Home | History | Annotate | Download | only in bluetooth 
      1 /*
      2  * Copyright (C) 2016 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.bluetooth;
     18 
     19 import android.annotation.Nullable;
     20 import android.app.Activity;
     21 import android.bluetooth.BluetoothDevice;
     22 import android.content.BroadcastReceiver;
     23 import android.content.Context;
     24 import android.content.Intent;
     25 import android.content.IntentFilter;
     26 import android.os.Bundle;
     27 import android.support.annotation.VisibleForTesting;
     28 
     29 /**
     30  * BluetoothPairingDialog asks the user to enter a PIN / Passkey / simple confirmation
     31  * for pairing with a remote Bluetooth device. It is an activity that appears as a dialog.
     32  */
     33 public class BluetoothPairingDialog extends Activity {
     34     public static final String FRAGMENT_TAG = "bluetooth.pairing.fragment";
     35 
     36     private BluetoothPairingController mBluetoothPairingController;
     37     private boolean mReceiverRegistered = false;
     38 
     39     /**
     40      * Dismiss the dialog if the bond state changes to bonded or none,
     41      * or if pairing was canceled for {@link BluetoothPairingController#mDevice}.
     42      */
     43     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
     44         @Override
     45         public void onReceive(Context context, Intent intent) {
     46             String action = intent.getAction();
     47             if (BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action)) {
     48                 int bondState = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE,
     49                         BluetoothDevice.ERROR);
     50                 if (bondState == BluetoothDevice.BOND_BONDED ||
     51                         bondState == BluetoothDevice.BOND_NONE) {
     52                     dismiss();
     53                 }
     54             } else if (BluetoothDevice.ACTION_PAIRING_CANCEL.equals(action)) {
     55                 BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
     56                 if (device == null || mBluetoothPairingController.deviceEquals(device)) {
     57                     dismiss();
     58                 }
     59             }
     60         }
     61     };
     62 
     63     @Override
     64     protected void onCreate(@Nullable Bundle savedInstanceState) {
     65         super.onCreate(savedInstanceState);
     66         Intent intent = getIntent();
     67         mBluetoothPairingController = new BluetoothPairingController(intent, this);
     68         // build the dialog fragment
     69         boolean fragmentFound = true;
     70         // check if the fragment has been preloaded
     71         BluetoothPairingDialogFragment bluetoothFragment =
     72             (BluetoothPairingDialogFragment) getFragmentManager().findFragmentByTag(FRAGMENT_TAG);
     73         // dismiss the fragment if it is already used
     74         if (bluetoothFragment != null && (bluetoothFragment.isPairingControllerSet()
     75             || bluetoothFragment.isPairingDialogActivitySet())) {
     76             bluetoothFragment.dismiss();
     77             bluetoothFragment = null;
     78         }
     79         // build a new fragment if it is null
     80         if (bluetoothFragment == null) {
     81             fragmentFound = false;
     82             bluetoothFragment = new BluetoothPairingDialogFragment();
     83         }
     84         bluetoothFragment.setPairingController(mBluetoothPairingController);
     85         bluetoothFragment.setPairingDialogActivity(this);
     86         // pass the fragment to the manager when it is created from scratch
     87         if (!fragmentFound) {
     88             bluetoothFragment.show(getFragmentManager(), FRAGMENT_TAG);
     89         }
     90         /*
     91          * Leave this registered through pause/resume since we still want to
     92          * finish the activity in the background if pairing is canceled.
     93          */
     94         registerReceiver(mReceiver, new IntentFilter(BluetoothDevice.ACTION_PAIRING_CANCEL));
     95         registerReceiver(mReceiver, new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED));
     96         mReceiverRegistered = true;
     97     }
     98 
     99     @Override
    100     protected void onDestroy() {
    101         super.onDestroy();
    102         if (mReceiverRegistered) {
    103             mReceiverRegistered = false;
    104             unregisterReceiver(mReceiver);
    105         }
    106     }
    107 
    108     @VisibleForTesting
    109     void dismiss() {
    110         if (!isFinishing()) {
    111             finish();
    112         }
    113     }
    114 }
    115