Android supports hardware play/pause buttons on headsets and attached devices. I am trying to find a way to test support for those devices on an emulator. The Android documentation talks about how to add support for hardware playback controls, but, unfortunately, I can't find documentation of how to emulate them. Thanks!
我使用的解码音频MediaExtractor,MediaCodec和AudioTrack。我配置AudioTrack使用MediaFormat由归国MediaCodec.getOutputFormat()接收后MediaCodec.INFO_OUTPUT_FORMAT_CHANGED从MediaCodec。在某些设备上,这会导致音频加速,而MediaFormat返回的则MediaExtractor正常工作。(在其他设备上,情况正好相反。)
以下是一些细节:
MediaFormat,因为我无法访问这些设备,但我假设它返回单声道的立体声,或 22050 Hz 的 44100 Hz,而不实际重新采样文件。任何帮助,将不胜感激。谢谢!
我试图找出一种优雅的方法来查询 AppEngine 数据存储区中具有特定属性的所有实体。由于缺少属性的实体不包含在索引中,基本上我想要做的是检索给定属性的索引。我确信可以做类似的事情:
Filter bigger = new FilterPredicate(PROPERTY,
FilterOperator.GREATER_THAN_OR_EQUAL,
0);
Filter smaller = new FilterPredicate(PROPERTY,
FilterOperator.LESS_THAN_OR_EQUAL,
0);
Filter present = CompositeFilterOperator.or(bigger, smaller);
Query q = new Query(KIND).setFilter(present);
Run Code Online (Sandbox Code Playgroud)
但它看起来不像是一个非常优雅(或有效)的解决方案。有人有更好的主意吗?