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