Implement share public key button

res/values/strings.xml

@@ -1529,5 +1529,8 @@
     <string name="activity_key_pair_copy_button_title">Copy</string>
     <string name="activity_key_pair_mnemonic_copied_message">Copied to Clipboard</string>
     <string name="activity_key_pair_register_button_title">Register</string>
+    <!-- Settings -->
+    <string name="activity_settings_share_public_key_button_title">Share Public Key</string>
+    <string name="activity_settings_public_key_copied_message">Copied to Clipboard</string>
 
 </resources>

res/xml/preferences.xml

@@ -33,4 +33,8 @@
                 android:title="@string/preferences__advanced"
                 android:icon="@drawable/ic_advanced_24dp"/>
 
+    <Preference android:key="preference_category_public_key"
+                android:title="@string/activity_settings_share_public_key_button_title"
+                android:icon="@drawable/ic_textsms_24dp"/>
+
 </PreferenceScreen>

src/org/thoughtcrime/securesms/ApplicationPreferencesActivity.java

@@ -18,6 +18,8 @@
 package org.thoughtcrime.securesms;
 
 import android.annotation.TargetApi;
+import android.content.ClipData;
+import android.content.ClipboardManager;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
@@ -33,6 +35,7 @@ import android.support.v4.app.FragmentTransaction;
 import android.support.v4.content.ContextCompat;
 import android.support.v4.graphics.drawable.DrawableCompat;
 import android.support.v7.preference.Preference;
+import android.widget.Toast;
 
 import org.thoughtcrime.securesms.preferences.AdvancedPreferenceFragment;
 import org.thoughtcrime.securesms.preferences.AppProtectionPreferenceFragment;
@@ -68,6 +71,7 @@ public class ApplicationPreferencesActivity extends PassphraseRequiredActionBarA
   private static final String PREFERENCE_CATEGORY_CHATS          = "preference_category_chats";
   private static final String PREFERENCE_CATEGORY_DEVICES        = "preference_category_devices";
   private static final String PREFERENCE_CATEGORY_ADVANCED       = "preference_category_advanced";
+  private static final String PREFERENCE_CATEGORY_PUBLIC_KEY     = "preference_category_public_key";
 
   private final DynamicTheme    dynamicTheme    = new DynamicTheme();
   private final DynamicLanguage dynamicLanguage = new DynamicLanguage();
@@ -154,6 +158,8 @@ public class ApplicationPreferencesActivity extends PassphraseRequiredActionBarA
         .setOnPreferenceClickListener(new CategoryClickListener(PREFERENCE_CATEGORY_DEVICES));
       this.findPreference(PREFERENCE_CATEGORY_ADVANCED)
         .setOnPreferenceClickListener(new CategoryClickListener(PREFERENCE_CATEGORY_ADVANCED));
+      this.findPreference(PREFERENCE_CATEGORY_PUBLIC_KEY)
+        .setOnPreferenceClickListener(new CategoryClickListener(PREFERENCE_CATEGORY_PUBLIC_KEY));
 
       if (VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
         tintIcons(getActivity());
@@ -205,6 +211,7 @@ public class ApplicationPreferencesActivity extends PassphraseRequiredActionBarA
       Drawable chats         = DrawableCompat.wrap(ContextCompat.getDrawable(context, R.drawable.ic_forum_white_24dp));
       Drawable devices       = DrawableCompat.wrap(ContextCompat.getDrawable(context, R.drawable.ic_laptop_white_24dp));
       Drawable advanced      = DrawableCompat.wrap(ContextCompat.getDrawable(context, R.drawable.ic_advanced_white_24dp));
+      Drawable publicKey     = DrawableCompat.wrap(ContextCompat.getDrawable(context, R.drawable.ic_share_white_24dp));
 
       int[]      tintAttr   = new int[]{R.attr.pref_icon_tint};
       TypedArray typedArray = context.obtainStyledAttributes(tintAttr);
@@ -226,6 +233,7 @@ public class ApplicationPreferencesActivity extends PassphraseRequiredActionBarA
       this.findPreference(PREFERENCE_CATEGORY_CHATS).setIcon(chats);
       this.findPreference(PREFERENCE_CATEGORY_DEVICES).setIcon(devices);
       this.findPreference(PREFERENCE_CATEGORY_ADVANCED).setIcon(advanced);
+      this.findPreference(PREFERENCE_CATEGORY_PUBLIC_KEY).setIcon(publicKey);
     }
 
     private class CategoryClickListener implements Preference.OnPreferenceClickListener {
@@ -262,6 +270,12 @@ public class ApplicationPreferencesActivity extends PassphraseRequiredActionBarA
         case PREFERENCE_CATEGORY_ADVANCED:
           fragment = new AdvancedPreferenceFragment();
           break;
+        case PREFERENCE_CATEGORY_PUBLIC_KEY:
+          ClipboardManager clipboard = (ClipboardManager) getContext().getSystemService(Context.CLIPBOARD_SERVICE);
+          ClipData clip = ClipData.newPlainText("public key", "public key"); // TODO: Use actual public key
+          clipboard.setPrimaryClip(clip);
+          Toast.makeText(getContext(), R.string.activity_settings_public_key_copied_message, Toast.LENGTH_SHORT).show();
+          break;
         default:
           throw new AssertionError();
         }