简介

目前，许多项目都会涉及与BLE设备进行交互的功能，接下来说一下读取BLE设备信息的具体实现流程。安卓BLE相关接口介绍详见官网链接：
https://developer.android.google.cn/guide/topics/connectivity/bluetooth-le

轮询方式代码实现

这里实现的示例代码，每60秒通过bluetoothManager查询当前是否有已连接的BLE设备，如果有，则与该设备建立GATT连接，读取设备信息，读完之后断开GATT连接。

package com.komect.gatttest2;import androidx.appcompat.app.AppCompatActivity;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCallback;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattService;
import android.bluetooth.BluetoothManager;
import android.bluetooth.BluetoothProfile;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import java.util.List;
import java.util.UUID;public class MainActivity extends AppCompatActivity {private String TAG = "BLE";private BluetoothGatt mBluetoothGatt;private BluetoothGattCharacteristic mGattCharacteristic;private BluetoothGattService mGattService;private boolean alreadyConnected = false;//service的UUIDpublic static final UUID DEVICE_INFO_SERVICE_UUID = UUID.fromString("0000180A-0000-1000-8000-00805f9b34fb");//characteristic的UUIDpublic static final UUID MANUFACTURER_Name_UUID = UUID.fromString("00002A29-0000-1000-8000-00805f9b34fb");public static final UUID SN_UUID = UUID.fromString("00002A25-0000-1000-8000-00805f9b34fb");public static final UUID MODEL_NAME_UUID = UUID.fromString("00002A24-0000-1000-8000-00805f9b34fb");public static final UUID SOFTWARE_VERSION_UUID = UUID.fromString("00002A27-0000-1000-8000-00805f9b34fb");public static final UUID FIRMWARE_VERSION_UUID = UUID.fromString("00002A26-0000-1000-8000-00805f9b34fb");public static final UUID MAC_UUID = UUID.fromString("00002A23-0000-1000-8000-00805f9b34fb");private final static UUID[] characteristicUUIDList = {MANUFACTURER_Name_UUID,SN_UUID,MODEL_NAME_UUID,SOFTWARE_VERSION_UUID,FIRMWARE_VERSION_UUID};private int index = 0;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);while(true) {if(alreadyConnected == false) {findGattDevice();}try {Thread.sleep(60000);} catch (InterruptedException e) {e.printStackTrace();}}}//GATT连接回调接口BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {@Overridepublic void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {super.onConnectionStateChange(gatt, status, newState);if (newState == BluetoothProfile.STATE_CONNECTED) {//GATT连接成功Log.i(TAG, "GATT connect success");alreadyConnected = true;if(gatt != null) {gatt.discoverServices();}} else if (newState == BluetoothProfile.STATE_DISCONNECTED) {//GATT连接断开Log.i(TAG, "GATT disconnect");closeGatt();}}@Overridepublic void onServicesDiscovered(BluetoothGatt gatt, int status) {super.onServicesDiscovered(gatt, status);Log.i(TAG, "onServicesDiscovered status:" + status);if (status == BluetoothGatt.GATT_SUCCESS) {//根据uuid获取指定的servicemGattService = gatt.getService(DEVICE_INFO_SERVICE_UUID);if (mGattService == null) {Log.i(TAG, "service is null, disconnect GATT");closeGatt();return;} else {Log.i(TAG, "find service!");}//根据uuid获取指定的characteristicmGattCharacteristic = mGattService.getCharacteristic(characteristicUUIDList[0]);if (mGattCharacteristic == null) {Log.i(TAG, "characteristic is null");closeGatt();return;} else {//读取蓝牙特征值Log.i(TAG, "start read characteristic");mBluetoothGatt.readCharacteristic(mGattCharacteristic);}} else {Log.i(TAG, "onServicesDiscovered status false");closeGatt();}}@Overridepublic void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {super.onCharacteristicRead(gatt, characteristic, status);if (status == BluetoothGatt.GATT_SUCCESS) {String value = new String(characteristic.getValue()).trim().replace(" ", "");Log.i(TAG, "read data:" + value);if(mGattService == null) {Log.i(TAG, "service is null, disconnect GATT");closeGatt();return;}index ++;if(index < characteristicUUIDList.length) {mGattCharacteristic = mGattService.getCharacteristic(characteristicUUIDList[index]);} else {closeGatt();return;}if (mGattCharacteristic == null) {Log.i(TAG, "characteristic is null");closeGatt();return;} else {//读取蓝牙特征值Log.i(TAG, "start read characteristic");mBluetoothGatt.readCharacteristic(mGattCharacteristic);}} else {Log.i(TAG, "onCharacteristicRead status false");closeGatt();}}@Overridepublic void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {super.onCharacteristicWrite(gatt, characteristic, status);Log.i(TAG, "onCharacteristicWrite:" + characteristic.getUuid().toString());}};//查找是否有已连接的BLE设备private void findGattDevice() {Log.i(TAG, "findGattDevice start");BluetoothManager bluetoothManager = (BluetoothManager)getSystemService(Context.BLUETOOTH_SERVICE);List<BluetoothDevice> connectedList = bluetoothManager.getConnectedDevices(BluetoothProfile.GATT);if(connectedList == null) {Log.i(TAG, "connectedList is null");return;}int i = 0;Log.i(TAG, "connectedList size:" + connectedList.size());while(connectedList.size() > i) {BluetoothDevice bluetoothDevice = connectedList.get(i);if(bluetoothDevice != null) {Log.i(TAG, "find device:" + bluetoothDevice.getName());try {//建立GATT连接mBluetoothGatt = bluetoothDevice.connectGatt(this, false, mGattCallback);} catch (Exception e) {Log.i(TAG, "findGattDevice e:" + e.getMessage());}}i++;}}//关闭GATT连接private void closeGatt() {Log.i(TAG, "closeGatt start");alreadyConnected = false;mGattService = null;mGattCharacteristic = null;index = 0;if(mBluetoothGatt != null) {Log.i(TAG, "closeGatt do close");try {mBluetoothGatt.disconnect();mBluetoothGatt.close();} catch (Exception e) {Log.i(TAG, "closeGatt e:" + e.getMessage());}mBluetoothGatt = null;}}
}

在AndroidManifest.xml中声明需要用到的权限：

<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

监听广播方式代码实现

todo

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安卓读取蓝牙BLE设备信息

安卓读取蓝牙BLE设备信息

简介

轮询方式代码实现

监听广播方式代码实现

安卓读取蓝牙BLE设备信息相关推荐

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