Android MediaPlayer Architecture — Introduction (1)

Source location of Java mediaplayer class: frameworks \ base \ media \ Java \ Android \ media \ mediaplayer.java

Let's first look at its constructor:

When the mediaplayer object is instantiated, a native will be called_ Setup method:

The corresponding native function can be found in the JNI code (frameworks \ base \ media \ JNI \ android_media_mediaplayer. CPP):

In JNI, you can see that SP < mediaplayer > MP = new mediaplayer(), the native mediaplayer, interacts with the media service to realize the real playback function.

Android in JNI function_ media_ MediaPlayer_ native_ In setup, a listener is set for mediaplayer to upload player events to the Java layer through callback so that users can handle them accordingly

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In JNI code, jnimedia playerlistener class is a subclass of mediaplayerlistener, which implements the notify function. Its definition is as follows:

The transfer of callback events is mainly completed through the notify function. Let's take a look at the specific implementation process of this function:

The content of this article is very simple. It mainly has a basic understanding and understanding of how to associate the mediaplayer of Java layer, JNI layer and mediaplayer of native layer.

A brief two-point overview: