diff options
Diffstat (limited to 'core/java/android/bluetooth/BluetoothClass.java')
| -rw-r--r-- | core/java/android/bluetooth/BluetoothClass.java | 276 |
1 files changed, 210 insertions, 66 deletions
diff --git a/core/java/android/bluetooth/BluetoothClass.java b/core/java/android/bluetooth/BluetoothClass.java index 88ce18b..bc06713 100644 --- a/core/java/android/bluetooth/BluetoothClass.java +++ b/core/java/android/bluetooth/BluetoothClass.java @@ -16,39 +16,98 @@ package android.bluetooth; +import android.os.Parcel; +import android.os.Parcelable; + /** - * The Android Bluetooth API is not finalized, and *will* change. Use at your - * own risk. - * - * Static helper methods and constants to decode the device class bit vector - * returned by the Bluetooth API. + * Represents a Bluetooth class, which describes general characteristics + * and capabilities of a device. For example, a Bluetooth class will + * specify the general device type such as a phone, a computer, or + * headset, and whether it's capable of services such as audio or telephony. * - * The Android Bluetooth API returns a 32-bit integer to represent the class. - * The format of these bits is defined at - * http://www.bluetooth.org/Technical/AssignedNumbers/baseband.htm - * (login required). This class provides static helper methods and constants to - * determine what Service Class(es) and Device Class are encoded in the 32-bit - * class. + * <p>The Bluetooth class is useful as a hint to roughly describe a device (for example to + * show an icon in the UI), but does not reliably describe which Bluetooth + * profiles or services are actually supported by a device. * - * Devices typically have zero or more service classes, and exactly one device - * class. The device class is encoded as a major and minor device class, the - * minor being a subset of the major. + * <p>Every Bluetooth class is composed of zero or more service classes, and + * exactly one device class. The device class is further broken down into major + * and minor device class components. * - * Class is useful to describe a device (for example to show an icon), - * but does not reliably describe what profiles a device supports. To determine - * profile support you usually need to perform SDP queries. + * <p>{@link BluetoothClass} is useful as a hint to roughly describe a device + * (for example to show an icon in the UI), but does not reliably describe which + * Bluetooth profiles or services are actually supported by a device. Accurate + * service discovery is done through SDP requests, which are automatically + * performed when creating an RFCOMM socket with {@link + * BluetoothDevice#createRfcommSocketToServiceRecord(UUID)} and {@link + * BluetoothAdapter#listenUsingRfcommWithServiceRecord(String,UUID)}</p> * - * Each of these helper methods takes the 32-bit integer class as an argument. + * <p>Use {@link BluetoothDevice#getBluetoothClass} to retrieve the class for + * a remote device. * - * @hide + * <!-- + * The Bluetooth class is a 32 bit field. The format of these bits is defined at + * http://www.bluetooth.org/Technical/AssignedNumbers/baseband.htm + * (login required). This class contains that 32 bit field, and provides + * constants and methods to determine which Service Class(es) and Device Class + * are encoded in that field. + * --> */ -public class BluetoothClass { - /** Indicates the Bluetooth API could not retrieve the class */ +public final class BluetoothClass implements Parcelable { + /** + * Legacy error value. Applications should use null instead. + * @hide + */ public static final int ERROR = 0xFF000000; - /** Every Bluetooth device has zero or more service classes */ - public static class Service { - public static final int BITMASK = 0xFFE000; + private final int mClass; + + /** @hide */ + public BluetoothClass(int classInt) { + mClass = classInt; + } + + @Override + public boolean equals(Object o) { + if (o instanceof BluetoothClass) { + return mClass == ((BluetoothClass)o).mClass; + } + return false; + } + + @Override + public int hashCode() { + return mClass; + } + + @Override + public String toString() { + return Integer.toHexString(mClass); + } + + public int describeContents() { + return 0; + } + + public static final Parcelable.Creator<BluetoothClass> CREATOR = + new Parcelable.Creator<BluetoothClass>() { + public BluetoothClass createFromParcel(Parcel in) { + return new BluetoothClass(in.readInt()); + } + public BluetoothClass[] newArray(int size) { + return new BluetoothClass[size]; + } + }; + + public void writeToParcel(Parcel out, int flags) { + out.writeInt(mClass); + } + + /** + * Defines all service class constants. + * <p>Each {@link BluetoothClass} encodes zero or more service classes. + */ + public static final class Service { + private static final int BITMASK = 0xFFE000; public static final int LIMITED_DISCOVERABILITY = 0x002000; public static final int POSITIONING = 0x010000; @@ -59,32 +118,41 @@ public class BluetoothClass { public static final int AUDIO = 0x200000; public static final int TELEPHONY = 0x400000; public static final int INFORMATION = 0x800000; + } - /** Returns true if the given class supports the given Service Class. - * A bluetooth device can claim to support zero or more service classes. - * @param btClass The bluetooth class. - * @param serviceClass The service class constant to test for. For - * example, Service.AUDIO. Must be one of the - * Service.FOO constants. - * @return True if the service class is supported. - */ - public static boolean hasService(int btClass, int serviceClass) { - if (btClass == ERROR) { - return false; - } - return ((btClass & Service.BITMASK & serviceClass) != 0); - } + /** + * Return true if the specified service class is supported by this + * {@link