settings/bluetooth/DockService.java

/*
 * Copyright (C) 2009 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.settings.bluetooth;

import android.app.AlertDialog;
import android.app.Notification;
import android.app.Service;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager;
import android.widget.CheckBox;
import android.widget.CompoundButton;

import com.android.settings.R;
import com.android.settings.bluetooth.LocalBluetoothProfileManager.Profile;

public class DockService extends Service implements AlertDialog.OnMultiChoiceClickListener,
        DialogInterface.OnClickListener, DialogInterface.OnDismissListener,
        CompoundButton.OnCheckedChangeListener {

    private static final String TAG = "DockService";

    private static final boolean DEBUG = false;

    // Time allowed for the device to be undocked and redocked without severing
    // the bluetooth connection
    private static final long UNDOCKED_GRACE_PERIOD = 1000;

    // Msg for user wanting the UI to setup the dock
    private static final int MSG_TYPE_SHOW_UI = 111;

    // Msg for device docked event
    private static final int MSG_TYPE_DOCKED = 222;

    // Msg for device undocked event
    private static final int MSG_TYPE_UNDOCKED_TEMPORARY = 333;

    // Msg for undocked command to be process after UNDOCKED_GRACE_PERIOD millis
    // since MSG_TYPE_UNDOCKED_TEMPORARY
    private static final int MSG_TYPE_UNDOCKED_PERMANENT = 444;

    // Created in OnCreate()
    private volatile Looper mServiceLooper;
    private volatile ServiceHandler mServiceHandler;
    private DockService mContext;
    private LocalBluetoothManager mBtManager;

    // Normally set after getting a docked event and unset when the connection
    // is severed. One exception is that mDevice could be null if the service
    // was started after the docked event.
    private BluetoothDevice mDevice;

    // Created and used for the duration of the dialog
    private AlertDialog mDialog;
    private Profile[] mProfiles;
    private boolean[] mCheckedItems;
    private int mStartIdAssociatedWithDialog;

    // Set while BT is being enabled.
    private BluetoothDevice mPendingDevice;
    private int mPendingStartId;

    private boolean mRegistered;
    private Object mBtSynchroObject = new Object();

    @Override
    public void onCreate() {
        if (DEBUG) Log.d(TAG, "onCreate");

        mBtManager = LocalBluetoothManager.getInstance(this);
        mContext = this;

        HandlerThread thread = new HandlerThread("DockService");
        thread.start();

        mServiceLooper = thread.getLooper();
        mServiceHandler = new ServiceHandler(mServiceLooper);
    }

    @Override
    public void onDestroy() {
        if (DEBUG) Log.d(TAG, "onDestroy");
        if (mDialog != null) {
            mDialog.dismiss();
            mDialog = null;
        }
        if (mRegistered) {
            unregisterReceiver(mReceiver);
            mRegistered = false;
        }
        mServiceLooper.quit();
    }

    @Override
    public IBinder onBind(Intent intent) {
        // not supported
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        if (DEBUG) Log.d(TAG, "onStartCommand startId:" + startId + " flags: " + flags);

        if (intent == null) {
            // Nothing to process, stop.
            if (DEBUG) Log.d(TAG, "START_NOT_STICKY - intent is null.");

            // NOTE: We MUST not call stopSelf() directly, since we need to
            // make sure the wake lock acquired by the Receiver is released.
            DockEventReceiver.finishStartingService(this, startId);
            return START_NOT_STICKY;
        }

        Message msg = parseIntent(intent);
        if (msg == null) {
            // Bad intent
            if (DEBUG) Log.d(TAG, "START_NOT_STICKY - Bad intent.");
            DockEventReceiver.finishStartingService(this, startId);
            return START_NOT_STICKY;
        }

        msg.arg2 = startId;
        processMessage(msg);

        return START_NOT_STICKY;
    }

    private final class ServiceHandler extends Handler {
        public ServiceHandler(Looper looper) {
            super(looper);
        }

        @Override
        public void handleMessage(Message msg) {
            processMessage(msg);
        }
    }

