src/com/android/car/settings/common/PasswordEditTextPreferenceDialogFragment.java

/*
 * Copyright 2019 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.car.settings.common;

import android.os.Bundle;
import android.text.InputType;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;

import com.android.car.settings.R;

/**
 * Extends {@link ValidatedEditTextPreferenceDialogFragment} for entering password input. Obscures
 * password input by default and reveals a checkbox that toggles the password visibility.
 */
public class PasswordEditTextPreferenceDialogFragment extends
        ValidatedEditTextPreferenceDialogFragment {

    private EditText mEditText;

    /**
     * Returns a new instance of {@link PasswordEditTextPreferenceDialogFragment} for the
     * {@link PasswordEditTextPreference} with the given {@code key}.
     */
    public static PasswordEditTextPreferenceDialogFragment newInstance(String key) {
        PasswordEditTextPreferenceDialogFragment fragment =
                new PasswordEditTextPreferenceDialogFragment();
        Bundle b = new Bundle(/* capacity= */ 1);
        b.putString(ARG_KEY, key);
        fragment.setArguments(b);
        return fragment;
    }


    @Override
    protected void onBindDialogView(View view) {
        super.onBindDialogView(view);

        mEditText = view.findViewById(android.R.id.edit);
        mEditText.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
        CheckBox cb = view.findViewById(R.id.checkbox);
        cb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (isChecked) {
                    mEditText.setInputType(InputType.TYPE_CLASS_TEXT
                            | InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
                } else {
                    mEditText.setInputType(InputType.TYPE_CLASS_TEXT
                            | InputType.TYPE_TEXT_VARIATION_PASSWORD);
                }
                // Place cursor at the end
                mEditText.setSelection(mEditText.getText().length());
            }
        });
    }
}