Fix NoSuchMethodError of readMapXml on Android 17 Beta 3 (#626)

Starting with Android 17 Beta 3 (detected in framework.jar, though not yet published to AOSP), the internal API for XmlUtils has changed its method signature. Specifically, the return type of readMapXml was modified from HashMap to the more generic Map interface.

Old signature:
```
Lcom/android/internal/util/XmlUtils;->readMapXml(Ljava/io/InputStream;)Ljava/util/HashMap;
```

New signature:
```
Lcom/android/internal/util/XmlUtils;->readMapXml(Ljava/io/InputStream;)Ljava/util/Map;
```

We migrate the call to use reflection.

Author: JingMatrix

hiddenapi/stubs/src/main/java/com/android/internal/util/XmlUtils.java

@@ -6,8 +6,6 @@
 import android.os.Environment;
 import android.preference.PreferenceManager;
 
-import com.android.internal.util.XmlUtils;
-
 import org.lsposed.lspd.util.Utils.Log;
 import org.matrix.vector.impl.core.VectorServiceClient;
 import org.matrix.vector.impl.utils.VectorMetaDataReader;
@@ -18,6 +16,8 @@
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
 import java.nio.file.AccessDeniedException;
 import java.nio.file.ClosedWatchServiceException;
 import java.nio.file.Path;
@@ -43,6 +43,7 @@ public final class XSharedPreferences implements SharedPreferences {
     private static final String TAG = "XSharedPreferences";
     private static final HashMap<WatchKey, PrefsData> sWatcherKeyInstances = new HashMap<>();
     private static final Object sContent = new Object();
+    private static final Method sReadMapXmlMethod;
     private static Thread sWatcherDaemon = null;
     private static WatchService sWatcher;
 
@@ -55,6 +56,19 @@ public final class XSharedPreferences implements SharedPreferences {
     private long mFileSize;
     private WatchKey mWatchKey;
 
+    static {
+        Method method = null;
+        try {
+            // Find the class and method once during class initialization
+            Class<?> xmlUtils = Class.forName("com.android.internal.util.XmlUtils");
+            method = xmlUtils.getDeclaredMethod("readMapXml", InputStream.class);
+            method.setAccessible(true);
+        } catch (Exception e) {
+            Log.e(TAG, "Failed to find com.android.internal.util.XmlUtils.readMapXml", e);
+        }
+        sReadMapXmlMethod = method;
+    }
+
     private static void initWatcherDaemon() {
         sWatcherDaemon = new Thread() {
             @Override
@@ -304,6 +318,22 @@ public void run() {
         }.start();
     }
 
+    private Map<?, ?> performReadMapXml(InputStream str) throws XmlPullParserException, IOException {
+        try {
+            if (sReadMapXmlMethod == null) throw new IOException("Internal API not found");
+            return (Map<?, ?>) sReadMapXmlMethod.invoke(null, str);
+        } catch (InvocationTargetException e) {
+            // Unwrap and throw the real error
+            Throwable cause = e.getCause();
+            if (cause instanceof XmlPullParserException) throw (XmlPullParserException) cause;
+            if (cause instanceof IOException) throw (IOException) cause;
+            if (cause instanceof RuntimeException) throw (RuntimeException) cause;
+            throw new RuntimeException(cause);
+        } catch (IllegalAccessException e) {
+            throw new IOException("Access denied to internal API", e);
+        }
+    }
+
     @SuppressWarnings({"rawtypes", "unchecked"})
     private void loadFromDiskLocked() {
         if (mLoaded) {
@@ -315,7 +345,7 @@ private void loadFromDiskLocked() {
         try {
             result = SELinuxHelper.getAppDataFileService().getFileInputStream(mFilename, mFileSize, mLastModified);
             if (result.stream != null) {
-                map = XmlUtils.readMapXml(result.stream);
+                map = performReadMapXml(result.stream);
                 result.stream.close();
             } else {
                 // The file is unchanged, keep the current values