BluetoothClass}. + * <p>Valid service classes are the public constants in + * {@link BluetoothClass.Service}. For example, {@link + * BluetoothClass.Service#AUDIO}. + * + * @param service valid service class + * @return true if the service class is supported + */ + public boolean hasService(int service) { + return ((mClass & Service.BITMASK & service) != 0); } - /** Every Bluetooth device has exactly one device class, comprimised of - * major and minor components. We have not included the minor classes for - * major classes: NETWORKING, PERIPHERAL and IMAGING yet because they work - * a little differently. */ + /** + * Defines all device class constants. + * <p>Each {@link BluetoothClass} encodes exactly one device class, with + * major and minor components. + * <p>The constants in {@link + * BluetoothClass.Device} represent a combination of major and minor + * device components (the complete device class). The constants in {@link + * BluetoothClass.Device.Major} represent only major device classes. + * <p>See {@link BluetoothClass.Service} for service class constants. + */ public static class Device { - public static final int BITMASK = 0x1FFC; + private static final int BITMASK = 0x1FFC; + /** + * Defines all major device class constants. + * <p>See {@link BluetoothClass.Device} for minor classes. + */ public static class Major { - public static final int BITMASK = 0x1F00; + private static final int BITMASK = 0x1F00; public static final int MISC = 0x0000; public static final int COMPUTER = 0x0100; @@ -97,18 +165,6 @@ public class BluetoothClass { public static final int TOY = 0x0800; public static final int HEALTH = 0x0900; public static final int UNCATEGORIZED = 0x1F00; - - /** Returns the Major Device Class component of a bluetooth class. - * Values returned from this function can be compared with the constants - * Device.Major.FOO. A bluetooth device can only be associated - * with one major class. - */ - public static int getDeviceMajor(int btClass) { - if (btClass == ERROR) { - return ERROR; - } - return (btClass & Device.Major.BITMASK); - } } // Devices in the COMPUTER major class @@ -174,18 +230,106 @@ public class BluetoothClass { public static final int HEALTH_PULSE_OXIMETER = 0x0914; public static final int HEALTH_PULSE_RATE = 0x0918; public static final int HEALTH_DATA_DISPLAY = 0x091C; + } - /** Returns the Device Class component of a bluetooth class. This includes - * both the major and minor device components. Values returned from this - * function can be compared with the constants Device.FOO. A bluetooth - * device can only be associated with one device class. - */ - public static int getDevice(int btClass) { - if (btClass == ERROR) { - return ERROR; + /** + * Return the major device class component of this {@link BluetoothClass}. + * <p>Values returned from this function can be compared with the + * public constants in {@link BluetoothClass.Device.Major} to determine + * which major class is encoded in this Bluetooth class. + * + * @return major device class component + */ + public int getMajorDeviceClass() { + return (mClass & Device.Major.BITMASK); + } + + /** + * Return the (major and minor) device class component of this + * {@link BluetoothClass}. + * <p>Values returned from this function can be compared with the + * public constants in {@link BluetoothClass.Device} to determine which + * device class is encoded in this Bluetooth class. + * + * @return device class component + */ + public int getDeviceClass() { + return (mClass & Device.BITMASK); + } + + /** @hide */ + public static final int PROFILE_HEADSET = 0; + /** @hide */ + public static final int PROFILE_A2DP = 1; + /** @hide */ + public static final int PROFILE_OPP = 2; + + /** + * Check class bits for possible bluetooth profile support. + * This is a simple heuristic that tries to guess if a device with the + * given class bits might support specified profile. It is not accurate for all + * devices. It tries to err on the side of false positives. + * @param profile The profile to be checked + * @return True if this device might support specified profile. + * @hide + */ + public boolean doesClassMatch(int profile) { + if (profile == PROFILE_A2DP) { + if (hasService(Service.RENDER)) { + return true; + } + // By the A2DP spec, sinks must indicate the RENDER service. + // However we found some that do not (Chordette). So lets also + // match on some other class bits. + switch (getDeviceClass()) { + case Device.AUDIO_VIDEO_HIFI_AUDIO: + case Device.AUDIO_VIDEO_HEADPHONES: + case Device.AUDIO_VIDEO_LOUDSPEAKER: + case Device.AUDIO_VIDEO_CAR_AUDIO: + return true; + default: + return false; + } + } else if (profile == PROFILE_HEADSET) { + // The render service class is required by the spec for HFP, so is a + // pretty good signal + if (hasService(Service.RENDER)) { + return true; } - return (btClass & Device.BITMASK); + // Just in case they forgot the render service class + switch (getDeviceClass()) { + case Device.AUDIO_VIDEO_HANDSFREE: + case Device.AUDIO_VIDEO_WEARABLE_HEADSET: + case Device.AUDIO_VIDEO_CAR_AUDIO: + return true; + default: + return false; + } + } else if (profile == PROFILE_OPP) { + if (hasService(Service.OBJECT_TRANSFER)) { + return true; + } + + switch (getDeviceClass()) { + case Device.COMPUTER_UNCATEGORIZED: + case Device.COMPUTER_DESKTOP: + case Device.COMPUTER_SERVER: + case Device.COMPUTER_LAPTOP: + case Device.COMPUTER_HANDHELD_PC_PDA: + case Device.COMPUTER_PALM_SIZE_PC_PDA: + case Device.COMPUTER_WEARABLE: + case Device.PHONE_UNCATEGORIZED: + case Device.PHONE_CELLULAR: + case Device.PHONE_CORDLESS: + case Device.PHONE_SMART: + case Device.PHONE_MODEM_OR_GATEWAY: + case Device.PHONE_ISDN: + return true; + default: + return false; + } + } else { + return false; } } } - |