systemctx

Suppress lint "DiscouragedPrivateApi" in Workarounds.java.

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

@@ -2,10 +2,14 @@ package com.genymobile.scrcpy;
 
 import android.annotation.TargetApi;
 import android.content.AttributionSource;
+import android.content.Context;
 import android.content.ContextWrapper;
 import android.os.Build;
 import android.os.Process;
 
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Method;
+
 public final class FakeContext extends ContextWrapper {
 
     public static final String PACKAGE_NAME = "com.android.shell";
@@ -13,12 +17,27 @@ public final class FakeContext extends ContextWrapper {
 
     private static final FakeContext INSTANCE = new FakeContext();
 
+    private static Context retrieveSystemContext() {
+        try {
+            Class<?> activityThreadClass = Class.forName("android.app.ActivityThread");
+            Constructor<?> activityThreadConstructor = activityThreadClass.getDeclaredConstructor();
+            activityThreadConstructor.setAccessible(true);
+            Object activityThread = activityThreadConstructor.newInstance();
+
+            Method getSystemContextMethod = activityThread.getClass().getDeclaredMethod("getSystemContext");
+            return (Context) getSystemContextMethod.invoke(activityThread);
+        } catch (Exception e) {
+            Ln.e("Cannot retrieve system context", e);
+            return null;
+        }
+    }
+
     public static FakeContext get() {
         return INSTANCE;
     }
 
     private FakeContext() {
-        super(null);
+        super(retrieveSystemContext());
     }
 
     @Override

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

@@ -106,7 +106,7 @@ public final class Workarounds {
     }
 
     @TargetApi(Build.VERSION_CODES.R)
-    @SuppressLint({"WrongConstant", "MissingPermission", "BlockedPrivateApi", "SoonBlockedPrivateApi"})
+    @SuppressLint("WrongConstant,MissingPermission,BlockedPrivateApi,SoonBlockedPrivateApi,DiscouragedPrivateApi")
     public static AudioRecord createAudioRecord(int source, int sampleRate, int channelConfig, int channels, int channelMask, int encoding) {
         // Vivo (and maybe some other third-party ROMs) modified `AudioRecord`'s constructor, requiring `Context`s from real App environment.
         //