HabitPickerDialog: Show "no habits found" message

android/uhabits-android/src/main/java/org/isoron/uhabits/widgets/activities/HabitPickerDialog.kt

@@ -32,10 +32,12 @@ import java.util.*
 
 class BooleanHabitPickerDialog : HabitPickerDialog() {
     override fun shouldHideNumerical() = true
+    override fun getEmptyMessage() = R.string.no_boolean_habits
 }
 
 class NumericalHabitPickerDialog : HabitPickerDialog() {
     override fun shouldHideBoolean() = true
+    override fun getEmptyMessage() = R.string.no_numerical_habits
 }
 
 open class HabitPickerDialog : Activity() {
@@ -46,6 +48,7 @@ open class HabitPickerDialog : Activity() {
 
     protected open fun shouldHideNumerical() = false
     protected open fun shouldHideBoolean() = false
+    protected open fun getEmptyMessage() = R.string.no_habits
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -66,6 +69,12 @@ open class HabitPickerDialog : Activity() {
             habitNames.add(h.name)
         }
 
+        if (habitNames.isEmpty()) {
+            setContentView(R.layout.widget_empty_activity)
+            findViewById<TextView>(R.id.message).setText(getEmptyMessage())
+            return;
+        }
+
         setContentView(R.layout.widget_configure_activity)
         val listView = findViewById<ListView>(R.id.listView)
         val saveButton = findViewById<Button>(R.id.buttonSave)

android/uhabits-android/src/main/res/layout/widget_empty_activity.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2016-2020 Álinson Santos Xavier <isoron@gmail.com>
+  ~
+  ~ This file is part of Loop Habit Tracker.
+  ~
+  ~ Loop Habit Tracker is free software: you can redistribute it and/or modify
+  ~ it under the terms of the GNU General Public License as published by the
+  ~ Free Software Foundation, either version 3 of the License, or (at your
+  ~ option) any later version.
+  ~
+  ~ Loop Habit Tracker is distributed in the hope that it will be useful, but
+  ~ WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+  ~ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  ~ more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along
+  ~ with this program. If not, see <http://www.gnu.org/licenses/>.
+  -->
+
+<FrameLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content">
+
+    <TextView
+        android:id="@+id/message"
+        android:layout_width="250dp"
+        android:layout_height="150dp"
+        android:textSize="@dimen/regularTextSize"
+        android:text="@string/no_habits"
+        android:gravity="center"
+        />
+
+</FrameLayout>

android/uhabits-android/src/main/res/values/strings.xml

@@ -194,4 +194,7 @@
     <string name="every_month">Every month</string>
     <string name="validation_cannot_be_blank">Cannot be blank</string>
     <string name="today">Today</string>
+    <string name="no_habits">No habits found</string>
+    <string name="no_numerical_habits">No measurable habits found</string>
+    <string name="no_boolean_habits">No yes-or-no habits found</string>
 </resources>

android/uhabits-android/src/main/res/xml/widget_streak_info.xml

@@ -27,7 +27,7 @@
                     android:previewImage="@drawable/widget_preview_streaks"
                     android:resizeMode="vertical|horizontal"
                     android:updatePeriodMillis="3600000"
-                    android:configure="org.isoron.uhabits.widgets.activities.NumericalHabitPickerDialog"
+                    android:configure="org.isoron.uhabits.widgets.activities.BooleanHabitPickerDialog"
                     android:widgetCategory="home_screen">
 
 </appwidget-provider>

android/uhabits-android/src/main/res/xml/widget_target_info.xml

@@ -27,7 +27,7 @@
                     android:previewImage="@drawable/widget_preview_target"
                     android:resizeMode="vertical|horizontal"
                     android:updatePeriodMillis="3600000"
-                    android:configure="org.isoron.uhabits.widgets.activities.BooleanHabitPickerDialog"
+                    android:configure="org.isoron.uhabits.widgets.activities.NumericalHabitPickerDialog"
                     android:widgetCategory="home_screen">
 
 </appwidget-provider>