diff options
Diffstat (limited to 'SetupWizard/src/com/android/car/setupwizard/bluetooth/BluetoothActivity.java')
| -rw-r--r-- | SetupWizard/src/com/android/car/setupwizard/bluetooth/BluetoothActivity.java | 427 |
1 files changed, 427 insertions, 0 deletions
diff --git a/SetupWizard/src/com/android/car/setupwizard/bluetooth/BluetoothActivity.java b/SetupWizard/src/com/android/car/setupwizard/bluetooth/BluetoothActivity.java new file mode 100644 index 0000000..734e1ee --- /dev/null +++ b/SetupWizard/src/com/android/car/setupwizard/bluetooth/BluetoothActivity.java @@ -0,0 +1,427 @@ +/* + * Copyright (C) 2017 Google Inc. + * + * 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.setupwizard.bluetooth; + +import static com.android.setupwizardlib.util.ResultCodes.RESULT_SKIP; + +import android.app.Activity; +import android.bluetooth.BluetoothAdapter; +import android.bluetooth.BluetoothDevice; +import android.content.BroadcastReceiver; +import android.content.Context; +import android.content.Intent; +import android.content.IntentFilter; +import android.os.Bundle; +import android.os.Handler; +import android.util.Log; +import android.view.View; + +import com.android.car.setupwizard.R; +import com.android.car.setupwizard.bluetooth.BluetoothDeviceHierarchy.BluetoothItem; + +import com.android.setupwizardlib.GlifRecyclerLayout; +import com.android.setupwizardlib.items.IItem; +import com.android.setupwizardlib.items.Item; +import com.android.setupwizardlib.items.ItemGroup; +import com.android.setupwizardlib.items.RecyclerItemAdapter; +import com.android.setupwizardlib.util.ResultCodes; +import com.android.setupwizardlib.util.WizardManagerHelper; + +/** + * An Activity that presents the option for the user to pair the current device to a nearby + * bluetooth device. This screen will list the devices in the order that they are discovered + * as well as an option to not pair at all. + */ +public class BluetoothActivity extends Activity + implements RecyclerItemAdapter.OnItemSelectedListener { + private static final String TAG = "BluetoothActivity"; + + /** + * This value is copied from {@code com.google.android.setupwizard.BaseActivity}. Wizard + * Manager does not actually return an activity result, but if we invoke Wizard Manager without + * requesting a result, the framework will choose not to issue a call to onActivityResult with + * RESULT_CANCELED when navigating backward. + */ + private static final int REQUEST_CODE_NEXT = 10000; + + private static final int BLUETOOTH_SCAN_RETRY_DELAY = 1000; + private static final int MAX_BLUETOOTH_SCAN_RETRIES = 3; + + private final Handler mHandler = new Handler(); + private int mScanRetryCount; + + private BluetoothScanReceiver mScanReceiver; + private BluetoothAdapterReceiver mAdapterReceiver; + private BluetoothAdapter mAdapter; + private BluetoothDeviceHierarchy mBluetoothDeviceHierarchy; + + private GlifRecyclerLayout mLayout; + private Item mScanningIndicator; + private Item mRescanIndicator; + + /** + * The current {@link BluetoothDevice} that is being paired to. + */ + private BluetoothDevice mCurrentBondingDevice; + + @Override + protected void onCreate(Bundle savedInstanceState) { + super.onCreate(savedInstanceState); + + mAdapter = BluetoothAdapter.getDefaultAdapter(); + + if (mAdapter == null) { + Log.w(TAG, "No bluetooth adapter found on the device. Skipping to next action."); + nextAction(RESULT_SKIP); + return; + } + + setContentView(R.layout.bluetooth_activity); + + mLayout = (GlifRecyclerLayout) findViewById(R.id.setup_wizard_layout); + + RecyclerItemAdapter adapter = (RecyclerItemAdapter) mLayout.getAdapter(); + adapter.setOnItemSelectedListener(this); + + ItemGroup hierarchy = (ItemGroup) adapter.getRootItemHierarchy(); + mBluetoothDeviceHierarchy = + (BluetoothDeviceHierarchy) hierarchy.findItemById(R.id.bluetooth_device_list); + mScanningIndicator = (Item) hierarchy.findItemById(R.id.bluetooth_scanning); + mRescanIndicator = (Item) hierarchy.findItemById(R.id.bluetooth_rescan); + + Item descriptionItem = (Item) hierarchy.findItemById(R.id.bluetooth_description); + descriptionItem.setTitle(getText(R.string.bluetooth_description)); + + // Assume that a search will be started, so display the progress bar to let the user + // know that something is going