Adam Powell | 212db7d | 2010-04-08 16:24:46 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 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.preference; |
| 18 | |
| 19 | import android.app.AlertDialog.Builder; |
| 20 | import android.content.Context; |
| 21 | import android.content.DialogInterface; |
| 22 | import android.content.res.TypedArray; |
| 23 | import android.os.Parcel; |
| 24 | import android.os.Parcelable; |
| 25 | import android.util.AttributeSet; |
| 26 | |
| 27 | import java.util.HashSet; |
| 28 | import java.util.Set; |
| 29 | |
| 30 | /** |
| 31 | * A {@link Preference} that displays a list of entries as |
| 32 | * a dialog. |
| 33 | * <p> |
| 34 | * This preference will store a set of strings into the SharedPreferences. |
| 35 | * This set will contain one or more values from the |
| 36 | * {@link #setEntryValues(CharSequence[])} array. |
| 37 | * |
| 38 | * @attr ref android.R.styleable#MultiSelectListPreference_entries |
| 39 | * @attr ref android.R.styleable#MultiSelectListPreference_entryValues |
| 40 | */ |
| 41 | public class MultiSelectListPreference extends DialogPreference { |
| 42 | private CharSequence[] mEntries; |
| 43 | private CharSequence[] mEntryValues; |
| 44 | private Set<String> mValues = new HashSet<String>(); |
| 45 | private Set<String> mNewValues = new HashSet<String>(); |
| 46 | private boolean mPreferenceChanged; |
| 47 | |
| 48 | public MultiSelectListPreference(Context context, AttributeSet attrs) { |
| 49 | super(context, attrs); |
| 50 | |
| 51 | TypedArray a = context.obtainStyledAttributes(attrs, |
| 52 | com.android.internal.R.styleable.MultiSelectListPreference, 0, 0); |
| 53 | mEntries = a.getTextArray(com.android.internal.R.styleable.MultiSelectListPreference_entries); |
| 54 | mEntryValues = a.getTextArray(com.android.internal.R.styleable.MultiSelectListPreference_entryValues); |
| 55 | a.recycle(); |
| 56 | } |
| 57 | |
| 58 | public MultiSelectListPreference(Context context) { |
| 59 | this(context, null); |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * Sets the human-readable entries to be shown in the list. This will be |
| 64 | * shown in subsequent dialogs. |
| 65 | * <p> |
| 66 | * Each entry must have a corresponding index in |
| 67 | * {@link #setEntryValues(CharSequence[])}. |
| 68 | * |
| 69 | * @param entries The entries. |
| 70 | * @see #setEntryValues(CharSequence[]) |
| 71 | */ |
| 72 | public void setEntries(CharSequence[] entries) { |
| 73 | mEntries = entries; |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * @see #setEntries(CharSequence[]) |
| 78 | * @param entriesResId The entries array as a resource. |
| 79 | */ |
| 80 | public void setEntries(int entriesResId) { |
| 81 | setEntries(getContext().getResources().getTextArray(entriesResId)); |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * The list of entries to be shown in the list in subsequent dialogs. |
| 86 | * |
| 87 | * @return The list as an array. |
| 88 | */ |
| 89 | public CharSequence[] getEntries() { |
| 90 | return mEntries; |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * The array to find the value to save for a preference when an entry from |
| 95 | * entries is selected. If a user clicks on the second item in entries, the |
| 96 | * second item in this array will be saved to the preference. |
| 97 | * |
| 98 | * @param entryValues The array to be used as values to save for the preference. |
| 99 | */ |
| 100 | public void setEntryValues(CharSequence[] entryValues) { |
| 101 | mEntryValues = entryValues; |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * @see #setEntryValues(CharSequence[]) |
| 106 | * @param entryValuesResId The entry values array as a resource. |
| 107 | */ |
| 108 | public void setEntryValues(int entryValuesResId) { |
| 109 | setEntryValues(getContext().getResources().getTextArray(entryValuesResId)); |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Returns the array of values to be saved for the preference. |
| 114 | * |
| 115 | * @return The array of values. |
| 116 | */ |
| 117 | public CharSequence[] getEntryValues() { |
| 118 | return mEntryValues; |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * Sets the value of the key. This should contain entries in |
| 123 | * {@link #getEntryValues()}. |
| 124 | * |
| 125 | * @param values The values to set for the key. |
| 126 | */ |
| 127 | public void setValues(Set<String> values) { |
Amith Yamasani | cd9ea08 | 2012-05-15 17:17:24 -0700 | [diff] [blame] | 128 | mValues.clear(); |
| 129 | mValues.addAll(values); |
| 130 | |
Adam Powell | 212db7d | 2010-04-08 16:24:46 -0700 | [diff] [blame] | 131 | persistStringSet(values); |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * Retrieves the current value of the key. |
| 136 | */ |
| 137 | public Set<String> getValues() { |
| 138 | return mValues; |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * Returns the index of the given value (in the entry values array). |
