集音频属性在SoundPool.Builder类API 21

问题描述

我下面一个Android编程视频系列讲座，这是设计了pre-API 21倍英寸因此它告诉我以下面的方式创建的Soundpool变量

I am following an Android Programming video lecture series which was designed in the pre-API 21 times. Hence it tells me to create a SoundPool variable in the following manner.

SoundPool sp = new SoundPool(5, AudioManager.STREAM_MUSIC, 0);
//SoundPool(int maxStreams, int streamType, int srcQuality)

不过，我想用这个的Soundpool为API 21为好。所以，我这样做：

However, I want to use this SoundPool for API 21 as well. So, I am doing this:

if((android.os.Build.VERSION.SDK_INT) == 21){
    sp21 = new SoundPool.Builder();
    sp21.setMaxStreams(5);
    sp = sp21.build();
}
else{
    sp = new SoundPool(5, AudioManager.STREAM_MUSIC, 0);
}

SP21是生成器的变量键入API 21和SP是的Soundpool 键入

sp21 is a variable of Builder type for API 21 and sp is of SoundPool type.

这工作得非常好与具有21 API并具有API 19.真正的设备我的AVD（有没有用API 21一个真正的设备尝试，但我认为这将很好地工作）。现在，我想设置流类型到 USAGE_MEDIA 中，如果块之前 SP = sp21.build（）; 。所以，I型：

This works very well with my AVD having API 21 and real device having API 19. (Haven't tried with a real device with API 21 but I think it will work well). Now, I want to set the streamType to USAGE_MEDIA in the if-block before sp = sp21.build();. So I type:

sp21.setAudioAttributes(AudioAttributes.USAGE_MEDIA);

但皮棉其标记为红色，并说：

But the Lint marks it in red and says:

在类型的方法setAudioAttributes（AudioAttributes）
  SoundPool.Builder不适用的参数（int）的

我知道，即使我不将它设置为USAGE_MEDIA它将被设置为默认情况下是相同的。但我要求以供将来参考，如果我必须将它设置为别的东西，如：。USAGE_ALARM

I know that even if I do not set it to USAGE_MEDIA it will be set to the same by default. But I am asking for future reference if I have to set it to something else like : USAGE_ALARM.

我该如何操作？

请帮助！

我已经提到，的，的和的。

I have referred to Audio Attributes, SoundPool, SoundPool.builder and AudioManager.

推荐答案

这是AudioAttributes实例通过它的建造者建造，AudioAttributes.Builder。

An AudioAttributes instance is built through its builder, AudioAttributes.Builder.

可以通过以下方式使用它。

You can use it in the following way.

sp21.setAudioAttributes(new AudioAttributes.Builder()
.setUsage(AudioAttributes.USAGE_MEDIA)
.setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
.build());

参考：

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