【发布时间】：2014-02-12 03:23:15
【问题描述】：
我有一个每 30 秒返回当前位置的服务，我的问题是该服务消耗了大约 40% 的电池。 GPS 图标始终处于活动状态，即使我增加了时间间隔。我在 Nexus 4 android 4.4.2 上看到了这个问题。一旦回调 OnLocationChanged 被调用，GPS 就会一直处于唤醒状态，这会消耗整个电池。使用我的其他手机 Nexus One android 2.2.3 时，我看不到这个问题，GPS 每 30 秒打开一次然后关闭。而且我没有电池确认。该服务使用位置请求，带有 .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)，但使用 GPS 和网络除外，情况并非如此。我认为android 4.4.2 有问题或者是Google play 服务
这是我的服务代码：
public class MyServiceGpsDebug extends Service implements
GooglePlayServicesClient.ConnectionCallbacks,
GooglePlayServicesClient.OnConnectionFailedListener,LocationListener
{
IBinder mBinder = new LocalBinder();
private LocationClient mLocationClient;
private LocationRequest mLocationRequest;
// Flag that indicates if a request is underway.
private boolean mInProgress;
private Boolean servicesAvailable = false;
public class LocalBinder extends Binder
{
public MyServiceGpsDebug getServerInstance()
{
return MyServiceGpsDebug.this;
}
}
@Override
public void onCreate()
{
super.onCreate();
mInProgress = false;
// Create the LocationRequest object
mLocationRequest = LocationRequest.create();
// Use high accuracy
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
// Set the update interval to 5 seconds
mLocationRequest.setInterval(Constants.UPDATE_INTERVAL);
// Set the fastest update interval to 1 second
mLocationRequest.setFastestInterval(Constants.FASTEST_INTERVAL);
servicesAvailable = servicesConnected();
mLocationClient = new LocationClient(this, this, this);
}
private boolean servicesConnected()
{
// Check that Google Play services is available
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
// If Google Play services is available
if (ConnectionResult.SUCCESS == resultCode)
{
return true;
}
else
{
return false;
}
}
public int onStartCommand (Intent intent, int flags, int startId)
{
super.onStartCommand(intent, flags, startId);
if(!servicesAvailable || mLocationClient.isConnected() || mInProgress)
return START_STICKY;
setUpLocationClientIfNeeded();
if(!mLocationClient.isConnected() || !mLocationClient.isConnecting() && !mInProgress)
{
appendLog(DateFormat.getDateTimeInstance().format(new Date()) + ": Started", Constants.LOG_FILE);
mInProgress = true;
mLocationClient.connect();
}
return START_STICKY;
}
private void setUpLocationClientIfNeeded()
{
if(mLocationClient == null)
mLocationClient = new LocationClient(this, this, this);
}
@Override
public void onLocationChanged(Location location)
{
// Report to the UI that the location was updated
String msg = Double.toString(location.getLatitude()) + "," + Double.toString(location.getLongitude());
Log.d("debug", msg);
// Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
appendLog(msg, Constants.LOCATION_FILE);
}
@Override
public IBinder onBind(Intent intent)
{
return mBinder;
}
public String getTime()
{
SimpleDateFormat mDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return mDateFormat.format(new Date());
}
public void appendLog(String text, String filename)
{
File logFile = new File(filename);
if (!logFile.exists())
{
try
{
logFile.createNewFile();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
try
{
//BufferedWriter for performance, true to set append to file flag
BufferedWriter buf = new BufferedWriter(new FileWriter(logFile, true));
buf.append(text);
buf.newLine();
buf.close();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void onDestroy()
{
// Turn off the request flag
mInProgress = false;
if(servicesAvailable && mLocationClient != null)
{
mLocationClient.removeLocationUpdates(this);
// Destroy the current location client
mLocationClient = null;
}
// Display the connection status
// Toast.makeText(this, DateFormat.getDateTimeInstance().format(new Date()) + ": Disconnected. Please re-connect.", Toast.LENGTH_SHORT).show();
appendLog(DateFormat.getDateTimeInstance().format(new Date()) + ": Stopped", Constants.LOG_FILE);
super.onDestroy();
}
@Override
public void onConnected(Bundle bundle)
{
// Request location updates using static settings
mLocationClient.requestLocationUpdates(mLocationRequest, this);
appendLog(DateFormat.getDateTimeInstance().format(new Date()) + ": Connected", Constants.LOG_FILE);
}
@Override
public void onDisconnected()
{
// Turn off the request flag
mInProgress = false;
// Destroy the current location client
mLocationClient = null;
// Display the connection status
// Toast.makeText(this, DateFormat.getDateTimeInstance().format(new Date()) + ": Disconnected. Please re-connect.", Toast.LENGTH_SHORT).show();
appendLog(DateFormat.getDateTimeInstance().format(new Date()) + ": Disconnected", Constants.LOG_FILE);
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult)
{
mInProgress = false;
if (connectionResult.hasResolution())
{
// If no resolution is available, display an error dialog
} else {
}
}
public final class Constants
{
// Milliseconds per second
private static final int MILLISECONDS_PER_SECOND = 1000;
// Update frequency in seconds
private static final int UPDATE_INTERVAL_IN_SECONDS = 60;
// Update frequency in milliseconds
public static final long UPDATE_INTERVAL = MILLISECONDS_PER_SECOND * UPDATE_INTERVAL_IN_SECONDS;
// The fastest update frequency, in seconds
private static final int FASTEST_INTERVAL_IN_SECONDS = 60;
// A fast frequency ceiling in milliseconds
public static final long FASTEST_INTERVAL = MILLISECONDS_PER_SECOND * FASTEST_INTERVAL_IN_SECONDS;
// Stores the lat / long pairs in a text file
public static final String LOCATION_FILE = "sdcard/location.txt";
// Stores the connect / disconnect data in a text file
public static final String LOG_FILE = "sdcard/log.txt";
/**
* Suppress default constructor for noninstantiability
*/
private Constants() {
throw new AssertionError();
}
}
}
【问题讨论】：
标签： gps android-location