Ignore unchecked IME show/hide when no root

Both showSoftInputUnchecked() and closeCurrenInput() rely on rootView to
obtain window token. If view root is null, window has already gone away
and IME control had been revoked. Trying to show or hide at this time
would be a no-op.

Bug: 149900693
Test: Manually using the steps mentioned in bug and verify that there is
      no NPE.
Change-Id: I294bb2ec5395d7502a855bafbac672af069e9b4a
Merged-In: I294bb2ec5395d7502a855bafbac672af069e9b4a
(cherry picked from commit ba9b716a7092f97997fa4c2389d393e605d1c8ab)

1 files changed, 25 insertions, 13 deletions

diff --git a/core/java/android/view/inputmethod/InputMethodManager.java b/core/java/android/view/inputmethod/InputMethodManager.java
index aca265b1f59a..482d5b25e9da 100644
--- a/core/java/android/view/inputmethod/InputMethodManager.java
+++ b/core/java/android/view/inputmethod/InputMethodManager.java
@@ -1634,14 +1634,20 @@ public final class InputMethodManager {
     @Deprecated
     @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 123768499)
     public void showSoftInputUnchecked(int flags, ResultReceiver resultReceiver) {
-        try {
-            Log.w(TAG, "showSoftInputUnchecked() is a hidden method, which will be removed "
-                    + "soon. If you are using android.support.v7.widget.SearchView, please update "
-                    + "to version 26.0 or newer version.");
-            mService.showSoftInput(
-                    mClient, mCurRootView.getView().getWindowToken(), flags, resultReceiver);
-        } catch (RemoteException e) {
-            throw e.rethrowFromSystemServer();
+        synchronized (mH) {
+            try {
+                Log.w(TAG, "showSoftInputUnchecked() is a hidden method, which will be"
+                        + " removed soon. If you are using android.support.v7.widget.SearchView,"
+                        + " please update to version 26.0 or newer version.");
+                if (mCurRootView == null || mCurRootView.getView() == null) {
+                    Log.w(TAG, "No current root view, ignoring showSoftInputUnchecked()");
+                    return;
+                }
+                mService.showSoftInput(
+                        mClient, mCurRootView.getView().getWindowToken(), flags, resultReceiver);
+            } catch (RemoteException e) {
+                throw e.rethrowFromSystemServer();
+            }
         }
     }
 
@@ -1986,11 +1992,17 @@ public final class InputMethodManager {
 
     @UnsupportedAppUsage
     void closeCurrentInput() {
-        try {
-            mService.hideSoftInput(
-                    mClient, mCurRootView.getView().getWindowToken(), HIDE_NOT_ALWAYS, null);
-        } catch (RemoteException e) {
-            throw e.rethrowFromSystemServer();
+        synchronized (mH) {
+            if (mCurRootView == null || mCurRootView.getView() == null) {
+                Log.w(TAG, "No current root view, ignoring closeCurrentInput()");
+                return;
+            }
+            try {
+                mService.hideSoftInput(
+                        mClient, mCurRootView.getView().getWindowToken(), HIDE_NOT_ALWAYS, null);
+            } catch (RemoteException e) {
+                throw e.rethrowFromSystemServer();
+            }
         }
     }