我正在尝试创建一个将使用Google地图支出竞赛电路的网页，并使用某种点来显示和更新用户的当前位置。
我的代码是：
public class TopGearLocationTracker extends FragmentActivity implements
//Specifies methods that Location Services calls when a location client
//is connected or disconnected.//
GooglePlayServicesClient.ConnectionCallbacks,
//Specifies a method that Location Services calls if an error occurs while
//attempting to connect the location client. This method uses the previously-
//defined showErrorDialog method to display an error dialog that attempts to
//fix the problem using Google Play services.
GooglePlayServicesClient.OnConnectionFailedListener,
//The callback method that Location Services invokes to send a location update
//to your application is specified in the LocationListener interface, in the method
//onLocationChanged(). The incoming argument is a Location object containing the
//location's latitude and longitude. The following snippet shows how to specify
//the interface and define the method:
LocationListener
{
// Global constants
/*
* Define a request code to send to Google Play services
* This code is returned in Activity.onActivityResult
*/
private final static int
CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;
// Global variable to hold the current location
Location mCurrentLocation;
private GoogleMap aMap;
// Global constants
// Milliseconds per second
private static final int MILLISECONDS_PER_SECOND = 1000;
// Update frequency in seconds
public static final int UPDATE_INTERVAL_IN_SECONDS = 5;
// Update frequency in milliseconds
private 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 = 1;
// A fast frequency ceiling in milliseconds
private static final long FASTEST_INTERVAL =
MILLISECONDS_PER_SECOND * FASTEST_INTERVAL_IN_SECONDS;
// Define an object that holds accuracy and frequency parameters
LocationRequest mLocationRequest;
// Global variables
LocationClient mLocationClient;
boolean mUpdatesRequested;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.top_gear_location_tracker);
// Set the map up
// Set the map to Top Gear track location
LatLng topGearTrack = new LatLng(51.116492, -0.541767);
aMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
aMap.getUiSettings().setAllGesturesEnabled(false);
aMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
aMap.setMyLocationEnabled(true);
aMap.moveCamera(CameraUpdateFactory.newLatLngZoom(topGearTrack, 15));
setUpMapIfNeeded();
// 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(UPDATE_INTERVAL);
// Set the fastest update interval to 1 second
mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
// Open the shared preferences
//mPrefs = getSharedPreferences("SharedPreferences",
//Context.MODE_PRIVATE);
// Get a SharedPreferences editor
//mEditor = mPrefs.edit();
/*
* Create a new location client, using the enclosing class to
* handle callbacks.
*/
mLocationClient = new LocationClient(this, this, this);
// Start with updates turned off
mUpdatesRequested = false;
}
public void setUpMapIfNeeded()
{
//Do a null check to confirm that we have not already instantiated the map.
if (aMap == null)
{
aMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
.getMap();
//Check if we were successful in obtaining the map.
if (aMap != null)
{
//The Map is verified. It is now safe to manipulate the map.
}
}
}
/*
* Called when the Activity becomes visible.
*/
@Override
protected void onStart()
{
super.onStart();
// Connect the client.
mLocationClient.connect();
}
/*
* Called when the Activity is no longer visible.
*/
@Override
protected void onStop()
{
// Disconnecting the client invalidates it.
mLocationClient.disconnect();
super.onStop();
}
// *************** CHECK FOR GOOGLE PLAY SERVICES *************** //
@SuppressWarnings("unused")
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)
{
// In debug mode, log the status
Log.d("Location Updates",
"Google Play services is available.");
// Continue
return true;
// Google Play services was not available for some reason
}
else
{
// Get the error code
// Get the error dialog from Google Play services
Dialog errorDialog = GooglePlayServicesUtil.getErrorDialog(
resultCode,
this,
CONNECTION_FAILURE_RESOLUTION_REQUEST);
// If Google Play services can provide an error dialog
if (errorDialog != null)
{
// Create a new DialogFragment for the error dialog
ErrorDialogFragment errorFragment =
new ErrorDialogFragment();
// Set the dialog in the DialogFragment
errorFragment.setDialog(errorDialog);
// Show the error dialog in the DialogFragment
errorFragment.show(getSupportFragmentManager(),
"Location Updates");
}
}
return false;
}
// Define a DialogFragment that displays the error dialog
public static class ErrorDialogFragment extends DialogFragment
{
// Global field to contain the error dialog
private Dialog mDialog;
// Default constructor. Sets the dialog field to null
public ErrorDialogFragment()
{
super();
mDialog = null;
}
// Set the dialog to display
public void setDialog(Dialog dialog)
{
mDialog = dialog;
}
// Return a Dialog to the DialogFragment.
