Add copy mnemonic button

res/layout/activity_key_pair.xml

@@ -43,10 +43,23 @@
             android:layout_marginTop="16dp"
             android:alpha="0.8"
             android:textStyle="italic"
-            android:textAlignment="center" />
+            android:textAlignment="center"
+            tools:text="quick brown fox jump lazy dog" />
+
+        <Button
+            android:id="@+id/copyButton"
+            android:layout_width="match_parent"
+            android:layout_height="50dp"
+            android:layout_marginTop="20dp"
+            android:layout_gravity="center_horizontal"
+            android:background="@color/white"
+            android:textColor="@color/signal_primary"
+            android:text="@string/activity_key_pair_copy_button_title"
+            android:elevation="0dp"
+            android:stateListAnimator="@null" />
 
         <com.dd.CircularProgressButton
-            android:id="@+id/nextButton"
+            android:id="@+id/registerButton"
             android:layout_width="match_parent"
             android:layout_height="50dp"
             android:layout_marginTop="20dp"
@@ -57,7 +70,7 @@
             app:cpb_colorProgress="@color/textsecure_primary"
             app:cpb_cornerRadius="4dp"
             app:cpb_selectorIdle="@drawable/progress_button_state"
-            app:cpb_textIdle="@string/activity_key_pair_button_title" />
+            app:cpb_textIdle="@string/activity_key_pair_register_button_title" />
 
     </LinearLayout>
 

res/values/strings.xml

@@ -1526,6 +1526,8 @@
     <!-- Key pair activity -->
     <string name="activity_key_pair_title">Create Your Loki Messenger Account</string>
     <string name="activity_key_pair_subtitle">Please save the seed below in a safe location. It can be used to restore your account if you lose access, or to migrate to a new device.</string>
-    <string name="activity_key_pair_button_title">Register</string>
+    <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>
 
 </resources>

src/org/thoughtcrime/securesms/loki/KeyPairActivity.kt

@@ -1,7 +1,11 @@
 package org.thoughtcrime.securesms.loki
 
+import android.content.ClipData
+import android.content.ClipboardManager
+import android.content.Context
 import android.content.Intent
 import android.os.Bundle
+import android.widget.Toast
 import kotlinx.android.synthetic.main.activity_key_pair.*
 import org.thoughtcrime.securesms.BaseActionBarActivity
 import org.thoughtcrime.securesms.ConversationListActivity
@@ -18,6 +22,7 @@ import org.whispersystems.signalservice.loki.utilities.hexEncodedPublicKey
 import java.io.File
 import java.io.FileOutputStream
 
+
 class KeyPairActivity : BaseActionBarActivity() {
     private lateinit var languageFileDirectory: File
     private var keyPair: IdentityKeyPair? = null
@@ -31,7 +36,8 @@ class KeyPairActivity : BaseActionBarActivity() {
         setContentView(R.layout.activity_key_pair)
         setUpLanguageFileDirectory()
         updateKeyPair()
-        nextButton.setOnClickListener { register() }
+        copyButton.setOnClickListener { copy() }
+        registerButton.setOnClickListener { register() }
     }
     // endregion
 
@@ -74,6 +80,13 @@ class KeyPairActivity : BaseActionBarActivity() {
     // endregion
 
     // region Interaction
+    private fun copy() {
+        val clipboard = getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
+        val clip = ClipData.newPlainText("mnemonic", mnemonic)
+        clipboard.primaryClip = clip
+        Toast.makeText(this, R.string.activity_key_pair_mnemonic_copied_message, Toast.LENGTH_SHORT).show()
+    }
+
     private fun register() {
         val publicKey = keyPair!!.publicKey
         val hexEncodedPublicKey = keyPair!!.hexEncodedPublicKey