1 /* 2 * Copyright (C) 2011 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 com.android.dialer.util; 18 19 import android.app.LoaderManager.LoaderCallbacks; 20 import android.content.Context; 21 import android.content.Loader; 22 import android.os.Bundle; 23 24 /** 25 * A {@link Loader} only used to make use of the {@link android.app.Fragment#setStartDeferred} 26 * feature from an old-style fragment which doesn't use {@link Loader}s to load data. 27 * 28 * This loader never delivers results. A caller fragment must destroy it when deferred fragments 29 * should be started. 30 */ 31 public class EmptyLoader extends Loader<Object> { 32 public EmptyLoader(Context context) { 33 super(context); 34 } 35 36 /** 37 * {@link LoaderCallbacks} which just generates {@link EmptyLoader}. {@link #onLoadFinished} 38 * and {@link #onLoaderReset} are no-op. 39 */ 40 public static class Callback implements LoaderCallbacks<Object> { 41 private final Context mContext; 42 43 public Callback(Context context) { 44 mContext = context.getApplicationContext(); 45 } 46 47 @Override 48 public Loader<Object> onCreateLoader(int id, Bundle args) { 49 return new EmptyLoader(mContext); 50 } 51 52 @Override 53 public void onLoadFinished(Loader<Object> loader, Object data) { 54 } 55 56 @Override 57 public void onLoaderReset(Loader<Object> loader) { 58 } 59 } 60 } 61
