Call Blocking UI/String change

+ Adjusted UI/String according to new specifications.
+ Added class VisualVoicemailEnabledChecker
+ Block number dialog display different message depending
  on whether VVM is activated.

Bug:25455707
Change-Id: I09425053c91a5517e309302d421beadcc2d81cd4

8 files changed, 232 insertions, 62 deletions

diff --git a/src/com/android/dialer/CallDetailActivity.java b/src/com/android/dialer/CallDetailActivity.java
index 0d943e055..f63fcf3b0 100644
--- a/src/com/android/dialer/CallDetailActivity.java
+++ b/src/com/android/dialer/CallDetailActivity.java
@@ -358,6 +358,7 @@ public class CallDetailActivity extends AppCompatActivity
         switch(view.getId()) {
             case R.id.call_detail_action_block:
                 BlockNumberDialogFragment.show(
+                        this,
                         mBlockedNumberId,
                         mNumber,
                         mDetails.countryIso,
diff --git a/src/com/android/dialer/calllog/CallLogListItemViewHolder.java b/src/com/android/dialer/calllog/CallLogListItemViewHolder.java
index 12df6c6d3..0087506fd 100644
--- a/src/com/android/dialer/calllog/CallLogListItemViewHolder.java
+++ b/src/com/android/dialer/calllog/CallLogListItemViewHolder.java
@@ -328,6 +328,7 @@ public final class CallLogListItemViewHolder extends RecyclerView.ViewHolder
         switch (item.getItemId()) {
             case R.id.context_menu_block_number:
                 BlockNumberDialogFragment.show(
+                        mContext,
                         blockId,
                         number,
                         countryIso,
diff --git a/src/com/android/dialer/filterednumber/BlockNumberDialogFragment.java b/src/com/android/dialer/filterednumber/BlockNumberDialogFragment.java
index 7a94eebb5..4cbd4ddb8 100644
--- a/src/com/android/dialer/filterednumber/BlockNumberDialogFragment.java
+++ b/src/com/android/dialer/filterednumber/BlockNumberDialogFragment.java
@@ -23,25 +23,26 @@ import android.app.FragmentManager;
 import android.content.ContentValues;
 import android.content.Context;
 import android.content.DialogInterface;
-import android.content.res.Resources;
 import android.net.Uri;
 import android.os.Bundle;
 import android.support.design.widget.Snackbar;
-import android.telephony.PhoneNumberUtils;
 import android.text.TextUtils;
 import android.view.View;
 import android.widget.Toast;
 
+import com.android.contacts.common.util.ContactDisplayUtils;
 import com.android.dialer.R;
 import com.android.dialer.database.FilteredNumberAsyncQueryHandler;
 import com.android.dialer.database.FilteredNumberAsyncQueryHandler.OnBlockNumberListener;
 import com.android.dialer.database.FilteredNumberAsyncQueryHandler.OnUnblockNumberListener;
+import com.android.dialer.voicemail.VisualVoicemailEnabledChecker;
 
 /**
  * Fragment for confirming and enacting blocking/unblocking a number. Also invokes snackbar
  * providing undo functionality.
  */
-public class BlockNumberDialogFragment extends DialogFragment {
+public class BlockNumberDialogFragment extends DialogFragment
+        implements VisualVoicemailEnabledChecker.Callback{
 
     /**
      * Use a callback interface to update UI after success/undo. Favor this approach over other
@@ -69,9 +70,12 @@ public class BlockNumberDialogFragment extends DialogFragment {
 
     private FilteredNumberAsyncQueryHandler mHandler;
     private View mParentView;
+    private VisualVoicemailEnabledChecker mVoicemailEnabledChecker;
     private Callback mCallback;
+    private AlertDialog mAlertDialog;
 
