Clarify Registration Lock reminder

Fixes #7484

res/layout/registration_lock_reminder_view.xml

@@ -18,6 +18,7 @@
                 android:layout_height="wrap_content"
                 android:textColor="@color/white"
                 android:textSize="18sp"
+                android:gravity="center_horizontal"
                 android:text="@string/registration_lock_reminder_view__enter_your_registration_lock_pin"/>
 
     </LinearLayout>
@@ -47,6 +48,6 @@
               android:paddingRight="20dp"
               android:textSize="15sp"
               android:lineSpacingMultiplier="1.3"
-              tools:text="Registration Lock is enabled for your phone number. I forgot my PIN."/>
+              tools:text="Reminder: Registration Lock is enabled for your phone number. To help you memorize your Registration Lock PIN, Signal will periodically ask you to confirm it. I forgot my PIN."/>
 
 </LinearLayout>

res/values/strings.xml

@@ -1386,7 +1386,7 @@
     <string name="RegistrationActivity_registration_of_this_phone_number_will_be_possible_without_your_registration_lock_pin_after_seven_days_have_passed">Registration of this phone number will be possible without your Registration Lock PIN after 7 days have passed since this phone number was last active on Signal. You have %d days remaining.</string>
     <string name="RegistrationActivity_registration_lock_pin">Registration lock PIN</string>
     <string name="RegistrationActivity_this_phone_number_has_registration_lock_enabled_please_enter_the_registration_lock_pin">This phone number has Registration Lock enabled. Please enter the Registration Lock PIN.</string>
-    <string name="RegistrationLockDialog_registration_lock_is_enabled_for_your_phone_number">Registration Lock is enabled for your phone number.</string>
+    <string name="RegistrationLockDialog_registration_lock_is_enabled_for_your_phone_number">Registration Lock is enabled for your phone number. To help you memorize your Registration Lock PIN, Signal will periodically ask you to confirm it.</string>
     <string name="RegistrationLockDialog_i_forgot_my_pin">I forgot my PIN.</string>
     <string name="RegistrationLockDialog_forgotten_pin">Forgotten PIN?</string>
     <string name="RegistrationLockDialog_registration_lock_helps_protect_your_phone_number_from_unauthorized_registration_attempts">Registration Lock helps protect your phone number from unauthorized registration attempts. This feature can be disabled at any time in your Signal privacy settings</string>
@@ -1401,6 +1401,7 @@
     <string name="preferences_chats__backups">Backups</string>
     <string name="prompt_passphrase_activity__signal_is_locked">Signal is locked</string>
     <string name="prompt_passphrase_activity__tap_to_unlock">TAP TO UNLOCK</string>
+    <string name="RegistrationLockDialog_reminder">Reminder:</string>
     <!-- EOF -->
 
 </resources>

src/org/thoughtcrime/securesms/lock/RegistrationLockDialog.java

@@ -5,6 +5,7 @@ import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.content.Context;
 import android.content.DialogInterface;
+import android.graphics.Typeface;
 import android.os.AsyncTask;
 import android.support.annotation.NonNull;
 import android.support.v7.app.AlertDialog;
@@ -15,6 +16,7 @@ import android.text.Spanned;
 import android.text.TextWatcher;
 import android.text.method.LinkMovementMethod;
 import android.text.style.ClickableSpan;
+import android.text.style.StyleSpan;
 import android.util.DisplayMetrics;
 import android.util.Log;
 import android.view.Display;
@@ -55,8 +57,8 @@ public class RegistrationLockDialog {
     display.getMetrics(metrics);
 
     dialog.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
-    dialog.getWindow().setLayout((int)(metrics.widthPixels * .75), ViewGroup.LayoutParams.WRAP_CONTENT);
     dialog.show();
+    dialog.getWindow().setLayout((int)(metrics.widthPixels * .80), ViewGroup.LayoutParams.WRAP_CONTENT);
 
     EditText    pinEditText = dialog.findViewById(R.id.pin);
     TextView    reminder    = dialog.findViewById(R.id.reminder);
@@ -64,6 +66,7 @@ public class RegistrationLockDialog {
     assert pinEditText != null;
     assert reminder != null;
 
+    SpannableString reminderIntro = new SpannableString(context.getString(R.string.RegistrationLockDialog_reminder));
     SpannableString reminderText = new SpannableString(context.getString(R.string.RegistrationLockDialog_registration_lock_is_enabled_for_your_phone_number));
     SpannableString forgotText   = new SpannableString(context.getString(R.string.RegistrationLockDialog_i_forgot_my_pin));
 
@@ -79,9 +82,11 @@ public class RegistrationLockDialog {
       }
     };
 
+
+    reminderIntro.setSpan(new StyleSpan(Typeface.BOLD), 0, reminderIntro.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
     forgotText.setSpan(clickableSpan, 0, forgotText.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
 
-    reminder.setText(new SpannableStringBuilder(reminderText).append(" ").append(forgotText));
+    reminder.setText(new SpannableStringBuilder(reminderIntro).append(" ").append(reminderText).append(" ").append(forgotText));
     reminder.setMovementMethod(LinkMovementMethod.getInstance());
 
     pinEditText.addTextChangedListener(new TextWatcher() {