1/* 2 * Copyright (C) 2016 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.v7.preference; 18 19import android.content.DialogInterface; 20import android.os.Bundle; 21import android.support.annotation.NonNull; 22import android.support.v7.app.AlertDialog; 23import android.support.v7.preference.internal.AbstractMultiSelectListPreference; 24 25import java.util.ArrayList; 26import java.util.HashSet; 27import java.util.Set; 28 29public class MultiSelectListPreferenceDialogFragmentCompat extends PreferenceDialogFragmentCompat { 30 31 private static final String SAVE_STATE_VALUES = 32 "MultiSelectListPreferenceDialogFragmentCompat.values"; 33 private static final String SAVE_STATE_CHANGED = 34 "MultiSelectListPreferenceDialogFragmentCompat.changed"; 35 private static final String SAVE_STATE_ENTRIES = 36 "MultiSelectListPreferenceDialogFragmentCompat.entries"; 37 private static final String SAVE_STATE_ENTRY_VALUES = 38 "MultiSelectListPreferenceDialogFragmentCompat.entryValues"; 39 40 private Set<String> mNewValues = new HashSet<>(); 41 private boolean mPreferenceChanged; 42 private CharSequence[] mEntries; 43 private CharSequence[] mEntryValues; 44 45 public static MultiSelectListPreferenceDialogFragmentCompat newInstance(String key) { 46 final MultiSelectListPreferenceDialogFragmentCompat fragment = 47 new MultiSelectListPreferenceDialogFragmentCompat(); 48 final Bundle b = new Bundle(1); 49 b.putString(ARG_KEY, key); 50 fragment.setArguments(b); 51 return fragment; 52 } 53 54 @Override 55 public void onCreate(Bundle savedInstanceState) { 56 super.onCreate(savedInstanceState); 57 58 if (savedInstanceState == null) { 59 final AbstractMultiSelectListPreference preference = getListPreference(); 60 61 if (preference.getEntries() == null || preference.getEntryValues() == null) { 62 throw new IllegalStateException( 63 "MultiSelectListPreference requires an entries array and " + 64 "an entryValues array."); 65 } 66 67 mNewValues.clear(); 68 mNewValues.addAll(preference.getValues()); 69 mPreferenceChanged = false; 70 mEntries = preference.getEntries(); 71 mEntryValues = preference.getEntryValues(); 72 } else { 73 mNewValues.clear(); 74 mNewValues.addAll(savedInstanceState.getStringArrayList(SAVE_STATE_VALUES)); 75 mPreferenceChanged = savedInstanceState.getBoolean(SAVE_STATE_CHANGED, false); 76 mEntries = savedInstanceState.getCharSequenceArray(SAVE_STATE_ENTRIES); 77 mEntryValues = savedInstanceState.getCharSequenceArray(SAVE_STATE_ENTRY_VALUES); 78 } 79 } 80 81 @Override 82 public void onSaveInstanceState(@NonNull Bundle outState) { 83 super.onSaveInstanceState(outState); 84 outState.putStringArrayList(SAVE_STATE_VALUES, new ArrayList<>(mNewValues)); 85 outState.putBoolean(SAVE_STATE_CHANGED, mPreferenceChanged); 86 outState.putCharSequenceArray(SAVE_STATE_ENTRIES, mEntries); 87 outState.putCharSequenceArray(SAVE_STATE_ENTRY_VALUES, mEntryValues); 88 } 89 90 private AbstractMultiSelectListPreference getListPreference() { 91 return (AbstractMultiSelectListPreference) getPreference(); 92 } 93 94 @Override 95 protected void onPrepareDialogBuilder(AlertDialog.Builder builder) { 96 super.onPrepareDialogBuilder(builder); 97 98 final int entryCount = mEntryValues.length; 99 final boolean[] checkedItems = new boolean[entryCount]; 100 for (int i = 0; i < entryCount; i++) { 101 checkedItems[i] = mNewValues.contains(mEntryValues[i].toString()); 102 } 103 builder.setMultiChoiceItems(mEntries, checkedItems, 104 new DialogInterface.OnMultiChoiceClickListener() { 105 public void onClick(DialogInterface dialog, int which, boolean isChecked) { 106 if (isChecked) { 107 mPreferenceChanged |= mNewValues.add( 108 mEntryValues[which].toString()); 109 } else { 110 mPreferenceChanged |= mNewValues.remove( 111 mEntryValues[which].toString()); 112 } 113 } 114 }); 115 } 116 117 @Override 118 public void onDialogClosed(boolean positiveResult) { 119 final AbstractMultiSelectListPreference preference = getListPreference(); 120 if (positiveResult && mPreferenceChanged) { 121 final Set<String> values = mNewValues; 122 if (preference.callChangeListener(values)) { 123 preference.setValues(values); 124 } 125 } 126 mPreferenceChanged = false; 127 } 128} 129