@Override
public Dialog onCreateDialog(Bundle savedInstanceState)
{
return mDialog;
}
}
/*
* Handle results returned to the FragmentActivity
* by Google Play services
*/
@Override
protected void onActivityResult(
int requestCode, int resultCode, Intent data)
{
// Decide what to do based on the original request code
switch (requestCode)
{
case CONNECTION_FAILURE_RESOLUTION_REQUEST :
/*
* If the result code is Activity.RESULT_OK, try
* to connect again
*/
switch (resultCode) {
case Activity.RESULT_OK :
/*
* Try the request again
*/
break;
}
}
}
// ******************** CALLBACK METHODS AND INTERFACES ******************** //
/*
* 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 dataBundle)
{
// Display the connection status
Toast.makeText(this, "Connected", Toast.LENGTH_SHORT).show();
// If already requested, start periodic updates
if (mUpdatesRequested)
{
mLocationClient.requestLocationUpdates(mLocationRequest, this);
}
}
/*
* Called by Location Services if the connection to the
* location client drops because of an error.
*/
@Override
public void onDisconnected()
{
// Display the connection status
Toast.makeText(this, "Disconnected. Please re-connect.",
Toast.LENGTH_SHORT).show();
}
/*
* Called by Location Services if the attempt to
* Location Services fails.
*/
@Override
public void onConnectionFailed(ConnectionResult connectionResult)
{
/*
* 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()) {
try
{
// Start an Activity that tries to resolve the error
connectionResult.startResolutionForResult(
this,
CONNECTION_FAILURE_RESOLUTION_REQUEST);
/*
* Thrown if Google Play services cancelled the original
* PendingIntent
*/
}
catch (IntentSender.SendIntentException e)
{
// Log the error
e.printStackTrace();
}
}
else
{
/*
* If no resolution is available, display a dialog to the
* user with the error.
*/
showErrorDialog(connectionResult.getErrorCode());
}
}
private void showErrorDialog(int errorCode)
{
new AlertDialog.Builder(this)
.setMessage(String.valueOf(errorCode))
.setPositiveButton(android.R.string.ok,
new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int id)
{
dialog.dismiss();
}
}).show();
}
// Define the callback method that receives location updates
@Override
public void onLocationChanged(Location location)
{
// Report to the UI that the location was updated
String msg = "Updated Location: " +
Double.toString(location.getLatitude()) + "," +
Double.toString(location.getLongitude());
Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
}
}
当我尝试加载此页面时＃39;通过单击上一页中的按钮，它不会加载。我至少期待加载地图（Top Gear测试轨道）。
什么可以阻止地图加载？ 我的方法是创造我正确的方法吗？
我几乎跟着： http://developer.android.com/training/location/retrieve-current.html http://developer.android.com/training/location/receive-location-updates.html （我对共享偏好的事情感到困扰）。
我想测试它我最好使用我的家乡位置lat / lang但是目前我无法显示地图？这是在我的HTC One上测试的，所以不应该是Google Play服务问题，因为加载这个问题的屏幕是静态的（放大/缩小除外）地图。
我很欣赏这是一个很大的＆＃39;问题，我希望有经验的人提供反馈/创建一个位置感知的＆＃39;应用
感谢。
答案 0 :(得分：0)
添加Android Manifest权限：
<uses-permission android:name=”android.permission.INTERNET"/>
和
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="copy your API Key here"/>
添加地图片段：
和
…
private static final LatLng CHANDLER = new LatLng(33.455,-112.0668);
…
private static final StoreLocation[] ALLRESTURANTLOCATIONS = new StoreLocation[] {
new StoreLocation(new LatLng(33.455,-112.0668), new String("Phoenix, AZ")),
new StoreLocation(new LatLng(33.5123,-111.9336), new String("SCOTTSDALE, AZ")),
new StoreLocation(new LatLng(33.3333,-111.8335), new String("Chandler, AZ")),
new StoreLocation(new LatLng(33.4296,-111.9436), new String("Tempe, AZ")),
new StoreLocation(new LatLng(33.4152,-111.8315), new String("Mesa, AZ")),
new StoreLocation(new LatLng(33.3525,-111.7896), new String("Gilbert, AZ"))
};
…
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.geolocation_view);
mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.storelocationmap)).getMap();
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(CHANDLER, ZOOM_LEVEL));
Drawable iconDrawable = getResources().getDrawable(R.drawable.ic_launcher);
Bitmap iconBmp = ((BitmapDrawable) iconDrawable).getBitmap();
for(int ix = 0; ix < ALLRESTURANTLOCATIONS.length; ix++) {
mMap.addMarker(new MarkerOptions()
.position(ALLRESTURANTLOCATIONS[ix].mLatLng)
.icon(BitmapDescriptorFactory.fromBitmap(iconBmp)));
}
然后添加LocationListener和位置更新回调。