Request hiding IME before starting next activity transition

Since legacy hideSoftInputFromWindow() for IME hiding animation
will be scheduled on the focus app's UI thread, so if activity
transition has running the animation on UI thread, the
IME hiding animation will be delayed until the animation finish.

Make sure calling WindowInsetsController#hide(ime()) before starting
activity transition to prevent flicker issue.

Bug: 204732064
Test: adb shell am start -a android.settings.BIOMETRIC_ENROLL
Test: SUW set/confirm pin and move to setup fingerprint(back and forth)
Test: make -j RunSettingsRoboTests

Change-Id: I33278dd5c993c0bc299ebd065011e5d18c7242e0

src/com/android/settings/password/ChooseLockPassword.java

@@ -954,6 +954,9 @@ public class ChooseLockPassword extends SettingsActivity {
                 return;
             }
 
+            ConfirmDeviceCredentialUtils.hideImeImmediately(
+                    getActivity().getWindow().getDecorView());
+
             mPasswordEntryInputDisabler.setInputEnabled(false);
             setNextEnabled(false);
 

src/com/android/settings/password/ConfirmDeviceCredentialUtils.java

@@ -25,6 +25,11 @@ import android.content.Intent;
 import android.content.IntentSender;
 import android.os.RemoteException;
 import android.os.UserManager;
+import android.view.View;
+import android.view.WindowInsets;
+import android.view.WindowInsetsController;
+
+import androidx.annotation.NonNull;
 
 import com.android.internal.widget.LockPatternUtils;
 
@@ -67,4 +72,16 @@ public class ConfirmDeviceCredentialUtils {
             utils.userPresent(userId);
         }
     }
+
+    /**
+     * Request hiding soft-keyboard before animating away credential UI, in case IME
+     * insets animation get delayed by dismissing animation.
+     * @param view used to get root {@link WindowInsets} and {@link WindowInsetsController}.
+     */
+    public static void hideImeImmediately(@NonNull View view) {
+        if (view.isAttachedToWindow()
+                && view.getRootWindowInsets().isVisible(WindowInsets.Type.ime())) {
+            view.getWindowInsetsController().hide(WindowInsets.Type.ime());
+        }
+    }
 }

src/com/android/settings/password/ConfirmLockPassword.java

@@ -493,6 +493,9 @@ public class ConfirmLockPassword extends ConfirmDeviceCredentialBaseActivity {
         }
 
         private void startDisappearAnimation(final Intent intent) {
+            ConfirmDeviceCredentialUtils.hideImeImmediately(
+                    getActivity().getWindow().getDecorView());
+
             if (mDisappearing) {
                 return;
             }

src/com/android/settings/password/SetupChooseLockPassword.java

@@ -22,7 +22,6 @@ import android.content.Intent;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;
-import android.view.inputmethod.InputMethodManager;
 import android.widget.Button;
 
 import androidx.annotation.Nullable;
@@ -121,9 +120,8 @@ public class SetupChooseLockPassword extends ChooseLockPassword {
                         forFace,
                         forBiometrics);
 
-                InputMethodManager imm = (InputMethodManager) getActivity().getSystemService(
+                ConfirmDeviceCredentialUtils.hideImeImmediately(
-                        Context.INPUT_METHOD_SERVICE);
+                        getActivity().getWindow().getDecorView());
-                imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
 
                 dialog.show(getFragmentManager());
                 return;