关于降低电池消耗的建议，您可以使用活动检测来确定您需要多久确定一次位置。在这方面，我可以推荐https://github.com/mcharmas/Android-ReactiveLocation，我在活动检测部分做出了贡献。该库还大大减少了获取融合位置所需的编码行数。
该库在此处包含一个简单的使用示例：https://github.com/mcharmas/Android-ReactiveLocation/blob/master/sample/src/main/java/pl/charmas/android/reactivelocation/sample/MainActivity.java
正如您在评论中所写，要找到使用 ActivityDetectionApi 的好例子并不容易。这也是我将其添加到库中的原因之一。事实上，当时 google 提供的文档已经过时，因为他们更新了 Google Play Services API，但没有更新教程。
对于不使用该库的教程，我没有任何好的指导，但我可以使用 ReactiveLocation 提供我的代码的 sn-p。此代码在服务中运行，因此无论应用是否处于焦点，它都会跟踪当前活动：
private void requestFilteredActivityUpdates() {
ReactiveLocationProvider locationProvider = new ReactiveLocationProvider(getApplicationContext());
filteredActivitySubscription = locationProvider.getDetectedActivity(0).doOnError(new Action1<Throwable>() {
@Override
public void call(Throwable throwable) {
String message = "Error on activitySubscription: " + throwable.getMessage();
Log.e(TAG, message, throwable);
Crashlytics.logException(throwable);
}
}).onErrorReturn(new Func1<Throwable, ActivityRecognitionResult>() {
@Override
public ActivityRecognitionResult call(Throwable throwable) {
List<DetectedActivity> list = new ArrayList<DetectedActivity>();
list.add(new DetectedActivity(DetectedActivity.UNKNOWN, 0));
return new ActivityRecognitionResult(list, System.currentTimeMillis(), SystemClock.elapsedRealtime());
}
}).filter(new Func1<ActivityRecognitionResult, Boolean>() {
@Override
public Boolean call(ActivityRecognitionResult activityRecognitionResult) {
DetectedActivity detectedActivity = activityRecognitionResult.getMostProbableActivity();
boolean highConfidence = detectedActivity.getConfidence() > 75;
DetectedActivity previousActivity = ActivityDetectionModule.Recent.getDetectedActivity();
boolean isNewActivity = detectedActivity.getType() != previousActivity.getType();
boolean hasHigherConfidence = detectedActivity.getConfidence() > previousActivity.getConfidence();
return mJustStarted || (highConfidence && (isNewActivity || hasHigherConfidence));
}
}).subscribe(new Action1<ActivityRecognitionResult>() {
@Override
public void call(ActivityRecognitionResult activityRecognitionResult) {
DetectedActivity detectedActivity = activityRecognitionResult.getMostProbableActivity();
Log.i(TAG, "Activity changed or increased in confidence:");
Log.i(TAG, "New: " + ActivityDetectionModule.getNameFromType(detectedActivity.getType()) + " confidence: " + detectedActivity.getConfidence());
}
});
}
我打电话给onDestroy()
public void unsubscribeActivityUpdates() {
unsubscribe(filteredActivitySubscription);
}
private void unsubscribe(Subscription subscription) {
if (subscription != null && !subscription.isUnsubscribed()) {
Log.i(TAG, "Unsubscribe activity updates");
try {
subscription.unsubscribe();
} catch (Exception e) {
e.printStackTrace();
}
subscription = null;
}
}
我希望这足以说明如何使用该库，否则请随时提问。