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.os.Bundle; 20 import android.text.TextUtils; 21 import android.view.LayoutInflater; 22 import android.view.View; 23 import android.view.ViewGroup; 24 import android.widget.Checkable; 25 import android.widget.TextView; 26 27 import androidx.annotation.NonNull; 28 import androidx.annotation.Nullable; 29 import androidx.collection.ArraySet; 30 import androidx.leanback.widget.VerticalGridView; 31 import androidx.preference.DialogPreference; 32 import androidx.preference.ListPreference; 33 import androidx.preference.MultiSelectListPreference; 34 import androidx.recyclerview.widget.RecyclerView; 35 36 import java.util.Collections; 37 import java.util.HashSet; 38 import java.util.Set; 39 40 public class LeanbackListPreferenceDialogFragment extends LeanbackPreferenceDialogFragment { 41 42 private static final String SAVE_STATE_IS_MULTI = 43 "LeanbackListPreferenceDialogFragment.isMulti"; 44 private static final String SAVE_STATE_ENTRIES = "LeanbackListPreferenceDialogFragment.entries"; 45 private static final String SAVE_STATE_ENTRY_VALUES = 46 "LeanbackListPreferenceDialogFragment.entryValues"; 47 private static final String SAVE_STATE_TITLE = "LeanbackListPreferenceDialogFragment.title"; 48 private static final String SAVE_STATE_MESSAGE = "LeanbackListPreferenceDialogFragment.message"; 49 private static final String SAVE_STATE_INITIAL_SELECTIONS = 50 "LeanbackListPreferenceDialogFragment.initialSelections"; 51 private static final String SAVE_STATE_INITIAL_SELECTION = 52 "LeanbackListPreferenceDialogFragment.initialSelection"; 53 54 private boolean mMulti; 55 private CharSequence[] mEntries; 56 private CharSequence[] mEntryValues; 57 private CharSequence mDialogTitle; 58 private CharSequence mDialogMessage; 59 private Set<String> mInitialSelections; 60 private String mInitialSelection; 61 62 public static LeanbackListPreferenceDialogFragment newInstanceSingle(String key) { 63 final Bundle args = new Bundle(1); 64 args.putString(ARG_KEY, key); 65 66 final LeanbackListPreferenceDialogFragment 67 fragment = new LeanbackListPreferenceDialogFragment(); 68 fragment.setArguments(args); 69 70 return fragment; 71 } 72 73 public static LeanbackListPreferenceDialogFragment newInstanceMulti(String key) { 74 final Bundle args = new Bundle(1); 75 args.putString(ARG_KEY, key); 76 77 final LeanbackListPreferenceDialogFragment 78 fragment = new LeanbackListPreferenceDialogFragment(); 79 fragment.setArguments(args); 80 81 return fragment; 82 } 83 84 @Override 85 public void onCreate(Bundle savedInstanceState) { 86 super.onCreate(savedInstanceState); 87 88 if (savedInstanceState == null) { 89 final DialogPreference preference = getPreference(); 90 mDialogTitle = preference.getDialogTitle(); 91 mDialogMessage = preference.getDialogMessage(); 92 93 if (preference instanceof ListPreference) { 94 mMulti = false; 95 mEntries = ((ListPreference) preference).getEntries(); 96 mEntryValues = ((ListPreference) preference).getEntryValues(); 97 mInitialSelection = ((ListPreference) preference).getValue(); 98 } else if (preference instanceof MultiSelectListPreference) { 99 mMulti = true; 100 mEntries = ((MultiSelectListPreference) preference).getEntries(); 101 mEntryValues = ((MultiSelectListPreference) preference).getEntryValues(); 102 mInitialSelections = ((MultiSelectListPreference) preference).getValues(); 103 } else { 104 throw new IllegalArgumentException("Preference must be a ListPreference or " 105 + "MultiSelectListPreference"); 106 } 107 } else { 108 mDialogTitle = savedInstanceState.getCharSequence(SAVE_STATE_TITLE); 109 mDialogMessage = savedInstanceState.getCharSequence(SAVE_STATE_MESSAGE); 110 mMulti = savedInstanceState.getBoolean(SAVE_STATE_IS_MULTI); 111 