如何在基于位置的Android应用程序中降低功耗？

Question

如何减少应用程序的耗电量？我可以用什么代码来实现这个？

Answer 1

在尝试获取位置信息时,有几种不同的方法可以降低功耗.

1. 使用上一个已知位置而不是尝试确定当前位置.

   // Get a Location Manager
   LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
   
   // Try to get the last GPS based location
   Location l = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
   
   // Fall back to cell tower based location if no prior GPS location
   if (l == null) {
       l = lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
   }
   

2. 使用较便宜的位置提供商.您可以直接选择LocationManager.NETWORK_PROVIDER或指定您关注的条件,让Android告诉您使用哪个位置提供商.

   // Select the criteria you care about
   Criteria c = new Criteria();
   c.setAccuracy(Criteria.ACCURACY_COARSE);
   c.setPowerRequirement(Criteria.POWER_LOW);
   
   // Let the system tell you what provider you should use for your criteria
   LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
   String p = lm.getBestProvider(c, true);
   
   // Call other Location Manager functions using the above provider...