on. + mLayout.setProgressBarShown(true); + + if (mAdapter.isEnabled()) { + setUpAndStartScan(); + } else { + mAdapterReceiver = new BluetoothAdapterReceiver(); + maybeRegisterAdapterReceiver(); + mAdapter.enable(); + } + } + + @Override + protected void onStart() { + super.onStart(); + + if (Log.isLoggable(TAG, Log.DEBUG)) { + Log.d(TAG, "onStart()"); + } + + if (mAdapter == null) { + Log.w(TAG, "No bluetooth adapter found on the device. Skipping to next action."); + nextAction(RESULT_SKIP); + return; + } + + maybeRegisterAdapterReceiver(); + registerScanReceiver(); + } + + @Override + protected void onStop() { + if (Log.isLoggable(TAG, Log.DEBUG)) { + Log.d(TAG, "onStop()"); + } + + stopScanning(); + + if (mScanReceiver != null) { + unregisterReceiver(mScanReceiver); + } + + if (mAdapterReceiver != null) { + unregisterReceiver(mAdapterReceiver); + } + + super.onStop(); + } + + /** + * Sets up an Intent filter to listen for bluetooth state changes and initiates a scan for + * nearby bluetooth devices. + */ + private void setUpAndStartScan() { + mBluetoothDeviceHierarchy.clearAllDevices(); + registerScanReceiver(); + startScanning(); + } + + /** + * Registers a receiver to be listen on changes to the {@link BluetoothAdapter}. This method + * will only register the receiver if {@link #mAdapterReceiver} is not {@code null}. + */ + private void maybeRegisterAdapterReceiver() { + if (mAdapterReceiver == null) { + return; + } + + IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED); + registerReceiver(mAdapterReceiver, filter); + } + + /** + * Registers an Intent filter to listen for the results of a bluetooth discovery scan as well as + * changes to individual bluetooth devices. + */ + private void registerScanReceiver() { + if (mScanReceiver == null) { + mScanReceiver = new BluetoothScanReceiver(); + } + + IntentFilter intentFilter = new IntentFilter(); + intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED); + intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); + intentFilter.addAction(BluetoothDevice.ACTION_FOUND); + intentFilter.addAction(BluetoothDevice.ACTION_NAME_CHANGED); + intentFilter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED); + registerReceiver(mScanReceiver, intentFilter); + } + + /** + * Start a scan for nearby bluetooth devices. If the call to + * {@link BluetoothAdapter#startDiscovery()} fails, then this method will retry the call after + * an exponential backoff period based on {@link #BLUETOOTH_SCAN_RETRY_DELAY}. + * + * <p>If there is already a bluetooth scan in progress when this function is called, then this + * function will do nothing. + */ + private void startScanning() { + if (mAdapter.isDiscovering()) { + return; + } + + boolean success = mAdapter.startDiscovery(); + + if (Log.isLoggable(TAG, Log.DEBUG)) { + Log.d(TAG, "startDiscovery() success: " + success); + } + + // If a scan fails, attempt to try again up to MAX_BLUETOOTH_SCAN_RETRIES tries. + if (success) { + mScanRetryCount = 0; + } else if (mScanRetryCount >= MAX_BLUETOOTH_SCAN_RETRIES) { + if (Log.isLoggable(TAG, Log.DEBUG)) { + Log.d(TAG, "Reached max retries to initiate a bluetooth scan. Moving onto next " + + "action"); + } + + nextAction(RESULT_SKIP); + } else { + mHandler.postDelayed(this::startScanning, + BLUETOOTH_SCAN_RETRY_DELAY * ++mScanRetryCount); + } + } + + /** + * Stops any scan in that is currently in progress for nearby bluetooth devices. + */ + private void stopScanning() { + if (mAdapter != null && mAdapter.isDiscovering()) { + mAdapter.cancelDiscovery(); + } + + mScanRetryCount = 0; + } + + @Override + public void onItemSelected(IItem item) { + if (item instanceof BluetoothItem) { + pairOrUnpairDevice((BluetoothItem) item); + return; + } + + if (!