From 90293240cc622bb58cb1de741f86cbc0889c03e8 Mon Sep 17 00:00:00 2001
From: act262 <act262@gmail.com>
Date: Mon, 28 Oct 2019 11:18:53 +0800
Subject: [PATCH] Fix meizu 16th NPE

Fill AppInfo to avoid NullPointerException on some devices.

Fixes <https://github.com/Genymobile/scrcpy/issues/365>

Signed-off-by: Romain Vimont <rom@rom1v.com>
---
 .../com/genymobile/scrcpy/ScreenEncoder.java  |  1 +
 .../com/genymobile/scrcpy/Workarounds.java    | 43 +++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/server/src/main/java/com/genymobile/scrcpy/ScreenEncoder.java b/server/src/main/java/com/genymobile/scrcpy/ScreenEncoder.java
index 504e9540..c9a37f84 100644
--- a/server/src/main/java/com/genymobile/scrcpy/ScreenEncoder.java
+++ b/server/src/main/java/com/genymobile/scrcpy/ScreenEncoder.java
@@ -53,6 +53,7 @@ public class ScreenEncoder implements Device.RotationListener {
 
     public void streamScreen(Device device, FileDescriptor fd) throws IOException {
         Workarounds.prepareMainLooper();
+        Workarounds.fillAppInfo();
 
         MediaFormat format = createFormat(bitRate, maxFps, iFrameInterval);
         device.setRotationListener(this);
diff --git a/server/src/main/java/com/genymobile/scrcpy/Workarounds.java b/server/src/main/java/com/genymobile/scrcpy/Workarounds.java
index 4dbf152e..f45d82a4 100644
--- a/server/src/main/java/com/genymobile/scrcpy/Workarounds.java
+++ b/server/src/main/java/com/genymobile/scrcpy/Workarounds.java
@@ -1,7 +1,12 @@
 package com.genymobile.scrcpy;
 
+import android.annotation.SuppressLint;
+import android.content.pm.ApplicationInfo;
 import android.os.Looper;
 
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+
 public final class Workarounds {
     private Workarounds() {
         // not instantiable
@@ -18,4 +23,42 @@ public final class Workarounds {
         // <https://github.com/Genymobile/scrcpy/issues/921>
         Looper.prepareMainLooper();
     }
+
+    @SuppressLint("PrivateApi")
+    public static void fillAppInfo() {
+        try {
+            // ActivityThread activityThread = new ActivityThread();
+            Class<?> activityThreadClass = Class.forName("android.app.ActivityThread");
+            Constructor<?> activityThreadConstructor = activityThreadClass.getDeclaredConstructor();
+            activityThreadConstructor.setAccessible(true);
+            Object activityThread = activityThreadConstructor.newInstance();
+
+            // ActivityThread.sCurrentActivityThread = activityThread;
+            Field sCurrentActivityThreadField = activityThreadClass.getDeclaredField("sCurrentActivityThread");
+            sCurrentActivityThreadField.setAccessible(true);
+            sCurrentActivityThreadField.set(null, activityThread);
+
+            // ActivityThread.AppBindData appBindData = new ActivityThread.AppBindData();
+            Class<?> appBindDataClass = Class.forName("android.app.ActivityThread$AppBindData");
+            Constructor<?> appBindDataConstructor = appBindDataClass.getDeclaredConstructor();
+            appBindDataConstructor.setAccessible(true);
+            Object appBindData = appBindDataConstructor.newInstance();
+
+            ApplicationInfo applicationInfo = new ApplicationInfo();
+            applicationInfo.packageName = "com.genymobile.scrcpy";
+
+            // appBindData.appInfo = applicationInfo;
+            Field appInfo = appBindDataClass.getDeclaredField("appInfo");
+            appInfo.setAccessible(true);
+            appInfo.set(appBindData, applicationInfo);
+
+            // activityThread.mBoundApplication = appBindData;
+            Field mBoundApplicationField = activityThreadClass.getDeclaredField("mBoundApplication");
+            mBoundApplicationField.setAccessible(true);
+            mBoundApplicationField.set(activityThread, appBindData);
+        } catch (Throwable throwable) {
+            // this is a workaround, so failing is not an error
+            Ln.w("Could not fill app info: " + throwable.getMessage());
+        }
+    }
 }