx
"application/vnd.ms-powerpoint",
"application/vnd.openxmlformats-officedocument.presentationml.presentation", // .ppt & .pptx
"application/vnd.ms-excel",
"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", // .xls & .xlsx
"application/pdf"
)
findViewById<Button>(R.id.btnclick).setOnClickListener {
val intent = Intent(Intent.ACTION_OPEN_DOCUMENT).apply {
addCategory(Intent.CATEGORY_OPENABLE)
type = "*/*"
putExtra(Intent.EXTRA_MIME_TYPES, mimeTypes);
// mimeTypes = mimeTypes
}
startActivityForResult(intent, 100)
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
Log.e(">>>>>>", "check")
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
getFile(this,intentToDocumentFiles(data)[0])
}
}
private fun intentToDocumentFiles(intent: Intent?): List<DocumentFile> {
val uris = intent?.clipData?.run {
val list = mutableListOf<Uri>()
for (i in 0 until itemCount) {
list.add(getItemAt(i).uri)
}
list.takeIf { it.isNotEmpty() }
} ?: listOf(intent?.data ?: return emptyList())
return uris.mapNotNull { uri ->
if (uri.isDownloadsDocument && Build.VERSION.SDK_INT < 28 && uri.path?.startsWith("/document/raw:") == true) {
val fullPath = uri.path.orEmpty().substringAfterLast("/document/raw:")
DocumentFile.fromFile(File(fullPath))
} else {
fromSingleUri(uri)
}
}.filter { it.isFile }
}
#RequiresApi(Build.VERSION_CODES.R)
fun getFile(context: Context, document: DocumentFile): File? {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
return null
}
try {
val volumeList: List<StorageVolume> = context
.getSystemService(StorageManager::class.java)
.getStorageVolumes()
if (volumeList == null || volumeList.isEmpty()) {
return null
}
// There must be a better way to get the document segment
val documentId = DocumentsContract.getDocumentId(document.uri)
val documentSegment = documentId.substring(documentId.lastIndexOf(':') + 1)
for (volume in volumeList) {
val volumePath: String
if (Build.VERSION.SDK_INT == Build.VERSION_CODES.Q) {
val class_StorageVolume = Class.forName("android.os.storage.StorageVolume")
val method_getPath: Method = class_StorageVolume.getDeclaredMethod("getPath")
volumePath=method_getPath.invoke(volume).toString()
} else {
// API 30
volumePath=volume.directory!!.path
}
val storageFile = File(volumePath + File.separator + documentSegment)
// Should improve with other checks, because there is the
// remote possibility that a copy could exist in a different
// volume (SD-card) under a matching path structure and even
// same file name, (maybe a user's backup in the SD-card).
// Checking for the volume Uuid could be an option but
// as per the documentation the Uuid can be empty.
val isTarget = (storageFile.exists()
&& storageFile.lastModified() == document.lastModified()
&& storageFile.length() == document.length())
if (isTarget) {
Log.e(">>>>>>>",storageFile.absolutePath)
return storageFile
}
}
} catch (e: Exception) {
e.printStackTrace()
}
Log.e(">>>>>>>","null")
return null
}

You can use MediaStore to fetch all PDF Files ,this is an example how to get all your PDF files :
protected ArrayList<String> getPdfList() {
ArrayList<String> pdfList = new ArrayList<>();
Uri collection;
final String[] projection = new String[]{
MediaStore.Files.FileColumns.DISPLAY_NAME,
MediaStore.Files.FileColumns.DATE_ADDED,
MediaStore.Files.FileColumns.DATA,
MediaStore.Files.FileColumns.MIME_TYPE,
};
final String sortOrder = MediaStore.Files.FileColumns.DATE_ADDED + " DESC";
final String selection = MediaStore.Files.FileColumns.MIME_TYPE + " = ?";
final String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension("pdf");
final String[] selectionArgs = new String[]{mimeType};
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
collection = MediaStore.Files.getContentUri(MediaStore.VOLUME_EXTERNAL);
}else{
collection = MediaStore.Files.getContentUri("external");
}
try (Cursor cursor = getContentResolver().query(collection, projection, selection, selectionArgs, sortOrder)) {
assert cursor != null;
if (cursor.moveToFirst()) {
int columnData = cursor.getColumnIndex(MediaStore.Files.FileColumns.DATA);
int columnName = cursor.getColumnIndex(MediaStore.Files.FileColumns.DISPLAY_NAME);
do {
pdfList.add((cursor.getString(columnData)));
Log.d(TAG, "getPdf: " + cursor.getString(columnData));
//you can get your pdf files
} while (cursor.moveToNext());
}
}
return pdfList;
}