     public static void show(
+            Context context,
             Integer blockId,
             String number,
             String countryIso,
@@ -80,13 +84,14 @@ public class BlockNumberDialogFragment extends DialogFragment {
             FragmentManager fragmentManager,
             Callback callback) {
         final BlockNumberDialogFragment newFragment = BlockNumberDialogFragment.newInstance(
-                blockId, number, countryIso, displayNumber, parentViewId);
+                context, blockId, number, countryIso, displayNumber, parentViewId);
 
         newFragment.setCallback(callback);
         newFragment.show(fragmentManager, BlockNumberDialogFragment.BLOCK_DIALOG_FRAGMENT);
     }
 
     private static BlockNumberDialogFragment newInstance(
+            Context context,
             Integer blockId,
             String number,
             String countryIso,
@@ -104,6 +109,8 @@ public class BlockNumberDialogFragment extends DialogFragment {
         args.putString(ARG_COUNTRY_ISO, countryIso);
         args.putString(ARG_DISPLAY_NUMBER, displayNumber);
         fragment.setArguments(args);
+        fragment.mVoicemailEnabledChecker = new VisualVoicemailEnabledChecker(context,fragment);
+        fragment.mVoicemailEnabledChecker.asyncUpdate();
         return fragment;
     }
 
@@ -123,17 +130,28 @@ public class BlockNumberDialogFragment extends DialogFragment {
         mHandler = new FilteredNumberAsyncQueryHandler(getContext().getContentResolver());
         mParentView = getActivity().findViewById(getArguments().getInt(ARG_PARENT_VIEW_ID));
 
-        String message;
+        CharSequence title;
         String okText;
+        String message;
         if (isBlocked) {
-            message = getString(R.string.unblockNumberConfirmation, mDisplayNumber);
-            okText = getString(R.string.unblockNumberOk);
+            title = getTtsSpannedPhoneNumberString(R.string.unblock_number_confirmation_title,
+                mDisplayNumber);
+            okText = getString(R.string.unblock_number_ok);
+            message = null;
         } else {
-            message = getString(R.string.blockNumberConfirmation, mDisplayNumber);
-            okText = getString(R.string.blockNumberOk);
+            title = getTtsSpannedPhoneNumberString(R.string.block_number_confirmation_title,
+                mDisplayNumber);
+            okText = getString(R.string.block_number_ok);
+            if (mVoicemailEnabledChecker.isVisualVoicemailEnabled()) {
+                message = getString(R.string.block_number_confirmation_message_vvm);
+            } else {
+                message = getString(R.string.block_number_confirmation_message_no_vvm);
+            }
         }
 
+
         AlertDialog.Builder builder = new AlertDialog.Builder(getActivity())
+                .setTitle(title)
                 .setMessage(message)
                 .setPositiveButton(okText, new DialogInterface.OnClickListener() {
                     public void onClick(DialogInterface dialog, int id) {
@@ -142,10 +160,16 @@ public class BlockNumberDialogFragment extends DialogFragment {
                         } else {
                             blockNumber();
                         }
+                        mAlertDialog = null;
                     }
                 })
-                .setNegativeButton(android.R.string.cancel, null);
-        return builder.create();
+                .setNegativeButton(android.R.string.cancel,  new DialogInterface.OnClickListener() {
+                    public void onClick(DialogInterface dialog, int id) {
+                        mAlertDialog = null;
+                    }
+                });
+        mAlertDialog = builder.create();
+        return mAlertDialog;
     }
 
     @Override
@@ -171,12 +195,17 @@ public class BlockNumberDialogFragment extends DialogFragment {
         mCallback = callback;
     }
 
-    private String getBlockedMessage() {
-        return getString(R.string.snackbar_number_blocked, mDisplayNumber);
+    private CharSequence getTtsSpannedPhoneNumberString(int id,String number){
+        String msg = getString(id, mDisplayNumber);
+        return ContactDisplayUtils.getTelephoneTtsSpannable(msg,mDisplayNumber);
+    }
+
+    private CharSequence getBlockedMessage() {
+        return getTtsSpannedPhoneNumberString(R.string.snackbar_number_blocked, mDisplayNumber);
     }
 
