my.closeBluetoothAdapter

2023-03-28 12:11

Use this API to close the Bluetooth module in the mini program. You can call the following mini program API and receive event callbacks that are related to the Bluetooth module in the effective period when you the API my.openBluetoothAdapter is called. The effective period is ended when the API my.closeBluetoothAdapter is called.

Instructions :

Call this API to disconnect all the established Bluetooth connections and releases system resources.

It's recommend to call this API after you end the Bluetooth process of the Mini Program, which is in pair with the API my.openBluetoothAdapter.

Calling the API my.closeBluetoothAdapteris asynchronous to releasing resources. It's recommend to call the API my.closeBluetoothAdapter and my.openBluetoothAdapter as part of the exception handling process. Synchronization errors might error if you reinitialize the process.

Note:
Currently simulation in IDE is not supported. Please debug in the production environment.

Code Sample

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/* .acss */
.help-info {
  padding:10px;
  color:#000000;
}
.help-title {
  padding:10px;
  color:#FC0D1B;
}

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// .json
{
    "defaultTitle": "Bluetooth"
}

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<!-- .axml-->
<view class="page">
  <view class="page-description">Bluetooth API</view>
  <view class="page-section">
    <view class="page-section-title">The Bluetooth state</view>
    <view class="page-section-demo">
       <button type="primary" onTap="openBluetoothAdapter">Initialize Bluetooth</button>
       <button type="primary" onTap="closeBluetoothAdapter">Close Bluetooth</button>
       <button type="primary" onTap="getBluetoothAdapterState">Obtain Bluetooth state</button>
    </view>
    <view class="page-section-title">Scan the Bluetooth device</view>
    <view class="page-section-demo">
       <button type="primary" onTap="startBluetoothDevicesDiscovery">Start searching</button>
       <button type="primary" onTap="getBluetoothDevices">All devices found</button>
       <button type="primary" onTap="getConnectedBluetoothDevices">All devices connected</button>
       <button type="primary" onTap="stopBluetoothDevicesDiscovery">Stop searching</button>
    </view>
    <view class="page-section-title">Connect the device</view>
    <view class="page-section-demo">
       <input class="input" onInput="bindKeyInput" type="{{text}}" placeholder="Enter the device ID of the device to connect"></input>
       <button type="primary" onTap="connectBLEDevice">Connect the device</button>
       <button type="primary" onTap="getBLEDeviceServices">Obtain device services</button>
       <button type="primary" onTap="getBLEDeviceCharacteristics">Obtain read and write characteristics</button>
       <button type="primary" onTap="disconnectBLEDevice">Disconnect the device</button>
    </view>
     <view class="page-section-title">Read and write data</view>
     <view class="page-section-demo">
       <button type="primary" onTap="notifyBLECharacteristicValueChange">Listens to the characteristic data change</button>
       <button type="primary" onTap="readBLECharacteristicValue">Read data</button>
       <button type="primary" onTap="writeBLECharacteristicValue">Write data</button>
       <button type="primary" onTap="offBLECharacteristicValueChange">Unlistens to characteristic value</button>
    </view>
     <view class="page-section-title">Other events</view>
     <view class="page-section-demo">
       <button type="primary" onTap="bluetoothAdapterStateChange">Changes of the Bluetooth state</button>
       <button type="primary" onTap="offBluetoothAdapterStateChange">Unlistens to Bluetooth state</button>
       <button type="primary" onTap="BLEConnectionStateChanged">Changes of Bluetooth connection state</button>
       <button type="primary" onTap="offBLEConnectionStateChanged">Unlistens to Bluetooth connection state</button>
       
    </view>
  </view>
</view>

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// .js
Page({
  data: {
    devid: '0D9C82AD-1CC0-414D-9526-119E08D28124',
    serid: 'FEE7',
    notifyId: '36F6',
    writeId: '36F5',
    charid: '',
    alldev: [{ deviceId: '' }],
  },

  //Obtain the Bluetooth state
  openBluetoothAdapter() {
    my.openBluetoothAdapter({
      success: res => {
        if (!res.isSupportBLE) {
          my.alert({ content: 'Sorry, your mobile Bluetooth is unavailable temporarily' });
          return;
        }
        my.alert({ content: 'Succeeded to initialize!' });
      },
      fail: error => {
        my.alert({ content: JSON.stringify(error) });
      },
    });
  },
  closeBluetoothAdapter() {
    my.closeBluetoothAdapter({
      success: () => {
        my.alert({ content: 'Bluetooth closed!' });
      },
      fail: error => {
        my.alert({ content: JSON.stringify(error) });
      },
    });
  },
  getBluetoothAdapterState() {
    my.getBluetoothAdapterState({
      success: res => {
        if (!res.available) {
          my.alert({ content: 'Sorry, your mobile Bluetooth is unavailable temporarily' });
          return;
        }
        my.alert({ content: JSON.stringify(res) });
      },
      fail: error => {
        my.alert({ content: JSON.stringify(error) });
      },
    });
  },