This is improvised answer of #Shay Kin.
As we know in latest android versions we have many restrictions to access files in external storage.
MediaStore api and Storage Access Framework apis provides access to shared files. This is explained clearly in this video.
Coming to the answer, in Shay Kin's answer we can able to fetch all pdf files which are there in the shared files but ignores downloads.
Permissions required
READ_EXTERNAL_STORAGE
if api is Q plus you also need MANAGE_EXTERNAL_STORAGE
please find the below code to fetch all pdf files.
protected List<String> getPdfList() {
List<String> pdfList = new ArrayList<>();
final String[] projection = new String[]{
MediaStore.Files.FileColumns.DISPLAY_NAME,
MediaStore.Files.FileColumns.DATE_ADDED,
MediaStore.Files.FileColumns.DATA,
MediaStore.Files.FileColumns.MIME_TYPE,
};
final String sortOrder = MediaStore.Files.FileColumns.DATE_ADDED + " DESC";
final String selection = MediaStore.Files.FileColumns.MIME_TYPE + " = ?";
final String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension("pdf");
final String[] selectionArgs = new String[]{mimeType};
Uri collection = MediaStore.Files.getContentUri("external");
pdfList.addAll(getPdfList(collection, projection, selection, selectionArgs, sortOrder));
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
collection = MediaStore.Downloads.getContentUri("external");
pdfList.addAll(getPdfList(collection,projection, selection, selectionArgs, sortOrder));
}
return pdfList;
}
private List<String> getPdfList(Uri collection, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
List<String> pdfList = new ArrayList<>();
try (Cursor cursor = getContentResolver().query(collection, projection, selection, selectionArgs, sortOrder)) {
assert cursor != null;
if (cursor.moveToFirst()) {
int columnData = cursor.getColumnIndex(MediaStore.Files.FileColumns.DATA);
do {
pdfList.add((cursor.getString(columnData)));
Log.d(TAG, "getPdf: " + cursor.getString(columnData));
//you can get your pdf files
} while (cursor.moveToNext());
}
}
return pdfList;
}
Hope this works.