-    private String getUnblockedMessage() {
-        return getString(R.string.snackbar_number_unblocked, mDisplayNumber);
+    private CharSequence getUnblockedMessage() {
+        return getTtsSpannedPhoneNumberString(R.string.snackbar_number_unblocked, mDisplayNumber);
     }
 
     private int getActionTextColor() {
@@ -184,8 +213,8 @@ public class BlockNumberDialogFragment extends DialogFragment {
     }
 
     private void blockNumber() {
-        final String message = getBlockedMessage();
-        final String undoMessage = getUnblockedMessage();
+        final CharSequence message = getBlockedMessage();
+        final CharSequence undoMessage = getUnblockedMessage();
         final Callback callback = mCallback;
         final int actionTextColor = getActionTextColor();
         final Context context = getContext();
@@ -233,8 +262,8 @@ public class BlockNumberDialogFragment extends DialogFragment {
     }
 
     private void unblockNumber() {
-        final String message = getUnblockedMessage();
-        final String undoMessage = getBlockedMessage();
+        final CharSequence message = getUnblockedMessage();
+        final CharSequence undoMessage = getBlockedMessage();
         final Callback callback = mCallback;
         final int actionTextColor = getActionTextColor();
 
@@ -270,4 +299,19 @@ public class BlockNumberDialogFragment extends DialogFragment {
             }
         }, getArguments().getInt(ARG_BLOCK_ID));
     }
+
+    @Override
+    public void onVisualVoicemailEnabledStatusChanged(boolean newStatus){
+        updateActiveVoicemailProvider();
+    }
+
+    private void updateActiveVoicemailProvider(){
+        if(mAlertDialog != null) {
+            if (mVoicemailEnabledChecker.isVisualVoicemailEnabled()) {
+                mAlertDialog.setMessage(getString(R.string.block_number_confirmation_message_vvm));
+            } else {
+                mAlertDialog.setMessage(getString(R.string.block_number_confirmation_message_no_vvm));
+            }
+        }
+    }
 }
diff --git a/src/com/android/dialer/filterednumber/BlockedNumbersAdapter.java b/src/com/android/dialer/filterednumber/BlockedNumbersAdapter.java
index ad9e7a652..be83df723 100644
--- a/src/com/android/dialer/filterednumber/BlockedNumbersAdapter.java
+++ b/src/com/android/dialer/filterednumber/BlockedNumbersAdapter.java
@@ -16,8 +16,8 @@
 package com.android.dialer.filterednumber;
 
 import android.app.FragmentManager;
-import android.database.Cursor;
 import android.content.Context;
+import android.database.Cursor;
 import android.view.View;
 
 import com.android.contacts.common.ContactPhotoManager;
@@ -46,7 +46,7 @@ public class BlockedNumbersAdapter extends NumbersAdapter {
     }
 
     @Override
-    public void bindView(View view, Context context, Cursor cursor) {
+    public void bindView(View view, final Context context, Cursor cursor) {
         super.bindView(view, context, cursor);
         final Integer id = cursor.getInt(cursor.getColumnIndex(FilteredNumberColumns._ID));
         final String countryIso = cursor.getString(cursor.getColumnIndex(
@@ -60,6 +60,7 @@ public class BlockedNumbersAdapter extends NumbersAdapter {
             @Override
             public void onClick(View view) {
                 BlockNumberDialogFragment.show(
+                        context,
                         id,
                         number,
                         countryIso,
diff --git a/src/com/android/dialer/filterednumber/BlockedNumbersFragment.java b/src/com/android/dialer/filterednumber/BlockedNumbersFragment.java
index a2a716fe3..881ec0497 100644
--- a/src/com/android/dialer/filterednumber/BlockedNumbersFragment.java
+++ b/src/com/android/dialer/filterednumber/BlockedNumbersFragment.java
@@ -15,41 +15,40 @@
  */
 package com.android.dialer.filterednumber;
 
