Detailed explanation of message passing between Android main thread and child thread
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Android
Send a message from the main thread to the child thread (to be exact, it should be a non UI thread)
When a message is delivered from a non UI thread to a UI thread (the main thread of the interface), because the main interface already has a messagequeue, the message processing message can be obtained directly. When the main thread processes a message to a non UI thread, the non UI thread needs to first add a message queue and then process the message loop.
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