为了在后台检索融合位置，我创建了一个与Commonsguy 创建的cwac-locpoll库非常相似的库。
在 PollerThread 内部，我正在尝试使用LocationClient.
我可以通过在onConnected方法上接收回调来建立连接，但我无法在方法上获得回调。所以onLocationChanged我的onTimeout线程按照确定的间隔执行。
注意： 仅当屏幕灯熄灭时才会出现此问题。否则它会完全正常工作。
我怀疑新的 Location Api 中可能存在错误。
这是我的实现PollerThread，
private class PollerThread extends WakefulThread implements GooglePlayServicesClient.ConnectionCallbacks,
GooglePlayServicesClient.OnConnectionFailedListener,LocationListener{
private static final String TAG = "PollerThread";
//context
private Context mContext=null;
private LocationClient mLocationClient=null;
private LocationRequest mLocationRequest=null;
private LocationManager locMgr=null;
private Intent intentTemplate=null;
private Handler handler=new Handler();
private Runnable onTimeout = new Runnable() {
@Override
public void run() {
Log.e(TAG, "onTimeout");
//prepare broadcast intent
Intent toBroadcast=new Intent(intentTemplate);
toBroadcast.putExtra(FusedPoller.EXTRA_ERROR, "Timeout!");
toBroadcast.putExtra(
FusedPoller.EXTRA_ERROR_PROVIDER_DISABLED, false);
toBroadcast.putExtra(FusedPoller.EXTRA_LASTKNOWN,
mLocationClient.getLastLocation());
sendBroadcast(toBroadcast);
//stop the thread
quit();
}
};
PollerThread(Context mContext,LocationRequest mLocationRequest,PowerManager.WakeLock lock, LocationManager locMgr,
Intent intentTemplate) {
super(lock, "LocationPoller-PollerThread");
Log.e(TAG, "PollerThread");
this.mContext=mContext;
this.mLocationRequest=mLocationRequest;
this.locMgr=locMgr;
this.intentTemplate=intentTemplate;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
Log.e(TAG, "onPreExecute");
//setup timeout
setTimeoutAlarm();
//initiate connection
initiateConnection();
}
@Override
protected void onPostExecute() {
super.onPostExecute();
Log.e(TAG, "onPostExecute");
//remove timeout
removeTimeoutAlarm();
//disconnect
initiateDisconnection();
}
/**
* Called when the WakeLock is completely unlocked.
* Stops the service, so everything shuts down.
*/
@Override
protected void onUnlocked() {
Log.e(TAG, "onUnlocked");
stopSelf();
}
private void setTimeoutAlarm() {
Log.e(TAG, "setTimeoutAlarm");
handler.postDelayed(onTimeout, FusedLocationUtils.DEFAULT_TIMEOUT);
}
private void removeTimeoutAlarm()
{
Log.e(TAG, "removeTimeoutAlarm");
handler.removeCallbacks(onTimeout);
}
private void initiateConnection()
{
Log.e(TAG, "initiateConnection");
mLocationClient = new LocationClient(this.mContext, this, this);
mLocationClient.connect();
}
private void initiateDisconnection()
{
Log.e(TAG, "initiateDisconnection");
if(mLocationClient.isConnected())
{
mLocationClient.disconnect();
}
}
@Override
public void onConnected(Bundle arg0) {
Log.e(TAG, "onConnected");
Log.e(TAG, "provider: GPS-"+locMgr.isProviderEnabled(LocationManager.GPS_PROVIDER)+" NETWORK-"+locMgr.isProviderEnabled(LocationManager.NETWORK_PROVIDER));
if (!(locMgr.isProviderEnabled(LocationManager.GPS_PROVIDER)) && !(locMgr.isProviderEnabled(LocationManager.NETWORK_PROVIDER))) {
Log.e(TAG, "both disabled");
//get last location and broadcast it
getLastLocationAndBroadcast();
//stop the thread
quit();
}
else
{
Log.e(TAG, "provider enabled");
//get latest location and broadcast it
getLatestLocationAndBroadcast();
//don't quit from here,quit from onLocationChanged
}
}
@Override
public void onDisconnected() {
Log.e(TAG, "onDisconnected");
// TODO Auto-generated method stub
}
@Override
public void onConnectionFailed(ConnectionResult arg0) {
Log.e(TAG, "onConnectionFailed");
// TODO Auto-generated method stub
}
@Override
public void onLocationChanged(Location location) {
Log.e(TAG, "onLocationChanged");
//prepare broadcast intent
Intent toBroadcast=new Intent(intentTemplate);
toBroadcast.putExtra(FusedPoller.EXTRA_LOCATION, location);
sendBroadcast(toBroadcast);
//stop further updates
stopUpdates();
//stop the thread
quit();
}
private void getLatestLocationAndBroadcast() {
Log.e(TAG, "getLatestLocationAndBroadcast");
if(mLocationClient.isConnected() && servicesConnected())
{
Log.e(TAG, "going to request updates");
Log.e(TAG, "lockStatic.isHeld(): "+lockStatic.isHeld());
mLocationClient.requestLocationUpdates(mLocationRequest, this);
}
else
{
Log.e(TAG, "not going to request updates");
}
}
private void stopUpdates() {
Log.e(TAG, "stopUpdates");
if(servicesConnected())
{
Log.e(TAG,getString(R.string.location_updates_stopped));
mLocationClient.removeLocationUpdates(this);
}
else
{
Log.e(TAG,"can't do:"+getString(R.string.location_updates_stopped));
}
}
private void getLastLocationAndBroadcast() {
Log.e(TAG, "getLastLocationAndBroadcast");
if(mLocationClient.isConnected() && servicesConnected())
{
Log.e(TAG, "going to get last location: "+mLocationClient.getLastLocation());
Intent toBroadcast = new Intent(intentTemplate);
toBroadcast.putExtra(FusedPoller.EXTRA_ERROR,
"Location Provider disabled!");
toBroadcast.putExtra(
FusedPoller.EXTRA_ERROR_PROVIDER_DISABLED, true);
toBroadcast.putExtra(FusedPoller.EXTRA_LASTKNOWN,
mLocationClient.getLastLocation());
sendBroadcast(toBroadcast);
}
else
{
Log.e(TAG, "not going to get last location");
}
}
}
和servicesConnected方法实现，
/**
* Verify that Google Play services is available before making a request.
*
* @return true if Google Play services is available, otherwise false
*/
private boolean servicesConnected() {
Log.e(TAG, "servicesConnected");
// Check that Google Play services is available
int resultCode =
GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
// If Google Play services is available
if (ConnectionResult.SUCCESS == resultCode) {
// In debug mode, log the status
Log.d(FusedLocationUtils.APPTAG, getString(R.string.play_services_available));
// Continue
return true;
// Google Play services was not available for some reason
} else {
// Display an error dialog
Log.d(FusedLocationUtils.APPTAG, getString(R.string.play_services_unavailable));
Toast.makeText(this, getString(R.string.play_services_unavailable), Toast.LENGTH_SHORT).show();
return false;
}
}