-import android.app.Activity;
 import android.app.ListFragment;
 import android.app.LoaderManager;
 import android.content.Context;
 import android.content.CursorLoader;
-import android.content.Intent;
 import android.content.Loader;
 import android.database.Cursor;
 import android.graphics.drawable.ColorDrawable;
 import android.os.Bundle;
-import android.widget.CompoundButton;
-import android.widget.Switch;
 import android.support.v7.app.ActionBar;
 import android.support.v7.app.AppCompatActivity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.CompoundButton;
-import android.widget.Switch;
+import android.widget.ImageView;
+import android.widget.TextView;
 
+import com.android.contacts.common.lettertiles.LetterTileDrawable;
 import com.android.dialer.R;
 import com.android.dialer.database.FilteredNumberContract;
 import com.android.dialer.filterednumber.FilteredNumbersUtil.CheckForSendToVoicemailContactListener;
 import com.android.dialer.filterednumber.FilteredNumbersUtil.ImportSendToVoicemailContactsListener;
-import com.android.dialer.voicemail.VoicemailStatusHelper;
-import com.android.dialer.voicemail.VoicemailStatusHelperImpl;
+import com.android.dialer.voicemail.VisualVoicemailEnabledChecker;
 
 public class BlockedNumbersFragment extends ListFragment
-        implements LoaderManager.LoaderCallbacks<Cursor>, View.OnClickListener {
+        implements LoaderManager.LoaderCallbacks<Cursor>, View.OnClickListener,
+        VisualVoicemailEnabledChecker.Callback {
+    private static final char ADD_BLOCKED_NUMBER_ICON_LETTER = '+';
 
     private BlockedNumbersAdapter mAdapter;
-    private VoicemailStatusHelper mVoicemailStatusHelper;
+    private VisualVoicemailEnabledChecker mVoicemailEnabledChecker;
 
     private View mImportSettings;
     private View mBlockedNumbersDisabledForEmergency;
+    private View mBlockedNumberListDivider;
 
     @Override
     public void onActivityCreated(Bundle savedInstanceState) {
@@ -58,6 +57,15 @@ public class BlockedNumbersFragment extends ListFragment
         LayoutInflater inflater =
                 (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
         getListView().addHeaderView(inflater.inflate(R.layout.blocked_number_header, null));
+        getListView().addFooterView(inflater.inflate(R.layout.blocked_number_footer, null));
+        //replace the icon for add number with LetterTileDrawable(), so it will have identical style
+        ImageView addNumberIcon = (ImageView) getActivity().findViewById(R.id.add_number_icon);
+        LetterTileDrawable drawable = new LetterTileDrawable(getResources());
+        drawable.setLetter(ADD_BLOCKED_NUMBER_ICON_LETTER);
+        drawable.setColor(getResources().getColor(R.color.add_blocked_number_icon_color,
+                getActivity().getTheme()));
+        drawable.setIsCircular(true);
+        addNumberIcon.setImageDrawable(drawable);
 
         if (mAdapter == null) {
             mAdapter = BlockedNumbersAdapter.newBlockedNumbersAdapter(
@@ -65,15 +73,17 @@ public class BlockedNumbersFragment extends ListFragment
         }
         setListAdapter(mAdapter);
 
-        mVoicemailStatusHelper = new VoicemailStatusHelperImpl();
-
-        mImportSettings = getActivity().findViewById(R.id.import_settings);
+        mImportSettings = getListView().findViewById(R.id.import_settings);
         mBlockedNumbersDisabledForEmergency =
-                getActivity().findViewById(R.id.blocked_numbers_disabled_for_emergency);
-
-        getActivity().findViewById(R.id.import_button).setOnClickListener(this);;
-        getActivity().findViewById(R.id.view_numbers_button).setOnClickListener(this);
-        getActivity().findViewById(R.id.add_number_textview).setOnClickListener(this);
+                getListView().findViewById(R.id.blocked_numbers_disabled_for_emergency);
+        mBlockedNumberListDivider = getActivity().findViewById(R.id.blocked_number_list_divider);
+        getListView().findViewById(R.id.import_button).setOnClickListener(this);;
+        getListView().findViewById(R.id.view_numbers_button).setOnClickListener(this);
+        getListView().findViewById(R.id.add_number_linear_layout).setOnClickListener(this);
+
+        mVoicemailEnabledChecker = new VisualVoicemailEnabledChecker(getContext(),this);
+        mVoicemailEnabledChecker.asyncUpdate();
+        updateActiveVoicemailProvider();
     }
 