  //Scan the Bluetooth device
  startBluetoothDevicesDiscovery() {
    my.startBluetoothDevicesDiscovery({
      allowDuplicatesKey: false,
      success: () => {
        my.onBluetoothDeviceFound({
          success: res => {
            // my.alert({content:'Listens to new device'+JSON.stringify(res)});
            var deviceArray = res.devices;
            for (var i = deviceArray.length - 1; i >= 0; i--) {
              var deviceObj = deviceArray[i];
              //Pair the target device with the device name or broadcast data, and then record the device ID for later use.
              if (deviceObj.name == this.data.name) {
                my.alert({ content: 'Target device is found' });
                my.offBluetoothDeviceFound();
                this.setData({
                  deviceId: deviceObj.deviceId,
                });
                break;
              }
            }
          },
          fail: error => {
            my.alert({ content: 'Failed to listen to new device' + JSON.stringify(error) });
          },
        });
      },
      fail: error => {
        my.alert({ content: 'Failed to start scanning' + JSON.stringify(error) });
      },
    });
  },

  //Stop scanning
  stopBluetoothDevicesDiscovery() {
    my.stopBluetoothDevicesDiscovery({
      success: res => {
        my.offBluetoothDeviceFound();
        my.alert({ content: 'Succeeded!' });
      },
      fail: error => {
        my.alert({ content: JSON.stringify(error) });
      },
    });
  },

  //Obtain the connected device
  getConnectedBluetoothDevices() {
    my.getConnectedBluetoothDevices({
      success: res => {
        if (res.devices.length === 0) {
          my.alert({ content: 'No connecting devices!' });
          return;
        }
        my.alert({ content: JSON.stringify(res) });
        devid = res.devices[0].deviceId;
      },
      fail: error => {
        my.alert({ content: JSON.stringify(error) });
      },
    });
  },

  //Obtain all searched devices
  getBluetoothDevices() {
    my.getBluetoothDevices({
      success: res => {
        my.alert({ content: JSON.stringify(res) });
      },
      fail: error => {
        my.alert({ content: JSON.stringify(error) });
      },
    });
  },
  bindKeyInput(e) {
    this.setData({
      devid: e.detail.value,
    });
  },

  //Connect the device
  connectBLEDevice() {
    my.connectBLEDevice({
      deviceId: this.data.devid,
      success: res => {
        my.alert({ content: 'Succeeded to connect!' });
      },
      fail: error => {
        my.alert({ content: JSON.stringify(error) });
      },
    });
  },

  //Disconnect the device
  disconnectBLEDevice() {
    my.disconnectBLEDevice({
      deviceId: this.data.devid,
      success: () => {
        my.alert({ content: 'Succeeded to disconnect!' });
      },
      fail: error => {
        my.alert({ content: JSON.stringify(error) });
      },
    });
  },

  //Obtain the services of the connected device
  getBLEDeviceServices() {
    my.getConnectedBluetoothDevices({
      success: res => {
        if (res.devices.length === 0) {
          my.alert({ content: 'No connected devices' });
          return;
        }
        my.getBLEDeviceServices({
          deviceId: this.data.devid,
          success: res => {
            my.alert({ content: JSON.stringify(res) });
            this.setData({
              serid: res.services[0].serviceId,
            });
          },
          fail: error => {
            my.alert({ content: JSON.stringify(error) });
          },
        });
      },
    });
  },

  //Obtain the char ID of the connected device, read and write characteristics are respectively screened out.
  getBLEDeviceCharacteristics() {
    my.getConnectedBluetoothDevices({
      success: res => {
        if (res.devices.length === 0) {
          my.alert({ content: 'No connected devices' });
          return;
        }
        this.setData({
          devid: res.devices[0].deviceId,
        });
        my.getBLEDeviceCharacteristics({
          deviceId: this.data.devid,
          serviceId: this.data.serid,
          success: res => {
            my.alert({ content: JSON.stringify(res) });
            //See the related document for more information of the properties of the characteristics. Pair the characteristics according to the properties and record the value for later use.
            this.setData({
              charid: res.characteristics[0].characteristicId,
            });
          },
          fail: error => {
            my.alert({ content: JSON.stringify(error) });
          },
        });
      },
    });
  },

