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 androidx.leanback.preference; 18 19 import android.app.Fragment; 20 import android.os.Build; 21 import android.os.Bundle; 22 23 import androidx.preference.DialogPreference; 24 25 public class LeanbackPreferenceDialogFragment extends Fragment { 26 27 public static final String ARG_KEY = "key"; 28 29 private DialogPreference mPreference; 30 31 public LeanbackPreferenceDialogFragment() { 32 if (Build.VERSION.SDK_INT >= 21) { 33 LeanbackPreferenceFragmentTransitionHelperApi21.addTransitions(this); 34 } 35 } 36 37 @Override 38 public void onCreate(Bundle savedInstanceState) { 39 super.onCreate(savedInstanceState); 40 41 final Fragment rawFragment = getTargetFragment(); 42 if (!(rawFragment instanceof DialogPreference.TargetFragment)) { 43 throw new IllegalStateException("Target fragment " + rawFragment 44 + " must implement TargetFragment interface"); 45 } 46 } 47 48 public DialogPreference getPreference() { 49 if (mPreference == null) { 50 final String key = getArguments().getString(ARG_KEY); 51 final DialogPreference.TargetFragment fragment = 52 (DialogPreference.TargetFragment) getTargetFragment(); 53 mPreference = (DialogPreference) fragment.findPreference(key); 54 } 55 return mPreference; 56 } 57 } 58
