Solution to the problem of null pointer exception when using networkinfo to judge the network state in Android

In Android, many people will use the following methods to judge whether the current network is available:

However, if there is an exception record, you may see the following exception information:

Many people don't understand why the null pointer exception still occurs when they have clearly judged whether it is null? This kind of abnormality often occurs when the network state is extremely unstable. Let's look at the correct writing first:

As for why it should be written like this, the code comments have made it very clear. If you don't understand it, you can take a look at the knowledge of interprocess communication (IPC) and paceable.

The above is the solution to the problem of null pointer exception when using networkinfo to judge the network status in Android. I hope it will be helpful to you. If you have any questions, please leave me a message and Xiaobian will reply to you in time. Thank you very much for your support for the programming tips website!