DMS: check cached mode for user apps only

Android Studio uses adb to launch a process for screen mirroring. This
kind of processes is not managed by AMS and run with uid shell or root.
In such a case, that process behaves like a gone Android app so it will
miss display events. This won't impact any normal Android apps.

Check if the uid belongs to an Android app for Android Studio.

Bug: 303684492
Test: Enable display mirroring in Android Studio and check logs
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:380b3932bda7ad87f3180b8f1949d7b2b710b9d6)
Merged-In: I3fb20327979eca8774f7ddf143b2b8f2386e6b56
Change-Id: I3fb20327979eca8774f7ddf143b2b8f2386e6b56

1 files changed, 10 insertions, 1 deletions

diff --git a/services/core/java/com/android/server/display/DisplayManagerService.java b/services/core/java/com/android/server/display/DisplayManagerService.java
index 6466b440b3a0..bc7e15635035 100644
--- a/services/core/java/com/android/server/display/DisplayManagerService.java
+++ b/services/core/java/com/android/server/display/DisplayManagerService.java
@@ -2868,7 +2868,16 @@ public final class DisplayManagerService extends SystemService {
 
     // Check if the target app is in cached mode
     private boolean isUidCached(int uid) {
-        if (mActivityManagerInternal == null) {
+        // Only query procState and importance for Android apps, which have UIDs starting
+        // from FIRST_APPLICATION_UID. .
+        //
+        // Other processes with UID < FIRST_APPLICATION_UID can also register to DMS for
+        // display events. E.g. Android Studio executes a screen sharing process to provide
+        // display mirroring functionality. That process inherits the UID of adb. Depending
+        // on adb mode, it can be shell (2000) or root (0). Those processes are not Android
+        // apps and not managed by AMS. Treat them as non-cached so never ignore or defer
+        // display events to them.
+        if (mActivityManagerInternal == null || uid < FIRST_APPLICATION_UID) {
             return false;
         }
         int procState = mActivityManagerInternal.getUidProcessState(uid);