Question

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.bluetooth.BluetoothAdapter
import android.bluetooth.BluetoothManager
import android.content.Context
import org.jetbrains.anko.toast

class MainActivity : AppCompatActivity() {

    var deviceBluetoothAdapter : BluetoothAdapter? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)


        val bluetoothManager : BluetoothManager = getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager

        val check = packageManager.hasSystemFeature("FEATURE_BLUETOOTH_LE")

        deviceBluetoothAdapter = bluetoothManager.adapter

        if (check) toast("BLE supported") else toast("BLE not supported")

    }

}

我使用的是支持蓝牙低能耗的手机，但我错了吐司 - ＆＃34; BLE不支持＆＃34;。我检查hasSystemFeature的输出是否适用于像Camera这样的其他外围设备，它也会返回false。我做错了什么？

我在Manifest中有适当的配置：

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

    <uses-feature android:name="android.hardware.bluetooth.le" android:required="false"/>

Answer 1

您应该使用：

hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)

https://developer.android.com/reference/android/content/pm/PackageManager.html#FEATURE_BLUETOOTH_LE

另一种检查设备是否支持蓝牙的方法：

val btAdapter = BluetoothAdapter.getDefaultAdapter() 
val btSupported = btAdapter != null

并检查它是否已开启：

val btEnabled: Boolean = btAdapter?.isEnabled ?: false

检查BluetoothLE支持时，hasSystemFeature方法返回错误的值

1 个答案: