Added search floating action button to Overview and Categories screen.

Both times it launches the AppListActivity with an empty search box
focussed.

app/src/main/java/org/fdroid/fdroid/views/main/CategoriesViewBinder.java

@@ -1,7 +1,9 @@
 package org.fdroid.fdroid.views.main;
 
+import android.content.Intent;
 import android.database.Cursor;
 import android.os.Bundle;
+import android.support.design.widget.FloatingActionButton;
 import android.support.v4.app.LoaderManager;
 import android.support.v4.content.CursorLoader;
 import android.support.v4.content.Loader;
@@ -14,6 +16,7 @@ import android.widget.FrameLayout;
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.data.CategoryProvider;
 import org.fdroid.fdroid.data.Schema;
+import org.fdroid.fdroid.views.apps.AppListActivity;
 import org.fdroid.fdroid.views.categories.CategoryAdapter;
 
 /**
@@ -28,7 +31,7 @@ class CategoriesViewBinder implements LoaderManager.LoaderCallbacks<Cursor> {
     private final CategoryAdapter categoryAdapter;
     private final AppCompatActivity activity;
 
-    CategoriesViewBinder(AppCompatActivity activity, FrameLayout parent) {
+    CategoriesViewBinder(final AppCompatActivity activity, FrameLayout parent) {
         this.activity = activity;
 
         View categoriesView = activity.getLayoutInflater().inflate(R.layout.main_tab_categories, parent, true);
@@ -40,6 +43,14 @@ class CategoriesViewBinder implements LoaderManager.LoaderCallbacks<Cursor> {
         categoriesList.setLayoutManager(new LinearLayoutManager(activity));
         categoriesList.setAdapter(categoryAdapter);
 
+        FloatingActionButton searchFab = (FloatingActionButton) categoriesView.findViewById(R.id.btn_search);
+        searchFab.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                activity.startActivity(new Intent(activity, AppListActivity.class));
+            }
+        });
+
         activity.getSupportLoaderManager().initLoader(LOADER_ID, null, this);
     }
 

app/src/main/java/org/fdroid/fdroid/views/main/WhatsNewViewBinder.java

@@ -1,7 +1,9 @@
 package org.fdroid.fdroid.views.main;
 
+import android.content.Intent;
 import android.database.Cursor;
 import android.os.Bundle;
+import android.support.design.widget.FloatingActionButton;
 import android.support.v4.app.LoaderManager;
 import android.support.v4.content.CursorLoader;
 import android.support.v4.content.Loader;
@@ -16,6 +18,7 @@ import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.UpdateService;
 import org.fdroid.fdroid.data.AppProvider;
 import org.fdroid.fdroid.data.Schema;
+import org.fdroid.fdroid.views.apps.AppListActivity;
 import org.fdroid.fdroid.views.whatsnew.WhatsNewAdapter;
 
 /**
@@ -52,6 +55,14 @@ class WhatsNewViewBinder implements LoaderManager.LoaderCallbacks<Cursor> {
             }
         });
 
+        FloatingActionButton searchFab = (FloatingActionButton) whatsNewView.findViewById(R.id.btn_search);
+        searchFab.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                activity.startActivity(new Intent(activity, AppListActivity.class));
+            }
+        });
+
         activity.getSupportLoaderManager().initLoader(LOADER_ID, null, this);
     }
 

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

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.design.widget.FloatingActionButton
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/btn_search"
+    android:src="@drawable/ic_search_white"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:layout_gravity="bottom|end"
+    android:layout_marginBottom="@dimen/fab_margin"
+    android:layout_marginEnd="@dimen/fab_margin"
+    android:layout_marginRight="@dimen/fab_margin" />

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

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<android.support.design.widget.CoordinatorLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:orientation="vertical"
@@ -16,4 +17,6 @@
         app:layout_constraintTop_toTopOf="parent"
         android:scrollbars="vertical" />
 
-</LinearLayout>
+    <include layout="@layout/fab_search" />
+
+</android.support.design.widget.CoordinatorLayout>

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

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<android.support.design.widget.CoordinatorLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:orientation="vertical"
@@ -23,4 +24,6 @@
 
     </android.support.v4.widget.SwipeRefreshLayout>
 
-</LinearLayout>
+    <include layout="@layout/fab_search" />
+
+</android.support.design.widget.CoordinatorLayout>

app/src/main/res/values-sw720dp-v21/dimens.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- The material design specs indicate a 24dp margin on tablets should be used (hence this
+         file differing from values-v21/dimens.xml):
+         https://material.google.com/components/buttons-floating-action-button.html -->
+    <dimen name="fab_margin">24dp</dimen>
+</resources>

app/src/main/res/values/dimens.xml

@@ -18,6 +18,8 @@
     <!-- The selected item stands out from the background by this elevation -->
     <dimen name="details_screenshot_selected_elevation">3dp</dimen>
 
+    <dimen name="fab_margin">16dp</dimen>
+
     <dimen name="whats_new__padding__app_card__horizontal">12dp</dimen>
     <dimen name="whats_new__padding__app_card__vertical">10dp</dimen>