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commit 6bc8f61b18
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+/* Copyright (c) 2019-2021, Arm Limited and Contributors
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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.
+ */
+
+package com.khronos.vulkan_samples;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentStatePagerAdapter;
+import android.view.ViewGroup;
+import android.widget.AdapterView;
+
+import com.khronos.vulkan_samples.model.Sample;
+import com.khronos.vulkan_samples.model.SampleStore;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+public class ViewPagerAdapter extends FragmentStatePagerAdapter {
+    private TabFragment currentFragment;
+
+    private List<Sample> viewableSamples = new ArrayList<>();
+
+    private final SampleStore samples;
+
+    private final AdapterView.OnItemClickListener clickListener;
+
+    public ViewPagerAdapter(FragmentManager manager, SampleStore samples, AdapterView.OnItemClickListener clickListener) {
+        super(manager);
+        this.samples = samples;
+        this.clickListener = clickListener;
+        applyFilter(samples.getTags());
+    }
+
+    public void setDialog(FilterDialog dialog) {
+        dialog.setup(this, samples.getTags());
+    }
+
+    /**
+     * Modifies the filter so that the viewableSamples updates
+     */
+    public void applyFilter(List<String> filterTags) {
+        viewableSamples = new ArrayList<>(samples.getByTags(filterTags));
+    }
+
+    @NonNull
+    @Override
+    public Fragment getItem(int position) {
+        List<Sample> fragmentSamples = new ArrayList<>();
+
+        String category = samples.getCategories().get(position);
+        assert category != null;
+
+        for (Sample sample : Objects.requireNonNull(samples.getByCategory(category))) {
+            for (Sample viewableSample : this.viewableSamples) {
+                if (sample.equals(viewableSample)) {
+                    fragmentSamples.add(sample);
+                }
+            }
+        }
+
+        return TabFragment.getInstance(category, fragmentSamples, clickListener);
+    }
+
+    public int getItemPosition(@NonNull Object object) {
+        return POSITION_NONE;
+    }
+
+    @Override
+    public void setPrimaryItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
+        if (getCurrentFragment() != object) {
+            currentFragment = (TabFragment) object;
+        }
+        super.setPrimaryItem(container, position, object);
+    }
+
+    @Override
+    public int getCount() {
+        return samples.getCategoryIndex().size();
+    }
+
+    @Override
+    public CharSequence getPageTitle(int position) {
+        return samples.getCategories().get(position);
+    }
+
+    TabFragment getCurrentFragment() {
+        return currentFragment;
+    }
+}