public class MainActivity extends AppCompatActivity {
ListView listView ;
ArrayList<String> StoreContacts ;
ArrayAdapter<String> arrayAdapter ;
Cursor cursor ;
String name, phonenumber ;
public static final int RequestPermissionCode = 1 ;
Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView)findViewById(R.id.listview1);
button = (Button)findViewById(R.id.button1);
StoreContacts = new ArrayList<String>();
EnableRuntimePermission();
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
GetContactsIntoArrayList();
arrayAdapter = new ArrayAdapter<String>(
MainActivity.this,
R.layout.contact_items_listview,
R.id.textView, StoreContacts
);
listView.setAdapter(arrayAdapter);
}
});
}
public void GetContactsIntoArrayList(){
cursor =
getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null,null, null, null);
while (cursor.moveToNext()) {
name =
cursor.getString(cursor.getColumnIndex
(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAM
E));
phonenumber =
cursor.getString(cursor.getColumnIndex
(ContactsContract.CommonDataKinds.Phone.NUMBER));
StoreContacts.add(name + " " + ":" + " " + phonenumber);
}
cursor.close();
}
public void EnableRuntimePermission(){
if (ActivityCompat.shouldShowRequestPermissionRationale(
MainActivity.this,
Manifest.permission.READ_CONTACTS))
{
Toast.makeText(MainActivity.this,"CONTACTS permission allows us to Access
CONTACTS app", Toast.LENGTH_LONG).show();
} else {
ActivityCompat.requestPermissions(MainActivity.this,new String[]{
Manifest.permission.READ_CONTACTS}, RequestPermissionCode);
}
}
@Override
public void onRequestPermissionsResult(int RC, String per[], int[] PResult) {
switch (RC) {
case RequestPermissionCode:
if (PResult.length > 0 && PResult[0] ==
PackageManager.PERMISSION_GRANTED) {
Toast.makeText(MainActivity.this,"Permission Granted, Now your
application can access CONTACTS.", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(MainActivity.this,"Permission Canceled, Now your
application cannot access CONTACTS.", Toast.LENGTH_LONG).show();
}
break;
}
}
}