Get Contact Name through contact number not work in Android 9.0 Pie

I want to get the name for incoming call number from contact list through the following method. it work on all android version but it give null in android 9.0 pie.
private String getContactName(String number, Context context) {
String contactName = "";
String[] projection = new String[] {
ContactsContract.PhoneLookup.DISPLAY_NAME,
ContactsContract.PhoneLookup.NUMBER,
ContactsContract.PhoneLookup.HAS_PHONE_NUMBER };
Uri contactUri = Uri.withAppendedPath(
ContactsContract.PhoneLookup.CONTENT_FILTER_URI,
Uri.encode(number));
Cursor cursor = context.getContentResolver().query(contactUri,
projection, null, null, null);
if(cursor != null) {
if (cursor.moveToFirst()) {
contactName = cursor.getString(cursor
.getColumnIndex(ContactsContract.PhoneLookup.DISPLAY_NAME));
}
cursor.close();
}
return contactName.equals("") ? number : contactName;
}
i also try a new method but it also not working and give me null value. i get this code from google developer documentation. whats wrong with my code or please help me on which method i can get contact name for a number.
public String onCreateIncomingConnection (String s) {
// Get the telephone number from the incoming request URI.
String phoneNumber = s;
String displayName = "Unknown caller";
boolean isCallerInWorkProfile = false;
// Look up contact details for the caller in the personal and work profiles.
Uri lookupUri = Uri.withAppendedPath(
ContactsContract.PhoneLookup.ENTERPRISE_CONTENT_FILTER_URI,
Uri.encode(phoneNumber));
Cursor cursor = getContentResolver().query(
lookupUri,
new String[]{
ContactsContract.PhoneLookup._ID,
ContactsContract.PhoneLookup.DISPLAY_NAME,
ContactsContract.PhoneLookup.CUSTOM_RINGTONE
},
null,
null,
null);
// Use the first contact found and check if they're from the work profile.
if (cursor != null) {
try {
if (cursor.moveToFirst() == true) {
displayName = cursor.getString(1);
isCallerInWorkProfile =
ContactsContract.Contacts.isEnterpriseContactId(cursor.getLong(0));
}
} finally {
cursor.close();
}
}
// Return a configured connection object for the incoming call.
// MyConnection connection = new MyConnection();
// connection.setCallerDisplayName(displayName, TelecomManager.PRESENTATION_ALLOWED);
//
// Our app's activity uses this value to decide whether to show a work badge.
// connection.setIsCallerInWorkProfile(isCallerInWorkProfile);
// Configure the connection further ...
return displayName;
}

Ormlite query takes time in Android

I am working in Android application in which I am using ormlite. I am taking my phone book contacts and saving them in my local database, but the problem is that it is taking too much time like for almost 1500 contact it is taking almost 70 seconds.
I searched for the Bulk insert in ormlite, but I can't figure it out how to implement it in my following code.
public static void loadLocalPhoneBookSample(Context ctx) {
try{
ContentResolver contentRes = ctx.getContentResolver();
Cursor cur = null;
String selection = ContactsContract.Contacts.HAS_PHONE_NUMBER;
cur = contentRes.query(ContactsContract.Contacts.CONTENT_URI, PROJECTIONS, selection, null, Phone.DISPLAY_NAME + " ASC");
context = ctx;
if (cur.getCount() > 0) {
// create DB object
MUrgencyDBHelper db = new MUrgencyDBHelper(ctx);
RuntimeExceptionDao<ContactLocal, ?> contactDAO = db.getContactLocalIntDataDao();
UpdateBuilder<ContactLocal, ?> updateDAO = contactDAO.updateBuilder();
try {
updateDAO.updateColumnValue("isUseless", true);
updateDAO.update();
} catch (SQLException e) {
e.printStackTrace();
}finally {
// db.writeUnlock();
}
while (cur.moveToNext()) {
String id = cur.getString(cur.getColumnIndex(ContactsContract.Contacts._ID));
/** read names **/
String displayName = cur.getString(cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
/** Phone Numbers **/
Cursor pCur = contentRes.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null, ContactsContract.CommonDataKinds.Phone.CONTACT_ID
+ " = ?", new String[] { id }, null);
while (pCur.moveToNext()) {
String number = pCur
.getString(pCur
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
String formatedNo = number.replaceAll("\\s+", "").replace("+", "00").replace("-", "").trim();
try {
QueryBuilder<ContactLocal, ?> query = contactDAO.queryBuilder();
query.where().eq("mFormatedNumber", number);
ContactLocal contact = query.queryForFirst();
boolean addContact = false, alreadyUpdated = true;
if (contact == null) {
addContact = true;
contact = new ContactLocal();
contact.setFirstName(displayName.trim());
contact.setLastName(displayName.trim());
contact.setContactNumber(formatedNo);
}
// check if this contact was already updated before
if (contact.getContactNumber() == null || contact.getContactNumber().length() == 0) {
contact.setContFirstLastNo(number, displayName, displayName, number);
alreadyUpdated = false;
}
contact.setUseless(false);
// if not updated already, Create/Update
if (addContact) {
contactDAO.create(contact);
} else
contactDAO.update(contact);
}
}
pCur.close();
}
}
}