    // This method gets messages from both onStartCommand and mServiceHandler/mServiceLooper
    private synchronized void processMessage(Message msg) {
        int msgType = msg.what;
        int state = msg.arg1;
        int startId = msg.arg2;
        BluetoothDevice device = (BluetoothDevice) msg.obj;

        if(DEBUG) Log.d(TAG, "processMessage: " + msgType + " state: " + state + " device = "
                + (msg.obj == null ? "null" : device.toString()));

        switch (msgType) {
            case MSG_TYPE_SHOW_UI:
                if (mDialog != null) {
                    // Shouldn't normally happen
                    mDialog.dismiss();
                    mDialog = null;
                }
                mDevice = device;
                createDialog(mContext, mDevice, state, startId);
                break;

            case MSG_TYPE_DOCKED:
                if (DEBUG) {
                    // TODO figure out why hasMsg always returns false if device
                    // is supplied
                    Log.d(TAG, "1 Has undock perm msg = "
                            + mServiceHandler.hasMessages(MSG_TYPE_UNDOCKED_PERMANENT, mDevice));
                    Log.d(TAG, "2 Has undock perm msg = "
                            + mServiceHandler.hasMessages(MSG_TYPE_UNDOCKED_PERMANENT, device));
                }

                mServiceHandler.removeMessages(MSG_TYPE_UNDOCKED_PERMANENT);

                if (!device.equals(mDevice)) {
                    if (mDevice != null) {
                        // Not expected. Cleanup/undock existing
                        handleUndocked(mContext, mBtManager, mDevice);
                    }

                    mDevice = device;
                    if (mBtManager.getDockAutoConnectSetting(device.getAddress())) {
                        // Setting == auto connect
                        initBtSettings(mContext, device, state, false);
                        applyBtSettings(mDevice, startId);
                    } else {
                        createDialog(mContext, mDevice, state, startId);
                    }
                }
                break;

            case MSG_TYPE_UNDOCKED_PERMANENT:
                // Grace period passed. Disconnect.
                handleUndocked(mContext, mBtManager, device);
                break;

            case MSG_TYPE_UNDOCKED_TEMPORARY:
                // Undocked event received. Queue a delayed msg to sever connection
                Message newMsg = mServiceHandler.obtainMessage(MSG_TYPE_UNDOCKED_PERMANENT, state,
                        startId, device);
                mServiceHandler.sendMessageDelayed(newMsg, UNDOCKED_GRACE_PERIOD);
                break;
        }

        if (mDialog == null && mPendingDevice == null && msgType != MSG_TYPE_UNDOCKED_TEMPORARY) {
            // NOTE: We MUST not call stopSelf() directly, since we need to
            // make sure the wake lock acquired by the Receiver is released.
            DockEventReceiver.finishStartingService(DockService.this, startId);
        }
    }

    private Message parseIntent(Intent intent) {
        BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
        int state = intent.getIntExtra(Intent.EXTRA_DOCK_STATE, -1234);

        if (DEBUG) {
            Log.d(TAG, "Action: " + intent.getAction() + " State:" + state
                    + " Device: " + (device == null ? "null" : device.getName()));
        }

        if (device == null) {
            Log.w(TAG, "device is null");
            return null;
        }

        int msgType;
        switch (state) {
            case Intent.EXTRA_DOCK_STATE_UNDOCKED:
                msgType = MSG_TYPE_UNDOCKED_TEMPORARY;
                break;
            case Intent.EXTRA_DOCK_STATE_DESK:
            case Intent.EXTRA_DOCK_STATE_CAR:
                if (DockEventReceiver.ACTION_DOCK_SHOW_UI.equals(intent.getAction())) {
                    msgType = MSG_TYPE_SHOW_UI;
                } else {
                    msgType = MSG_TYPE_DOCKED;
                }
                break;
            default:
                return null;
        }

        return mServiceHandler.obtainMessage(msgType, state, 0, device);
    }

    private boolean createDialog(DockService service, BluetoothDevice device, int state,
            int startId) {
        switch (state) {
            case Intent.EXTRA_DOCK_STATE_CAR:
            case Intent.EXTRA_DOCK_STATE_DESK:
                break;
            default:
                return false;
        }

        startForeground(0, new Notification());

        // Device in a new dock.
        boolean firstTime = !mBtManager.hasDockAutoConnectSetting(device.getAddress());

        CharSequence[] items = initBtSettings(service, device, state, firstTime);

        final AlertDialog.Builder ab = new AlertDialog.Builder(service);
        ab.setTitle(service.getString(R.string.bluetooth_dock_settings_title));

        // Profiles
        ab.setMultiChoiceItems(items, mCheckedItems, service);

