具有低功耗蓝牙模块的设备可以扮演2个角色，中心，周边。周边是数据提供者，中心是数据接收/处理者。自Android 4.3的系统就规定了BLE的API，但是仅限于中心，至于周边一直没有API的支持。直到Android 5.0的出现，才带来了周边API的支持(BluetoothLeAdvertiser)。
public class Main4Activity extends AppCompatActivity implements View.OnClickListener {
public final static UUID CLIENT_CHARACTERISTIC_CONFIG = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb");
public final static UUID UUID_LOST_SERVICE = UUID.fromString("0000fff0-0000-1000-8000-00805f9b34fb");
public final static UUID UUID_LOST_WRITE = UUID.fromString("0000fff1-0000-1000-8000-00805f9b34fb");
public final static UUID UUID_LOST_ENABLE = UUID.fromString("0000fff2-0000-1000-8000-00805f9b34fb");
private static final String TAG = "yushu";
private TextView txtDevice;
private Button btnStart;
private Button btnNotify;
private Button btnStop;
private BluetoothManager mBluetoothManager;
private BluetoothLeAdvertiser mBluetoothLeAdvertiser;
private BluetoothGattServer gattServer;
private BluetoothGattCharacteristic characterNotify;
private BluetoothDevice bluetoothDevice;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main4);
initView();
initBLE();
setServer();
}
private void initView() {
txtDevice = (TextView) findViewById(R.id.txt_device);
btnStart = (Button) findViewById(R.id.btn_start);
btnNotify = (Button) findViewById(R.id.btn_notify);
btnStop = (Button) findViewById(R.id.btn_stop);
btnNotify.setOnClickListener(this);
btnStart.setOnClickListener(this);
btnStop.setOnClickListener(this);
}
/**
* 初始化蓝牙
*/
private void initBLE() {
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
Toast.makeText(this, "不支持BLE", Toast.LENGTH_LONG).show();
finish();
}
mBluetoothManager = (BluetoothManager) getSystemService(BLUETOOTH_SERVICE);
BluetoothAdapter mBluetoothAdapter = mBluetoothManager.getAdapter();
if (mBluetoothAdapter == null) {
Toast.makeText(this, "蓝牙不支持", Toast.LENGTH_LONG).show();
finish();
}
assert mBluetoothAdapter != null;
mBluetoothLeAdvertiser = mBluetoothAdapter.getBluetoothLeAdvertiser();
if (mBluetoothLeAdvertiser == null) {
Toast.makeText(this, "the device not support peripheral", Toast.LENGTH_SHORT).show();
finish();
}
}
/**
* 添加服务，特征
*/
private void setServer() {
//读写特征
BluetoothGattCharacteristic characterWrite = new BluetoothGattCharacteristic(
UUID_LOST_WRITE, BluetoothGattCharacteristic.PROPERTY_READ | BluetoothGattCharacteristic.PROPERTY_WRITE,
BluetoothGattCharacteristic.PERMISSION_READ | BluetoothGattCharacteristic.PERMISSION_WRITE);
//使能特征
characterNotify = new BluetoothGattCharacteristic(UUID_LOST_ENABLE,
BluetoothGattCharacteristic.PROPERTY_NOTIFY, BluetoothGattCharacteristic.PERMISSION_READ);
characterNotify.addDescriptor(new BluetoothGattDescriptor(CLIENT_CHARACTERISTIC_CONFIG, BluetoothGattDescriptor.PERMISSION_WRITE | BluetoothGattCharacteristic.PERMISSION_READ));
//服务
BluetoothGattService gattService = new BluetoothGattService(UUID_LOST_SERVICE,
BluetoothGattService.SERVICE_TYPE_PRIMARY);
//为服务添加特征
gattService.addCharacteristic(characterWrite);
gattService.addCharacteristic(characterNotify);
//管理服务，连接和数据交互回调
gattServer = mBluetoothManager.openGattServer(this,
new BluetoothGattServerCallback() {
@Override
public void onConnectionStateChange(final BluetoothDevice device,
final int status, final int newState) {
