1 /* 2 * Copyright (C) 2014 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 com.android.fmradio.dialogs; 18 19 import android.app.Activity; 20 import android.app.AlertDialog; 21 import android.app.Dialog; 22 import android.app.DialogFragment; 23 import android.content.DialogInterface; 24 import android.os.Bundle; 25 import android.text.Editable; 26 import android.text.Selection; 27 import android.text.TextUtils; 28 import android.text.TextWatcher; 29 import android.view.View; 30 import android.widget.Button; 31 import android.widget.EditText; 32 33 import com.android.fmradio.R; 34 35 /** 36 * Edit favorite station name and frequency, caller should implement 37 * EditFavoriteListener 38 */ 39 public class FmFavoriteEditDialog extends DialogFragment { 40 private static final String STATION_NAME = "station_name"; 41 private static final String STATION_FREQ = "station_freq"; 42 private EditFavoriteListener mListener = null; 43 private EditText mStationNameEditor = null; 44 45 /** 46 * Create edit favorite dialog instance, caller should implement edit 47 * favorite listener 48 * 49 * @param stationName The station name 50 * @param stationFreq The station frequency 51 * @return edit favorite dialog 52 */ newInstance(String stationName, int stationFreq)53 public static FmFavoriteEditDialog newInstance(String stationName, int stationFreq) { 54 FmFavoriteEditDialog fragment = new FmFavoriteEditDialog(); 55 Bundle args = new Bundle(2); 56 args.putString(STATION_NAME, stationName); 57 args.putInt(STATION_FREQ, stationFreq); 58 fragment.setArguments(args); 59 return fragment; 60 } 61 62 /** 63 * Edit favorite listener 64 */ 65 public interface EditFavoriteListener { 66 /** 67 * Edit favorite station name and station frequency 68 */ editFavorite(int stationFreq, String name)69 void editFavorite(int stationFreq, String name); 70 } 71 72 @Override onAttach(Activity activity)73 public void onAttach(Activity activity) { 74 super.onAttach(activity); 75 try { 76 mListener = (EditFavoriteListener) activity; 77 } catch (ClassCastException e) { 78 e.printStackTrace(); 79 } 80 } 81 82 @Override onCreateDialog(Bundle savedInstanceState)83 public Dialog onCreateDialog(Bundle savedInstanceState) { 84 String stationName = getArguments().getString(STATION_NAME); 85 final int stationFreq = getArguments().getInt(STATION_FREQ); 86 View v = View.inflate(getActivity(), R.layout.editstation, null); 87 mStationNameEditor = (EditText) v.findViewById( 88 R.id.dlg_edit_station_name_text); 89 90 if (null == stationName || "".equals(stationName.trim())) { 91 stationName = ""; 92 } 93 94 mStationNameEditor.requestFocus(); 95 mStationNameEditor.requestFocusFromTouch(); 96 // Edit 97 mStationNameEditor.setText(stationName); 98 Editable text = mStationNameEditor.getText(); 99 Selection.setSelection(text, text.length()); 100 return new AlertDialog.Builder(getActivity()) 101 // Must call setTitle here or the title will not be displayed. 102 .setTitle(getString(R.string.rename)).setView(v) 103 .setPositiveButton(R.string.save, 104 new DialogInterface.OnClickListener() { 105 public void onClick(DialogInterface dialog, int which) { 106 String newName = mStationNameEditor.getText().toString().trim(); 107 mListener.editFavorite(stationFreq, newName); 108 } 109 }) 110 .setNegativeButton(android.R.string.cancel, null) 111 .create(); 112 } 113 114 /** 115 * Set the dialog edit text and other attribute. 116 */ 117 @Override 118 public void onResume() { 119 super.onResume(); 120 setTextChangedCallback(); 121 String toName = mStationNameEditor.getText().toString(); 122 // empty or blank or white space only name is not allowed 123 toggleSaveButton(toName != null && TextUtils.getTrimmedLength(toName) > 0); 124 } 125 126 /** 127 * This method register callback and set filter to Edit, in order to make 128 * sure that user input is legal. The input can't be empty/blank/all-spaces filename 129 */ 130 private void setTextChangedCallback() { 131 mStationNameEditor.addTextChangedListener(new TextWatcher() { 132 // not use, so don't need to implement it 133 @Override 134 public void afterTextChanged(Editable arg0) { 135 } 136 137 // not use, so don't need to implement it 138 @Override 139 public void beforeTextChanged(CharSequence s, int start, int count, int after) { 140 } 141 142 /** 143 * check user input whether is null or all white space. 144 */ 145 @Override 146 public void onTextChanged(CharSequence s, int start, int before, int count) { 147 // empty or blank or white space only name is not allowed 148 toggleSaveButton(TextUtils.getTrimmedLength(s) > 0); 149 } 150 }); 151 } 152 153 /** 154 * This method enables or disables save button to forbid renaming station name to null. 155 * @param isEnabled true to enable save button, false to disable save button 156 */ 157 private void toggleSaveButton(boolean isEnabled) { 158 final AlertDialog dialog = (AlertDialog) getDialog(); 159 if (dialog == null) { 160 return; 161 } 162 final Button button = dialog.getButton(DialogInterface.BUTTON_POSITIVE); 163 button.setEnabled(isEnabled); 164 } 165 } 166