如何在Android中为BLE设备设置蜂鸣器
我开发了一款Android应用程序,可以使用BLE设备进行操作,如图所示 该应用程序可以扫描和连接设备,但我不能写正确的特征蜂鸣器标签。我编写此代码就是为了做到这一点:如何在Android中为BLE设备设置蜂鸣器,android,bluetooth-lowenergy,Android,Bluetooth Lowenergy,我开发了一款Android应用程序,可以使用BLE设备进行操作,如图所示 该应用程序可以扫描和连接设备,但我不能写正确的特征蜂鸣器标签。我编写此代码就是为了做到这一点: private static final int ALERT_HIGH = 2; private static final UUID IMMEDIATE_ALERT_UUID = UUID.fromString("00001802-0000-1000-8000-00805f9b34fb"); private static fi
private static final int ALERT_HIGH = 2;
private static final UUID IMMEDIATE_ALERT_UUID = UUID.fromString("00001802-0000-1000-8000-00805f9b34fb");
private static final UUID ALERT_LEVEL_UUID = UUID.fromString("00002a06-0000-1000-8000-00805f9b34fb");
public void ClickButton(View view)
{
BluetoothGattService alertService = mGatt.getService(IMMEDIATE_ALERT_UUID);
if (alertService == null)
{
Toast.makeText(this, "Immediate Alert service not found!", 1)
.show();
return;
}
BluetoothGattCharacteristic alertLevel = alertService.getCharacteristic(ALERT_LEVEL_UUID);
if (alertLevel == null)
{
Toast.makeText(this, "Alert Level charateristic not found!", 1)
.show();
return;
}
alertLevel.setValue(ALERT_HIGH, BluetoothGattCharacteristic.FORMAT_UINT8, 0);
mGatt.writeCharacteristic(alertLevel);
}
但是没有任何行动发生
我在play store上发现了这个应用程序,它运行良好,可以对ble设备进行蜂鸣器操作
我不知道我的代码在哪里丢失了;我不知道我以前使用的函数或与此设备连接的初始化中存在的问题
最后,这是我使用的完整代码
public class MainActivity extends Activity {
private BluetoothAdapter mBluetoothAdapter;
private int REQUEST_ENABLE_BT = 1;
private Handler mHandler;
private static final long SCAN_PERIOD = 1000*60;
private BluetoothLeScanner mLEScanner;
private ScanSettings settings;
private List<ScanFilter> filters;
private BluetoothGatt mGatt;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mHandler = new Handler();
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
Toast.makeText(this, "BLE Not Supported",
Toast.LENGTH_SHORT).show();
finish();
}
final BluetoothManager bluetoothManager =
(BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
mBluetoothAdapter = bluetoothManager.getAdapter();
}
@Override
protected void onResume() {
super.onResume();
if (mBluetoothAdapter == null || !mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
} else {
if (Build.VERSION.SDK_INT >= 21) {
mLEScanner = mBluetoothAdapter.getBluetoothLeScanner();
settings = new ScanSettings.Builder()
.setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
.build();
filters = new ArrayList<ScanFilter>();
}
scanLeDevice(true);
}
}
@Override
protected void onPause() {
super.onPause();
if (mBluetoothAdapter != null && mBluetoothAdapter.isEnabled()) {
scanLeDevice(false);
}
}
@Override
protected void onDestroy() {
if (mGatt == null) {
return;
}
mGatt.close();
mGatt = null;
super.onDestroy();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_ENABLE_BT) {
if (resultCode == Activity.RESULT_CANCELED) {
//Bluetooth not enabled.
