Use ROOT_UID from FakeContext

Remove USER_ID from ServiceManager, and replace it by a constant in
FakeContext.

This is the same as android.os.Process.ROOT_UID, but this constant has
been introduced in API 29.

PR #3757 <https://github.com/Genymobile/scrcpy/pull/3757>

server/src/main/java/com/genymobile/scrcpy/FakeContext.java

@@ -9,6 +9,7 @@ import android.os.Process;
 public final class FakeContext extends ContextWrapper {
 
     public static final String PACKAGE_NAME = "com.android.shell";
+    public static final int ROOT_UID = 0; // Like android.os.Process.ROOT_UID, but before API 29
 
     private static final FakeContext INSTANCE = new FakeContext();
 

server/src/main/java/com/genymobile/scrcpy/wrappers/ActivityManager.java

@@ -1,5 +1,6 @@
 package com.genymobile.scrcpy.wrappers;
 
+import com.genymobile.scrcpy.FakeContext;
 import com.genymobile.scrcpy.Ln;
 
 import android.os.Binder;
@@ -48,10 +49,10 @@ public class ActivityManager {
             Object[] args;
             if (getContentProviderExternalMethodNewVersion) {
                 // new version
-                args = new Object[]{name, ServiceManager.USER_ID, token, null};
+                args = new Object[]{name, FakeContext.ROOT_UID, token, null};
             } else {
                 // old version
-                args = new Object[]{name, ServiceManager.USER_ID, token};
+                args = new Object[]{name, FakeContext.ROOT_UID, token};
             }
             // ContentProviderHolder providerHolder = getContentProviderExternal(...);
             Object providerHolder = method.invoke(manager, args);

server/src/main/java/com/genymobile/scrcpy/wrappers/ClipboardManager.java

@@ -62,9 +62,9 @@ public class ClipboardManager {
             return (ClipData) method.invoke(manager, FakeContext.PACKAGE_NAME);
         }
         if (alternativeMethod) {
-            return (ClipData) method.invoke(manager, FakeContext.PACKAGE_NAME, null, ServiceManager.USER_ID);
+            return (ClipData) method.invoke(manager, FakeContext.PACKAGE_NAME, null, FakeContext.ROOT_UID);
         }
-        return (ClipData) method.invoke(manager, FakeContext.PACKAGE_NAME, ServiceManager.USER_ID);
+        return (ClipData) method.invoke(manager, FakeContext.PACKAGE_NAME, FakeContext.ROOT_UID);
     }
 
     private static void setPrimaryClip(Method method, boolean alternativeMethod, IInterface manager, ClipData clipData)
@@ -72,9 +72,9 @@ public class ClipboardManager {
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
             method.invoke(manager, clipData, FakeContext.PACKAGE_NAME);
         } else if (alternativeMethod) {
-            method.invoke(manager, clipData, FakeContext.PACKAGE_NAME, null, ServiceManager.USER_ID);
+            method.invoke(manager, clipData, FakeContext.PACKAGE_NAME, null, FakeContext.ROOT_UID);
         } else {
-            method.invoke(manager, clipData, FakeContext.PACKAGE_NAME, ServiceManager.USER_ID);
+            method.invoke(manager, clipData, FakeContext.PACKAGE_NAME, FakeContext.ROOT_UID);
         }
     }
 
@@ -109,9 +109,9 @@ public class ClipboardManager {
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
             method.invoke(manager, listener, FakeContext.PACKAGE_NAME);
         } else if (alternativeMethod) {
-            method.invoke(manager, listener, FakeContext.PACKAGE_NAME, null, ServiceManager.USER_ID);
+            method.invoke(manager, listener, FakeContext.PACKAGE_NAME, null, FakeContext.ROOT_UID);
         } else {
-            method.invoke(manager, listener, FakeContext.PACKAGE_NAME, ServiceManager.USER_ID);
+            method.invoke(manager, listener, FakeContext.PACKAGE_NAME, FakeContext.ROOT_UID);
         }
     }
 

server/src/main/java/com/genymobile/scrcpy/wrappers/ContentProvider.java

@@ -138,7 +138,7 @@ public class ContentProvider implements Closeable {
     public String getValue(String table, String key) throws SettingsException {
         String method = getGetMethod(table);
         Bundle arg = new Bundle();
-        arg.putInt(CALL_METHOD_USER_KEY, ServiceManager.USER_ID);
+        arg.putInt(CALL_METHOD_USER_KEY, FakeContext.ROOT_UID);
         try {
             Bundle bundle = call(method, key, arg);
             if (bundle == null) {
@@ -154,7 +154,7 @@ public class ContentProvider implements Closeable {
     public void putValue(String table, String key, String value) throws SettingsException {
         String method = getPutMethod(table);
         Bundle arg = new Bundle();
-        arg.putInt(CALL_METHOD_USER_KEY, ServiceManager.USER_ID);
+        arg.putInt(CALL_METHOD_USER_KEY, FakeContext.ROOT_UID);
         arg.putString(NAME_VALUE_TABLE_VALUE, value);
         try {
             call(method, key, arg);

server/src/main/java/com/genymobile/scrcpy/wrappers/ServiceManager.java

@@ -10,8 +10,6 @@ import java.lang.reflect.Method;
 @SuppressLint("PrivateApi,DiscouragedPrivateApi")
 public final class ServiceManager {
 
-    public static final int USER_ID = 0;
-
     private static final Method GET_SERVICE_METHOD;
     static {
         try {