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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) {
}
}
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