finish();
return;
}
}
super.onActivityResult(requestCode, resultCode, data);
}
private void scanLeDevice(final boolean enable) {
if (enable) {
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
if (Build.VERSION.SDK_INT < 21) {
mBluetoothAdapter.stopLeScan(mLeScanCallback);
} else {
mLEScanner.stopScan(mScanCallback);
}
}
}, SCAN_PERIOD);
if (Build.VERSION.SDK_INT < 21) {
mBluetoothAdapter.startLeScan(mLeScanCallback);
} else {
mLEScanner.startScan(filters, settings, mScanCallback);
}
} else {
if (Build.VERSION.SDK_INT < 21) {
mBluetoothAdapter.stopLeScan(mLeScanCallback);
} else {
mLEScanner.stopScan(mScanCallback);
}
}
}
private ScanCallback mScanCallback = new ScanCallback() {
@Override
public void onScanResult(int callbackType, ScanResult result) {
Log.i("callbackType", String.valueOf(callbackType));
Log.i("result", result.toString());
BluetoothDevice btDevice = result.getDevice();
String DeviceAddress = btDevice.getAddress().trim();
if(DeviceAddress.equals("FF:FF:00:01:05:07"))
connectToDevice(btDevice);
}
@Override
public void onBatchScanResults(List<ScanResult> results) {
for (ScanResult sr : results) {
Log.i("ScanResult - Results", sr.toString());
}
}
@Override
public void onScanFailed(int errorCode) {
Log.e("Scan Failed", "Error Code: " + errorCode);
}
};
private BluetoothAdapter.LeScanCallback mLeScanCallback =
new BluetoothAdapter.LeScanCallback() {
@Override
public void onLeScan(final BluetoothDevice device, int rssi,
byte[] scanRecord) {
runOnUiThread(new Runnable() {
@Override
public void run() {
Log.i("onLeScan", device.toString());
connectToDevice(device);
}
});
}
};
String address;
public void connectToDevice(BluetoothDevice device) {
if (mGatt == null) {
address = device.getAddress();
mGatt = device.connectGatt(this, false, gattCallback);
}
}
private final BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
Log.i("onConnectionStateChange", "Status: " + status);
switch (newState) {
case BluetoothProfile.STATE_CONNECTED:
Log.i("gattCallback", "STATE_CONNECTED");
mGatt.discoverServices();
break;
case BluetoothProfile.STATE_DISCONNECTED:
Log.e("gattCallback", "STATE_DISCONNECTED");
break;
default:
Log.e("gattCallback", "STATE_OTHER");
}
}
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
List<BluetoothGattService> services = gatt.getServices();
Log.i("onServicesDiscovered", services.toString());
gatt.readCharacteristic(services.get(1).getCharacteristics().get
(0));
}
@Override
public void onCharacteristicRead(BluetoothGatt gatt,
BluetoothGattCharacteristic
characteristic, int status) {
Log.i("onCharacteristicRead", characteristic.toString());
gatt.disconnect();
}
};
private static final int ALERT_HIGH = 2;
private static final UUID IMMEDIATE_ALERT_UUID = UUID.fromString("00001802-0000-1000-8000-00805f9b34fb");
private static final UUID ALERT_LEVEL_UUID = UUID.fromString("00002a06-0000-1000-8000-00805f9b34fb");
public void ClickButton(View view)
{
BluetoothGattService alertService = mGatt.getService(IMMEDIATE_ALERT_UUID);
if (alertService == null)
{
Toast.makeText(this, "Immediate Alert service not found!", 1)
.show();
return;
}
BluetoothGattCharacteristic alertLevel = alertService.getCharacteristic(ALERT_LEVEL_UUID);
if (alertLevel == null)
{
Toast.makeText(this, "Alert Level charateristic not found!", 1)
.show();
return;
}
alertLevel.setValue(ALERT_HIGH, BluetoothGattCharacteristic.FORMAT_UINT8, 0);