        // Remember this settings
        LayoutInflater inflater = (LayoutInflater) service
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        float pixelScaleFactor = service.getResources().getDisplayMetrics().density;
        View view = inflater.inflate(R.layout.remember_dock_setting, null);
        CheckBox rememberCheckbox = (CheckBox) view.findViewById(R.id.remember);

        // check "Remember setting" by default if no value was saved
        boolean checked = firstTime || mBtManager.getDockAutoConnectSetting(device.getAddress());
        rememberCheckbox.setChecked(checked);
        rememberCheckbox.setOnCheckedChangeListener(this);
        int viewSpacingLeft = (int) (14 * pixelScaleFactor);
        int viewSpacingRight = (int) (14 * pixelScaleFactor);
        ab.setView(view, viewSpacingLeft, 0 /* top */, viewSpacingRight, 0 /* bottom */);
        if (DEBUG) {
            Log.d(TAG, "Auto connect = "
                    + mBtManager.getDockAutoConnectSetting(device.getAddress()));
        }

        // Ok Button
        ab.setPositiveButton(service.getString(android.R.string.ok), service);

        mStartIdAssociatedWithDialog = startId;
        mDialog = ab.create();
        mDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG);
        mDialog.setOnDismissListener(service);
        mDialog.show();
        return true;
    }

    // Called when the individual bt profiles are clicked.
    public void onClick(DialogInterface dialog, int which, boolean isChecked) {
        if (DEBUG) Log.d(TAG, "Item " + which + " changed to " + isChecked);
        mCheckedItems[which] = isChecked;
    }

    // Called when the "Remember" Checkbox is clicked
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if (DEBUG) Log.d(TAG, "onCheckedChanged: Remember Settings = " + isChecked);
        if (mDevice != null) {
            mBtManager.saveDockAutoConnectSetting(mDevice.getAddress(), isChecked);
        }
    }

    // Called when the dialog is dismissed
    public void onDismiss(DialogInterface dialog) {
        // NOTE: We MUST not call stopSelf() directly, since we need to
        // make sure the wake lock acquired by the Receiver is released.
        if (mPendingDevice == null) {
            DockEventReceiver.finishStartingService(mContext, mStartIdAssociatedWithDialog);
        }
        mContext.stopForeground(true);
    }

    // Called when clicked on the OK button
    public void onClick(DialogInterface dialog, int which) {
        if (which == DialogInterface.BUTTON_POSITIVE && mDevice != null) {
            if (!mBtManager.hasDockAutoConnectSetting(mDevice.getAddress())) {
                mBtManager.saveDockAutoConnectSetting(mDevice.getAddress(), true);
            }

            applyBtSettings(mDevice, mStartIdAssociatedWithDialog);
        }
    }

    private CharSequence[] initBtSettings(DockService service, BluetoothDevice device, int state,
            boolean firstTime) {
        // TODO Avoid hardcoding dock and profiles. Read from system properties
        int numOfProfiles = 0;
        switch (state) {
            case Intent.EXTRA_DOCK_STATE_DESK:
                numOfProfiles = 1;
                break;
            case Intent.EXTRA_DOCK_STATE_CAR:
                numOfProfiles = 2;
                break;
            default:
                return null;
        }

        mProfiles = new Profile[numOfProfiles];
        mCheckedItems = new boolean[numOfProfiles];
        CharSequence[] items = new CharSequence[numOfProfiles];

        switch (state) {
            case Intent.EXTRA_DOCK_STATE_CAR:
                items[0] = service.getString(R.string.bluetooth_dock_settings_headset);
                items[1] = service.getString(R.string.bluetooth_dock_settings_a2dp);
                mProfiles[0] = Profile.HEADSET;
                mProfiles[1] = Profile.A2DP;
                if (firstTime) {
                    // Enable by default for car dock
                    mCheckedItems[0] = true;
                    mCheckedItems[1] = true;
                } else {
                    mCheckedItems[0] = LocalBluetoothProfileManager.getProfileManager(mBtManager,
                            Profile.HEADSET).isPreferred(device);
                    mCheckedItems[1] = LocalBluetoothProfileManager.getProfileManager(mBtManager,
                            Profile.A2DP).isPreferred(device);
                }
                break;

            case Intent.EXTRA_DOCK_STATE_DESK:
                items[0] = service.getString(R.string.bluetooth_dock_settings_a2dp);
                mProfiles[0] = Profile.A2DP;
                if (firstTime) {
                    // Disable by default for desk dock
                    mCheckedItems[0] = false;
                } else {
                    mCheckedItems[0] = LocalBluetoothProfileManager.getProfileManager(mBtManager,
                            Profile.A2DP).isPreferred(device);
                }
                break;
        }
        return items;
    }

