Fix TalkBack announces disruptive announcement in PIN/PWD page.

Set the description state to A11y Node info for
"Must be at least 4 characters" when enter "Set a password",
"Must be fewer than 17 digits" in the "Set a PIN" or "Set a password"
and "PIN must be at least 4 digit, but a 6-digit PIN is recommended
for adding security"

Flag: EXEMPT bugfix

Bug: 384588020
Bug: 384604918
Bug: 384619356

Test: local build and verify Talkback announcement in PIN/PWD page.
Change-Id: Ib81abdc41dba1eeb854f2c7361362b5d55f8c7c7

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

@@ -560,6 +560,7 @@ public class ChooseLockPassword extends SettingsActivity {
             setupPasswordRequirementsView(headerLayout);
 
             mPasswordRestrictionView.setLayoutManager(new LinearLayoutManager(getActivity()));
+            mPasswordRestrictionView.setAccessibilityLiveRegion(ACCESSIBILITY_LIVE_REGION_POLITE);
             mPasswordEntry = view.findViewById(R.id.password_entry);
             mPasswordEntry.setOnEditorActionListener(this);
             mPasswordEntry.addTextChangedListener(this);

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

@@ -20,9 +20,9 @@ import android.content.Context;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.accessibility.AccessibilityNodeInfo;
 import android.widget.TextView;
 
-import androidx.annotation.NonNull;
 import androidx.recyclerview.widget.RecyclerView;
 
 import com.android.settings.R;
@@ -66,15 +66,20 @@ public class PasswordRequirementAdapter extends
         return mRequirements[position].hashCode();
     }
 
-    @Override
-    public void onViewAttachedToWindow(@NonNull PasswordRequirementViewHolder holder) {
-        holder.mDescriptionText.announceForAccessibility(holder.mDescriptionText.getText());
-    }
-
     @Override
     public void onBindViewHolder(PasswordRequirementViewHolder holder, int position) {
         final int fontSize = mContext.getResources().getDimensionPixelSize(
                 R.dimen.password_requirement_font_size);
+
+        final String requirement = mRequirements[position];
+        holder.mDescriptionText.setAccessibilityDelegate(new View.AccessibilityDelegate() {
+            @Override
+            public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) {
+                super.onInitializeAccessibilityNodeInfo(host, info);
+                holder.mDescriptionText.setStateDescription(requirement);
+            }
+        });
+
         holder.mDescriptionText.setText(mRequirements[position]);
         if (mIsTooShortError) {
             holder.mDescriptionText.setTextAppearance(R.style.ScreenLockPasswordHintTextFontStyle);