安卓向BLE蓝牙设备写入文本完整详细用例
时间: 2023-08-17 07:31:39 浏览: 36
好的,下面是一个安卓向BLE蓝牙设备写入文本的完整用例:
1. 首先,在你的Android应用中,需要添加BLE蓝牙权限和蓝牙设备扫描权限。
```xml
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
```
2. 在你的Activity中,你需要定义一些变量,例如:
```java
private BluetoothAdapter bluetoothAdapter;
private BluetoothGatt bluetoothGatt;
private BluetoothGattCharacteristic characteristic;
private String deviceAddress = "你的蓝牙设备地址";
private String serviceUUID = "你的蓝牙服务UUID";
private String characteristicUUID = "你的蓝牙特征UUID";
```
3. 接下来,你需要初始化BluetoothAdapter和BluetoothGatt,扫描并连接到蓝牙设备:
```java
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothDevice device = bluetoothAdapter.getRemoteDevice(deviceAddress);
bluetoothGatt = device.connectGatt(this, false, gattCallback);
```
4. 在连接成功后,你需要在BluetoothGattCallback中寻找你的蓝牙服务和特征:
```java
private final BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
super.onConnectionStateChange(gatt, status, newState);
if (newState == BluetoothProfile.STATE_CONNECTED) {
gatt.discoverServices();
} else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
// 断开连接
}
}
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
super.onServicesDiscovered(gatt, status);
if (status == BluetoothGatt.GATT_SUCCESS) {
BluetoothGattService service = gatt.getService(UUID.fromString(serviceUUID));
if (service != null) {
characteristic = service.getCharacteristic(UUID.fromString(characteristicUUID));
}
}
}
};
```
5. 在找到你的特征后,你可以向蓝牙设备写入文本:
```java
String text = "这是要写入的文本";
byte[] value = text.getBytes(Charset.forName("UTF-8"));
characteristic.setValue(value);
bluetoothGatt.writeCharacteristic(characteristic);
```
6. 最后,你需要在BluetoothGattCallback中处理写入结果:
```java
@Override
public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
super.onCharacteristicWrite(gatt, characteristic, status);
if (status == BluetoothGatt.GATT_SUCCESS) {
// 写入成功
} else {
// 写入失败
}
}
```
以上就是安卓向BLE蓝牙设备写入文本的完整用例。