Fix filter dialog on old Android versions

app/src/main/java/de/danoeh/antennapod/dialog/FilterDialog.java

@@ -3,6 +3,7 @@ package de.danoeh.antennapod.dialog;
 import android.content.Context;
 import android.text.TextUtils;
 import android.view.LayoutInflater;
+import android.view.View;
 import android.widget.LinearLayout;
 import android.widget.RadioButton;
 
@@ -34,18 +35,19 @@ public abstract class FilterDialog {
         builder.setTitle(R.string.filter);
 
         LayoutInflater inflater = LayoutInflater.from(this.context);
-        LinearLayout layout = (LinearLayout) inflater.inflate(R.layout.filter_dialog, null, false);
+        View layout = inflater.inflate(R.layout.filter_dialog, null, false);
+        LinearLayout rows = layout.findViewById(R.id.filter_rows);
         builder.setView(layout);
 
         for (FeedItemFilterGroup item : FeedItemFilterGroup.values()) {
-            RecursiveRadioGroup row = (RecursiveRadioGroup) inflater.inflate(R.layout.filter_dialog_row, null);
+            RecursiveRadioGroup row = (RecursiveRadioGroup) inflater.inflate(R.layout.filter_dialog_row, null, false);
             RadioButton filter1 = row.findViewById(R.id.filter_dialog_radioButton1);
             RadioButton filter2 = row.findViewById(R.id.filter_dialog_radioButton2);
             filter1.setText(item.values[0].displayName);
             filter1.setTag(item.values[0].filterId);
             filter2.setText(item.values[1].displayName);
             filter2.setTag(item.values[1].filterId);
-            layout.addView(row);
+            rows.addView(row);
         }
 
         for (String filterId : filterValues) {
@@ -56,11 +58,11 @@ public abstract class FilterDialog {
 
         builder.setPositiveButton(R.string.confirm_label, (dialog, which) -> {
             filterValues.clear();
-            for (int i = 0; i < layout.getChildCount(); i++) {
+            for (int i = 0; i < rows.getChildCount(); i++) {
-                if (!(layout.getChildAt(i) instanceof RecursiveRadioGroup)) {
+                if (!(rows.getChildAt(i) instanceof RecursiveRadioGroup)) {
                     continue;
                 }
-                RecursiveRadioGroup group = (RecursiveRadioGroup) layout.getChildAt(i);
+                RecursiveRadioGroup group = (RecursiveRadioGroup) rows.getChildAt(i);
                 if (group.getCheckedButton() != null) {
                     String tag = (String) group.getCheckedButton().getTag();
                     if (tag != null) { // Clear buttons use no tag

app/src/main/java/de/danoeh/antennapod/dialog/SubscriptionsFilterDialog.java

@@ -30,7 +30,8 @@ public class SubscriptionsFilterDialog {
         builder.setTitle(context.getString(R.string.pref_filter_feed_title));
 
         LayoutInflater inflater = LayoutInflater.from(context);
-        LinearLayout layout = (LinearLayout) inflater.inflate(R.layout.filter_dialog, null, false);
+        View layout = inflater.inflate(R.layout.filter_dialog, null, false);
+        LinearLayout rows = layout.findViewById(R.id.filter_rows);
         builder.setView(layout);
 
         for (SubscriptionsFilterGroup item : SubscriptionsFilterGroup.values()) {
@@ -45,7 +46,7 @@ public class SubscriptionsFilterDialog {
             } else {
                 filter2.setVisibility(View.GONE);
             }
-            layout.addView(row);
+            rows.addView(row);
         }
 
         for (String filterId : filterValues) {
@@ -56,11 +57,11 @@ public class SubscriptionsFilterDialog {
 
         builder.setPositiveButton(R.string.confirm_label, (dialog, which) -> {
             filterValues.clear();
-            for (int i = 0; i < layout.getChildCount(); i++) {
+            for (int i = 0; i < rows.getChildCount(); i++) {
-                if (!(layout.getChildAt(i) instanceof RecursiveRadioGroup)) {
+                if (!(rows.getChildAt(i) instanceof RecursiveRadioGroup)) {
                     continue;
                 }
-                RecursiveRadioGroup group = (RecursiveRadioGroup) layout.getChildAt(i);
+                RecursiveRadioGroup group = (RecursiveRadioGroup) rows.getChildAt(i);
                 if (group.getCheckedButton() != null) {
                     String tag = (String) group.getCheckedButton().getTag();
                     if (tag != null) { // Clear buttons use no tag

