5. content providers
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This document provides steps to access and display contact data from the device's contacts provider on Android. It involves creating an Android project with a layout containing a TextView. The necessary READ_CONTACTS permission is added to the manifest. On create, contacts are queried and the first contact's name is displayed in the TextView. Finally, it suggests using a ListView instead of TextView to display multiple contacts.
![Step5. Addthe followingfunction.
private void getContacts() {
// Check the SDK version and whether the permission is already granted or not.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M &&
checkSelfPermission(Manifest.permission.READ_CONTACTS) !=
PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, 100);
//After this point you wait for callback in onRequestPermissionsResult(int,
String[], int[]) overriden method
} else {
// Android version is lesser than 6.0 or the permission is already granted.
ContentResolver cr = getContentResolver();
Cursor cur = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null, null, null, null);
if (cur.getCount() > 0) {
while (cur.moveToNext()) {
String id = cur.getString(
cur.getColumnIndex(ContactsContract.Contacts._ID));
String name = cur.getString(cur.getColumnIndex(
ContactsContract.Contacts.DISPLAY_NAME));
// display in the list view
contactView.setText(name);
if (cur.getInt(cur.getColumnIndex(
ContactsContract.Contacts.HAS_PHONE_NUMBER)) > 0) {
Cursor pCur = cr.query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " =
?",
new String[]{id}, null);
while (pCur.moveToNext()) {
String phoneNo = pCur.getString(pCur.getColumnIndex(
ContactsContract.CommonDataKinds.Phone.NUMBER));
}
pCur.close();
}
}
}
}
}
6. Use ListViewinsteadof TextViewto displaycontacts](https://image.slidesharecdn.com/5-171028182412/85/5-content-providers-2-320.jpg)
5. content providers
- 1. Content Providers. Step 1. Create a new Android Project of blank Activity. Step 2. Add the following code to your layout/layout_activity.xml. <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:id="@+id/contactview" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout> Step3. Access to thecontact ContentProvider requires a certain permission, as not all applications should haveaccess to thecontact information. Open the AndroidManifest.xml file, and select thePermissions tab. On that tab click the Add button, and select the Uses Permission. From thedrop-down list select the android.permission.READ_CONTACTS entry <uses-permission android:name="android.permission.READ_CONTACTS"></uses-permission> Step 4. Add the following code on the“oncreate” method of your activity TextView contactView = (TextView) findViewById(R.id.contactview);
- 2. Step5. Addthe followingfunction. private void getContacts() { // Check the SDK version and whether the permission is already granted or not. if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && checkSelfPermission(Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) { requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, 100); //After this point you wait for callback in onRequestPermissionsResult(int, String[], int[]) overriden method } else { // Android version is lesser than 6.0 or the permission is already granted. ContentResolver cr = getContentResolver(); Cursor cur = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null); if (cur.getCount() > 0) { while (cur.moveToNext()) { String id = cur.getString( cur.getColumnIndex(ContactsContract.Contacts._ID)); String name = cur.getString(cur.getColumnIndex( ContactsContract.Contacts.DISPLAY_NAME)); // display in the list view contactView.setText(name); if (cur.getInt(cur.getColumnIndex( ContactsContract.Contacts.HAS_PHONE_NUMBER)) > 0) { Cursor pCur = cr.query( ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?", new String[]{id}, null); while (pCur.moveToNext()) { String phoneNo = pCur.getString(pCur.getColumnIndex( ContactsContract.CommonDataKinds.Phone.NUMBER)); } pCur.close(); } } } } } 6. Use ListViewinsteadof TextViewto displaycontacts