Attach base context to application

<https://github.com/Genymobile/scrcpy/issues/4392#issuecomment-1790954884>

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

@@ -18,7 +18,7 @@ public final class FakeContext extends MutableContextWrapper {
     }
 
     private FakeContext() {
-        super(null);
+        super(Workarounds.retrieveSystemContext());
     }
 
     @Override

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

@@ -7,6 +7,7 @@ import android.content.AttributionSource;
 import android.content.Context;
 import android.content.ContextWrapper;
 import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
 import android.media.AudioAttributes;
 import android.media.AudioManager;
 import android.media.AudioRecord;
@@ -30,6 +31,12 @@ public final class Workarounds {
 
     public static void apply(boolean audio, boolean camera) {
         Workarounds.prepareMainLooper();
+        try {
+            fillActivityThread();
+            FakeContext.get();
+        } catch (Exception e) {
+            throw new AssertionError(e);
+        }
 
         boolean mustFillAppInfo = false;
         boolean mustFillBaseContext = false;
@@ -123,6 +130,19 @@ public final class Workarounds {
             ApplicationInfo applicationInfo = new ApplicationInfo();
             applicationInfo.packageName = FakeContext.PACKAGE_NAME;
 
+            Application application = new Application() {
+                @Override
+                public String getOpPackageName() {
+                    return FakeContext.PACKAGE_NAME;
+                }
+            };
+            Method method = ContextWrapper.class.getDeclaredMethod("attachBaseContext", Context.class);
+            method.invoke(application, retrieveSystemContext());
+
+            Field initialApplicationField = activityThreadClass.getDeclaredField("mInitialApplication");
+            initialApplicationField.setAccessible(true);
+            initialApplicationField.set(activityThread, application);
+
             // appBindData.appInfo = applicationInfo;
             Field appInfoField = appBindDataClass.getDeclaredField("appInfo");
             appInfoField.setAccessible(true);
@@ -306,4 +326,16 @@ public final class Workarounds {
             throw new RuntimeException("Cannot create AudioRecord");
         }
     }
+
+    static Context retrieveSystemContext() {
+        try {
+            Method getSystemContextMethod = activityThreadClass.getDeclaredMethod("getSystemContext");
+            Context ctx = (Context) getSystemContextMethod.invoke(activityThread);
+            Ln.i("===== " + ctx);
+            return ctx;
+        } catch (Exception e) {
+            Ln.e("Cannot retrieve system context", e);
+            return null;
+        }
+    }
 }