标签：android style blog class ext http
Bluetooth low energy (BLE) is a
feature of Bluetooth 4.0 wireless radio technology, aimed at new,
principally low-power and low-latency, applications for wireless devices
within a short range. As I discussed in my previous blog about BLE
in Android, it has been acknowledged that using this technology in
devices will lead to very less power consumption and increase in
performance. BLE being a latest technology and in the development mode, is
not being used by many devices as of now but this is poised to change
soon. It will soon become an essential part of devices that use
Bluetooth.
As the Bluetooth Low Energy stack is available with
some third party vendors, they have their own set of APIs for BLE
programming. You just need to include their API add-ons into your Android
apps to access the BLE features.
As we know that in Android,
there is no generic API for BLE. Different vendors give their own
API's for Android
App development. Here we are going to discuss about Motorola API. The
profile specification allows performing the read and writing operations
only when the Bluetooth Low Energy API's allow connecting with
the remote device.
Some developments have been done with BLE to
support the latest Android version ICS (Ice Cream
Sandwich) and I have tried to summarize some useful information
for you to implement with your latest Motorola device having ICS.
Use this link to download the Add-on for ICS (Ice Cream
Sandwich) operating system.
Two libraries,
BluetoothGattService.jar and BluetoothGatt.jar are used in Android
project.
You need to create two files:
i)
android.bluetooth.IBluetoothGattProfile; //This file needs to be
created
interface IBluetoothGattProfile {
void
onDiscoverCharacteristicsResult(in String path, in boolean result);
void onSetCharacteristicValueResult(in String path, in boolean
result);
void onSetCharacteristicCliConfResult(in String path, in
boolean result);
void onUpdateCharacteristicValueResult(in String
path, in boolean result);
void onValueChanged(in String path, in
String value);
}
ii)com.motorola.bluetooth.bluetoothle.IBluetoothGattCallback;
//This file needs to be created
/**
* System private API for
Bluetooth GATT Service
*
*
*/
oneway interface
IBluetoothGattCallback
{
void indicationGattCb (in BluetoothDevice
device, String uuid, String char_handle, in String[] data);
void
notificationGattCb (in BluetoothDevice device , String uuid, String
char_handle, in byte[] data);
}
Now in main activity,
initially you have to scan for bluetooth devices and then check for the
BLE device by calling function getBluetoothDeviceType().
If it returns LE that means the device you scanned for is
a BLE device
After that you need to call
getGattServices(uuid, device) for searching the primary
device.
private boolean getGattServices(ParcelUuid uuid,
BluetoothDevice btDevice)
{
Log.d(TAG, "Calling
btDevice.getGattServices");
return
btDevice.getGattServices(uuid.getUuid());
}
Parameters
Device: Device address of the GATT server being connected to.
Uuid:
UUID of the primary service to which your profile is connecting.
Then you get the broadcast with the action
BluetoothDevice.ACTION_GATT and then call the
function
getBluetoothGattService(selectedServiceObjPath,
uuid);
private void getBluetoothGattService(String
objPath, ParcelUuid uuid)
{
if (mDevice != null)
{
BluetoothGattService gattService = new
BluetoothGattService(mDevice,uid,objPath,btGattCallback);
if
(gattService != null)
{
uuidGattSrvMap.put(uuid, gattService);
return;
}
else
{
Log.e(TAG, "Gatt service is
null for UUID");
}
}
else
{
Log.e(TAG,
mDevice is null");
}
mLeState = DISCONNECTED;
Toast.makeText(mContext,"Connection Failed",
Toast.LENGTH_SHORT).show();
}
Parameters in
BluetoothGattService
device: device address of the GATT
server being connected to.
Uuid : UUID of the primary service to
which your profile is connecting.
Callback:
IBluetoothGattProfile.Stub objects that receives user data from the
connected service.
Methods used by Bluetooth LE
profiles
i) How to read the value of a
service
gattService.updateCharacteristicValue(objPath)
objPath is a mapped path for the service you want to
read.
ii) How to write a value
gattService.writeCharacteristicRaw(objPath, data, true);
objPath is a
mapped path for the service you want to write.
Data is a byte array
which you want to write
iii) How to disconnect
gattService.close();
NOTE: You can find the
sample inside the Motorola Add-ons. The above mentioned API is still in
development mode and you might come across with some development issues
(bugs) as it is a BETA Release.
How to Implement Bluetooth Low Energy (BLE) in Ice Cream Sandwich,布布扣,bubuko.com
How to Implement Bluetooth Low Energy (BLE) in Ice Cream Sandwich
标签：android style blog class ext http
原文地址：http://www.cnblogs.com/savagemorgan/p/3716864.html
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