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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.autofill.app.commoncases;
     17 
     18 import android.content.Context;
     19 import android.content.Intent;
     20 import android.os.Bundle;
     21 import android.support.annotation.NonNull;
     22 import android.support.v7.app.AppCompatActivity;
     23 import android.util.Log;
     24 import android.view.View;
     25 import android.view.autofill.AutofillManager;
     26 import android.widget.ArrayAdapter;
     27 import android.widget.AutoCompleteTextView;
     28 import android.widget.TextView;
     29 import android.widget.Toast;
     30 
     31 import com.example.android.autofill.app.R;
     32 import com.example.android.autofill.app.WelcomeActivity;
     33 
     34 import static com.example.android.autofill.app.Util.TAG;
     35 
     36 public class StandardAutoCompleteSignInActivity extends AppCompatActivity {
     37     private AutoCompleteTextView mUsernameAutoCompleteField;
     38     private TextView mPasswordField;
     39     private TextView mLoginButton;
     40     private TextView mClearButton;
     41     private boolean mAutofillReceived = false;
     42     private AutofillManager.AutofillCallback mAutofillCallback;
     43     private AutofillManager mAutofillManager;
     44 
     45     @Override
     46     protected void onCreate(Bundle savedInstanceState) {
     47         super.onCreate(savedInstanceState);
     48 
     49         setContentView(R.layout.login_with_autocomplete_activity);
     50 
     51         mLoginButton = findViewById(R.id.login);
     52         mClearButton = findViewById(R.id.clear);
     53         mUsernameAutoCompleteField = findViewById(R.id.usernameField);
     54         mPasswordField = findViewById(R.id.passwordField);
     55         mLoginButton.setOnClickListener(new View.OnClickListener() {
     56             @Override
     57             public void onClick(View v) {
     58                 login();
     59             }
     60         });
     61         mClearButton.setOnClickListener(new View.OnClickListener() {
     62             @Override
     63             public void onClick(View v) {
     64                 AutofillManager afm = getSystemService(AutofillManager.class);
     65                 if (afm != null) {
     66                     afm.cancel();
     67                 }
     68                 resetFields();
     69             }
     70         });
     71         mAutofillCallback = new MyAutofillCallback();
     72         mAutofillManager = getSystemService(AutofillManager.class);
     73         ArrayAdapter<CharSequence> mockAutocompleteAdapter = ArrayAdapter.createFromResource
     74                 (this, R.array.mock_autocomplete_sign_in_suggestions,
     75                         android.R.layout.simple_dropdown_item_1line);
     76         mUsernameAutoCompleteField.setAdapter(mockAutocompleteAdapter);
     77     }
     78 
     79     @Override
     80     protected void onResume() {
     81         super.onResume();
     82         mAutofillManager.registerCallback(mAutofillCallback);
     83     }
     84 
     85     @Override
     86     protected void onPause() {
     87         super.onPause();
     88         mAutofillManager.unregisterCallback(mAutofillCallback);
     89     }
     90 
     91     private void resetFields() {
     92         mUsernameAutoCompleteField.setText("");
     93         mPasswordField.setText("");
     94     }
     95 
     96     /**
     97      * Emulates a login action.
     98      */
     99     private void login() {
    100         String username = mUsernameAutoCompleteField.getText().toString();
    101         String password = mPasswordField.getText().toString();
    102         boolean valid = isValidCredentials(username, password);
    103         if (valid) {
    104             Intent intent = WelcomeActivity.getStartActivityIntent(StandardAutoCompleteSignInActivity.this);
    105             startActivity(intent);
    106             finish();
    107         } else {
    108             Toast.makeText(this, "Authentication failed.", Toast.LENGTH_SHORT).show();
    109         }
    110     }
    111 
    112     /**
    113      * Dummy implementation for demo purposes. A real service should use secure mechanisms to
    114      * authenticate users.
    115      */
    116     public boolean isValidCredentials(String username, String password) {
    117         return username != null && password != null && username.equals(password);
    118     }
    119 
    120     private class MyAutofillCallback extends AutofillManager.AutofillCallback {
    121         @Override
    122         public void onAutofillEvent(@NonNull View view, int event) {
    123             if (view instanceof AutoCompleteTextView) {
    124                 switch (event) {
    125                     case AutofillManager.AutofillCallback.EVENT_INPUT_UNAVAILABLE:
    126                         // no break on purpose
    127                     case AutofillManager.AutofillCallback.EVENT_INPUT_HIDDEN:
    128                         if (!mAutofillReceived) {
    129                             ((AutoCompleteTextView) view).showDropDown();
    130                         }
    131                         break;
    132                     case AutofillManager.AutofillCallback.EVENT_INPUT_SHOWN:
    133                         mAutofillReceived = true;
    134                         ((AutoCompleteTextView) view).setAdapter(null);
    135                         break;
    136                     default:
    137                         Log.d(TAG, "Unexpected callback: " + event);
    138                 }
    139             }
    140         }
    141     }
    142 }