the problem is that it is taking too much time like for almost 1500 contact it is taking almost 70 seconds
#CarloB has the right answer in terms of doing the mass creates inside the dao. callBatchTasks(...) method. Here's the docs on that subject:
http://ormlite.com/docs/batch
To make things a bit faster, you could also go through and record all of the mFormatedNumber in another List and then query for them using an IN query. Use a raw in query to get back the mFormatedNumber that are already in the database:
results = dao.queryRaw(
"SELECT mFormatedNumber from Contact WHERE mFormatedNumber IN ?",
mFormatedNumberList);
For using raw queries with ORMLite, see:
http://ormlite.com/docs/raw-queries
So then you would make one query to see which of the contacts need to be created and then do all of the inserts from within a batch transaction.
Otherwise you are doing ~3000 synchronous database transactions and 40/sec on an Android device is unfortunately pretty typical.

Here is my revised version (might need a few syntax changes)
public static void loadLocalPhoneBookSample(Context ctx) {
try {
ContentResolver contentRes = ctx.getContentResolver();
String selection = ContactsContract.Contacts.HAS_PHONE_NUMBER;
Cursor cur = contentRes.query(ContactsContract.Contacts.CONTENT_URI, PROJECTIONS, selection, null, Phone.DISPLAY_NAME + " ASC");
context = ctx;
if (cur.getCount() > 0) {
// create DB object
MUrgencyDBHelper db = new MUrgencyDBHelper(ctx);
RuntimeExceptionDao<ContactLocal, ?> contactDAO = db.getContactLocalIntDataDao();
UpdateBuilder<ContactLocal, ?> updateDAO = contactDAO.updateBuilder();
try {
updateDAO.updateColumnValue("isUseless", true);
updateDAO.update();
} catch (SQLException e) {
e.printStackTrace();
}finally {
// db.writeUnlock();
}
ArrayList<ContactLocal> contacts = new ArrayList<>();
while (cur.moveToNext()) {
String id = cur.getString(cur.getColumnIndex(ContactsContract.Contacts._ID));
/** read names **/
String displayName = cur.getString(cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
/** Phone Numbers **/
Cursor pCur = contentRes.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null, ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?", new String[] { id }, null);
while (pCur.moveToNext()) {
String number = pCur.getString(pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
String formatedNo = number.replaceAll("\\s+", "").replace("+", "00").replace("-", "").trim();
try {
QueryBuilder<ContactLocal, ?> query = contactDAO.queryBuilder();
query.where().eq("mFormatedNumber", number);
ContactLocal contact = query.queryForFirst();
if (contact == null) {
contact = new ContactLocal();
contact.setFirstName(displayName.trim());
contact.setLastName(displayName.trim());
contact.setContactNumber(formatedNo);
}
contact.setUseless(false);
contacts.add(contact);
}
}
pCur.close();
}
contactDao.callBatchTasks(new Callable<Void>() {
public Void call() throws Exception {
for (ContactLocal contact : contacts) {
contactDAO.createOrUpdate(contact);
}
}
});
}
}
The main optimization is to use callBatchTasks. From the ormlite documentation:
Databases by default commit changes after every SQL operation. This method disables this "auto-commit" behavior so a number of changes can be made faster and then committed all at once.
By creating an ArrayList and keeping track of the changes, you can use callBatchTasks to create/update at the end all in one shot.
Also I noticed that alreadyUpdated was never accessed, so it's safe to remove.
Also Dao has a createOrUpdate method which is the same as the addContact if statement you had before.

How to implement complex queries using a Content Provider?

