android - 哪个是更高的准确度标准 : ACCURACY_HIGH or ACCURACY_FINE?

Question

在 Criteria 类中，有两个常量，ACCURACY_HIGH 和 ACCURACY_FINE，显然是用来要求 LocationManager 以返回更准确的位置更新。这是documentation关于这些常量中的每一个:

public static final int ACCURACY_FINE (Added in API level 1)

  A constant indicating a finer location accuracy requirement
  Constant Value: 1 (0x00000001)

public static final int ACCURACY_HIGH (Added in API level 9)

  a constant indicating a high accuracy requirement - may be used for horizontal, altitude, speed or bearing accuracy. For horizontal and vertical position this corresponds roughly to an accuracy of less than 100 meters.
  Constant Value: 3 (0x00000003) 

有谁知道这两个常量中哪一个提供(即要求)最高级别的准确度？

Answer 1

根据我在源代码中看到的内容，ACCURACY_FINE 与 ACCURACY_COARSE 分组，分别具有常量值 1 和 2。 ACCURACY_LOW、MEDIUM 和 HIGH 与常量值 1、2 和 3 组合在一起。

似乎 setAccuracy 期望并返回 COARSE 或 FINE，而 setVerticalAccuracy、setHorizo​​ntalAccuracy、setSpeedAccuracy 和 setBearingAccuracy 期望 LOW、MEDIUM 或 HIGH。此外，当您调用 setAccuracy 时，它会像这样设置水平精度:

public void setAccuracy(int accuracy) {
    if (accuracy < NO_REQUIREMENT || accuracy > ACCURACY_COARSE) {
        throw new IllegalArgumentException("accuracy=" + accuracy);
    }
    if (accuracy == ACCURACY_FINE) {
        mHorizontalAccuracy = ACCURACY_HIGH;
    } else {
        mHorizontalAccuracy = ACCURACY_LOW;
    }
}

这真的很令人困惑，但我希望我能为您澄清一下。这是 grepcode 中来源的链接，如果本地没有源，可以自己下载看看。