您好我有一项服务，我找到了用户位置的坐标。此服务在我的MainActivity中的onCreate中启动。然而，直到它找到值，因为我知道GPS可能需要一些时间来找到坐标，屏幕是黑色的。我创建了一个我想展示的启动画面，但我不确定如何实现。我的代码将解释更多：
我的服务：
public class LocationService extends Service implements
GooglePlayServicesClient.ConnectionCallbacks,
GooglePlayServicesClient.OnConnectionFailedListener,
LocationListener {
public static double curlat;
public static double curlong;
IBinder mBinder = new LocalBinder();
private LocationClient mLocationClient;
private LocationRequest mLocationRequest;
// Flag that indicates if a request is underway.
private boolean mInProgress;
public static final String BROADCAST_ACTION = "com.example.fusedlocation.displayevent";
Intent intent;
private Boolean servicesAvailable = false;
public class LocalBinder extends Binder {
public LocationService getServerInstance() {
return LocationService.this;
}
}
@Override
public void onCreate() {
super.onCreate();
intent = new Intent(BROADCAST_ACTION);
mInProgress = false;
// Create the LocationRequest object
mLocationRequest = LocationRequest.create();
// Use high accuracy
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_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();
/*
* Create a new location client, using the enclosing class to
* handle callbacks.
*/
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;
}
/*
* Create a new location client, using the enclosing class to
* handle callbacks.
*/
private void setUpLocationClientIfNeeded()
{
if(mLocationClient == null)
mLocationClient = new LocationClient(this, this, this);
}
// Define the callback method that receives location updates
@Override
public void onLocationChanged(android.location.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);
curlat = location.getLatitude();
curlong = location.getLongitude();
// Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
appendLog(msg, Constants.LOCATION_FILE);
intent.putExtra("Latitude", location.getLatitude());
intent.putExtra("Longitude", location.getLongitude());
sendBroadcast(intent, null);
}
@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();
}
/*
* Called by Location Services when the request to connect the
* client finishes successfully. At this point, you can
* request the current location or start periodic updates
*/
@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);
}
/*
* Called by Location Services if the connection to the
* location client drops because of an error.
*/
@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);
}
/*
* Called by Location Services if the attempt to
* Location Services fails.
*/
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
mInProgress = false;
/*
* Google Play services can resolve some errors it detects.
* If the error has a resolution, try sending an Intent to
* start a Google Play services activity that can resolve
* error.
*/
if (connectionResult.hasResolution()) {
// If no resolution is available, display an error dialog
} else {
}
}
}
MainActivity（仅限相关部分）：
public class MainActivity extends Activity implements
GooglePlayServicesClient.ConnectionCallbacks,
GooglePlayServicesClient.OnConnectionFailedListener{
// Google Map & markers
private GoogleMap googleMap;
private Circle mCircle;
private Marker mMarker;
double radiusInMeters;
long start_time, countUp, timeDialogShown = 0;
double latitude, longitude, startLongitude, startLatitude;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Setting the layout
setContentView(R.layout.activity_main);
try {
// Loading map
initilizeMap();
} catch (Exception e) {
e.printStackTrace();
}
startService(new Intent(this, LocationService.class));
} // end onCreate
//Checking the latest location updates
private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Bundle extras = intent.getExtras();
latitude = extras.getDouble("Latitude");
longitude = extras.getDouble("Longitude");
LatLng latLng = new LatLng(latitude, longitude);
if (mCircle == null || mMarker == null) {
drawMarkerWithCircle(latLng);
} else {
updateMarkerWithCircle(latLng);
}
getDistance();
//Getting the current weather conditions
//if (condDescr.getText().equals(" ")){
// getWeatherConditions();
//}
//Check if the user has breached the Geofence boundaries
checkBoundaries();
}
};
答案 0 :(得分：0)
创建splash_screen活动。将其设置为启动活动。
在此splash_screen活动的onCreate（）中，您可以启动服务以获取位置更新。
完成位置更新后，启动您的MainAcitivity.class。
protected void onCreate(android.os.Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.splash_screen_layout);
Thread t1 = new Thread(new Runnable() {
@Override
public void run() {
// start the service to get location update
try {
Thread.sleep(5000);
}
catch (InterruptedException e) {
e.printStackTrace();
}
// start the main activity
}
});
t1.start();
}
答案 1 :(得分：0)
在这里查看我的答案： Android SplashScreen
基本上创建主题背景将处理黑屏，直到您设置内容。