diff --git a/install.cpp b/install.cpp
index 482e0d7..0783433 100644
--- a/install.cpp
+++ b/install.cpp
@@ -34,9 +34,17 @@
 #include "verifier.h"
 #include "ui.h"
 
+extern RecoveryUI* ui;
+
 #define ASSUMED_UPDATE_BINARY_NAME  "META-INF/com/google/android/update-binary"
 #define PUBLIC_KEYS_FILE "/res/keys"
 
+// Default allocation of progress bar segments to operations
+static const int VERIFICATION_PROGRESS_TIME = 60;
+static const float VERIFICATION_PROGRESS_FRACTION = 0.25;
+static const float DEFAULT_FILES_PROGRESS_FRACTION = 0.4;
+static const float DEFAULT_IMAGE_PROGRESS_FRACTION = 0.1;
+
 // If the package contains an update binary, extract it and run it.
 static int
 try_update_binary(const char *path, ZipArchive *zip, int* wipe_cache) {
@@ -134,18 +142,17 @@
             float fraction = strtof(fraction_s, NULL);
             int seconds = strtol(seconds_s, NULL, 10);
 
-            ui_show_progress(fraction * (1-VERIFICATION_PROGRESS_FRACTION),
-                             seconds);
+            ui->ShowProgress(fraction * (1-VERIFICATION_PROGRESS_FRACTION), seconds);
         } else if (strcmp(command, "set_progress") == 0) {
             char* fraction_s = strtok(NULL, " \n");
             float fraction = strtof(fraction_s, NULL);
-            ui_set_progress(fraction);
+            ui->SetProgress(fraction);
         } else if (strcmp(command, "ui_print") == 0) {
             char* str = strtok(NULL, "\n");
             if (str) {
-                ui_print("%s", str);
+                ui->Print("%s", str);
             } else {
-                ui_print("\n");
+                ui->Print("\n");
             }
         } else if (strcmp(command, "wipe_cache") == 0) {
             *wipe_cache = 1;
@@ -244,9 +251,9 @@
 static int
 really_install_package(const char *path, int* wipe_cache)
 {
-    ui_set_background(BACKGROUND_ICON_INSTALLING);
-    ui_print("Finding update package...\n");
-    ui_show_indeterminate_progress();
+    ui->SetBackground(RecoveryUI::INSTALLING);
+    ui->Print("Finding update package...\n");
+    ui->SetProgressType(RecoveryUI::INDETERMINATE);
     LOGI("Update location: %s\n", path);
 
     if (ensure_path_mounted(path) != 0) {
@@ -254,7 +261,7 @@
         return INSTALL_CORRUPT;
     }
 
-    ui_print("Opening update package...\n");
+    ui->Print("Opening update package...\n");
 
     int numKeys;
     RSAPublicKey* loadedKeys = load_keys(PUBLIC_KEYS_FILE, &numKeys);
@@ -265,10 +272,9 @@
     LOGI("%d key(s) loaded from %s\n", numKeys, PUBLIC_KEYS_FILE);
 
     // Give verification half the progress bar...
-    ui_print("Verifying update package...\n");
-    ui_show_progress(
-            VERIFICATION_PROGRESS_FRACTION,
-            VERIFICATION_PROGRESS_TIME);
+    ui->Print("Verifying update package...\n");
+    ui->SetProgressType(RecoveryUI::DETERMINATE);
+    ui->ShowProgress(VERIFICATION_PROGRESS_FRACTION, VERIFICATION_PROGRESS_TIME);
 
     int err;
     err = verify_file(path, loadedKeys, numKeys);
@@ -290,7 +296,7 @@
 
     /* Verify and install the contents of the package.
      */
-    ui_print("Installing update...\n");
+    ui->Print("Installing update...\n");
     return try_update_binary(path, &zip, wipe_cache);
 }