diff --git a/deploy.py b/deploy.py
index c1f130a..bfb6ea3 100755
--- a/deploy.py
+++ b/deploy.py
@@ -314,60 +314,33 @@
         self.adb(*command)
 
     @contextlib.contextmanager
-    def launch(self, package_or_activity: str):
+    def launch(self, activity: str):
         """Launch an app and eventually goes back to the home screen.
 
-        There are two ways to start an application:
-
-        1. Start the main activity (advertised in the launcher), only
-           the package name is needed (e.g. `com.android.settings`);
-        2. Start a specific activity, the qualified activity name is
-           needed (e.g. `com.android.settings/.Settings`).
-
         Example:
 
         >>> device = DeviceUnderTest(...)
-        >>> with device.launch("com.android.settings"):
+        >>> with device.launch("com.android.settings/.Settings"):
         ...     device.ui(text="Bluetooth").exists
         True
         >>> device.ui(text="Bluetooth").exists
         False
 
-        :param package_or_activity: The package name or the qualified
-            activity name.
+        :param activity: The qualified activity name.
         :raise DeviceCommandError: If the app manager command failed.
-        :raise InvalidIntentError: If the package or activity could not
-            be resolved.
+        :raise InvalidIntentError: If the activity could not be
+            resolved.
         """
-        if "/" in package_or_activity:
-            [package, activity] = package_or_activity.split("/", maxsplit=1)
-        else:
-            package, activity = package_or_activity, ""
-
-        if activity:
-            command = [
-                "shell",
-                "am",
-                "start",
-                "-a",
-                "android.intent.action.MAIN",
-                package_or_activity,
-            ]
-        else:
-            # Use the monkey to avoid specifying the exact activity name.
-            command = [
-                "shell",
-                "monkey",
-                "-p",
-                package,
-                "-c",
-                "android.intent.category.LAUNCHER",
-                "1",
-            ]
+        command = ["shell", "am", "start", "-a", "android.intent.action.MAIN", activity]
 
         try:
             process = self.adb(*command)
-            if process.stderr:
+            # Ignore warnings as they should not impede the app launch.  For instance,
+            # Android is verbose about apps not started *again*, because they are e.g.
+            # already active in the background or in the foreground, and that's fine.
+            if process.stderr and not process.stderr.startswith(
+                "Warning: Activity not started"
+            ):
                 raise InvalidIntentError(self.serial, " ".join(command), process.stderr)
             yield
         finally:
@@ -502,7 +475,7 @@
             _LOG.info("Install %s", app)
             device.install(self.prebuilts_path / app.apk)
 
-        with device.launch("com.lunarlabs.panda"):
+        with device.launch("com.lunarlabs.panda/.ggb.Activity.MainActivity"):
             _LOG.info("Initiate first run of viSer")
 
             # Input the credentials
@@ -544,7 +517,7 @@
         )
         device.push(self.settings_file, self.target_settings_file)
 
-        with device.launch("com.lunarlabs.panda"):
+        with device.launch("com.lunarlabs.panda/.ggb.Activity.MainActivity"):
             device.ui(description="Open navigation drawer").click()
             device.ui(
                 text="Settings", className="android.widget.CheckedTextView"