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 android.support.v14.preference; 18 19 import android.app.AlertDialog; 20 import android.content.DialogInterface; 21 import android.os.Bundle; 22 import android.support.v7.preference.ListPreference; 23 24 public class ListPreferenceDialogFragment extends PreferenceDialogFragment { 25 26 private int mClickedDialogEntryIndex; 27 newInstance(String key)28 public static ListPreferenceDialogFragment newInstance(String key) { 29 final ListPreferenceDialogFragment fragment = new ListPreferenceDialogFragment(); 30 final Bundle b = new Bundle(1); 31 b.putString(ARG_KEY, key); 32 fragment.setArguments(b); 33 return fragment; 34 } 35 getListPreference()36 private ListPreference getListPreference() { 37 return (ListPreference) getPreference(); 38 } 39 40 @Override onPrepareDialogBuilder(AlertDialog.Builder builder)41 protected void onPrepareDialogBuilder(AlertDialog.Builder builder) { 42 super.onPrepareDialogBuilder(builder); 43 44 final ListPreference preference = getListPreference(); 45 46 if (preference.getEntries() == null || preference.getEntryValues() == null) { 47 throw new IllegalStateException( 48 "ListPreference requires an entries array and an entryValues array."); 49 } 50 51 mClickedDialogEntryIndex = preference.findIndexOfValue(preference.getValue()); 52 builder.setSingleChoiceItems(preference.getEntries(), mClickedDialogEntryIndex, 53 new DialogInterface.OnClickListener() { 54 public void onClick(DialogInterface dialog, int which) { 55 mClickedDialogEntryIndex = which; 56 57 /* 58 * Clicking on an item simulates the positive button 59 * click, and dismisses the dialog. 60 */ 61 ListPreferenceDialogFragment.this.onClick(dialog, 62 DialogInterface.BUTTON_POSITIVE); 63 dialog.dismiss(); 64 } 65 }); 66 67 /* 68 * The typical interaction for list-based dialogs is to have 69 * click-on-an-item dismiss the dialog instead of the user having to 70 * press 'Ok'. 71 */ 72 builder.setPositiveButton(null, null); 73 } 74 75 @Override onDialogClosed(boolean positiveResult)76 public void onDialogClosed(boolean positiveResult) { 77 final ListPreference preference = getListPreference(); 78 if (positiveResult && mClickedDialogEntryIndex >= 0 && 79 preference.getEntryValues() != null) { 80 String value = preference.getEntryValues()[mClickedDialogEntryIndex].toString(); 81 if (preference.callChangeListener(value)) { 82 preference.setValue(value); 83 } 84 } 85 } 86 87 } 88