super.onConnectionStateChange(device, status, newState);
bluetoothDevice = device;
Log.d("Chris", "onConnectionStateChange:" + device + " " + status + " " + newState);
runOnUiThread(new Runnable() {
@Override
public void run() {
txtDevice.setText(device.getAddress() + " " + device.getName() + " " + status + " " + newState);
}
});
}
@Override
public void onServiceAdded(int status,
BluetoothGattService service) {
super.onServiceAdded(status, service);
Log.d("Chris", "service added");
}
@Override
public void onCharacteristicReadRequest(
BluetoothDevice device, int requestId, int offset,
BluetoothGattCharacteristic characteristic) {
super.onCharacteristicReadRequest(device, requestId,
offset, characteristic);
gattServer.sendResponse(device, requestId, BluetoothGatt.GATT_SUCCESS, offset, characteristic.getValue());
Log.d("Chris", "onCharacteristicReadRequest");
}
@Override
public void onCharacteristicWriteRequest(
BluetoothDevice device, int requestId,
BluetoothGattCharacteristic characteristic,
boolean preparedWrite, boolean responseNeeded,
int offset, final byte[] value) {
super.onCharacteristicWriteRequest(device, requestId,
characteristic, preparedWrite, responseNeeded,
offset, value);
gattServer.sendResponse(device, requestId, BluetoothGatt.GATT_SUCCESS, offset, null);
Log.d("Chris", "onCharacteristicWriteRequest" + value[0]);
runOnUiThread(new Runnable() {
@SuppressLint("SetTextI18n")
@Override
public void run() {
txtDevice.setText(value[0] + "");
}
});
}
@Override
public void onNotificationSent(BluetoothDevice device, int status) {
super.onNotificationSent(device, status);
Log.i(TAG, "onNotificationSent: ");
}
@Override
public void onMtuChanged(BluetoothDevice device, int mtu) {
super.onMtuChanged(device, mtu);
}
@Override
public void onDescriptorReadRequest(BluetoothDevice device,
int requestId, int offset,
BluetoothGattDescriptor descriptor) {
super.onDescriptorReadRequest(device, requestId,
offset, descriptor);
gattServer.sendResponse(device, requestId, BluetoothGatt.GATT_SUCCESS, offset, characterNotify.getValue());
Log.d("Chris", "onDescriptorReadRequest");
}
@Override
public void onDescriptorWriteRequest(BluetoothDevice device, int requestId,
BluetoothGattDescriptor descriptor, boolean preparedWrite, boolean responseNeeded,
int offset, byte[] value) {
super.onDescriptorWriteRequest(device, requestId, descriptor, preparedWrite, responseNeeded,
offset, value);
gattServer.sendResponse(device, requestId, BluetoothGatt.GATT_SUCCESS, offset, value);
// characterNotify.setValue("HIHHHHH");
// gattServer.notifyCharacteristicChanged(bluetoothDevice, characterNotify, false);
Log.d("Chris", "onDescriptorWriteRequest");
}
@Override
public void onExecuteWrite(BluetoothDevice device,
int requestId, boolean execute) {
super.onExecuteWrite(device, requestId, execute);
Log.d("Chris", "onExecuteWrite");
}
});
gattServer.addService(gattService);
}
/**
*广播的一些基本设置
**/
public AdvertiseSettings createAdvSettings(boolean connectAble, int timeoutMillis) {
AdvertiseSettings.Builder builder = new AdvertiseSettings.Builder();
builder.setAdvertiseMode(AdvertiseSettings.ADVERTISE_MODE_BALANCED);
builder.setConnectable(connectAble);
builder.setTimeout(timeoutMillis);
builder.setTxPowerLevel(AdvertiseSettings.ADVERTISE_TX_POWER_HIGH);
