Initialize Application object to avoid NPE

When an ApplicationInfo is set (commit
9029324), some devices (Nvidia Shield
TV) attempt to access the Application object, causing a
NullPointerException.

As a workaround, initialize an Application object.

Fixes <#940>

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

@@ -1,11 +1,15 @@
 package com.genymobile.scrcpy;
 
 import android.annotation.SuppressLint;
+import android.app.Application;
+import android.app.Instrumentation;
+import android.content.Context;
 import android.content.pm.ApplicationInfo;
 import android.os.Looper;
 
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Field;
+import java.lang.reflect.Method;
 
 public final class Workarounds {
     private Workarounds() {
@@ -56,6 +60,17 @@ public static void fillAppInfo() {
             Field mBoundApplicationField = activityThreadClass.getDeclaredField("mBoundApplication");
             mBoundApplicationField.setAccessible(true);
             mBoundApplicationField.set(activityThread, appBindData);
+
+            // Context ctx = activityThread.getSystemContext();
+            Method getSystemContextMethod = activityThreadClass.getDeclaredMethod("getSystemContext");
+            Context ctx = (Context) getSystemContextMethod.invoke(activityThread);
+
+            Application app = Instrumentation.newApplication(Application.class, ctx);
+
+            // activityThread.mInitialApplication = app;
+            Field mInitialApplicationField = activityThreadClass.getDeclaredField("mInitialApplication");
+            mInitialApplicationField.setAccessible(true);
+            mInitialApplicationField.set(activityThread, app);
         } catch (Throwable throwable) {
             // this is a workaround, so failing is not an error
             Ln.w("Could not fill app info: " + throwable.getMessage());