src/com/android/bluetooth/a2dp/A2dpService.java

/*
 * Copyright (C) 2012 Google Inc.
 */
package com.android.bluetooth.a2dp;

import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothProfile;
import android.bluetooth.IBluetoothA2dp;
import android.content.Context;
import android.content.Intent;
import android.provider.Settings;
import android.util.Log;
import java.util.ArrayList;
import java.util.List;
import java.util.Iterator;
import java.util.Map;
import com.android.bluetooth.btservice.ProfileService;

/**
 * Provides Bluetooth A2DP profile, as a service in the Bluetooth application.
 * @hide
 */
public class A2dpService extends ProfileService {
    private static final boolean DBG = true;
    private static final String TAG="A2dpService";

    private A2dpStateMachine mStateMachine;

    protected String getName() {
        return TAG;
    }

    protected IProfileServiceBinder initBinder() {
        return new BluetoothA2dpBinder(this);
    }

    protected boolean start() {
        mStateMachine = new A2dpStateMachine(this,this);
        mStateMachine.start();
        return true;
    }

    protected boolean stop() {
        mStateMachine.quit();
        return true;
    }

    protected boolean cleanup() {
        if (mStateMachine!= null) {
            mStateMachine.cleanup();
            mStateMachine=null;
        }
        return true;
    }

    //API Methods
    boolean connect(BluetoothDevice device) {
        enforceCallingOrSelfPermission(BLUETOOTH_ADMIN_PERM,
                                       "Need BLUETOOTH ADMIN permission");

        if (getPriority(device) == BluetoothProfile.PRIORITY_OFF) {
            return false;
        }

        int connectionState = mStateMachine.getConnectionState(device);
        if (connectionState == BluetoothProfile.STATE_CONNECTED ||
            connectionState == BluetoothProfile.STATE_CONNECTING) {
            return false;
        }

        mStateMachine.sendMessage(A2dpStateMachine.CONNECT, device);
        return true;
    }

    boolean disconnect(BluetoothDevice device) {
        enforceCallingOrSelfPermission(BLUETOOTH_ADMIN_PERM,
                                       "Need BLUETOOTH ADMIN permission");
        int connectionState = mStateMachine.getConnectionState(device);
        if (connectionState != BluetoothProfile.STATE_CONNECTED &&
            connectionState != BluetoothProfile.STATE_CONNECTING) {
            return false;
        }

        mStateMachine.sendMessage(A2dpStateMachine.DISCONNECT, device);
        return true;
    }

    List<BluetoothDevice> getConnectedDevices() {
        enforceCallingOrSelfPermission(BLUETOOTH_PERM, "Need BLUETOOTH permission");
        return mStateMachine.getConnectedDevices();
    }

    List<BluetoothDevice> getDevicesMatchingConnectionStates(int[] states) {
        enforceCallingOrSelfPermission(BLUETOOTH_PERM, "Need BLUETOOTH permission");
        return mStateMachine.getDevicesMatchingConnectionStates(states);
    }

    int getConnectionState(BluetoothDevice device) {
        enforceCallingOrSelfPermission(BLUETOOTH_PERM, "Need BLUETOOTH permission");
        return mStateMachine.getConnectionState(device);
    }

    boolean setPriority(BluetoothDevice device, int priority) {
        enforceCallingOrSelfPermission(BLUETOOTH_ADMIN_PERM,
                                       "Need BLUETOOTH_ADMIN permission");
        Settings.Secure.putInt(getContentResolver(),
            Settings.Secure.getBluetoothA2dpSinkPriorityKey(device.getAddress()),
            priority);
        if (DBG) Log.d(TAG,"Saved priority " + device + " = " + priority);
        return true;
    }

    int getPriority(BluetoothDevice device) {
        enforceCallingOrSelfPermission(BLUETOOTH_ADMIN_PERM,
                                       "Need BLUETOOTH_ADMIN permission");
        int priority = Settings.Secure.getInt(getContentResolver(),
            Settings.Secure.getBluetoothA2dpSinkPriorityKey(device.getAddress()),
            BluetoothProfile.PRIORITY_UNDEFINED);
        return priority;
    }

    synchronized boolean isA2dpPlaying(BluetoothDevice device) {
        enforceCallingOrSelfPermission(BLUETOOTH_PERM,
                                       "Need BLUETOOTH permission");
        if (DBG) Log.d(TAG, "isA2dpPlaying(" + device + ")");
        return mStateMachine.isPlaying(device);
    }

    //Binder object: Must be static class or memory leak may occur 
    private static class BluetoothA2dpBinder extends IBluetoothA2dp.Stub 
        implements IProfileServiceBinder {
        private A2dpService mService;

        private A2dpService getService() {
            if (mService  != null && mService.isAvailable()) {
                return mService;
            }
            return null;
        }

        BluetoothA2dpBinder(A2dpService svc) {
            mService = svc;
        }

        public boolean cleanup()  {
            mService = null;
            return true;
        }

        public boolean connect(BluetoothDevice device) {
            A2dpService service = getService();
            if (service == null) return false;
            return service.connect(device);
        }

        public boolean disconnect(BluetoothDevice device) {
            A2dpService service = getService();
            if (service == null) return false;
            return service.disconnect(device);
        }

        public List<BluetoothDevice> getConnectedDevices() {
            A2dpService service = getService();
            if (service == null) return new ArrayList<BluetoothDevice>(0);
            return service.getConnectedDevices();
        }

        public List<BluetoothDevice> getDevicesMatchingConnectionStates(int[] states) {
            A2dpService service = getService();
            if (service == null) return new ArrayList<BluetoothDevice>(0);
            return service.getDevicesMatchingConnectionStates(states);
        }

        public int getConnectionState(BluetoothDevice device) {
            A2dpService service = getService();
            if (service == null) return BluetoothProfile.STATE_DISCONNECTED;
            return service.getConnectionState(device);
        }

        public boolean setPriority(BluetoothDevice device, int priority) {
            A2dpService service = getService();
            if (service == null) return false;
            return service.setPriority(device, priority);
        }

        public int getPriority(BluetoothDevice device) {
            A2dpService service = getService();
            if (service == null) return BluetoothProfile.PRIORITY_UNDEFINED;
            return service.getPriority(device);
        }

        public boolean isA2dpPlaying(BluetoothDevice device) {
            A2dpService service = getService();
            if (service == null) return false;
            return service.isA2dpPlaying(device);
        }
    };
}