| 143 | * |
| 144 | * @param value The value whose index should be returned. |
| 145 | * @return The index of the value, or -1 if not found. |
| 146 | */ |
| 147 | public int findIndexOfValue(String value) { |
| 148 | if (value != null && mEntryValues != null) { |
| 149 | for (int i = mEntryValues.length - 1; i >= 0; i--) { |
| 150 | if (mEntryValues[i].equals(value)) { |
| 151 | return i; |
| 152 | } |
| 153 | } |
| 154 | } |
| 155 | return -1; |
| 156 | } |
| 157 | |
| 158 | @Override |
| 159 | protected void onPrepareDialogBuilder(Builder builder) { |
| 160 | super.onPrepareDialogBuilder(builder); |
| 161 | |
| 162 | if (mEntries == null || mEntryValues == null) { |
| 163 | throw new IllegalStateException( |
| 164 | "MultiSelectListPreference requires an entries array and " + |
| 165 | "an entryValues array."); |
| 166 | } |
| 167 | |
| 168 | boolean[] checkedItems = getSelectedItems(); |
| 169 | builder.setMultiChoiceItems(mEntries, checkedItems, |
| 170 | new DialogInterface.OnMultiChoiceClickListener() { |
| 171 | public void onClick(DialogInterface dialog, int which, boolean isChecked) { |
| 172 | if (isChecked) { |
Justin Koh | ece60fb | 2011-04-07 19:40:29 -0700 | [diff] [blame] | 173 | mPreferenceChanged |= mNewValues.add(mEntryValues[which].toString()); |
Adam Powell | 212db7d | 2010-04-08 16:24:46 -0700 | [diff] [blame] | 174 | } else { |
Justin Koh | ece60fb | 2011-04-07 19:40:29 -0700 | [diff] [blame] | 175 | mPreferenceChanged |= mNewValues.remove(mEntryValues[which].toString()); |
Adam Powell | 212db7d | 2010-04-08 16:24:46 -0700 | [diff] [blame] | 176 | } |
| 177 | } |
| 178 | }); |
| 179 | mNewValues.clear(); |
| 180 | mNewValues.addAll(mValues); |
| 181 | } |
| 182 | |
| 183 | private boolean[] getSelectedItems() { |
Justin Koh | ece60fb | 2011-04-07 19:40:29 -0700 | [diff] [blame] | 184 | final CharSequence[] entries = mEntryValues; |
Adam Powell | 212db7d | 2010-04-08 16:24:46 -0700 | [diff] [blame] | 185 | final int entryCount = entries.length; |
| 186 | final Set<String> values = mValues; |
| 187 | boolean[] result = new boolean[entryCount]; |
| 188 | |
| 189 | for (int i = 0; i < entryCount; i++) { |
| 190 | result[i] = values.contains(entries[i].toString()); |
| 191 | } |
| 192 | |
| 193 | return result; |
| 194 | } |
| 195 | |
| 196 | @Override |
| 197 | protected void onDialogClosed(boolean positiveResult) { |
| 198 | super.onDialogClosed(positiveResult); |
| 199 | |
| 200 | if (positiveResult && mPreferenceChanged) { |
| 201 | final Set<String> values = mNewValues; |
| 202 | if (callChangeListener(values)) { |
| 203 | setValues(values); |
| 204 | } |
| 205 | } |
| 206 | mPreferenceChanged = false; |
| 207 | } |
| 208 | |
| 209 | @Override |
| 210 | protected Object onGetDefaultValue(TypedArray a, int index) { |
| 211 | final CharSequence[] defaultValues = a.getTextArray(index); |
| 212 | final int valueCount = defaultValues.length; |
| 213 | final Set<String> result = new HashSet<String>(); |
| 214 | |
| 215 | for (int i = 0; i < valueCount; i++) { |
| 216 | result.add(defaultValues[i].toString()); |
| 217 | } |
| 218 | |
| 219 | return result; |
| 220 | } |
| 221 | |
| 222 | @Override |
| 223 | protected void onSetInitialValue(boolean restoreValue, Object defaultValue) { |
| 224 | setValues(restoreValue ? getPersistedStringSet(mValues) : (Set<String>) defaultValue); |
| 225 | } |
| 226 | |
| 227 | @Override |
| 228 | protected Parcelable onSaveInstanceState() { |
| 229 | final Parcelable superState = super.onSaveInstanceState(); |
| 230 | if (isPersistent()) { |
| 231 | // No need to save instance state |
| 232 | return superState; |
| 233 | } |
| 234 | |
| 235 | final SavedState myState = new SavedState(superState); |
| 236 | myState.values = getValues(); |
| 237 | return myState; |
| 238 | } |
| 239 | |
| 240 | private static class SavedState extends BaseSavedState { |
| 241 | Set<String> values; |
| 242 | |
| 243 | public SavedState(Parcel source) { |
| 244 | super(source); |
| 245 | values = new HashSet<String>(); |
| 246 | String[] strings = source.readStringArray(); |
| 247 | |
| 248 | final int stringCount = strings.length; |
| 249 | for (int i = 0; i < stringCount; i++) { |
| 250 | values.add(strings[i]); |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | public SavedState(Parcelable superState) { |
| 255 | super(superState); |
| 256 | } |
| 257 | |
| 258 | @Override |
| 259 | public void writeToParcel(Parcel dest, int flags) { |
| 260 | super.writeToParcel(dest, flags); |
| 261 | dest.writeStringArray(values.toArray(new String[0])); |
| 262 | } |
| 263 | |
| 264 | public static final Parcelable.Creator<SavedState> CREATOR = |
| 265 | new Parcelable.Creator<SavedState>() { |
| 266 | public SavedState createFromParcel(Parcel in) { |
| 267 | return new SavedState(in); |
| 268 | } |
| 269 | |
| 270 | public SavedState[] newArray(int size) { |
| 271 | return new SavedState[size]; |
| 272 | } |
| 273 | }; |
| 274 | } |
| 275 | } |