     @Override
@@ -103,19 +113,21 @@ public class BlockedNumbersFragment extends ListFragment
         actionBar.setTitle(R.string.manage_blocked_numbers_label);
 
         FilteredNumbersUtil.checkForSendToVoicemailContact(
-                getActivity(), new CheckForSendToVoicemailContactListener() {
-                    @Override
-                    public void onComplete(boolean hasSendToVoicemailContact) {
-                        final int visibility = hasSendToVoicemailContact ? View.VISIBLE : View.GONE;
-                        mImportSettings.setVisibility(visibility);
-                    }
-                });
+            getActivity(), new CheckForSendToVoicemailContactListener() {
+                @Override
+                public void onComplete(boolean hasSendToVoicemailContact) {
+                    final int visibility = hasSendToVoicemailContact ? View.VISIBLE : View.GONE;
+                    mImportSettings.setVisibility(visibility);
+                }
+            });
 
         if (FilteredNumbersUtil.hasRecentEmergencyCall(getContext())) {
             mBlockedNumbersDisabledForEmergency.setVisibility(View.VISIBLE);
         } else {
             mBlockedNumbersDisabledForEmergency.setVisibility(View.GONE);
         }
+
+        mVoicemailEnabledChecker.asyncUpdate();
     }
 
     @Override
@@ -143,6 +155,11 @@ public class BlockedNumbersFragment extends ListFragment
     @Override
     public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
         mAdapter.swapCursor(data);
+        if (data.getCount() == 0) {
+            mBlockedNumberListDivider.setVisibility(View.INVISIBLE);
+        } else {
+            mBlockedNumberListDivider.setVisibility(View.VISIBLE);
+        }
     }
 
     @Override
@@ -158,7 +175,7 @@ public class BlockedNumbersFragment extends ListFragment
         }
 
         switch (view.getId()) {
-            case R.id.add_number_textview:
+            case R.id.add_number_linear_layout:
                 activity.showSearchUi();
                 break;
             case R.id.view_numbers_button:
@@ -175,4 +192,21 @@ public class BlockedNumbersFragment extends ListFragment
                 break;
         }
     }
+    @Override
+    public void onVisualVoicemailEnabledStatusChanged(boolean newStatus){
+        updateActiveVoicemailProvider();
+    }
+
+    private void updateActiveVoicemailProvider(){
+        if (getActivity() == null || getActivity().isFinishing()) {
+            return;
+        }
+        TextView footerText = (TextView) getActivity().findViewById(
+            R.id.blocked_number_footer_textview);
+        if (mVoicemailEnabledChecker.isVisualVoicemailEnabled()) {
+            footerText.setText(R.string.block_number_footer_message_vvm);
+        } else {
+            footerText.setText(R.string.block_number_footer_message_no_vvm);
+        }
+    }
 }
diff --git a/src/com/android/dialer/list/BlockedListSearchFragment.java b/src/com/android/dialer/list/BlockedListSearchFragment.java
index 94036ae81..7f8f12c73 100644
--- a/src/com/android/dialer/list/BlockedListSearchFragment.java
+++ b/src/com/android/dialer/list/BlockedListSearchFragment.java
@@ -36,7 +36,6 @@ import com.android.dialer.R;
 import com.android.dialer.database.FilteredNumberAsyncQueryHandler;
 import com.android.dialer.database.FilteredNumberAsyncQueryHandler.OnCheckBlockedListener;
 import com.android.dialer.filterednumber.BlockNumberDialogFragment;
-import com.android.dialer.filterednumber.BlockedNumbersSettingsActivity;
 import com.android.dialer.widget.SearchEditTextLayout;
 
