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      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.support.v7.preference.PreferenceViewHolder;
     23 import android.text.Editable;
     24 import android.text.InputType;
     25 import android.text.TextUtils;
     26 import android.text.TextWatcher;
     27 import android.util.AttributeSet;
     28 import android.util.Log;
     29 import android.view.View;
     30 import android.widget.EditText;
     31 import android.widget.TextView;
     32 
     33 import com.android.settingslib.CustomEditTextPreference;
     34 
     35 /**
     36  * {@code EditTextPreference} that supports input validation.
     37  */
     38 public class ValidatedEditTextPreference extends CustomEditTextPreference {
     39 
     40     public interface Validator {
     41         boolean isTextValid(String value);
     42     }
     43 
     44     private final EditTextWatcher mTextWatcher = new EditTextWatcher();
     45     private Validator mValidator;
     46     private boolean mIsPassword;
     47     private boolean mIsSummaryPassword;
     48 
     49     public ValidatedEditTextPreference(Context context, AttributeSet attrs,
     50             int defStyleAttr, int defStyleRes) {
     51         super(context, attrs, defStyleAttr, defStyleRes);
     52     }
     53 
     54     public ValidatedEditTextPreference(Context context, AttributeSet attrs, int defStyleAttr) {
     55         super(context, attrs, defStyleAttr);
     56     }
     57 
     58     public ValidatedEditTextPreference(Context context, AttributeSet attrs) {
     59         super(context, attrs);
     60     }
     61 
     62     public ValidatedEditTextPreference(Context context) {
     63         super(context);
     64     }
     65 
     66     @Override
     67     protected void onBindDialogView(View view) {
     68         super.onBindDialogView(view);
     69         final EditText editText = view.findViewById(android.R.id.edit);
     70         if (editText != null && !TextUtils.isEmpty(editText.getText())) {
     71             editText.setSelection(editText.getText().length());
     72         }
     73         if (mValidator != null && editText != null) {
     74             editText.removeTextChangedListener(mTextWatcher);
     75             if (mIsPassword) {
     76                 editText.setInputType(
     77                         InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
     78                 editText.setMaxLines(1);
     79             }
     80             editText.addTextChangedListener(mTextWatcher);
     81         }
     82     }
     83 
     84     @Override
     85     public void onBindViewHolder(PreferenceViewHolder holder) {
     86         super.onBindViewHolder(holder);
     87 
     88         final TextView textView = (TextView) holder.findViewById(android.R.id.summary);
     89         if (textView == null) {
     90             return;
     91         }
     92         if (mIsSummaryPassword) {
     93             textView.setInputType(
     94                     InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
     95         } else {
     96             textView.setInputType(InputType.TYPE_CLASS_TEXT);
     97         }
     98     }
     99 
    100     public void setIsPassword(boolean isPassword) {
    101         mIsPassword = isPassword;
    102     }
    103 
    104     public void setIsSummaryPassword(boolean isPassword) {
    105         mIsSummaryPassword = isPassword;
    106     }
    107 
    108     @VisibleForTesting(otherwise = VisibleForTesting.NONE)
    109     public boolean isPassword() {
    110         return mIsPassword;
    111     }
    112 
    113     public void setValidator(Validator validator) {
    114         mValidator = validator;
    115     }
    116 
    117     private class EditTextWatcher implements TextWatcher {
    118         @Override
    119         public void onTextChanged(CharSequence s, int start, int before, int count) {
    120         }
    121 
    122         @Override
    123         public void beforeTextChanged(CharSequence s, int start, int before, int count) {
    124         }
    125 
    126         @Override
    127         public void afterTextChanged(Editable s) {
    128             final EditText editText = getEditText();
    129             if (mValidator != null && editText != null) {
    130                 final AlertDialog dialog = (AlertDialog) getDialog();
    131                 final boolean valid = mValidator.isTextValid(editText.getText().toString());
    132                 dialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(valid);
    133             }
    134         }
    135     }
    136 
    137 }
    138