NetworkOnMainThreadException
Error "NetworkOnMainThreadException" usually occurs when a network request is in the MainThread class.
Cause:
In Android 3.0 and later versions, the program cannot access the network in the main thread. Network access requests must be placed in separate threads.
Solution:
1. To prevent network access requests from blocking the main thread, place such requests in separate threads or handle them asynchronously with AsyncTask.
2. To avoid this problem, it is recommended that time-consuming network requests be placed in a sub-thread. Then, use the handler to communicate with the main thread.
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