1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License 15 */ 16 17 package android.support.v17.preference; 18 19 import static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP; 20 21 import android.app.Fragment; 22 import android.os.Bundle; 23 import android.support.annotation.RestrictTo; 24 import android.support.v14.preference.PreferenceFragment; 25 import android.support.v17.leanback.widget.VerticalGridView; 26 import android.support.v7.preference.PreferenceRecyclerViewAccessibilityDelegate; 27 import android.support.v7.widget.RecyclerView; 28 import android.view.LayoutInflater; 29 import android.view.ViewGroup; 30 31 /** 32 * This fragment provides a preference fragment with leanback-style behavior, suitable for 33 * embedding into broader UI elements. 34 */ 35 public abstract class BaseLeanbackPreferenceFragment extends PreferenceFragment { 36 37 @Override onCreateRecyclerView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState)38 public RecyclerView onCreateRecyclerView(LayoutInflater inflater, ViewGroup parent, 39 Bundle savedInstanceState) { 40 VerticalGridView verticalGridView = (VerticalGridView) inflater 41 .inflate(R.layout.leanback_preferences_list, parent, false); 42 verticalGridView.setWindowAlignment(VerticalGridView.WINDOW_ALIGN_BOTH_EDGE); 43 verticalGridView.setFocusScrollStrategy(VerticalGridView.FOCUS_SCROLL_ALIGNED); 44 verticalGridView.setAccessibilityDelegateCompat( 45 new PreferenceRecyclerViewAccessibilityDelegate(verticalGridView)); 46 return verticalGridView; 47 } 48 49 /** 50 * @hide 51 */ 52 @RestrictTo(LIBRARY_GROUP) 53 @Override getCallbackFragment()54 public Fragment getCallbackFragment() { 55 return getParentFragment(); 56 } 57 } 58