I am asking this because I am not quite sure of how to work with Android Content Providers. I have a subset of my database with 8 tables and I need to create complex queries to get some of the data. My content provider works fine with simple queries. For example, I have a table Person on my PersonModel.java class and I get the data using:
String [] projection = {PersonModel.C_FIRST_NAME, PersonModel.C_LAST_NAME};
Cursor cursor = context.getContentResolver().query(
MyProvider.CONTENT_URI_PERSONS, projection, null,
null, null);
and it works perfectly.
On MyProvider I have a bunch of CONTENT_URI constants, on for each of my tables.
public class MyProvider extends ContentProvider {
MyDbHelper dbHelper;
SQLiteDatabase db;
private static final String AUTHORITY = "com.myapp.models";
//Paths for each tables
private static final String PATH_PROFILE_PICTURES = "profile_pictures";
private static final String PATH_PERSONS = "persons";
private static final String PATH_USERS = "users";
....
//Content URIs for each table
public static final Uri CONTENT_URI_PROFILE_PICTURES = Uri
.parse("content://" + AUTHORITY + "/" + PATH_PROFILE_PICTURES);
public static final Uri CONTENT_URI_PERSONS = Uri.parse("content://"
+ AUTHORITY + "/" + PATH_PERSONS);
public static final Uri CONTENT_URI_USERS = Uri.parse("content://"
+ AUTHORITY + "/" + PATH_USERS);
...
private static final int PROFILE_PICTURES = 1;
private static final int PROFILE_PICTURE_ID = 2;
private static final int PERSONS = 3;
private static final int PERSON_ID = 4;
private static final int USERS = 5;
private static final int USER_ID = 6;
private static final UriMatcher sURIMatcher = new UriMatcher(
UriMatcher.NO_MATCH);
static {
sURIMatcher.addURI(AUTHORITY, PATH_PROFILE_PICTURES, PROFILE_PICTURES);
sURIMatcher.addURI(AUTHORITY, PATH_PROFILE_PICTURES + "/#",
PROFILE_PICTURE_ID);
sURIMatcher.addURI(AUTHORITY, PATH_PERSONS, PERSONS);
sURIMatcher.addURI(AUTHORITY, PATH_PERSONS + "/#", PERSON_ID);
sURIMatcher.addURI(AUTHORITY, PATH_USERS, USERS);
sURIMatcher.addURI(AUTHORITY, PATH_USERS + "/#", USER_ID);
...
}
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
// Uisng SQLiteQueryBuilder instead of query() method
SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
// check if the caller has requested a column which does not exists
//checkColumns(projection);
int uriType = sURIMatcher.match(uri);
switch (uriType) {
case PROFILE_PICTURES:
queryBuilder.setTables(ProfilePictureModel.TABLE_PROFILE_PICTURE);
break;
case PROFILE_PICTURE_ID:
// Adding the ID to the original query
queryBuilder.appendWhere(ProfilePictureModel.C_ID + "="
+ uri.getLastPathSegment());
case PERSONS:
queryBuilder.setTables(PersonModel.TABLE_PERSON);
break;
case PERSON_ID:
// Adding the ID to the original query
queryBuilder.appendWhere(PersonModel.C_ID + "="
+ uri.getLastPathSegment());
case USERS:
queryBuilder.setTables(UserModel.TABLE_USER);
break;
case USER_ID:
// Adding the ID to the original query
queryBuilder.appendWhere(UserModel.C_ID + "="
+ uri.getLastPathSegment());
default:
throw new IllegalArgumentException("Unknown URI: " + uri);
}
db = dbHelper.getWritableDatabase();
Cursor cursor = queryBuilder.query(db, projection, selection,
selectionArgs, null, null, sortOrder);
// make sure that potential listeners are getting notified
cursor.setNotificationUri(getContext().getContentResolver(), uri);
}
That is a small part of my content provider. So my questions are:
1) How do I implement a rawQuery() in my content provider? or how do I use properly my queryBuilder?, let's say I want to execute this query using several tables, renaming them and also passing the p1.id as a parameter?
SELECT p1.first_name, p1_last_name
FROM Person p1, Person P2, Relationship r
WHERE p1.id = ? AND
p1.id = r.relative_id AND
p2.id = r.related_id;
I tried so by doing this: On my query() method (shown above) I have a new case, called GET_RELATIVES:
case GET_RELATIVES:
db = dbHelper.getWritableDatabase();
queryBuilder.setTables(PersonModel.TABLE_PERSON + " p1, "
+ PersonModel.TABLE_PERSON + " p2, "
+ RelationshipModel.TABLE_RELATIONSHIP + " r");
queryBuilder.appendWhere("p2."+PersonModel.C_ID + "=" + uri.getLastPathSegment());
queryBuilder.appendWhere("p2."+PersonModel.C_ID + "=" + "r.related_id");
queryBuilder.appendWhere("p1."+PersonModel.C_ID + "=" + "r.relative_id");
so I defined a new PATH, CONTENT URI and add it to the UriMatcher, like this:
private static final String PATH_GET_RELATIVES = "get_relatives";
public static final Uri CONTENT_URI_GET_RELATIVES = Uri
.parse("content://" + AUTHORITY + "/"
+ PATH_GET_RELATIVES);
private static final int GET_RELATIVES = 22;
private static final UriMatcher sURIMatcher = new UriMatcher(
UriMatcher.NO_MATCH);
static {
...
sURIMatcher.addURI(AUTHORITY, PATH_GET_RELATIVES, GET_RELATIVES);
}
but this does not seem to work so I think I'm probably defining something wrong on my content provider or inside the query method.
2) I am not quite sure what is the point on having for each table a constant called TABLE_ID and adding it to the switch-case. What is that used for? How do I call it?
Hope anyone can help me with this, thanks in advance!

