1 files changed, 130 insertions, 0 deletions
diff --git a/src/com/android/packageinstaller/permission/ui/PermissionsFrameFragment.java b/src/com/android/packageinstaller/permission/ui/PermissionsFrameFragment.java
new file mode 100644
index 00000000..2abdbd2a
--- /dev/null
+++ b/src/com/android/packageinstaller/permission/ui/PermissionsFrameFragment.java
@@ -0,0 +1,130 @@
+package com.android.packageinstaller.permission.ui;
+
+import android.annotation.Nullable;
+import android.content.res.Configuration;
+import android.os.Bundle;
+import android.support.v14.preference.PreferenceFragment;
+import android.support.v17.leanback.widget.VerticalGridView;
+import android.support.v7.preference.PreferenceScreen;
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.RecyclerView.AdapterDataObserver;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import com.android.packageinstaller.R;
+
+public abstract class PermissionsFrameFragment extends PreferenceFragment {
+
+    private static final float WINDOW_ALIGNMENT_OFFSET_PERCENT = 50;
+
+    private ViewGroup mPreferencesContainer;
+
+    // TV-specific instance variables
+    @Nullable private VerticalGridView mGridView;
+
+    /**
+     * Returns the view group that holds the preferences objects. This will
+     * only be set after {@link #onCreateView} has been called.
+     */
+    protected final ViewGroup getPreferencesContainer() {
+        return mPreferencesContainer;
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+            Bundle savedInstanceState) {
+        ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.permissions_frame, container,
+                        false);
+        ViewGroup prefsContainer = (ViewGroup) rootView.findViewById(R.id.prefs_container);
+        if (prefsContainer == null) {
+            prefsContainer = rootView;
+        }
+        mPreferencesContainer = (ViewGroup) super.onCreateView(
+                inflater, prefsContainer, savedInstanceState);
+        prefsContainer.addView(mPreferencesContainer);
+        return rootView;
+    }
+
+    @Override
+    public void onCreatePreferences(@Nullable Bundle savedInstanceState, String rootKey) {
+        PreferenceScreen preferences = getPreferenceScreen();
+        if (preferences == null) {
+            preferences = getPreferenceManager().createPreferenceScreen(getActivity());
+            setPreferenceScreen(preferences);
+        }
+    }
+
+    @Override
+    public RecyclerView onCreateRecyclerView(LayoutInflater inflater, ViewGroup parent,
+            Bundle savedInstanceState) {
+        int uiMode = getResources().getConfiguration().uiMode;
+        if ((uiMode & Configuration.UI_MODE_TYPE_MASK) == Configuration.UI_MODE_TYPE_TELEVISION) {
+            mGridView = (VerticalGridView) inflater.inflate(
+                    R.layout.leanback_preferences_list, parent, false);
+            mGridView.setWindowAlignmentOffset(0);
+            mGridView.setWindowAlignmentOffsetPercent(WINDOW_ALIGNMENT_OFFSET_PERCENT);
+            mGridView.setWindowAlignment(VerticalGridView.WINDOW_ALIGN_NO_EDGE);
+            mGridView.setFocusScrollStrategy(VerticalGridView.FOCUS_SCROLL_ALIGNED);
+            return mGridView;
+        } else {
+            return super.onCreateRecyclerView(inflater, parent, savedInstanceState);
+        }
+    }
+
+    @Override
+    protected RecyclerView.Adapter<?> onCreateAdapter(PreferenceScreen preferenceScreen) {
+        final RecyclerView.Adapter<?> adapter = super.onCreateAdapter(preferenceScreen);
+
+        if (adapter != null) {
+            final TextView emptyView = (TextView) getView().findViewById(R.id.no_permissions);
+            onSetEmptyText(emptyView);
+            final RecyclerView recyclerView = getListView();
+            adapter.registerAdapterDataObserver(new AdapterDataObserver() {
+                @Override
+                public void onChanged() {
+                    checkEmpty();
+                }
+
+                @Override
+                public void onItemRangeInserted(int positionStart, int itemCount) {
+                    checkEmpty();
+                }
+
+                @Override
+                public void onItemRangeRemoved(int positionStart, int itemCount) {
+                    checkEmpty();
+                }
+
+                private void checkEmpty() {
+                    boolean isEmpty = adapter.getItemCount() == 0;
+                    emptyView.setVisibility(isEmpty ? View.VISIBLE : View.GONE);
+                    recyclerView.setVisibility(isEmpty ? View.GONE : View.VISIBLE);
+                    if (!isEmpty && mGridView != null) {
+                        mGridView.requestFocus();
+                    }
+                }
+            });
+
+            boolean isEmpty = adapter.getItemCount() == 0;
+            emptyView.setVisibility(isEmpty ? View.VISIBLE : View.GONE);
+            recyclerView.setVisibility(isEmpty ? View.GONE : View.VISIBLE);
+            if (!isEmpty && mGridView != null) {
+                mGridView.requestFocus();
+            }
+        }
+
+        return adapter;
+    }
+
+    /**
+     * Hook for subclasses to change the default text of the empty view.
+     * Base implementation leaves the default empty view text.
+     *
+     * @param textView the empty text view
+     */
+    protected void onSetEmptyText(TextView textView) {
+    }
+}
+