    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
            if (state == BluetoothAdapter.STATE_ON && mPendingDevice != null) {
                synchronized (mBtSynchroObject) {
                    if (mPendingDevice.equals(mDevice)) {
                        if(DEBUG) Log.d(TAG, "applying settings");
                        applyBtSettings(mPendingDevice, mPendingStartId);
                    } else if(DEBUG) {
                        Log.d(TAG, "mPendingDevice  (" + mPendingDevice + ") != mDevice ("
                                + mDevice + ")");
                    }

                    mPendingDevice = null;
                    DockEventReceiver.finishStartingService(mContext, mPendingStartId);
                }
            }
        }
    };

    private synchronized void applyBtSettings(final BluetoothDevice device, int startId) {
        if (device == null || mProfiles == null || mCheckedItems == null)
            return;

        // Turn on BT if something is enabled
        synchronized (mBtSynchroObject) {
            for (boolean enable : mCheckedItems) {
                if (enable) {
                    int btState = mBtManager.getBluetoothState();
                    switch (btState) {
                        case BluetoothAdapter.STATE_OFF:
                        case BluetoothAdapter.STATE_TURNING_OFF:
                        case BluetoothAdapter.STATE_TURNING_ON:
                            if (mPendingDevice != null && mPendingDevice.equals(mDevice)) {
                                return;
                            }
                            if (!mRegistered) {
                                registerReceiver(mReceiver, new IntentFilter(
                                        BluetoothAdapter.ACTION_STATE_CHANGED));
                            }
                            mPendingDevice = device;
                            mRegistered = true;
                            mPendingStartId = startId;
                            if (btState != BluetoothAdapter.STATE_TURNING_ON) {
                                // BT is off. Enable it
                                mBtManager.getBluetoothAdapter().enable();
                            }
                            return;
                    }
                }
            }
        }

        mPendingDevice = null;

        boolean callConnect = false;
        CachedBluetoothDevice cachedDevice = getCachedBluetoothDevice(mContext, mBtManager,
                device);
        for (int i = 0; i < mProfiles.length; i++) {
            LocalBluetoothProfileManager profileManager = LocalBluetoothProfileManager
                    .getProfileManager(mBtManager, mProfiles[i]);

            if (DEBUG) Log.d(TAG, mProfiles[i].toString() + " = " + mCheckedItems[i]);

            if (mCheckedItems[i]) {
                // Checked but not connected
                callConnect = true;
            } else if (!mCheckedItems[i]) {
                // Unchecked but connected
                if (DEBUG) Log.d(TAG, "applyBtSettings - Disconnecting");
                cachedDevice.disconnect(mProfiles[i]);
            }
            profileManager.setPreferred(device, mCheckedItems[i]);
            if (DEBUG) {
                if (mCheckedItems[i] != profileManager.isPreferred(device)) {
                    Log.e(TAG, "Can't save prefered value");
                }
            }
        }

        if (callConnect) {
            if (DEBUG) Log.d(TAG, "applyBtSettings - Connecting");
            cachedDevice.connect();
        }
    }

    private synchronized void handleUndocked(Context context, LocalBluetoothManager localManager,
            BluetoothDevice device) {
        if (mDialog != null) {
            mDialog.dismiss();
            mDialog = null;
        }
        mDevice = null;
        mPendingDevice = null;
        CachedBluetoothDevice cachedBluetoothDevice = getCachedBluetoothDevice(context,
                localManager, device);
        cachedBluetoothDevice.disconnect();
    }

    private static CachedBluetoothDevice getCachedBluetoothDevice(Context context,
            LocalBluetoothManager localManager, BluetoothDevice device) {
        CachedBluetoothDeviceManager cachedDeviceManager = localManager.getCachedDeviceManager();
        CachedBluetoothDevice cachedBluetoothDevice = cachedDeviceManager.findDevice(device);
        if (cachedBluetoothDevice == null) {
            cachedBluetoothDevice = new CachedBluetoothDevice(context, device);
        }
        return cachedBluetoothDevice;
    }
}