AdvertiseSettings mAdvertiseSettings = builder.build();
if (mAdvertiseSettings == null) {
Toast.makeText(this, "mAdvertiseSettings == null", Toast.LENGTH_LONG).show();
Log.e(TAG, "mAdvertiseSettings == null");
}
return mAdvertiseSettings;
}
@Override
public void onClick(View v) {
if (v == btnNotify) {
characterNotify.setValue("HIHHHHH");
gattServer.notifyCharacteristicChanged(bluetoothDevice, characterNotify, false);
} else if (v == btnStart) {
mBluetoothLeAdvertiser.startAdvertising(createAdvSettings(true, 0), createAdvertiseData(), mAdvertiseCallback);
} else if (v == btnStop) {
stopAdvertise();
}
}
private void stopAdvertise() {
if (mBluetoothLeAdvertiser != null) {
mBluetoothLeAdvertiser.stopAdvertising(mAdvertiseCallback);
}
}
//广播数据
public AdvertiseData createAdvertiseData() {
AdvertiseData.Builder mDataBuilder = new AdvertiseData.Builder();
mDataBuilder.setIncludeDeviceName(true); //广播名称也需要字节长度
mDataBuilder.setIncludeTxPowerLevel(true);
mDataBuilder.addServiceData(ParcelUuid.fromString("0000fff0-0000-1000-8000-00805f9b34fb"),new byte[]{1,2});
AdvertiseData mAdvertiseData = mDataBuilder.build();
if (mAdvertiseData == null) {
Toast.makeText(Main4Activity.this, "mAdvertiseSettings == null", Toast.LENGTH_LONG).show();
Log.e(TAG, "mAdvertiseSettings == null");
}
return mAdvertiseData;
}
private AdvertiseCallback mAdvertiseCallback = new AdvertiseCallback() {
@Override
public void onStartSuccess(AdvertiseSettings settingsInEffect) {
super.onStartSuccess(settingsInEffect);
if (settingsInEffect != null) {
Log.d(TAG, "onStartSuccess TxPowerLv=" + settingsInEffect.getTxPowerLevel() + " mode=" + settingsInEffect.getMode()
+ " timeout=" + settingsInEffect.getTimeout());
} else {
Log.e(TAG, "onStartSuccess, settingInEffect is null");
}
Log.e(TAG, "onStartSuccess settingsInEffect" + settingsInEffect);
}
@Override
public void onStartFailure(int errorCode) {
super.onStartFailure(errorCode);
Log.e(TAG, "onStartFailure errorCode" + errorCode);
if (errorCode == ADVERTISE_FAILED_DATA_TOO_LARGE) {
Toast.makeText(Main4Activity.this, "R.string.advertise_failed_data_too_large", Toast.LENGTH_LONG).show();
Log.e(TAG, "Failed to start advertising as the advertise data to be broadcasted is larger than 31 bytes.");
} else if (errorCode == ADVERTISE_FAILED_TOO_MANY_ADVERTISERS) {
Toast.makeText(Main4Activity.this, "R.string.advertise_failed_too_many_advertises", Toast.LENGTH_LONG).show();
Log.e(TAG, "Failed to start advertising because no advertising instance is available.");
} else if (errorCode == ADVERTISE_FAILED_ALREADY_STARTED) {
Toast.makeText(Main4Activity.this, "R.string.advertise_failed_already_started", Toast.LENGTH_LONG).show();
Log.e(TAG, "Failed to start advertising as the advertising is already started");
} else if (errorCode == ADVERTISE_FAILED_INTERNAL_ERROR) {
Toast.makeText(Main4Activity.this, "R.string.advertise_failed_internal_error", Toast.LENGTH_LONG).show();
Log.e(TAG, "Operation failed due to an internal error");
} else if (errorCode == ADVERTISE_FAILED_FEATURE_UNSUPPORTED) {
Toast.makeText(Main4Activity.this, "R.string.advertise_failed_feature_unsupported", Toast.LENGTH_LONG).show();
Log.e(TAG, "This feature is not supported on this platform");
}
}
};
}
’