 public class BlockedListSearchFragment extends RegularSearchFragment
@@ -177,6 +176,7 @@ public class BlockedListSearchFragment extends RegularSearchFragment
             public void onCheckComplete(Integer id) {
                 if (id == null) {
                     BlockNumberDialogFragment.show(
+                            getContext(),
                             id,
                             number,
                             countryIso,
@@ -224,6 +224,7 @@ public class BlockedListSearchFragment extends RegularSearchFragment
         }
 
         BlockNumberDialogFragment.show(
+                getContext(),
                 blockId,
                 number,
                 GeoUtil.getCurrentCountryIso(getContext()),
diff --git a/src/com/android/dialer/list/ListsFragment.java b/src/com/android/dialer/list/ListsFragment.java
index 08a23732f..4735926e8 100644
--- a/src/com/android/dialer/list/ListsFragment.java
+++ b/src/com/android/dialer/list/ListsFragment.java
@@ -15,10 +15,8 @@
  */
 package com.android.dialer.list;
 
-import android.animation.LayoutTransition;
 import android.app.Fragment;
 import android.app.FragmentManager;
-import android.content.Context;
 import android.content.SharedPreferences;
 import android.database.Cursor;
 import android.os.Bundle;
@@ -30,27 +28,21 @@ import android.support.v4.view.ViewPager;
 import android.support.v4.view.ViewPager.OnPageChangeListener;
 import android.support.v7.app.ActionBar;
 import android.support.v7.app.AppCompatActivity;
-import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.AbsListView;
-import android.widget.ListView;
 
-import com.android.contacts.common.GeoUtil;
 import com.android.contacts.common.list.ViewPagerTabs;
-import com.android.contacts.commonbind.analytics.AnalyticsUtil;
 import com.android.dialer.DialtactsActivity;
 import com.android.dialer.R;
 import com.android.dialer.calllog.CallLogFragment;
 import com.android.dialer.calllog.CallLogQueryHandler;
-import com.android.dialer.calllog.ContactInfoHelper;
 import com.android.dialer.logging.Logger;
 import com.android.dialer.util.DialerUtils;
+import com.android.dialer.voicemail.VisualVoicemailEnabledChecker;
 import com.android.dialer.voicemail.VoicemailStatusHelper;
 import com.android.dialer.voicemail.VoicemailStatusHelperImpl;
 import com.android.dialer.widget.ActionBarController;
-import com.android.dialerbind.ObjectFactory;
 
 import java.util.ArrayList;
 
@@ -76,9 +68,6 @@ public class ListsFragment extends Fragment
     public static final int TAB_COUNT_DEFAULT = 3;
     public static final int TAB_COUNT_WITH_VOICEMAIL = 4;
 
-    private static final String PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER =
-            "has_active_voicemail_provider";
-
     public interface HostInterface {
         public ActionBarController getActionBarController();
     }
@@ -182,7 +171,7 @@ public class ListsFragment extends Fragment
 
         mPrefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
         mHasActiveVoicemailProvider = mPrefs.getBoolean(
-                PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER, false);
+                VisualVoicemailEnabledChecker.PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER, false);
 