I actually found the answer to my question in the most obvious place: the android documentation.
First Question: Implement a rawQuery. Did it like this:
Inside of my switch-case in the content provider I added a new URI, which for me is a JOIN between to tables, so I created a new ContentUri constant for it, a new ID, and registered it on the UriMatcher and then wrote the rawQuery. So MyProvider now looks a litte bit like this:
public class MyProvider extends ContentProvider {
...
// JOIN paths
private static final String PATH_RELATIONSHIP_JOIN_PERSON_GET_RELATIVES =
"relationship_join_person_get_relatives";
...
public static final Uri CONTENT_URI_RELATIONSHIP_JOIN_PERSON_GET_RELATIVES = Uri
.parse("content://" + AUTHORITY + "/"
+ PATH_RELATIONSHIP_JOIN_PERSON_GET_RELATIVES);
...
private static final int RELATIONSHIP_JOIN_PERSON_GET_RELATIVES = 21;
private static final UriMatcher sURIMatcher = new UriMatcher(
UriMatcher.NO_MATCH);
static {
...
//JOINS
sURIMatcher.addURI(AUTHORITY, PATH_RELATIONSHIP_JOIN_PERSON_GET_RELATIVES + "/#",
RELATIONSHIP_JOIN_PERSON_GET_RELATIVES);
...
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
// Uisng SQLiteQueryBuilder instead of query() method
SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
// check if the caller has requested a column which does not exists
//checkColumns(projection);
int uriType = sURIMatcher.match(uri);
switch (uriType) {
...
case RELATIONSHIP_JOIN_PERSON_GET_RELATIVES:
db = dbHelper.getWritableDatabase();
String[] args = {String.valueOf(uri.getLastPathSegment())};
Cursor cursor = db.rawQuery(
"SELECT p1.first_name, p1.last_name " +
"FROM Person p1, Person p2, Relationship r " +
"WHERE p1.id = r.relative_id AND " +
"p2.id = r.related_id AND " +
"p2.id = ?", args);
cursor.setNotificationUri(getContext().getContentResolver(), uri);
return cursor;
...
}
And to call the query() method and pass the id ad a parameter I did this in my controller:
String[] projection = { PersonModel.C_FIRST_NAME,
PersonModel.C_LAST_NAME };
Cursor cursor = context.getContentResolver().query(
ContentUris.withAppendedId(
AkdemiaProvider.CONTENT_URI_RELATIONSHIP_JOIN_PERSON_GET_RELATED, id),
projection, null, null, null);
Second question: Having the TABLE_ID constant is useful to have a query for each table passing an id as a parameter, I didn't know how to call the query method passing such id and this is how the Android Developer Documentation explains how to do so using ContentUris.withAppendedId
// Request a specific record.
Cursor managedCursor = managedQuery(
ContentUris.withAppendedId(Contacts.People.CONTENT_URI, 2),
projection, // Which columns to return.
null, // WHERE clause.
null, // WHERE clause value substitution
People.NAME + " ASC"); // Sort order.
I you guys want to see the whole documentation go to this link.
Hope this helps to anyone else having the same problem to understand ContentProvider, ContentUris and all that :)

