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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 package com.example.android.autofillframework.app
     17 
     18 import android.content.Context
     19 import android.content.Intent
     20 import android.os.Bundle
     21 import android.support.v7.app.AppCompatActivity
     22 import android.util.Log
     23 import android.view.View
     24 import android.view.autofill.AutofillManager
     25 import android.widget.ArrayAdapter
     26 import android.widget.AutoCompleteTextView
     27 import android.widget.Toast
     28 import com.example.android.autofillframework.CommonUtil.TAG
     29 import com.example.android.autofillframework.R
     30 import kotlinx.android.synthetic.main.login_with_autocomplete_activity.clear
     31 import kotlinx.android.synthetic.main.login_with_autocomplete_activity.login
     32 import kotlinx.android.synthetic.main.login_with_autocomplete_activity.passwordField
     33 import kotlinx.android.synthetic.main.login_with_autocomplete_activity.usernameField
     34 
     35 class StandardAutoCompleteSignInActivity : AppCompatActivity() {
     36     private var autofillReceived = false
     37     private lateinit var autofillCallback: AutofillManager.AutofillCallback
     38     private lateinit var autofillManager: AutofillManager
     39 
     40     override fun onCreate(savedInstanceState: Bundle?) {
     41         super.onCreate(savedInstanceState)
     42 
     43         setContentView(R.layout.login_with_autocomplete_activity)
     44 
     45         login.setOnClickListener { submitLogin() }
     46         clear.setOnClickListener { resetFields() }
     47         autofillCallback = MyAutofillCallback()
     48         autofillManager = getSystemService(AutofillManager::class.java)
     49         val mockAutocompleteAdapter = ArrayAdapter.createFromResource(this, R.array.mock_autocomplete_sign_in_suggestions,
     50                 android.R.layout.simple_dropdown_item_1line)
     51         usernameField.setAdapter(mockAutocompleteAdapter)
     52     }
     53 
     54     override fun onResume() {
     55         super.onResume()
     56         autofillManager.registerCallback(autofillCallback)
     57     }
     58 
     59     override fun onPause() {
     60         super.onPause()
     61         autofillManager.unregisterCallback(autofillCallback)
     62     }
     63 
     64     private fun resetFields() {
     65         usernameField.setText("")
     66         passwordField.setText("")
     67     }
     68 
     69     /**
     70      * Emulates a login action.
     71      */
     72     private fun submitLogin() {
     73         val username = usernameField.text.toString()
     74         val password = passwordField.text.toString()
     75         val valid = isValidCredentials(username, password)
     76         if (valid) {
     77             val intent = WelcomeActivity.getStartActivityIntent(this@StandardAutoCompleteSignInActivity)
     78             startActivity(intent)
     79             finish()
     80         } else {
     81             Toast.makeText(this, "Authentication failed.", Toast.LENGTH_SHORT).show()
     82         }
     83     }
     84 
     85     /**
     86      * Dummy implementation for demo purposes. A real service should use secure mechanisms to
     87      * authenticate users.
     88      */
     89     fun isValidCredentials(username: String?, password: String?): Boolean {
     90         return username != null && password != null && username == password
     91     }
     92 
     93     private inner class MyAutofillCallback : AutofillManager.AutofillCallback() {
     94         override fun onAutofillEvent(view: View, event: Int) {
     95             super.onAutofillEvent(view, event)
     96             if (view is AutoCompleteTextView) {
     97                 when (event) {
     98                     AutofillManager.AutofillCallback.EVENT_INPUT_UNAVAILABLE,
     99                     AutofillManager.AutofillCallback.EVENT_INPUT_HIDDEN -> {
    100                         if (!autofillReceived) {
    101                             view.showDropDown()
    102                         }
    103                     }
    104                     AutofillManager.AutofillCallback.EVENT_INPUT_SHOWN -> {
    105                         autofillReceived = true
    106                         view.setAdapter(null)
    107                     }
    108                     else -> Log.d(TAG, "Unexpected callback: " + event)
    109                 }
    110             }
    111         }
    112     }
    113 
    114     companion object {
    115 
    116         fun getStartActivityIntent(context: Context): Intent {
    117             val intent = Intent(context, StandardAutoCompleteSignInActivity::class.java)
    118             return intent
    119         }
    120     }
    121 }