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我已经使用Google Maps Api V2在Android中编写了一个应用程序。该应用程序基本上运行一个服务，并将地点报告给使用SupportMapFragment添加Google地图的活动。一旦应用程序重新启动，Google Map API v2不会更新地图
当我启动应用程序时，一切似乎工作正常，地图更新。问题是当我按下按钮或屏幕关闭并返回到应用程序谷歌地图停止工作。该位置仍然报告，我调用Map对象上的moveCamera方法。
public class GpsTracker extends android.support.v4.app.FragmentActivity {
public static final int GPS_LOCATION_UPDATE = 0;
public static final int NETWORK_LOCATION_UPDATE = 1;
public static final int LOCATION_NETWORK_UNAVAILABLE = 2;
public static final int LOCATION_GPS_UNAVAILABLE = 3;
private static String gpsTrackerTag = "GpsTracker:MainActivity";
private GoogleMap mMap;
private PolylineOptions mpolyOptions = new PolylineOptions();
GpsTrackerMyService myservice = null;
ServiceConnection sc = null;
static MyHandlerCallback myCallback = null;
//private Boolean mServiceRunning = false; // Initial State When service is yet not started.
private Boolean mServiceBinded = false;
public static Callback CallBackHandler()
{
return myCallback;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gps_tracker);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
if (savedInstanceState == null) {
// First incarnation of this activity.
mapFragment.setRetainInstance(true);
} else {
// Reincarnated activity. The obtained map is the same map instance in the previous
// activity life cycle. There is no need to reinitialize it.
mMap = mapFragment.getMap();
}
InitializeActivity();
setUpMapIfNeeded();
}
@Override
protected void onPause()
{
super.onPause();
if(mServiceBinded)
{
unbindService(sc);
mServiceBinded = false;
Log.d(gpsTrackerTag, "onPause(): Unbinded from the Serivce");
}
else
Log.d(gpsTrackerTag, "onPause(): Service Already in not Bind State");
}
@Override
protected void onResume()
{
super.onResume();
if(GpsTrackerMyService.isInstanceCreated() == true)
{
bindService(new Intent(this, GpsTrackerMyService.class), sc, 0);
mServiceBinded = true;
Log.d(gpsTrackerTag, "onResume(): Binded to the Service");
}
else
Log.d(gpsTrackerTag, "onResume(): Service Not Running");
setUpMapIfNeeded();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_gps_tracker, menu);
return true;
}
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
private void setUpMap() {
// mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker"));
}
private void InitializeActivity() {
if(myCallback == null)
myCallback = new MyHandlerCallback();
if(sc == null){
sc = new ServiceConnection() {
@Override
public void onServiceDisconnected(ComponentName name) {
mServiceBinded = false;
CharSequence text = "Service DisConnected";
Toast t = Toast.makeText(getApplicationContext(), text, Toast.LENGTH_LONG);
t.show();
Log.d(gpsTrackerTag, "Service Disconnected ");
}
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
myservice = ((MyBinder) service).getService();
mServiceBinded = true;
Log.d(gpsTrackerTag, "Service Connected ");
}
};
}
}
public void startButton_Click(View view)
{
if(GpsTrackerMyService.isInstanceCreated() == false)
{
Intent serviceIntent = startService();
bindService(serviceIntent);
Log.d(gpsTrackerTag, "startButton_Click(): Service Started and Called for bind");
}
else
Log.d(gpsTrackerTag, "startButton_Click(): Service Already Running");
}
private void bindService(Intent serviceIntent) {
bindService(serviceIntent, sc, 0);
}
private Intent startService() {
Intent serviceIntent = new Intent(this, GpsTrackerMyService.class);
startService(serviceIntent);
return serviceIntent;
}
public void stopButton_Click(View view)
{
stopService();
}
private void stopService() {
if(GpsTrackerMyService.isInstanceCreated() == true)
{
Log.d(gpsTrackerTag, "stopService(): Service Running Calling Stop on the Service");
myservice.stopSelf();
}
else
Log.d(gpsTrackerTag, "stopService(): Service Already Stopped");
}
public class MyHandlerCallback implements Callback
{
@Override
public boolean handleMessage(Message arg0) {
Location l;
CharSequence text;
Toast t;
LatLng mLatLng;
int pos = 1;
switch(arg0.what)
{
case GpsTracker.LOCATION_NETWORK_UNAVAILABLE:
text = "Network Location Unavailable";
t = Toast.makeText(getApplicationContext(), text, Toast.LENGTH_LONG);
t.show();
return true;
case GpsTracker.NETWORK_LOCATION_UPDATE:
l = ((Location)arg0.obj);
mLatLng = new LatLng(l.getLatitude(), l.getLongitude());
mpolyOptions.add(mLatLng).width(2).color(Color.BLACK).geodesic(true);
mMap.addPolyline(mpolyOptions);
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(mLatLng, 12));
mMap.addMarker(new MarkerOptions()
.position(mLatLng)
.title("Pos " + pos));
//text = ((Location)arg0.obj).toString();
t = Toast.makeText(getApplicationContext(), "Network Location Update", Toast.LENGTH_LONG);
t.show();
return true;
case GpsTracker.GPS_LOCATION_UPDATE:
l = ((Location)arg0.obj);
mLatLng = new LatLng(l.getLatitude(), l.getLongitude());
//mpolyOptions.add(mLatLng).width(2).color(Color.BLACK).geodesic(true);
//mMap.addPolyline(mpolyOptions);
boolean check = mMap.isMyLocationEnabled();
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(mLatLng, 12));
//text = ((Location)arg0.obj).toString();
t = Toast.makeText(getApplicationContext(), "GPS Location Update", Toast.LENGTH_LONG);
t.show();
return true;
case GpsTracker.LOCATION_GPS_UNAVAILABLE:
text = "Gps Location Unavailable";
t = Toast.makeText(getApplicationContext(), text, Toast.LENGTH_LONG);
t.show();
return true;
default:
return false;
}
}
}
在MyCallBackHandler情况下GPS_LOCATION_UPDATE地图不移动相机。
同样在这里的问题 – Fido