Below code worked for me. Inside your Application's Content Provider:
public static final String PATH_JOIN_TWO_TABLES = "my_path";
public static final Uri URI_JOIN_TWO_TABLES =
Uri.parse("content://" + AUTHORITY + "/" + PATH_JOIN_TWO_TABLES);
private static final int ID_JOIN_TWO_TABLES = 1001;
private static final UriMatcher sURIMatcher = new UriMatcher(
UriMatcher.NO_MATCH);
static {
sURIMatcher.addURI(AUTHORITY,
PATH_JOIN_TWO_TABLES + "/#", ID_JOIN_TWO_TABLES );
}
#Nullable
#Override
public Cursor query(#NonNull Uri uri, String[] projection, String selection,String[] selectionArgs,
String sortOrder, CancellationSignal cancellationSignal) {
int uriType = sURIMatcher.match(uri);
switch (uriType) {
case ID_JOIN_TWO_TABLES:
return getWritableDatabase()
.rawQuery("select * from " +
"table_one" + " LEFT OUTER JOIN "
+ "table_two" + " ON ("
+ "table_one.ID"
+ " = " + "table_two.id" + ")", null);
}
return super.query(uri, projection, selection, selectionArgs, sortOrder, cancellationSignal);
}
And while making the Query inside your Activity or Fragment:
Cursor cursor = getActivity().getContentResolver()
.query(ContentUris.withAppendedId(MYContentProvider.URI_JOIN_TWO_TABLES, MyContentProvider.ID_JOIN_TWO_TABLES), null, null, null, null);
Hope it works for you.

For simple queries use selectionArgs in ContentProvider. It works like below
String[] args = { "first string", "second#string.com" };
Cursor cursor = db.query("TABLE_NAME", null, "name=? AND email=?", args, null);
Having the TABLE_ID inside the to create a different queries for each table.
Refer following class for all multiple table in content providers
Vogella Tutorial 1
Vogella Tutorial 2
Best practices for exposing multiple tables using content providers in Android

List all music in MediaStore with the PATHs

Ok so I've been working on this project for a few days now and most of my time has been working out how to list all the music on a device in a LIST VIEW or something else, I have searched for a few days now and this is killing me. I did get so close at one point with all the music in one folder showing, though since most people will have sub folders for things like artiest and albums I need a way to search sub folders for MP3s or music files.
Here is what I have so far for Music collection:
package com.androidhive.musicplayer;
import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.HashMap;
import android.provider.MediaStore;
public class SongsManager {
// SDCard Path
final String MEDIA_PATH = new String(MediaStore.Audio.Media.getContentUri("external").toString());
private ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
// Constructor
public SongsManager(){
}
/**
* Function to read all mp3 files from sdcard
* and store the details in ArrayList
* */
public ArrayList<HashMap<String, String>> getPlayList(){
File home = new File(MEDIA_PATH);
if (home.listFiles(new FileExtensionFilter()).length > 0) {
for (File file : home.listFiles(new FileExtensionFilter())) {
HashMap<String, String> song = new HashMap<String, String>();
song.put("songTitle", file.getName().substring(0, (file.getName().length() - 4)));
song.put("songPath", file.getPath());
// Adding each song to SongList
songsList.add(song);
}
}
// return songs list array
return songsList;
}
/**
* Class to filter files which are having .mp3 extension
* */
class FileExtensionFilter implements FilenameFilter {
public boolean accept(File dir, String name) {
return (name.endsWith(".mp3") || name.endsWith(".MP3"));
}
}
}
Thanks to anyone who can help. :)

