Explain in detail how Android uses @ hide’s API

• Android

Explain in detail how Android uses @ hide's API

I want to modify the code of mediaplaybackservice. Java (/ packages / apps / Music) this morning.

Add audiomanager.stream_ Change music to audiomanager.stream_ TTS。

Discover audiosystem.java (/ frameworks / base. Media / Java / Android / media)

AudioManager.java(/frameworks/base.media/java/android/media)

It's a hidden API. I searched it and found that just delete the comments.

It is found that the compilation fails, and then it is found that the make update API needs to be executed before making. So you can compile it.

After adding the system API or modifying @ hide's API, you need to execute make update API to update the API, and then make.

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