[DO NOT MERGE] Close screenshot process on user switched

Currently, we keep the process up even if the user switches,
meaning that in some cases (if the user is switched while the
screenshot UI is up) we will save images to the wrong profile.
This change makes ScreenshotHelper listen for user switches and
close the screenshot service, so that a new screenshot is
guaranteed to be constructed with the correct user's context.

Bug: 170474245
Fix: 170474245
Test: manual -- verified bad state occurs if user switches within
the timeout period, ensured that screenshots work immediately
after switching with this change.

Change-Id: I9d32d0928e6c2bda161d04555438d0dd7afef0ba
(cherry picked from commit 7ef1a5dd1506075507412626f2533283d9520144)

1 files changed, 31 insertions, 9 deletions

diff --git a/core/java/com/android/internal/util/ScreenshotHelper.java b/core/java/com/android/internal/util/ScreenshotHelper.java
index 9bf05135c4c5..9ee7c3005b0e 100644
--- a/core/java/com/android/internal/util/ScreenshotHelper.java
+++ b/core/java/com/android/internal/util/ScreenshotHelper.java
@@ -1,12 +1,15 @@
 package com.android.internal.util;
 
+import static android.content.Intent.ACTION_USER_SWITCHED;
 import static android.view.WindowManager.ScreenshotSource.SCREENSHOT_OTHER;
 
 import android.annotation.NonNull;
 import android.annotation.Nullable;
+import android.content.BroadcastReceiver;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
+import android.content.IntentFilter;
 import android.content.ServiceConnection;
 import android.graphics.Insets;
 import android.graphics.Rect;
@@ -161,8 +164,21 @@ public class ScreenshotHelper {
     private ServiceConnection mScreenshotConnection = null;
     private final Context mContext;
 
+    private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            synchronized (mScreenshotLock) {
+                if (ACTION_USER_SWITCHED.equals(intent.getAction())) {
+                    resetConnection();
+                }
+            }
+        }
+    };
+
     public ScreenshotHelper(Context context) {
         mContext = context;
+        IntentFilter filter = new IntentFilter(ACTION_USER_SWITCHED);
+        mContext.registerReceiver(mBroadcastReceiver, filter);
     }
 
     /**
@@ -279,9 +295,8 @@ public class ScreenshotHelper {
             final Runnable mScreenshotTimeout = () -> {
                 synchronized (mScreenshotLock) {
                     if (mScreenshotConnection != null) {
-                        mContext.unbindService(mScreenshotConnection);
-                        mScreenshotConnection = null;
-                        mScreenshotService = null;
+                        Log.e(TAG, "Timed out before getting screenshot capture response");
+                        resetConnection();
                         notifyScreenshotError();
                     }
                 }
@@ -305,9 +320,7 @@ public class ScreenshotHelper {
                         case SCREENSHOT_MSG_PROCESS_COMPLETE:
                             synchronized (mScreenshotLock) {
                                 if (myConn != null && mScreenshotConnection == myConn) {
-                                    mContext.unbindService(myConn);
-                                    mScreenshotConnection = null;
-                                    mScreenshotService = null;
+                                    resetConnection();
                                 }
                             }
                             break;
@@ -348,9 +361,7 @@ public class ScreenshotHelper {
                     public void onServiceDisconnected(ComponentName name) {
                         synchronized (mScreenshotLock) {
                             if (mScreenshotConnection != null) {
-                                mContext.unbindService(mScreenshotConnection);
-                                mScreenshotConnection = null;
-                                mScreenshotService = null;
+                                resetConnection();
                                 // only log an error if we're still within the timeout period
                                 if (handler.hasCallbacks(mScreenshotTimeout)) {
                                     handler.removeCallbacks(mScreenshotTimeout);
@@ -382,6 +393,17 @@ public class ScreenshotHelper {
     }
 
     /**
+     * Unbinds the current screenshot connection (if any).
+     */
+    private void resetConnection() {
+        if (mScreenshotConnection != null) {
+            mContext.unbindService(mScreenshotConnection);
+            mScreenshotConnection = null;
+            mScreenshotService = null;
+        }
+    }
+
+    /**
      * Notifies the screenshot service to show an error.
      */
     private void notifyScreenshotError() {