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 17package android.support.v14.preference; 18 19import android.app.AlertDialog; 20import android.content.DialogInterface; 21import android.os.Bundle; 22import android.support.annotation.NonNull; 23 24import java.util.ArrayList; 25import java.util.HashSet; 26import java.util.Set; 27 28public class MultiSelectListPreferenceDialogFragment extends PreferenceDialogFragment { 29 30 private static final String SAVE_STATE_VALUES = 31 "MultiSelectListPreferenceDialogFragment.values"; 32 private static final String SAVE_STATE_CHANGED = 33 "MultiSelectListPreferenceDialogFragment.changed"; 34 private static final String SAVE_STATE_ENTRIES = 35 "MultiSelectListPreferenceDialogFragment.entries"; 36 private static final String SAVE_STATE_ENTRY_VALUES = 37 "MultiSelectListPreferenceDialogFragment.entryValues"; 38 39 private Set<String> mNewValues = new HashSet<>(); 40 private boolean mPreferenceChanged; 41 private CharSequence[] mEntries; 42 private CharSequence[] mEntryValues; 43 44 public static MultiSelectListPreferenceDialogFragment newInstance(String key) { 45 final MultiSelectListPreferenceDialogFragment fragment = 46 new MultiSelectListPreferenceDialogFragment(); 47 final Bundle b = new Bundle(1); 48 b.putString(ARG_KEY, key); 49 fragment.setArguments(b); 50 return fragment; 51 } 52 53 @Override 54 public void onCreate(Bundle savedInstanceState) { 55 super.onCreate(savedInstanceState); 56 57 if (savedInstanceState == null) { 58 final MultiSelectListPreference preference = getListPreference(); 59 60 if (preference.getEntries() == null || preference.getEntryValues() == null) { 61 throw new IllegalStateException( 62 "MultiSelectListPreference requires an entries array and " + 63 "an entryValues array."); 64 } 65 66 mNewValues.clear(); 67 mNewValues.addAll(preference.getValues()); 68 mPreferenceChanged = false; 69 mEntries = preference.getEntries(); 70 mEntryValues = preference.getEntryValues(); 71 } else { 72 mNewValues.clear(); 73 mNewValues.addAll(savedInstanceState.getStringArrayList(SAVE_STATE_VALUES)); 74 mPreferenceChanged = savedInstanceState.getBoolean(SAVE_STATE_CHANGED, false); 75 mEntries = savedInstanceState.getCharSequenceArray(SAVE_STATE_ENTRIES); 76 mEntryValues = savedInstanceState.getCharSequenceArray(SAVE_STATE_ENTRY_VALUES); 77 } 78 } 79 80 @Override 81 public void onSaveInstanceState(@NonNull Bundle outState) { 82 super.onSaveInstanceState(outState); 83 outState.putStringArrayList(SAVE_STATE_VALUES, new ArrayList<>(mNewValues)); 84 outState.putBoolean(SAVE_STATE_CHANGED, mPreferenceChanged); 85 outState.putCharSequenceArray(SAVE_STATE_ENTRIES, mEntries); 86 outState.putCharSequenceArray(SAVE_STATE_ENTRY_VALUES, mEntryValues); 87 } 88 89 private MultiSelectListPreference getListPreference() { 90 return (MultiSelectListPreference) getPreference(); 91 } 92 93 @Override 94 protected void onPrepareDialogBuilder(AlertDialog.Builder builder) { 95 super.onPrepareDialogBuilder(builder); 96 97 final int entryCount = mEntryValues.length; 98 final boolean[] checkedItems = new boolean[entryCount]; 99 for (int i = 0; i < entryCount; i++) { 100 checkedItems[i] = mNewValues.contains(mEntryValues[i].toString()); 101 } 102 builder.setMultiChoiceItems(mEntries, checkedItems, 103 new DialogInterface.OnMultiChoiceClickListener() { 104 public void onClick(DialogInterface dialog, int which, boolean isChecked) { 105 if (isChecked) { 106 mPreferenceChanged |= mNewValues.add( 107 mEntryValues[which].toString()); 108 } else { 109 mPreferenceChanged |= mNewValues.remove( 110 mEntryValues[which].toString()); 111 } 112 } 113 }); 114 } 115 116 @Override 117 public void onDialogClosed(boolean positiveResult) { 118 final MultiSelectListPreference preference = getListPreference(); 119 if (positiveResult && mPreferenceChanged) { 120 final Set<String> values = mNewValues; 121 if (preference.callChangeListener(values)) { 122 preference.setValues(values); 123 } 124 } 125 mPreferenceChanged = false; 126 } 127 128} 129