mGatt.writeCharacteristic(alertLevel);
}
}
公共类MainActivity扩展活动{
私人蓝牙适配器mBluetoothAdapter;
私有整数请求\启用\ BT=1;
私人经理人;
专用静态最终长扫描周期=1000*60;
私人蓝牙扫描仪;
私人扫描设置;
私有列表过滤器;
私人蓝牙GATT mGatt;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mHandler=新处理程序();
如果(!getPackageManager().hasSystemFeature(PackageManager.FEATURE\u BLUETOOTH\u LE)){
Toast.makeText(不支持此选项),
吐司。长度(短)。show();
完成();
}
最终BluetoothManager BluetoothManager=
(BluetoothManager)getSystemService(Context.BLUETOOTH\u服务);
mBluetoothAdapter=bluetoothManager.getAdapter();
}
@凌驾
受保护的void onResume(){
super.onResume();
if(mBluetoothAdapter==null | |!mBluetoothAdapter.isEnabled()){
Intent enablebintent=新意图(BluetoothAdapter.ACTION\u REQUEST\u ENABLE);
startActivityForResult(启用BTIntent、请求\启用\ BT);
}否则{
如果(Build.VERSION.SDK_INT>=21){
mLEScanner=mBluetoothAdapter.getBluetoothLeScanner();
设置=新的ScanSettings.Builder()
.setScanMode(扫描设置.SCAN\u模式\u低延迟)
.build();
过滤器=新的ArrayList();
}
扫描设备(真实);
}
}
@凌驾
受保护的void onPause(){
super.onPause();
if(mBluetoothAdapter!=null&&mBluetoothAdapter.isEnabled()){
扫描设备(假);
}
}
@凌驾
受保护的空onDestroy(){
如果(mGatt==null){
返回;
}
mGatt.close();
mGatt=null;
super.ondestory();
}
@凌驾
受保护的void onActivityResult(int请求代码、int结果代码、意图数据){
if(requestCode==请求启用){
if(resultCode==Activity.RESULT\u已取消){
//蓝牙未启用。
完成();
返回;
}
}
super.onActivityResult(请求代码、结果代码、数据);
}
专用void扫描设备(最终布尔启用){
如果(启用){
mHandler.postDelayed(新的Runnable(){
@凌驾
公开募捐{
if(Build.VERSION.SDK_INT<21){
mBluetoothAdapter.stopLeScan(mLeScanCallback);
}否则{
mLEScanner.stopScan(mScanCallback);
}
}
},扫描周期);
if(Build.VERSION.SDK_INT<21){
mBluetoothAdapter.startedscan(mLeScanCallback);
}否则{
mLEScanner.startScan(过滤器、设置、mScanCallback);
}
}否则{
if(Build.VERSION.SDK_INT<21){
mBluetoothAdapter.stopLeScan(mLeScanCallback);
}否则{
mLEScanner.stopScan(mScanCallback);
}
}
}
private ScanCallback mScanCallback=新建ScanCallback(){
@凌驾
公共void onScanResult(int callbackType、ScanResult){
Log.i(“callbackType”,String.valueOf(callbackType));
Log.i(“result”,result.toString());
BluetoothDevice btDevice=result.getDevice();
字符串DeviceAddress=btDevice.getAddress().trim();
如果(设备地址等于(“FF:FF:00:01:05:07”))
连接到设备(BTD设备);
}
@凌驾
public void onBatchScanResults(列出结果){
用于(扫描结果sr:结果){
Log.i(“ScanResult-Results”,sr.toString());
}
}
@凌驾
公共无效OnScan失败(内部错误代码){
Log.e(“扫描失败”,“错误代码:”+错误代码);
}
};
私有BluetoothAdapter.LeScanCallback mLeScanCallback=
新的BluetoothAdapter.LeScanCallback(){
@凌驾
public void onLeScan(最终蓝牙设备,int rssi,
字节[]扫描记录){
runOnUiThread(新的Runnable(){
@凌驾
公开募捐{
Log.i(“onLeScan”,device.toString());
连接到设备(设备);
}
});
}
};
字符串地址;
public void connectToDevice(蓝牙设备){
如果(mGatt==null){
address=device.getAddress();
mGatt=device.connectGatt(this,false,gattCallback);
}
}
私有最终BluetoothGattCallback gattCallback=新BluetoothGattCallback(){
@凌驾
连接状态更改的公共无效(蓝牙gatt gatt、int状态、int新闻状态){
Log.i(“onConnectionStateChange”,“Status:+Status”);
交换机(新闻状态){
案例BluetoothProfile.STATE\u已连接:
Log.i(“gattCallback”、“STATE_CONNECTED”);
mGatt.discoverServices();
打破
案例BluetoothProfile.STATE\u已断开连接:
Log.e(“gattCallback”、“STATE_DISCONNECTED”);
打破
违约:
Log.e(“gattCallback”、“STATE_OTHER”);
}
}
@凌驾
发现服务上的公共无效(Bluetooth gatt,int状态){
List services=gatt.getServices();
Log.i(“OnServicesDiscovery”
byte[] valToWrite = parseHexStringToBytes("0x0" + alertLevel);
immediateAlertChar.setValue(valToWrite);
boolean val = gatt.writeCharacteristic(immediateAlertChar);