  //Read and write data
  readBLECharacteristicValue() {
    my.getConnectedBluetoothDevices({
      success: res => {
        if (res.devices.length === 0) {
          my.alert({ content: 'No connected devices' });
          return;
        }
        this.setData({
          devid: res.devices[0].deviceId,
        });
        my.readBLECharacteristicValue({
          deviceId: this.data.devid,
          serviceId: this.data.serid,
          characteristicId: this.data.notifyId,
          //1、Android reading service
          // serviceId:'0000180d-0000-1000-8000-00805f9b34fb',
          // characteristicId:'00002a38-0000-1000-8000-00805f9b34fb',
          success: res => {
            my.alert({ content: JSON.stringify(res) });
          },
          fail: error => {
            my.alert({ content: 'Failed to read' + JSON.stringify(error) });
          },
        });
      },
    });
  },
  writeBLECharacteristicValue() {
    my.getConnectedBluetoothDevices({
      success: res => {
        if (res.devices.length === 0) {
          my.alert({ content: 'No connected devices' });
          return;
        }
        this.setData({
          devid: res.devices[0].deviceId,
        });
        my.writeBLECharacteristicValue({
          deviceId: this.data.devid,
          serviceId: this.data.serid,
          characteristicId: this.data.charid,
          //Android writing service
          //serviceId:'0000180d-0000-1000-8000-00805f9b34fb',
          //characteristicId:'00002a39-0000-1000-8000-00805f9b34fb',
          value: 'ABCD',
          success: res => {
            my.alert({ content: 'Succeeded to write data!' });
          },
          fail: error => {
            my.alert({ content: JSON.stringify(error) });
          },
        });
      },
    });
  },
  notifyBLECharacteristicValueChange() {
    my.getConnectedBluetoothDevices({
      success: res => {
        if (res.devices.length === 0) {
          my.alert({ content: 'No connected devices' });
          return;
        }
        this.setData({
          devid: res.devices[0].deviceId,
        });
        my.notifyBLECharacteristicValueChange({
          state: true,
          deviceId: this.data.devid,
          serviceId: this.data.serid,
          characteristicId: this.data.notifyId,
          success: () => {
            //Listens to characteristic change events 
            my.onBLECharacteristicValueChange({
              success: res => {
                //  my.alert({content: 'Changes of characteristics：'+JSON.stringify(res)});
                my.alert({ content: 'Obtain the response data = ' + res.value });
              },
            });
            my.alert({ content: 'Succeeded to listen' });
          },
          fail: error => {
            my.alert({ content: 'Failed to listen' + JSON.stringify(error) });
          },
        });
      },
    });
  },
  offBLECharacteristicValueChange() {
    my.offBLECharacteristicValueChange();
  },

  //Other events
  bluetoothAdapterStateChange() {
    my.onBluetoothAdapterStateChange(this.getBind('onBluetoothAdapterStateChange'));
  },
  onBluetoothAdapterStateChange() {
    if (res.error) {
      my.alert({ content: JSON.stringify(error) });
    } else {
      my.alert({ content: 'Changes of the Bluetooth state：' + JSON.stringify(res) });
    }
  },
  offBluetoothAdapterStateChange() {
    my.offBluetoothAdapterStateChange(this.getBind('onBluetoothAdapterStateChange'));
  },
  getBind(name) {
    if (!this[`bind${name}`]) {
      this[`bind${name}`] = this[name].bind(this);
    }
    return this[`bind${name}`];
  },
  BLEConnectionStateChanged() {
    my.onBLEConnectionStateChanged(this.getBind('onBLEConnectionStateChanged'));
  },
  onBLEConnectionStateChanged(res) {
    if (res.error) {
      my.alert({ content: JSON.stringify(error) });
    } else {
      my.alert({ content: 'Changes of connection state：' + JSON.stringify(res) });
    }
  },
  offBLEConnectionStateChanged() {
    my.offBLEConnectionStateChanged(this.getBind('onBLEConnectionStateChanged'));
  },
  onUnload() {
    this.offBLEConnectionStateChanged();
    this.offBLECharacteristicValueChange();
    this.offBluetoothAdapterStateChange();
    this.closeBluetoothAdapter();
  },
});

Parameters

The input parameters are displayed in the following table:

Property	Type	Required	Description
success	Function	No	The callback function for a successful API call.
fail	Function	No	The callback function for a failed API call.
complete	Function	No	The callback function for a completed API call (Regardless of whether the call is successful or not).