1 /* 2 * Copyright (C) 2017 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.settings.widget; 18 19 import android.app.AlertDialog; 20 import android.content.Context; 21 import android.support.annotation.VisibleForTesting; 22 import android.text.Editable; 23 import android.text.InputType; 24 import android.text.TextUtils; 25 import android.text.TextWatcher; 26 import android.util.AttributeSet; 27 import android.util.Log; 28 import android.view.View; 29 import android.widget.EditText; 30 31 import com.android.settingslib.CustomEditTextPreference; 32 33 /** 34 * {@code EditTextPreference} that supports input validation. 35 */ 36 public class ValidatedEditTextPreference extends CustomEditTextPreference { 37 38 public interface Validator { isTextValid(String value)39 boolean isTextValid(String value); 40 } 41 42 private final EditTextWatcher mTextWatcher = new EditTextWatcher(); 43 private Validator mValidator; 44 private boolean mIsPassword; 45 ValidatedEditTextPreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)46 public ValidatedEditTextPreference(Context context, AttributeSet attrs, 47 int defStyleAttr, int defStyleRes) { 48 super(context, attrs, defStyleAttr, defStyleRes); 49 } 50 ValidatedEditTextPreference(Context context, AttributeSet attrs, int defStyleAttr)51 public ValidatedEditTextPreference(Context context, AttributeSet attrs, int defStyleAttr) { 52 super(context, attrs, defStyleAttr); 53 } 54 ValidatedEditTextPreference(Context context, AttributeSet attrs)55 public ValidatedEditTextPreference(Context context, AttributeSet attrs) { 56 super(context, attrs); 57 } 58 ValidatedEditTextPreference(Context context)59 public ValidatedEditTextPreference(Context context) { 60 super(context); 61 } 62 63 @Override onBindDialogView(View view)64 protected void onBindDialogView(View view) { 65 super.onBindDialogView(view); 66 final EditText editText = view.findViewById(android.R.id.edit); 67 if (editText != null && !TextUtils.isEmpty(editText.getText())) { 68 editText.setSelection(editText.getText().length()); 69 } 70 if (mValidator != null && editText != null) { 71 editText.removeTextChangedListener(mTextWatcher); 72 if (mIsPassword) { 73 editText.setInputType( 74 InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD); 75 editText.setMaxLines(1); 76 } 77 editText.addTextChangedListener(mTextWatcher); 78 } 79 } 80 setIsPassword(boolean isPassword)81 public void setIsPassword(boolean isPassword) { 82 mIsPassword = isPassword; 83 } 84 85 @VisibleForTesting(otherwise = VisibleForTesting.NONE) isPassword()86 public boolean isPassword() { 87 return mIsPassword; 88 } 89 setValidator(Validator validator)90 public void setValidator(Validator validator) { 91 mValidator = validator; 92 } 93 94 private class EditTextWatcher implements TextWatcher { 95 @Override onTextChanged(CharSequence s, int start, int before, int count)96 public void onTextChanged(CharSequence s, int start, int before, int count) { 97 } 98 99 @Override beforeTextChanged(CharSequence s, int start, int before, int count)100 public void beforeTextChanged(CharSequence s, int start, int before, int count) { 101 } 102 103 @Override afterTextChanged(Editable s)104 public void afterTextChanged(Editable s) { 105 final EditText editText = getEditText(); 106 if (mValidator != null && editText != null) { 107 final AlertDialog dialog = (AlertDialog) getDialog(); 108 final boolean valid = mValidator.isTextValid(editText.getText().toString()); 109 dialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(valid); 110 } 111 } 112 } 113 114 } 115