         Trace.endSection();
     }
@@ -317,7 +306,8 @@ public class ListsFragment extends Fragment
             mViewPagerTabs.updateTab(TAB_INDEX_VOICEMAIL);
 
             mPrefs.edit()
-                  .putBoolean(PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER, hasActiveVoicemailProvider)
+                  .putBoolean(VisualVoicemailEnabledChecker.PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER,
+                          hasActiveVoicemailProvider)
                   .commit();
         }
 
diff --git a/src/com/android/dialer/voicemail/VisualVoicemailEnabledChecker.java b/src/com/android/dialer/voicemail/VisualVoicemailEnabledChecker.java
new file mode 100644
index 000000000..3134b1486
--- /dev/null
+++ b/src/com/android/dialer/voicemail/VisualVoicemailEnabledChecker.java
@@ -0,0 +1,98 @@
+package com.android.dialer.voicemail;
+
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.database.Cursor;
+import android.preference.PreferenceManager;
+import android.support.annotation.Nullable;
+
+import com.android.dialer.calllog.CallLogQueryHandler;
+
+/**
+ * Helper class to check whether visual voicemail is enabled.
+ *
+ * Call isVisualVoicemailEnabled() to retrieve the result.
+ *
+ * The result is cached and saved in a SharedPreferences, stored as a boolean in
+ * PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER. Every time a new instance is created, it will try to
+ * restore the cached result from the SharedPreferences.
+ *
+ * Call asyncUpdate() to make a CallLogQuery to check the actual status. This is a async call so
+ * isVisualVoicemailEnabled() will not be affected immediately.
+ *
+ * If the status has changed as a result of asyncUpdate(),
+ * Callback.onVisualVoicemailEnabledStatusChanged() will be called with the new value.
+ */
+public class VisualVoicemailEnabledChecker implements CallLogQueryHandler.Listener {
+
+    public static final String PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER =
+            "has_active_voicemail_provider";
+    private SharedPreferences mPrefs;
+    private boolean mHasActiveVoicemailProvider;
+    private CallLogQueryHandler mCallLogQueryHandler;
+    private VoicemailStatusHelper mVoicemailStatusHelper;
+    private Context mContext;
+
+    public interface Callback {
+
+        /**
+         * Callback to notify enabled status has changed to the @param newValue
+         */
+        void onVisualVoicemailEnabledStatusChanged(boolean newValue);
+    }
+
+    private Callback mCallback;
+
+    public VisualVoicemailEnabledChecker(Context context, @Nullable Callback callback) {
+        mContext = context;
+        mCallback = callback;
+        mPrefs = PreferenceManager.getDefaultSharedPreferences(mContext);
+        mVoicemailStatusHelper = new VoicemailStatusHelperImpl();
+        mHasActiveVoicemailProvider = mPrefs.getBoolean(PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER,
+                false);
+    }
+
+    /**
+     * @return whether visual voicemail is enabled. Result is cached, call asyncUpdate() to
+     * update the result.
+     */
+    public boolean isVisualVoicemailEnabled() {
+        return mHasActiveVoicemailProvider;
+    }
+
+    /**
+     * Perform an async query into the system to check the status of visual voicemail.
+     * If the status has changed, Callback.onVisualVoicemailEnabledStatusChanged() will be called.
+     */
+    public void asyncUpdate() {
+        mCallLogQueryHandler =
+                new CallLogQueryHandler(mContext, mContext.getContentResolver(), this);
+        mCallLogQueryHandler.fetchVoicemailStatus();
+    }
+
+    @Override
+    public void onVoicemailStatusFetched(Cursor statusCursor) {
+        boolean hasActiveVoicemailProvider =
+                mVoicemailStatusHelper.getNumberActivityVoicemailSources(statusCursor) > 0;
+        if (hasActiveVoicemailProvider != mHasActiveVoicemailProvider) {
+            mHasActiveVoicemailProvider = hasActiveVoicemailProvider;
+            mPrefs.edit().putBoolean(PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER,
+                    mHasActiveVoicemailProvider);
+            if (mCallback != null) {
+                mCallback.onVisualVoicemailEnabledStatusChanged(mHasActiveVoicemailProvider);
+            }
+        }
+    }
+
+    @Override
+    public void onVoicemailUnreadCountFetched(Cursor cursor) {
+        // Do nothing
+    }
+
+    @Override
+    public boolean onCallsFetched(Cursor combinedCursor) {
+        // Do nothing
+        return false;
+    }
+}