Add Email suggestions in Create Key activity

OpenPGP-Keychain/src/main/AndroidManifest.xml

@@ -50,6 +50,7 @@
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.NFC" />
+    <uses-permission android:name="android.permission.GET_ACCOUNTS"/>
 
     <!-- android:allowBackup="false": Don't allow backup over adb backup or other apps! -->
     <application

OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/helper/ContactHelper.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2014 Dominik Schürmann <dominik@dominikschuermann.de>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.sufficientlysecure.keychain.helper;
+
+import android.accounts.Account;
+import android.accounts.AccountManager;
+import android.content.Context;
+import android.util.Patterns;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+public class ContactHelper {
+
+    public static final List<String> getMailAccounts(Context context) {
+        final Account[] accounts = AccountManager.get(context).getAccounts();
+        final Set<String> emailSet = new HashSet<String>();
+        for (Account account : accounts) {
+            if (Patterns.EMAIL_ADDRESS.matcher(account.name).matches()) {
+                emailSet.add(account.name);
+            }
+        }
+        return new ArrayList<String>(emailSet);
+    }
+}

OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/UserIdEditor.java

@@ -19,6 +19,7 @@ package org.sufficientlysecure.keychain.ui.widget;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
+import android.widget.*;
 import org.sufficientlysecure.keychain.R;
 
 import android.content.Context;
@@ -26,11 +27,9 @@ import android.util.AttributeSet;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.ViewGroup;
-import android.widget.EditText;
-import android.widget.LinearLayout;
-import android.widget.RadioButton;
 
 import com.beardedhen.androidbootstrap.BootstrapButton;
+import org.sufficientlysecure.keychain.helper.ContactHelper;
 
 public class UserIdEditor extends LinearLayout implements Editor, OnClickListener {
     private EditorListener mEditorListener = null;
@@ -38,7 +37,7 @@ public class UserIdEditor extends LinearLayout implements Editor, OnClickListene
     private BootstrapButton mDeleteButton;
     private RadioButton mIsMainUserId;
     private EditText mName;
-    private EditText mEmail;
+    private AutoCompleteTextView mEmail;
     private EditText mComment;
 
     // see http://www.regular-expressions.info/email.html
@@ -102,9 +101,17 @@ public class UserIdEditor extends LinearLayout implements Editor, OnClickListene
         mIsMainUserId.setOnClickListener(this);
 
         mName = (EditText) findViewById(R.id.name);
-        mEmail = (EditText) findViewById(R.id.email);
+        mEmail = (AutoCompleteTextView) findViewById(R.id.email);
         mComment = (EditText) findViewById(R.id.comment);
 
+
+        mEmail.setThreshold(1); // Start working from first character
+        mEmail.setAdapter(
+                new ArrayAdapter<String>
+                        (this.getContext(), android.R.layout.simple_dropdown_item_1line,
+                                                                    ContactHelper.getMailAccounts(getContext())
+                        ));
+
         super.onFinishInflate();
     }
 

OpenPGP-Keychain/src/main/res/layout/edit_key_user_id_item.xml

@@ -49,7 +49,7 @@
                     android:paddingRight="5dip"
                     android:text="@string/label_email" />
 
-                <EditText
+                <AutoCompleteTextView
                     android:id="@+id/email"
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"