"No quick responses available" should display when all quick responses are deleted

b/14239989

We take advantage of ListView's feature that displays an entirely different
view in place when the backing Adapter is empty. The empty view is simply a
TextView displaying "No quick responses available".

Change-Id: I244ffd21fc4c1557c73979d4bb7c99306b11ebb2

res/layout/quick_responses.xml

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2014 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:layout_width="match_parent"
+              android:layout_height="match_parent"
+              android:minHeight="64dp">
+
+    <ListView
+        android:id="@+id/quick_responses"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+    />
+
+    <TextView
+        android:id="@+id/quick_responses_empty_view"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        style="@style/quick_response_text"
+        android:text="@string/no_quick_responses"
+        android:textColor="@color/button_text_disabled_color"
+        />
+</FrameLayout>

res/values/strings.xml

@@ -860,4 +860,7 @@
 
     <string name="print_job_name" translatable="false">Email - <xliff:g id="subject">%1$s</xliff:g></string>
 
+    <!-- This message indicates no quick responses exist to choose from -->
+    <string name="no_quick_responses">None available</string>
+
 </resources>

src/com/android/email/activity/InsertQuickResponseDialog.java

@@ -16,10 +16,6 @@
 
 package com.android.email.activity;
 
-import com.android.email.R;
-import com.android.mail.providers.Account;
-import com.android.mail.providers.UIProvider;
-
 import android.app.AlertDialog;
 import android.app.Dialog;
 import android.app.DialogFragment;
@@ -31,12 +27,17 @@ import android.content.DialogInterface;
 import android.content.Loader;
 import android.database.Cursor;
 import android.os.Bundle;
+import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.AdapterView;
 import android.widget.AdapterView.OnItemClickListener;
 import android.widget.ListView;
 import android.widget.SimpleCursorAdapter;
 
+import com.android.email.R;
+import com.android.mail.providers.Account;
+import com.android.mail.providers.UIProvider;
+
 /**
  * Dialog which lists QuickResponses for the specified account. On user selection, will call
  * Callback.onQuickResponseSelected() with the selected QuickResponse text.
@@ -96,14 +97,21 @@ public class InsertQuickResponseDialog extends DialogFragment {
         // Now that Callback implementation is verified, build the dialog
         final Context context = getActivity();
 
-        final SimpleCursorAdapter adapter = new SimpleCursorAdapter(getActivity(),
+        final SimpleCursorAdapter adapter = new SimpleCursorAdapter(context,
                 R.layout.quick_response_item, null,
                 new String[] {UIProvider.QuickResponseColumns.TEXT},
                 new int[] {R.id.quick_response_text}, 0);
 
-        final ListView listView = new ListView(context);
+        final AlertDialog.Builder builder = new AlertDialog.Builder(context);
-        listView.setAdapter(adapter);
 
+        // inflate the view to show in the dialog
+        final LayoutInflater li = LayoutInflater.from(builder.getContext());
+        final View quickResponsesView = li.inflate(R.layout.quick_responses, null);
+
+        // the view contains both a ListView and its associated empty view; wire them together
+        final ListView listView = (ListView) quickResponsesView.findViewById(R.id.quick_responses);
+        listView.setEmptyView(quickResponsesView.findViewById(R.id.quick_responses_empty_view));
+        listView.setAdapter(adapter);
         listView.setOnItemClickListener(new OnItemClickListener() {
             @Override
             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
@@ -120,7 +128,7 @@ public class InsertQuickResponseDialog extends DialogFragment {
         getLoaderManager().initLoader(0, null, new LoaderManager.LoaderCallbacks<Cursor>() {
             @Override
             public Loader<Cursor> onCreateLoader(int id, Bundle args) {
-                return new CursorLoader(getActivity(), account.quickResponseUri,
+                return new CursorLoader(context, account.quickResponseUri,
                         UIProvider.QUICK_RESPONSE_PROJECTION, null, null, null);
             }
 
@@ -135,17 +143,19 @@ public class InsertQuickResponseDialog extends DialogFragment {
             }
         });
 
-        final AlertDialog.Builder b = new AlertDialog.Builder(context);
+        final String dialogTitle = getResources()
-        b.setTitle(getResources()
+                .getString(R.string.message_compose_insert_quick_response_list_title);
-                .getString(R.string.message_compose_insert_quick_response_list_title))
+
-                .setView(listView)
+        return builder
+                .setTitle(dialogTitle)
+                .setView(quickResponsesView)
                 .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
                     @Override
                     public void onClick(DialogInterface dialog, int which) {
                         dialog.cancel();
                     }
-                });
+                })
-        return b.create();
+                .create();
     }
 
     private Callback getCallback() {