Prompt user to rate app

Closes #2841

// FREEBIE

res/values/strings.xml

@@ -279,6 +279,13 @@
     <string name="PassphrasePromptActivity_ok_button_content_description">Submit passphrase</string>
     <string name="PassphrasePromptActivity_invalid_passphrase_exclamation">Invalid passphrase!</string>
 
+    <!-- RatingManager -->
+    <string name="RatingManager_rate_this_app">Rate this app</string>
+    <string name="RatingManager_if_you_enjoy_using_this_app_please_take_a_moment">If you enjoy using this app, please take a moment to help us by rating it.</string>
+    <string name="RatingManager_rate_now">Rate now!</string>
+    <string name="RatingManager_no_thanks">No thanks</string>
+    <string name="RatingManager_later">Later</string>
+
     <!-- ReceiveKeyActivity -->
     <string name="ReceiveKeyActivity_the_signature_on_this_key_exchange_is_different">The
         signature on this key exchange is different than what you\'ve previously received from this

src/org/thoughtcrime/securesms/ConversationListActivity.java

@@ -30,6 +30,7 @@ import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
 
+import org.thoughtcrime.securesms.components.RatingManager;
 import org.thoughtcrime.securesms.crypto.MasterSecret;
 import org.thoughtcrime.securesms.database.DatabaseFactory;
 import org.thoughtcrime.securesms.notifications.MessageNotifier;
@@ -69,6 +70,7 @@ public class ConversationListActivity extends PassphraseRequiredActionBarActivit
     initializeContactUpdatesReceiver();
 
     DirectoryRefreshListener.schedule(this);
+    RatingManager.showRatingDialogIfNecessary(this);
   }
 
   @Override

src/org/thoughtcrime/securesms/components/RatingManager.java

@@ -0,0 +1,85 @@
+package org.thoughtcrime.securesms.components;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.net.Uri;
+import android.util.Log;
+
+import com.afollestad.materialdialogs.MaterialDialog;
+
+import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.util.TextSecurePreferences;
+
+import java.util.concurrent.TimeUnit;
+
+public class RatingManager {
+
+  private static final int DAYS_SINCE_INSTALL_THRESHOLD  = 7;
+  private static final int DAYS_UNTIL_REPROMPT_THRESHOLD = 4;
+
+  private static final String TAG = RatingManager.class.getSimpleName();
+
+  public static void showRatingDialogIfNecessary(Context context) {
+    if (!TextSecurePreferences.isRatingEnabled(context)) return;
+
+    long daysSinceInstall = getDaysSinceInstalled(context);
+    long laterTimestamp   = TextSecurePreferences.getRatingLaterTimestamp(context);
+
+    if (daysSinceInstall >= DAYS_SINCE_INSTALL_THRESHOLD &&
+        System.currentTimeMillis() >= laterTimestamp)
+    {
+      showRatingDialog(context);
+    }
+  }
+
+  private static void showRatingDialog(final Context context) {
+    new MaterialDialog.Builder(context)
+        .title(context.getString(R.string.RatingManager_rate_this_app))
+        .content(context.getString(R.string.RatingManager_if_you_enjoy_using_this_app_please_take_a_moment))
+        .positiveText(context.getString(R.string.RatingManager_rate_now))
+        .negativeText(context.getString(R.string.RatingManager_no_thanks))
+        .neutralText(context.getString(R.string.RatingManager_later))
+        .callback(new MaterialDialog.ButtonCallback() {
+          @Override
+          public void onPositive(MaterialDialog dialog) {
+            TextSecurePreferences.setRatingEnabled(context, false);
+            startPlayStore(context);
+            super.onPositive(dialog);
+          }
+
+          @Override
+          public void onNegative(MaterialDialog dialog) {
+            TextSecurePreferences.setRatingEnabled(context, false);
+            super.onNegative(dialog);
+          }
+
+          @Override
+          public void onNeutral(MaterialDialog dialog) {
+            long waitUntil = System.currentTimeMillis() + TimeUnit.DAYS.toMillis(DAYS_UNTIL_REPROMPT_THRESHOLD);
+            TextSecurePreferences.setRatingLaterTimestamp(context, waitUntil);
+            super.onNeutral(dialog);
+          }
+        })
+        .show();
+  }
+
+  private static void startPlayStore(Context context) {
+    Uri uri = Uri.parse("market://details?id=" + context.getPackageName());
+    context.startActivity(new Intent(Intent.ACTION_VIEW, uri));
+  }
+
+  private static long getDaysSinceInstalled(Context context) {
+    try {
+      long installTimestamp = context.getPackageManager()
+                                     .getPackageInfo(context.getPackageName(), 0)
+                                     .firstInstallTime;
+
+      return TimeUnit.MILLISECONDS.toDays(System.currentTimeMillis() - installTimestamp);
+    } catch (PackageManager.NameNotFoundException e) {
+      Log.w(TAG, e);
+      return 0;
+    }
+  }
+
+}

src/org/thoughtcrime/securesms/util/TextSecurePreferences.java

@@ -66,9 +66,27 @@ public class TextSecurePreferences {
   private static final String GCM_REGISTRATION_ID_PREF         = "pref_gcm_registration_id";
   private static final String GCM_REGISTRATION_ID_VERSION_PREF = "pref_gcm_registration_id_version";
   private static final String WEBSOCKET_REGISTERED_PREF        = "pref_websocket_registered";
+  private static final String RATING_LATER_PREF                = "pref_rating_later";
+  private static final String RATING_ENABLED_PREF              = "pref_rating_enabled";
 
   public  static final String REPEAT_ALERTS_PREF               = "pref_repeat_alerts";
 
+  public static long getRatingLaterTimestamp(Context context) {
+    return getLongPreference(context, RATING_LATER_PREF, 0);
+  }
+
+  public static void setRatingLaterTimestamp(Context context, long timestamp) {
+    setLongPreference(context, RATING_LATER_PREF, timestamp);
+  }
+
+  public static boolean isRatingEnabled(Context context) {
+    return getBooleanPreference(context, RATING_ENABLED_PREF, true);
+  }
+
+  public static void setRatingEnabled(Context context, boolean enabled) {
+    setBooleanPreference(context, RATING_ENABLED_PREF, enabled);
+  }
+
   public static boolean isWebsocketRegistered(Context context) {
     return getBooleanPreference(context, WEBSOCKET_REGISTERED_PREF, false);
   }