在 Android 中检测蓝牙 Le 设备

Question

我是 android 应用程序开发的初学者。我已经尝试阅读文档，但一无所获（Android 教程中的函数，例如 StartLeScan() 已被弃用，等等...）

是否有一个简单的函数 returns 蓝牙设备列表？

类似于 getDevices() ->（设备列表）？

谢谢

Answer 1

基本上这取决于您的目标 android 版本。因为 api 在 lollipop (21) 中发生了一些变化。

在您的 activity 中，获取蓝牙适配器

BluetoothManager bm = (BluetoothManager)getSystemService(Context.BLUETOOTH_SERVICE)
BluetoothAdapter mBluetoothAdapter = bm.getAdapter();

// Ensures Bluetooth is available on the device and it is enabled. If not, 
// displays a dialog requesting user permission to enable Bluetooth. 
if (mBluetoothAdapter == null || !mBluetoothAdapter.isEnabled()) { 
    Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
    startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}

那么您应该检查您的目标 android 版本

int apiVersion = android.os.Build.VERSION.SDK_INT;
if (apiVersion > android.os.Build.VERSION_CODES.KITKAT){
 BluetoothLeScanner scanner = mBluetoothAdapter.getBluetoothLeScanner();
 // scan for devices
 scanner.startScan(new ScanCallback() {
        @Override
        public void onScanResult(int callbackType, ScanResult result) {
            // get the discovered device as you wish
            // this will trigger each time a new device is found

            BluetoothDevice device = result.getDevice();
        }
    });
} else {
    // targetting kitkat or bellow
    mBluetoothAdapter.startLeScan(new BluetoothAdapter.LeScanCallback() {
        @Override
        public void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord) {
            // get the discovered device as you wish

        }
    });

// rest of your code that will run **before** callback is triggered since it's asynchronous

不要忘记在清单中添加权限

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

Answer 2

如果您使用的 api 级别低于 21，那么您会发现 StartLeScan 已被弃用，在 android lollipop StartLeScan() 中引入了新的扫描设置功能。您可以使用以下代码扫描 BLE 设备。

ScanSettings.Builder scanSettingsBuilder = new ScanSettings.Builder();
scanSettingsBuilder.setScanMode(ScanSettings.SCAN_MODE_LOW_POWER);
scanSettings = scanSettingsBuilder.build();

BluetoothScanCallback mScanCallback = new BluetoothScanCallback();
mBluetoothUtils.getBluetoothAdapter().getBluetoothLeScanner()
                .startScan(scanFilters, scanSettings, mScanCallback);

Answer 3

这个问题我也想了几个小时我通过搜索官方文档找到了答案。
你需要知道 3 class 和方法 ScanCallback,BluetoothLeScanner,ScanResult
//我的水平太低了，我不能post link.....
你可以在android developer web中看到，网页会在右侧显示Added in API level 21"。

这是我的代码，已修改 from these project

//declare    
private BluetoothLeScanner mBluetoothLeScanner;  
mBluetoothLeScanner = mBluetoothAdapter.getBluetoothLeScanner();

//start and stop scan
mBluetoothLeScanner.startScan(mScanCallback);
mBluetoothLeScanner.stopScan(mScanCallback);

//Scan call back function
private ScanCallback mScanCallback = new ScanCallback() {
    @Override
    public void onScanResult(int callbackType, ScanResult result) {
         super.onScanResult(callbackType, result);
         mLeDeviceListAdapter.addDevice(result.getDevice());
         mLeDeviceListAdapter.notifyDataSetChanged();
    }
};

我爷爷：

android {
    compileSdkVersion 22
    buildToolsVersion "22.0.1"

    defaultConfig {
        applicationId "com.polkapolka.bluetooth.le"
        minSdkVersion 21
        targetSdkVersion 22
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
    }
}

这些代码在我的 phone 上运行良好，即 API 21 希望对你有帮助。

Answer 4

我一直在玩 BLE 扫描，直到我从 Nordic 库中得到最简单的解决方案。

在您的 build.gradle 中添加一行：

dependencies {
  ....
  compile 'no.nordicsemi.android.support.v18:scanner:1.0.0'
}

并使用 BluetoothLeScannerCompat：

import no.nordicsemi.android.support.v18.scanner.BluetoothLeScannerCompat;

...
BluetoothLeScannerCompat scanner = BluetoothLeScannerCompat.getScanner();
scaner.startScan(new ScanCallback { ...});

图书馆包办所有工作。

在 Android 中检测蓝牙 Le 设备

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