mEntries = savedInstanceState.getCharSequenceArray(SAVE_STATE_ENTRIES); 112 mEntryValues = savedInstanceState.getCharSequenceArray(SAVE_STATE_ENTRY_VALUES); 113 if (mMulti) { 114 final String[] initialSelections = savedInstanceState.getStringArray( 115 SAVE_STATE_INITIAL_SELECTIONS); 116 mInitialSelections = new ArraySet<>( 117 initialSelections != null ? initialSelections.length : 0); 118 if (initialSelections != null) { 119 Collections.addAll(mInitialSelections, initialSelections); 120 } 121 } else { 122 mInitialSelection = savedInstanceState.getString(SAVE_STATE_INITIAL_SELECTION); 123 } 124 } 125 } 126 127 @Override 128 public void onSaveInstanceState(Bundle outState) { 129 super.onSaveInstanceState(outState); 130 outState.putCharSequence(SAVE_STATE_TITLE, mDialogTitle); 131 outState.putCharSequence(SAVE_STATE_MESSAGE, mDialogMessage); 132 outState.putBoolean(SAVE_STATE_IS_MULTI, mMulti); 133 outState.putCharSequenceArray(SAVE_STATE_ENTRIES, mEntries); 134 outState.putCharSequenceArray(SAVE_STATE_ENTRY_VALUES, mEntryValues); 135 if (mMulti) { 136 outState.putStringArray(SAVE_STATE_INITIAL_SELECTIONS, 137 mInitialSelections.toArray(new String[mInitialSelections.size()])); 138 } else { 139 outState.putString(SAVE_STATE_INITIAL_SELECTION, mInitialSelection); 140 } 141 } 142 143 @Override 144 public @Nullable View onCreateView(LayoutInflater inflater, ViewGroup container, 145 Bundle savedInstanceState) { 146 final View view = inflater.inflate(R.layout.leanback_list_preference_fragment, container, 147 false); 148 final VerticalGridView verticalGridView = 149 (VerticalGridView) view.findViewById(android.R.id.list); 150 151 verticalGridView.setWindowAlignment(VerticalGridView.WINDOW_ALIGN_BOTH_EDGE); 152 verticalGridView.setFocusScrollStrategy(VerticalGridView.FOCUS_SCROLL_ALIGNED); 153 verticalGridView.setAdapter(onCreateAdapter()); 154 verticalGridView.requestFocus(); 155 156 final CharSequence title = mDialogTitle; 157 if (!TextUtils.isEmpty(title)) { 158 final TextView titleView = (TextView) view.findViewById(R.id.decor_title); 159 titleView.setText(title); 160 } 161 162 final CharSequence message = mDialogMessage; 163 if (!TextUtils.isEmpty(message)) { 164 final TextView messageView = (TextView) view.findViewById(android.R.id.message); 165 messageView.setVisibility(View.VISIBLE); 166 messageView.setText(message); 167 } 168 169 return view; 170 } 171 172 public RecyclerView.Adapter onCreateAdapter() { 173 //final DialogPreference preference = getPreference(); 174 if (mMulti) { 175 return new AdapterMulti(mEntries, mEntryValues, mInitialSelections); 176 } else { 177 return new AdapterSingle(mEntries, mEntryValues, mInitialSelection); 178 } 179 } 180 181 public class AdapterSingle extends RecyclerView.Adapter<ViewHolder> 182 implements ViewHolder.OnItemClickListener { 183 184 private final CharSequence[] mEntries; 185 private final CharSequence[] mEntryValues; 186 private CharSequence mSelectedValue; 187 188 public AdapterSingle(CharSequence[] entries, CharSequence[] entryValues, 189 CharSequence selectedValue) { 190 mEntries = entries; 191 mEntryValues = entryValues; 192 mSelectedValue = selectedValue; 193 } 194 195 @Override 196 public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 197 final LayoutInflater inflater = LayoutInflater.from(parent.getContext()); 198 final View view = inflater.inflate(R.layout.leanback_list_preference_item_single, 199 parent, false); 200 return new ViewHolder(view, this); 201 } 202 203 @Override 204 public void onBindViewHolder(ViewHolder holder, int position) { 205 holder.getWidgetView().setChecked(mEntryValues[position].equals(mSelectedValue)); 206 holder.getTitleView().setText(mEntries[position]); 207 } 208 209 @Override 210 public int getItemCount() { 