(item instanceof Item)) { + return; + } + + switch (((Item) item).getId()) { + case R.id.bluetooth_dont_connect: + nextAction(RESULT_SKIP); + break; + + case R.id.bluetooth_rescan: + stopScanning(); + startScanning(); + break; + + default: + Log.w(TAG, "Unknown item clicked: " + item); + } + } + + /** + * Starts a pairing or unpairing session with the given device based on its current bonded + * state. For example, if the current item is already paired, it is unpaired and vice versa. + */ + private void pairOrUnpairDevice(BluetoothItem item) { + // Pairing is unreliable while scanning, so cancel discovery. + stopScanning(); + + BluetoothDevice device = item.getBluetoothDevice(); + + boolean success; + switch (device.getBondState()) { + case BluetoothDevice.BOND_BONDED: + mCurrentBondingDevice = null; + success = device.removeBond(); + + if (Log.isLoggable(TAG, Log.DEBUG)) { + Log.d(TAG, "removeBond() to device (" + device + ") successful: " + success); + } + + // Immediately update the UI so that the user has feedback on their actions. + item.updateConnectionState(this /* context */, + BluetoothItem.CONNECTION_STATE_DISCONNECTING); + break; + + case BluetoothDevice.BOND_BONDING: + mCurrentBondingDevice = null; + success = device.cancelBondProcess(); + + if (Log.isLoggable(TAG, Log.DEBUG)) { + Log.d(TAG, "cancelBondProcess() to device (" + device + ") successful: " + + success); + } + + // Immediately update the UI so that the user has feedback on their actions. + item.updateConnectionState(this /* context */, + BluetoothItem.CONNECTION_STATE_CANCELLING); + break; + + case BluetoothDevice.BOND_NONE: + mCurrentBondingDevice = device; + success = device.createBond(); + + if (Log.isLoggable(TAG, Log.DEBUG)) { + Log.d(TAG, "createBond() to device (" + device + ") successful: " + success); + } + + // Immediately update the UI so that the user has feedback on their actions. + item.updateConnectionState(this /* context */, + BluetoothItem.CONNECTION_STATE_CONNECTING); + + default: + Log.w(TAG, "Encountered unknown bond state: " + device.getBondState()); + } + } + + private void nextAction(int resultCode) { + setResult(resultCode); + Intent nextIntent = WizardManagerHelper.getNextIntent(getIntent(), resultCode); + startActivityForResult(nextIntent, REQUEST_CODE_NEXT); + } + + /** + * A {@link BroadReceiver} that listens for when the bluetooth adapter has been turned on. + */ + private class BluetoothAdapterReceiver extends BroadcastReceiver { + @Override + public void onReceive(Context context, Intent intent) { + String action = intent.getAction(); + + if (action != null && action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) { + int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, + BluetoothAdapter.ERROR); + + if (state == BluetoothAdapter.STATE_ON) { + setUpAndStartScan(); + } + } + } + } + + /** + * Handles bluetooth scan responses and other indicators. + **/ + private class BluetoothScanReceiver extends BroadcastReceiver { + @Override + public void onReceive(Context context, Intent intent) { + String action = intent.getAction(); + + if (action == null) { + return; + } + + BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); + + if (Log.isLoggable(TAG, Log.VERBOSE)) { + Log.v(TAG, "Received device: " + device); + } + + switch (action) { + case BluetoothDevice.ACTION_FOUND: + if (Log.isLoggable(TAG, Log.VERBOSE)) { + Log.v(TAG, "Bluetooth device found"); + } + + mLayout.setProgressBarShown(false); + mScanningIndicator.setVisible(false); + mRescanIndicator.setVisible(true); + mBluetoothDeviceHierarchy.addOrUpdateDevice(context, device); + break; + + case BluetoothAdapter.ACTION_DISCOVERY_STARTED: + if (Log.isLoggable(TAG, Log.VERBOSE)) { + Log.v(TAG, "Bluetooth discovery started"); + } + + mLayout.setProgressBarShown(true); + mScanningIndicator.setVisible(true); + mRescanIndicator.setVisible(false); + mBluetoothDeviceHierarchy.clearAllDevices(); + break; + + case BluetoothAdapter.ACTION_DISCOVERY_FINISHED: + if (Log.isLoggable(TAG, Log.VERBOSE)) { + Log.v(TAG, "Bluetooth discovery finished"); + } + break; + + case BluetoothDevice.ACTION_BOND_STATE_CHANGED: + if (Log.isLoggable(TAG, Log.VERBOSE)) { + Log.v(TAG, "Bluetooth bond state changed"); + } + + mBluetoothDeviceHierarchy.addOrUpdateDevice(context, device); + + // When a bluetooth device has been paired, then move onto the next action so + // the user is not stuck on this screen for too long. + if (device.equals(mCurrentBondingDevice) + && device.getBondState() == BluetoothDevice.BOND_BONDED) { + nextAction(RESULT_OK); + } + break; + + case BluetoothDevice.ACTION_NAME_CHANGED: + if (Log.isLoggable(TAG, Log.VERBOSE)) { + Log.v(TAG, "Bluetooth device name chaged"); + } + mBluetoothDeviceHierarchy.addOrUpdateDevice(context, device); + break; + + default: + Log.w(TAG, "Unknown action received: " + action); + } + } + } +} |