Content providers allow sharing of data between apps by providing a common interface to underlying data. They define a content URI that specifies the location of the data and can be queried to retrieve data in the form of a cursor. Apps must request necessary permissions to access private data from a content provider, such as READ_CONTACTS to read contact details. The content provider handles queries and returns results, which can then be processed by moving through the cursor row by row to access field values.

1. Content Providers
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Sourabh Sahu

2. ContentProvider
• Sharing Data between Different Apps

3. Content URIs
• To Query, we have to specify the query
string in the form of a URI which has
following format −
• <prefix>://<authority>/<data_type>/<id>
• Example content://contacts/people/5
• This is used to get the 5th
contact
from contact list

4. What you can do with
ContentProvider

5. How to Access Content Provider
• / Queries the user dictionary and returns results
• mCursor = getContentResolver().query(
• CONTENT_URI, // The content URI
to access table
• mProjection, // The columns to
return for each row
• mSelectionClause // Selection criteria
• mSelectionArgs, // Selection criteria
• mSortOrder); // The sort order for
the returned rows

6. Required Permissions
• <uses-permission
android:name="android.permission.READ_
CONTACTS">
• </uses-permission>

7. • // A "projection" defines the columns that will be
returned for each row
• String[] mProjection =
• {
• // ContactsContract data table data1 column
name
• ContactsContract.CommonDataKinds.Phone.N
UMBER
• };
•
Example

8. • /*
• * This defines a one-element String array
to contain the selection argument.
• */
• String[] mSelectionArgs = {""};
•
•

9. • // Remember to insert code here to check
for invalid or malicious input.
•
• // Constructs a selection clause that
matches the contact_id from data table.
• mSelectionClause =
ContactsContract.CommonDataKinds.Phon
e.CONTACT_ID + " = ?";

10. • // Get data for 1st record
• mSelectionArgs[0] = 1;
• // Does a query against the table and returns a Cursor
object
• mCursor = getContentResolver().query(
• ContactsContract.CommonDataKinds.Phone.CONTENT_
URI, // URI
• mProjection, // The columns to return for
each row
• mSelectionClause // Data for first contact
• mSelectionArgs, // first contact
• mSortOrder // The sort order for the
returned rows
• );
•
•

11. • // Some providers return null if an error occurs, others throw an
exception
• if (null == mCursor) {
• // Insert code here to handle the error. Be sure not to use the
cursor! You may want to
• // call android.util.Log.e() to log this error.
• // If the Cursor is empty, the provider found no matches
•

12. • } else if (mCursor.getCount() < 1) {
• // Insert code here to notify the user that the contact query
was unsuccessful. This isn’t necessarily
• // an error. You may want to offer the user the option to insert
a new row, or re-type the
• // search term.
• } else {
•
• // Insert code here to do something with the results
•
• // Moves to the next row in the cursor. Before the first
movement in the cursor, the
• // "row pointer" is -1, and if you try to retrieve data at that
position you will get an
• // exception.
•
•

13. • while (mCursor.moveToNext()) {
•
• // Gets the value from the column.
•
• phoneNumber = mCursor.getString(index);
•
• // Show phone number in Logcat
• Log.i("Phone"," Numbers : " + phoneNumber);
•
• // end of while loop
• }
•
• }

14. PERMISSION
• This will not work in android 6.0 and
above
• You have to explicitly request for
permissions

15. Check Whether contact read
permission is there or not
• // Here, thisActivity is the current activity
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.READ_CONTACTS)
!= PackageManager.PERMISSION_GRANTED) {
• //Not having permission
• }
• Else {
• //having permission
• }

16. If Not Requestion Permission
• ActivityCompat.requestPermissions(this,
new String[]
{Manifest.permission.READ_CONTACTS}
,
MY_PERMISSIONS_REQUEST_READ_C
ONTACTS);

17. Handle permission
• @Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[]
grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_READ_CONTACTS:
{
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] ==
PackageManager.PERMISSION_GRANTED) {
• //Read Cursor Now
• }
• }

18. Thank You
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