211 return mEntries.length; 212 } 213 214 @Override 215 public void onItemClick(ViewHolder viewHolder) { 216 final int index = viewHolder.getAdapterPosition(); 217 if (index == RecyclerView.NO_POSITION) { 218 return; 219 } 220 final CharSequence entry = mEntryValues[index]; 221 final ListPreference preference = (ListPreference) getPreference(); 222 if (index >= 0) { 223 String value = mEntryValues[index].toString(); 224 if (preference.callChangeListener(value)) { 225 preference.setValue(value); 226 mSelectedValue = entry; 227 } 228 } 229 230 getFragmentManager().popBackStack(); 231 notifyDataSetChanged(); 232 } 233 } 234 235 public class AdapterMulti extends RecyclerView.Adapter<ViewHolder> 236 implements ViewHolder.OnItemClickListener { 237 238 private final CharSequence[] mEntries; 239 private final CharSequence[] mEntryValues; 240 private final Set<String> mSelections; 241 242 public AdapterMulti(CharSequence[] entries, CharSequence[] entryValues, 243 Set<String> initialSelections) { 244 mEntries = entries; 245 mEntryValues = entryValues; 246 mSelections = new HashSet<>(initialSelections); 247 } 248 249 @Override 250 public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 251 final LayoutInflater inflater = LayoutInflater.from(parent.getContext()); 252 final View view = inflater.inflate(R.layout.leanback_list_preference_item_multi, parent, 253 false); 254 return new ViewHolder(view, this); 255 } 256 257 @Override 258 public void onBindViewHolder(ViewHolder holder, int position) { 259 holder.getWidgetView().setChecked( 260 mSelections.contains(mEntryValues[position].toString())); 261 holder.getTitleView().setText(mEntries[position]); 262 } 263 264 @Override 265 public int getItemCount() { 266 return mEntries.length; 267 } 268 269 @Override 270 public void onItemClick(ViewHolder viewHolder) { 271 final int index = viewHolder.getAdapterPosition(); 272 if (index == RecyclerView.NO_POSITION) { 273 return; 274 } 275 final String entry = mEntryValues[index].toString(); 276 if (mSelections.contains(entry)) { 277 mSelections.remove(entry); 278 } else { 279 mSelections.add(entry); 280 } 281 final MultiSelectListPreference multiSelectListPreference 282 = (MultiSelectListPreference) getPreference(); 283 // Pass copies of the set to callChangeListener and setValues to avoid mutations 284 if (multiSelectListPreference.callChangeListener(new HashSet<>(mSelections))) { 285 multiSelectListPreference.setValues(new HashSet<>(mSelections)); 286 mInitialSelections = mSelections; 287 } else { 288 // Change refused, back it out 289 if (mSelections.contains(entry)) { 290 mSelections.remove(entry); 291 } else { 292 mSelections.add(entry); 293 } 294 } 295 296 notifyDataSetChanged(); 297 } 298 } 299 300 public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener { 301 302 public interface OnItemClickListener { 303 void onItemClick(ViewHolder viewHolder); 304 } 305 306 private final Checkable mWidgetView; 307 private final TextView mTitleView; 308 private final ViewGroup mContainer; 309 private final OnItemClickListener mListener; 310 311 public ViewHolder(@NonNull View view, @NonNull OnItemClickListener listener) { 312 super(view); 313 mWidgetView = (Checkable) view.findViewById(R.id.button); 314 mContainer = (ViewGroup) view.findViewById(R.id.container); 315 mTitleView = (TextView) view.findViewById(android.R.id.title); 316 mContainer.setOnClickListener(this); 317 mListener = listener; 318 } 319 320 public Checkable getWidgetView() { 321 return mWidgetView; 322 } 323 324 public TextView getTitleView() { 325 return mTitleView; 326 } 327 328 public ViewGroup getContainer() { 329 return mContainer; 330 } 331 332 @Override 333 public void onClick(View v) { 334 mListener.onItemClick(this); 335 } 336 } 337 } 338