Although, the post is old, for other people like me to get the idea of creating a list of music with their file path, I added the solution here. MediaStore.Audio.Media.DATA column actually contains media file path. You can get necessary information by using the following snippet:
ContentResolver cr = getActivity().getContentResolver();
Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
String selection = MediaStore.Audio.Media.IS_MUSIC + "!= 0";
String sortOrder = MediaStore.Audio.Media.TITLE + " ASC";
Cursor cur = cr.query(uri, null, selection, null, sortOrder);
int count = 0;
if(cur != null)
{
count = cur.getCount();
if(count > 0)
{
while(cur.moveToNext())
{
String data = cur.getString(cur.getColumnIndex(MediaStore.Audio.Media.DATA));
// Add code to get more column here
// Save to your list here
}
}
cur.close();
}

You can list all the music files using this code
//Some audio may be explicitly marked as not being music
String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0";
String[] projection = {
MediaStore.Audio.Media._ID,
MediaStore.Audio.Media.ARTIST,
MediaStore.Audio.Media.TITLE,
MediaStore.Audio.Media.DATA,
MediaStore.Audio.Media.DISPLAY_NAME,
MediaStore.Audio.Media.DURATION
};
cursor = this.managedQuery(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
projection,
selection,
null,
null);
private List<String> songs = new ArrayList<String>();
while(cursor.moveToNext()) {
songs.add(cursor.getString(0) + "||"
+ cursor.getString(1) + "||"
+ cursor.getString(2) + "||"
+ cursor.getString(3) + "||"
+ cursor.getString(4) + "||"
+ cursor.getString(5));
}
I have not tried this code, but it seems correct. You'll be on the right track with that.

I'm working on same project right now and already solved the problem.
You will need a custom class to store your songs data:
package YOUR_PACKAGE;
public class Songs
{
private long mSongID;
private String mSongTitle;
public Songs(long id, String title){
mSongID = id;
mSongTitle = title;
}
public long getSongID(){
return mSongID;
}
public String getSongTitle(){
return mSongTitle;
}
}
Then you have to define ArrayList in activity with List View which you will populate with data:
private ArrayList<Songs> arrayList;
and in onCreate:
arrayList = new ArrayList<Songs>();
Then you have to retrieve data from your device:
public void YOUR_METHOD_NAME(){
ContentResolver contentResolver = getContentResolver();
Uri songUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
Cursor songCursor = contentResolver.query(songUri, null, null, null, null);
if(songCursor != null && songCursor.moveToFirst())
{
int songId = songCursor.getColumnIndex(MediaStore.Audio.Media._ID);
int songTitle = songCursor.getColumnIndex(MediaStore.Audio.Media.TITLE);
do {
long currentId = songCursor.getLong(songId);
String currentTitle = songCursor.getString(songTitle);
arrayList.add(new Songs(currentId, currentTitle, currentArtist));
} while(songCursor.moveToNext());
}
}
Then call this method from onCreate:
YOUR_METHOD_NAME();
And finally you have to create custom adapter class, define this adapter in onCreate (in activity with ListView) and set this adapter on your ListView object.
I see that it was asked 3 years ago and the problem I think already solved, but maybe it will be usefull for someone. Thanks.

Here is a simple function who gives you all audio files in File Object.
public static List<File> getAllAudios(Context c) {
List<File> files = new ArrayList<>();
String[] projection = { MediaStore.Audio.AudioColumns.DATA ,MediaStore.Audio.Media.DISPLAY_NAME};
Cursor cursor = c.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, projection, null, null, null);
try {
cursor.moveToFirst();
do{
files.add((new File(cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA)))));
}while(cursor.moveToNext());
cursor.close();
} catch (Exception e) {
e.printStackTrace();
}
return files;
}