app/src/main/res/layout/filter_dialog.xml

@@ -1,11 +1,15 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="match_parent"
+        android:layout_width="match_parent"
-    android:layout_height="match_parent"
+        android:layout_height="match_parent">
-    android:orientation="vertical"
+    <LinearLayout
-    android:paddingLeft="24dp"
+            android:id="@+id/filter_rows"
-    android:paddingTop="24dp"
+            android:layout_width="match_parent"
-    android:paddingRight="24dp"
+            android:layout_height="wrap_content"
-    android:paddingBottom="8dp">
+            android:orientation="vertical"
-
+            android:paddingLeft="24dp"
-</LinearLayout>
+            android:paddingTop="24dp"
+            android:paddingRight="24dp"
+            android:paddingBottom="8dp">
+    </LinearLayout>
+</ScrollView>

app/src/main/res/layout/filter_dialog_row.xml

@@ -28,7 +28,7 @@
                 android:layout_marginRight="2dp"
                 android:layout_weight="1"
                 android:background="?attr/filter_dialog_button_background"
-                android:button="@android:color/transparent"
+                style="@style/NoButtonRadio"
                 android:foreground="?android:attr/selectableItemBackground"
                 android:checked="false"
                 android:gravity="center"
@@ -40,7 +40,7 @@
                 android:layout_height="match_parent"
                 android:layout_weight="1"
                 android:background="?attr/filter_dialog_button_background"
-                android:button="@android:color/transparent"
+                style="@style/NoButtonRadio"
                 android:foreground="?android:attr/selectableItemBackground"
                 android:checked="false"
                 android:gravity="center"
@@ -53,7 +53,7 @@
         android:layout_width="48dp"
         android:layout_height="48dp"
         android:background="@drawable/ic_filter_close"
-        android:button="@android:color/transparent"
+        style="@style/NoButtonRadio"
         android:foreground="?android:attr/selectableItemBackground"
         android:layout_gravity="center_vertical"
         android:checked="true" />

core/src/main/res/drawable-v21/ic_filter_close.xml

@@ -0,0 +1,55 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <item
+        android:bottom="5dp"
+        android:left="5dp"
+        android:right="5dp"
+        android:top="5dp">
+
+        <shape android:shape="oval">
+            <stroke
+                android:width="4dp"
+                android:color="?attr/filter_dialog_clear" />
+        </shape>
+    </item>
+
+    <!-- x -->
+    <item
+        android:bottom="12dp"
+        android:left="12dp"
+        android:right="12dp"
+        android:top="12dp">
+        <rotate
+            android:fromDegrees="135"
+            android:pivotX="50%"
+            android:pivotY="50%"
+            android:toDegrees="135">
+            <shape android:shape="line">
+                <stroke
+                    android:width="4dp"
+                    android:color="?attr/filter_dialog_clear" />
+            </shape>
+        </rotate>
+    </item>
+
+    <item
+        android:bottom="12dp"
+        android:left="12dp"
+        android:right="12dp"
+        android:top="12dp">
+        <rotate
+            android:fromDegrees="45"
+            android:pivotX="50%"
+            android:pivotY="50%"
+            android:toDegrees="45">
+            <shape android:shape="line">
+                <stroke
+                    android:width="4dp"
+                    android:color="?attr/filter_dialog_clear" />
+            </shape>
+
+        </rotate>
+    </item>
+
+</layer-list>

core/src/main/res/drawable/ic_filter_close.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
-
+    <!-- Fall-back for old Android devices that do not support attrs as colors -->
     <item
         android:bottom="5dp"
         android:left="5dp"
@@ -10,7 +10,7 @@
         <shape android:shape="oval">
             <stroke
                 android:width="4dp"
-                android:color="?attr/filter_dialog_clear" />
+                android:color="#555" />
         </shape>
     </item>
 
@@ -28,7 +28,7 @@
             <shape android:shape="line">
                 <stroke
                     android:width="4dp"
-                    android:color="?attr/filter_dialog_clear" />
+                    android:color="#555" />
             </shape>
         </rotate>
     </item>
@@ -46,7 +46,7 @@
             <shape android:shape="line">
                 <stroke
                     android:width="4dp"
-                    android:color="?attr/filter_dialog_clear" />
+                    android:color="#555" />
             </shape>
 
         </rotate>

core/src/main/res/values/attrs.xml

@@ -58,7 +58,7 @@
     <attr name="action_icon_color" format="color"/>
     <attr name="scrollbar_thumb" format="reference"/>
     <attr name="background_elevated" format="color"/>
-    <attr name="filter_dialog_clear" format="reference"/>
+    <attr name="filter_dialog_clear" format="color"/>
     <attr name="filter_dialog_button_background" format="reference"/>
     <attr name="ic_notifications" format="reference"/>
 

core/src/main/res/values/styles.xml

@@ -318,4 +318,9 @@
         <item name="android:clickable">true</item>
     </style>
 
+    <style name="NoButtonRadio" parent="Widget.MaterialComponents.CompoundButton.RadioButton">
+        <item name="buttonCompat">@null</item> <!-- For Android 4.4 -->
+        <item name="android:button">@null</item>
+    </style>
+
 </resources>