| /* |
| * Copyright 2019 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.car.ui.preference; |
| |
| import android.app.AlertDialog; |
| import android.content.DialogInterface; |
| import android.os.Bundle; |
| |
| import androidx.annotation.NonNull; |
| import androidx.preference.ListPreference; |
| |
| /** |
| * Presents a dialog with a list of options associated with a {@link ListPreference}. |
| * |
| * <p>Note: this is borrowed as-is from androidx.preference.ListPreferenceDialogFragmentCompat |
| * with updates to formatting to match the project style. Automotive applications should use this |
| * implementations in order to launch the system themed platform {@link AlertDialog} instead of the |
| * one in the support library. |
| */ |
| public class ListPreferenceDialogFragment extends PreferenceDialogFragment { |
| |
| private static final String SAVE_STATE_INDEX = "ListPreferenceDialogFragment.index"; |
| private static final String SAVE_STATE_ENTRIES = "ListPreferenceDialogFragment.entries"; |
| private static final String SAVE_STATE_ENTRY_VALUES = |
| "ListPreferenceDialogFragment.entryValues"; |
| |
| private int mClickedDialogEntryIndex; |
| private CharSequence[] mEntries; |
| private CharSequence[] mEntryValues; |
| |
| /** |
| * Returns a new instance of {@link ListPreferenceDialogFragment} for the {@link |
| * ListPreference} with the given {@code key}. |
| */ |
| public static ListPreferenceDialogFragment newInstance(String key) { |
| ListPreferenceDialogFragment fragment = new ListPreferenceDialogFragment(); |
| Bundle b = new Bundle(/* capacity= */ 1); |
| b.putString(ARG_KEY, key); |
| fragment.setArguments(b); |
| return fragment; |
| } |
| |
| @Override |
| public void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| if (savedInstanceState == null) { |
| ListPreference preference = getListPreference(); |
| |
| if (preference.getEntries() == null || preference.getEntryValues() == null) { |
| throw new IllegalStateException( |
| "ListPreference requires an entries array and an entryValues array."); |
| } |
| |
| mClickedDialogEntryIndex = preference.findIndexOfValue(preference.getValue()); |
| mEntries = preference.getEntries(); |
| mEntryValues = preference.getEntryValues(); |
| } else { |
| mClickedDialogEntryIndex = savedInstanceState.getInt(SAVE_STATE_INDEX, 0); |
| mEntries = savedInstanceState.getCharSequenceArray(SAVE_STATE_ENTRIES); |
| mEntryValues = savedInstanceState.getCharSequenceArray(SAVE_STATE_ENTRY_VALUES); |
| } |
| } |
| |
| @Override |
| public void onSaveInstanceState(@NonNull Bundle outState) { |
| super.onSaveInstanceState(outState); |
| outState.putInt(SAVE_STATE_INDEX, mClickedDialogEntryIndex); |
| outState.putCharSequenceArray(SAVE_STATE_ENTRIES, mEntries); |
| outState.putCharSequenceArray(SAVE_STATE_ENTRY_VALUES, mEntryValues); |
| } |
| |
| private ListPreference getListPreference() { |
| return (ListPreference) getPreference(); |
| } |
| |
| @Override |
| protected void onPrepareDialogBuilder(AlertDialog.Builder builder) { |
| super.onPrepareDialogBuilder(builder); |
| |
| builder.setSingleChoiceItems(mEntries, mClickedDialogEntryIndex, |
| (dialog, which) -> { |
| mClickedDialogEntryIndex = which; |
| |
| // Clicking on an item simulates the positive button click, and dismisses the |
| // dialog. |
| ListPreferenceDialogFragment.this.onClick(dialog, |
| DialogInterface.BUTTON_POSITIVE); |
| dialog.dismiss(); |
| }); |
| |
| // The typical interaction for list-based dialogs is to have click-on-an-item dismiss the |
| // dialog instead of the user having to press 'Ok'. |
| builder.setPositiveButton(null, null); |
| } |
| |
| @Override |
| public void onDialogClosed(boolean positiveResult) { |
| if (positiveResult && mClickedDialogEntryIndex >= 0) { |
| String value = mEntryValues[mClickedDialogEntryIndex].toString(); |
| ListPreference preference = getListPreference(); |
| if (preference.callChangeListener(value)) { |
| preference.setValue(value); |
| } |
| } |
| } |
| |
| } |