getBluetoothLeAdvertiser()返回null | getBluetoothLeAdvertiser

本文介绍了getBluetoothLeAdvertiser()返回null的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

BluetoothLeAdvertiser advertiser = BluetoothAdapter.getDefaultAdapter().getBluetoothLeAdvertiser();

这将返回null.我在API 21和API 23设备上进行了尝试，但结果相同.我不知道我在想什么?

This returns null. I have tried on an API 21 and on an API 23 device, but with the same result. I have no idea what I am missing?

该应用程序的构建和运行正常，直到使用广告客户并且该应用程序崩溃为止.

The app builds and runs just fine, until of course the advertiser is used and the app crashes.

感谢您提供的任何帮助！ :)

I appreciate any help provided! :)

推荐答案

如果您检查了开发人员文档，请链接此处.您会看到在以下情况下返回了空对象:

If you check the developer docs, link here.You'll see that the null object is returned in the following case:

如果不确定设备是否完全支持蓝牙，则应检查系统返回的BluetoothAdapter是否为null

If you are unsure whether the device supports Bluetooth at all you should check if the BluetoothAdapter returned by the system is null

BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
    // Device does not support Bluetooth
}

然后他们建议您致电isMultipleAdvertisementSupported()，看看是否首先受支持.

Then they advice you to call isMultipleAdvertisementSupported() to see if it is supported first.

if(!mBluetoothAdapter.isMultipleAdvertisementSupported()){
    //Device does not support Bluetooth LE
}

如果它支持BLE，则必须检查以查看是否启用了蓝牙，如果没有启用，请使用户了解并解决.

If it supports BLE you must check to see if Bluetooth is enabled and if not, make the user aware and resolve it.

if (!mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
    startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}

大多数情况下，适配器是null

That should cover most of the times the adapter is null

这篇关于getBluetoothLeAdvertiser()返回null的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！