Android 蓝牙BluetoothAdapter 相关(一)

Android 蓝牙相关

本文主要讲述android 蓝牙的简单使用.

1: 是否支持蓝牙

/**
 * 是否支持蓝牙
 *
 * @return
 */
private boolean isSupportBluetooth() {
    BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    return bluetoothAdapter != null;
}

2: 开启蓝牙

注意这里需要申请下BLUETOOTH 权限.

/**
 * 开启蓝牙
 */
private void openBluetooth() {
    BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    //RequiresPermission(Manifest.permission.BLUETOOTH)
    if (!bluetoothAdapter.isEnabled()) {
        Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        startActivityForResult(enableBtIntent, 1001);
    }
}

点击跳转后的界面如下:

3: 关闭蓝牙

private void closeBluetooth(){
    BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    if (bluetoothAdapter.isEnabled()) {
        bluetoothAdapter.disable();
    }
}

关闭蓝牙同样会有弹框提示,如下:

4: 扫描蓝牙设备

这里其实分为两部分 发现设备以及查找已配对设备.

首先,我们先讲下发现设备,这里需要调用bluetoothAdapter.startDiscovery(). 该进程是异步的，并返回一个布尔值，指示发现是否已成功启动。发现过程通常涉及大约 12 秒的查询扫描，随后会对发现的每台设备进行页面扫描，以检索其蓝牙名称。

其次我们需要注册相关的broadcast ,来接收扫描的结果.

具体的代码如下:

private final BroadcastReceiver receiver = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (BluetoothDevice.ACTION_FOUND.equals(action)) {
            // Discovery has found a device. Get the BluetoothDevice
            // object and its info from the Intent.
            BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            String deviceName = device.getName();
            String deviceHardwareAddress = device.getAddress(); // MAC address
            Log.d(TAG, "onReceive: deviceName:"+deviceName+"; deviceHardwareAddress:"+deviceHardwareAddress);
        }
    }
};

private void registerBluetoothCast(){
    // Register for broadcasts when a device is discovered.
    //Requires {@link android.Manifest.permission#BLUETOOTH} and
    //{@link android.Manifest.permission#ACCESS_COARSE_LOCATION
    IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
    registerReceiver(receiver, filter);
}

需要注意的是权限上需要注册:

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

//发现设备
Log.d(TAG, "onClick: startDiscovery");
bluetoothAdapter.startDiscovery();

执行后具体的输出如下:

2023-12-12 14:34:33.706 11287-11287/com.test.bluetooth D/bluetoothAdapter: onClick: startDiscovery
2023-12-12 14:34:33.706 11287-11287/com.test.bluetooth D/BluetoothAdapter: startDiscovery(): called by: com.test.bluetooth
2023-12-12 14:34:33.707 11287-11287/com.test.bluetooth D/BluetoothAdapter: 210428169: getState(). Returning ON
2023-12-12 14:34:33.779 11287-11287/com.test.bluetooth D/bluetoothAdapter: onReceive: deviceName:vivo TWS 2; deviceHardwareAddress:CC:xx:xx:xx:xx:92
2023-12-12 14:34:33.780 11287-11287/com.test.bluetooth D/bluetoothAdapter: onReceive: deviceName:null; deviceHardwareAddress:3F:xx:xx:xx:xx:90
2023-12-12 14:34:34.052 11287-11287/com.test.bluetooth D/bluetoothAdapter: onReceive: deviceName:OPPO A95 5G; deviceHardwareAddress:30:xx:xx:xx:xx:9C
2023-12-12 14:34:34.351 11287-11287/com.test.bluetooth D/bluetoothAdapter: onReceive: deviceName: iMac; deviceHardwareAddress:88:xx:xx:xx:xx:BF
2023-12-12 14:34:34.366 11287-11287/com.test.bluetooth D/bluetoothAdapter: onReceive: deviceName:MacBook Pro; deviceHardwareAddress:74:xx:xx:xx:xx:49

获取已配对设备:

    private void getBindDevices(){
        Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();
        if (pairedDevices.size() > 0) {
            // There are paired devices. Get the name and address of each paired device.
            for (BluetoothDevice device : pairedDevices) {
                String deviceName = device.getName();
                String deviceHardwareAddress = device.getAddress(); // MAC address
                Log.d(TAG, "bind: deviceName:"+deviceName+"; deviceHardwareAddress:"+deviceHardwareAddress);
            }
        }else{
            Log.d(TAG, "bind devices 0");
        }
    }

2023-12-12 14:47:21.792 12229-12229/com.test.bluetooth D/BluetoothAdapter: 258056678: getState(). Returning ON
2023-12-12 14:47:21.793 12229-12229/com.test.bluetooth D/bluetoothAdapter: bind: deviceName:夏沫; deviceHardwareAddress:50:xx:xx:xx:xx:5A