Question

我是Android应用开发的初学者。我已经尝试过阅读文档但却无处可去（Android {＆＃39}教程中的函数已被弃用，等等......）

是否有一个返回蓝牙设备列表的简单功能？

类似于StartLeScan() - ＆gt; （设备清单）？

谢谢

Answer 1

基本上取决于你所针对的Android版本。因为api在棒棒糖中有所改变（21）。

在您的活动中，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);
}

然后你应该检查你所针对的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中，StartLeScan（）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

我也认为这个问题持续了几个小时我通过搜索官方文件找到了答案你需要知道3类和方法ScanCallback，BluetoothLeScanner，ScanResult
//我的等级很低，我无法发布链接....
您可以在Android开发人员网站上看到，该网页会在右侧显示在API级别21中添加“。

以下是我的代码，修改后的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();
    }
};

我的爷爷：

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'
        }
    }
}

这些代码适用于我的手机，即API 21 希望对你有所帮助。

Answer 4

我一直在玩BLE扫描一段时间，直到我从北欧图书馆得到最简单的解决方案。

在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 { ...});

图书馆完成所有工作。

检测Android中的蓝牙Le设备

4 个答案: