1 /* 2 * Copyright 2019 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.car.settings.common; 18 19 import android.app.AlertDialog; 20 import android.os.Bundle; 21 import android.text.Editable; 22 import android.text.TextWatcher; 23 import android.view.View; 24 import android.widget.EditText; 25 import android.widget.TextView; 26 27 import com.android.car.ui.preference.EditTextPreferenceDialogFragment; 28 29 /** 30 * Adds optional text validation logic to {@link EditTextPreferenceDialogFragment}. Disables 31 * Positive Button and the ability to press Enter to submit the dialog if the input is invalid. 32 * Validator must be provided by {@link ValidatedEditTextPreference} before launching the Dialog 33 * Fragment for it to be attached to its View. 34 */ 35 public class ValidatedEditTextPreferenceDialogFragment extends 36 EditTextPreferenceDialogFragment implements TextView.OnEditorActionListener { 37 38 private final EditTextWatcher mTextWatcher = new EditTextWatcher(); 39 40 private ValidatedEditTextPreference.Validator mValidator; 41 private EditText mEditText; 42 43 /** 44 * Returns a new instance of {@link ValidatedEditTextPreferenceDialogFragment} for the 45 * {@link ValidatedEditTextPreference} with the given {@code key}. 46 */ newInstance(String key)47 public static ValidatedEditTextPreferenceDialogFragment newInstance(String key) { 48 ValidatedEditTextPreferenceDialogFragment fragment = 49 new ValidatedEditTextPreferenceDialogFragment(); 50 Bundle b = new Bundle(/* capacity= */ 1); 51 b.putString(ARG_KEY, key); 52 fragment.setArguments(b); 53 return fragment; 54 } 55 56 @Override onBindDialogView(View view)57 protected void onBindDialogView(View view) { 58 super.onBindDialogView(view); 59 mEditText = view.findViewById(android.R.id.edit); 60 if (getPreference() instanceof ValidatedEditTextPreference) { 61 ValidatedEditTextPreference.Validator validator = 62 ((ValidatedEditTextPreference) getPreference()).getValidator(); 63 if (validator != null) { 64 attachValidatorToView(view, validator); 65 } 66 } 67 68 } 69 70 @Override onStart()71 public void onStart() { 72 super.onStart(); 73 allowDialogSubmissionOnlyIfValidInput((AlertDialog) getDialog()); 74 } 75 attachValidatorToView(View view, ValidatedEditTextPreference.Validator validator)76 private void attachValidatorToView(View view, ValidatedEditTextPreference.Validator validator) { 77 mValidator = validator; 78 EditText editText = view.findViewById(android.R.id.edit); 79 if (mValidator != null && editText != null) { 80 editText.removeTextChangedListener(mTextWatcher); 81 editText.addTextChangedListener(mTextWatcher); 82 } 83 } 84 85 private class EditTextWatcher implements TextWatcher { 86 @Override onTextChanged(CharSequence s, int start, int before, int count)87 public void onTextChanged(CharSequence s, int start, int before, int count) { 88 } 89 90 @Override beforeTextChanged(CharSequence s, int start, int before, int count)91 public void beforeTextChanged(CharSequence s, int start, int before, int count) { 92 } 93 94 @Override afterTextChanged(Editable s)95 public void afterTextChanged(Editable s) { 96 allowDialogSubmissionOnlyIfValidInput((AlertDialog) getDialog()); 97 } 98 } 99 allowDialogSubmissionOnlyIfValidInput(AlertDialog dialog)100 private void allowDialogSubmissionOnlyIfValidInput(AlertDialog dialog) { 101 if (dialog != null && mValidator != null && mEditText != null) { 102 boolean valid = mValidator.isTextValid(mEditText.getText().toString()); 103 dialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(valid); 104 setAllowEnterToSubmit(valid); 105 } 106 } 107 } 108