android-Media Playback

最新推荐文章于 2024-06-16 16:34:16 发布

翻译最新推荐文章于 2024-06-16 16:34:16 发布 · 564 阅读

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本文介绍了Android多媒体框架的主要特性，包括音频回放限制、保持屏幕常亮所需的权限设置、避免阻塞UI线程的方法以及MediaPlayer的状态转换流程。文章还强调了在使用MediaPlayer时需要注意的一些关键点。

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Android多媒体框架（multimedia framework）

> Note: You can play back the audio data only to the standard output device. Currently, that is the mobile device speaker or a Bluetooth headset. You cannot play sound files in the conversation audio during a call.

Wake Lock Permission - If your player application needs to keep the screen from dimming or the processor from sleeping, or uses the MediaPlayer.setScreenOnWhilePlaying() or MediaPlayer.setWakeMode()methods, you must request this permission.

> To avoid hanging your UI thread, spawn another thread to prepare the MediaPlayer and notify the main thread when done.

Another aspect of a MediaPlayer that you should keep in mind is that it's state-based.

> At that point, as the diagram illustrates, you can move between the Started, Paused andPlaybackCompleted states by calling such methods as start(), pause(), and seekTo(), amongst others. When you call stop(), however, notice that you cannot call start() again until you prepare the MediaPlayeragain.