ask for contact permissions when first opening StartConversationActivity

src/main/java/eu/siacs/conversations/persistance/FileBackend.java

@@ -410,6 +410,8 @@ public class FileBackend {
 				}
 				return cropCenterSquare(input, size);
 			}
+		} catch (SecurityException e) {
+			return null; // happens for example on Android 6.0 if contacts permissions get revoked
 		} catch (FileNotFoundException e) {
 			return null;
 		} finally {
@@ -451,6 +453,8 @@ public class FileBackend {
 				source.recycle();
 			}
 			return dest;
+		} catch (SecurityException e) {
+			return null; //android 6.0 with revoked permissions for example
 		} catch (FileNotFoundException e) {
 			return null;
 		} finally {
@@ -479,7 +483,7 @@ public class FileBackend {
 		return output;
 	}
 
-	private int calcSampleSize(Uri image, int size) throws FileNotFoundException {
+	private int calcSampleSize(Uri image, int size) throws FileNotFoundException, SecurityException {
 		BitmapFactory.Options options = new BitmapFactory.Options();
 		options.inJustDecodeBounds = true;
 		BitmapFactory.decodeStream(mXmppConnectionService.getContentResolver().openInputStream(image), null, options);

src/main/java/eu/siacs/conversations/services/XmppConnectionService.java

@@ -468,9 +468,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 					break;
 				case ACTION_MERGE_PHONE_CONTACTS:
 					if (mRestoredFromDatabase) {
-						PhoneHelper.loadPhoneContacts(getApplicationContext(),
+						loadPhoneContacts();
-								new CopyOnWriteArrayList<Bundle>(),
-								this);
 					}
 					return START_STICKY;
 				case Intent.ACTION_SHUTDOWN:
@@ -1097,9 +1095,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 					}
 					getBitmapCache().evictAll();
 					Looper.prepare();
-					PhoneHelper.loadPhoneContacts(getApplicationContext(),
+					loadPhoneContacts();
-							new CopyOnWriteArrayList<Bundle>(),
-							XmppConnectionService.this);
 					Log.d(Config.LOGTAG, "restoring messages");
 					for (Conversation conversation : conversations) {
 						conversation.addAll(0, databaseBackend.getMessages(conversation, Config.PAGE_SIZE));
@@ -1121,6 +1117,12 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		}
 	}
 
+	public void loadPhoneContacts() {
+		PhoneHelper.loadPhoneContacts(getApplicationContext(),
+				new CopyOnWriteArrayList<Bundle>(),
+				XmppConnectionService.this);
+	}
+
 	public List<Conversation> getConversations() {
 		return this.conversations;
 	}

src/main/java/eu/siacs/conversations/ui/StartConversationActivity.java

@@ -1,5 +1,6 @@
 package eu.siacs.conversations.ui;
 
+import android.Manifest;
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.app.ActionBar;
@@ -13,6 +14,7 @@ import android.content.Context;
 import android.content.DialogInterface;
 import android.content.DialogInterface.OnClickListener;
 import android.content.Intent;
+import android.content.pm.PackageManager;
 import android.net.Uri;
 import android.nfc.NdefMessage;
 import android.nfc.NdefRecord;
@@ -51,6 +53,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
+import java.util.concurrent.atomic.AtomicBoolean;
 
 import eu.siacs.conversations.Config;
 import eu.siacs.conversations.R;
@@ -89,6 +92,9 @@ public class StartConversationActivity extends XmppActivity implements OnRosterU
 	private Invite mPendingInvite = null;
 	private Menu mOptionsMenu;
 	private EditText mSearchEditText;
+	private AtomicBoolean mRequestedContactsPermission = new AtomicBoolean(false);
+	private final int REQUEST_SYNC_CONTACTS = 0x3b28cf;
+
 	private MenuItem.OnActionExpandListener mOnActionExpandListener = new MenuItem.OnActionExpandListener() {
 
 		@Override
@@ -245,6 +251,12 @@ public class StartConversationActivity extends XmppActivity implements OnRosterU
 
 	}
 
+	@Override
+	public void onStart() {
+		super.onStart();
+		askForContactsPermissions();
+	}
+
 	protected void openConversationForContact(int position) {
 		Contact contact = (Contact) contacts.get(position);
 		Conversation conversation = xmppConnectionService
@@ -580,6 +592,41 @@ public class StartConversationActivity extends XmppActivity implements OnRosterU
 		super.onActivityResult(requestCode, requestCode, intent);
 	}
 
+	private void askForContactsPermissions() {
+		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+			if (checkSelfPermission(Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
+				if (mRequestedContactsPermission.compareAndSet(false, true)) {
+					if (shouldShowRequestPermissionRationale(Manifest.permission.READ_CONTACTS)) {
+						AlertDialog.Builder builder = new AlertDialog.Builder(this);
+						builder.setTitle(R.string.sync_with_contacts);
+						builder.setMessage(R.string.sync_with_contacts_long);
+						builder.setPositiveButton(R.string.sync_now, new OnClickListener() {
+							@Override
+							public void onClick(DialogInterface dialog, int which) {
+								if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+									requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, REQUEST_SYNC_CONTACTS);
+								}
+							}
+						});
+						builder.create().show();
+					} else {
+						requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, 0);
+					}
+				}
+			}
+		}
+	}
+
+	@Override
+	public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
+		if (grantResults.length > 0)
+			if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+				if (requestCode == REQUEST_SYNC_CONTACTS && xmppConnectionServiceBound) {
+					xmppConnectionService.loadPhoneContacts();
+				}
+			}
+	}
+
 	@Override
 	protected void onBackendConnected() {
 		this.mActivatedAccounts.clear();

src/main/java/eu/siacs/conversations/utils/PhoneHelper.java

@@ -1,5 +1,6 @@
 package eu.siacs.conversations.utils;
 
+import android.Manifest;
 import android.content.Context;
 import android.content.CursorLoader;
 import android.content.Loader;
@@ -7,6 +8,7 @@ import android.content.Loader.OnLoadCompleteListener;
 import android.content.pm.PackageManager;
 import android.database.Cursor;
 import android.net.Uri;
+import android.os.Build;
 import android.os.Bundle;
 import android.provider.ContactsContract;
 import android.provider.ContactsContract.Profile;
@@ -17,6 +19,11 @@ import java.util.concurrent.RejectedExecutionException;
 public class PhoneHelper {
 
 	public static void loadPhoneContacts(Context context,final List<Bundle> phoneContacts, final OnPhoneContactsLoadedListener listener) {
+		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
+				&& context.checkSelfPermission(Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
+			listener.onPhoneContactsLoaded(phoneContacts);
+			return;
+		}
 		final String[] PROJECTION = new String[] { ContactsContract.Data._ID,
 				ContactsContract.Data.DISPLAY_NAME,
 				ContactsContract.Data.PHOTO_URI,
@@ -74,6 +81,10 @@ public class PhoneHelper {
 	}
 
 	public static Uri getSefliUri(Context context) {
+		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
+				&& context.checkSelfPermission(Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
+			return null;
+		}
 		String[] mProjection = new String[] { Profile._ID, Profile.PHOTO_URI };
 		Cursor mProfileCursor = context.getContentResolver().query(
 				Profile.CONTENT_URI, mProjection, null, null, null);

src/main/res/values/strings.xml

@@ -558,4 +558,7 @@
 	<string name="shared_file_with_x">Shared file with %s</string>
 	<string name="shared_image_with_x">Shared image with %s</string>
 	<string name="no_storage_permission">Conversations need access to external storage</string>
+	<string name="sync_with_contacts">Synchronize with contacts</string>
+	<string name="sync_with_contacts_long">Conversations wants to match your XMPP roster with your contacts to show their full names and avatars.\n\nConversations will only read your contacts and match them locally without uploading them to your server.</string>
+	<string name="sync_now">Synchronize now</string>
 </resources>