【发布时间】：2016-02-17 19:44:20
【问题描述】：
我想在地图上显示我的位置并放大它。我想使用 GoolgeAPIClient。地图渲染并创建了指针，但位置错误。我觉得甚至在调用 GoogleAPIClient 的 onConnected 方法之前就先执行了 onMapReady。请帮助这是我的代码。
import android.location.Location;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.LatLngBounds;
import com.google.android.gms.maps.model.MarkerOptions;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
protected static final String TAG = "MainActivity";
/**
* Provides the entry point to Google Play services.
*/
protected GoogleApiClient mGoogleApiClient;
/**
* Represents a geographical location.
*/
protected Location mLastLocation;
protected String mLatitudeLabel;
protected String mLongitudeLabel;
protected TextView mLatitudeText;
protected TextView mLongitudeText;
protected double dLat;
protected double dLong;
private GoogleMap mMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
buildGoogleApiClient();
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
LatLng myLocation = new LatLng(dLat, dLong);
mMap.addMarker(new MarkerOptions().position(myLocation).title("You are here"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(myLocation));
}
/**
* BEGIN
*/
/**
* Builds a GoogleApiClient. Uses the addApi() method to request the LocationServices API.
*/
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
@Override
protected void onStart() {
super.onStart();
mGoogleApiClient.connect();
}
@Override
protected void onStop() {
super.onStop();
if (mGoogleApiClient.isConnected()) {
mGoogleApiClient.disconnect();
}
}
/**
* Runs when a GoogleApiClient object successfully connects.
*/
@Override
public void onConnected(Bundle connectionHint) {
// Provides a simple way of getting a device's location and is well suited for
// applications that do not require a fine-grained location and that do not need location
// updates. Gets the best and most recent location currently available, which may be null
// in rare cases when a location is not available.
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (mLastLocation != null) {
dLat = mLastLocation.getLatitude();
dLong = mLastLocation.getLongitude();
} else {
Toast.makeText(this, R.string.no_location_detected, Toast.LENGTH_LONG).show();
}
}
@Override
public void onConnectionFailed(ConnectionResult result) {
// Refer to the javadoc for ConnectionResult to see what error codes might be returned in
// onConnectionFailed.
Log.i(TAG, "Connection failed: ConnectionResult.getErrorCode() = " + result.getErrorCode());
}
@Override
public void onConnectionSuspended(int cause) {
// The connection to Google Play services was lost for some reason. We call connect() to
// attempt to re-establish the connection.
Log.i(TAG, "Connection suspended");
mGoogleApiClient.connect();
}
}
11-17 01:30:39.482 30546-30546/com.gioinout.giohanda E/dalvikvm: Could not find class 'android.app.AppOpsManager', referenced from method com.google.android.gms.common.GooglePlayServicesUtil.zzb
11-17 01:30:39.538 30546-30569/com.gioinout.giohanda E/GMPM: getGoogleAppId failed with status: 10
11-17 01:30:39.539 30546-30569/com.gioinout.giohanda E/GMPM: Uploading is not possible. App measurement disabled
11-17 01:30:39.579 30546-30546/com.gioinout.giohanda E/dalvikvm: Could not find class 'android.app.AppOpsManager', referenced from method com.google.android.gms.common.ma.a
11-17 01:30:39.684 30546-30546/com.gioinout.giohanda E/dalvikvm: Could not find class 'android.app.AppOpsManager', referenced from method com.google.android.gms.common.lt.a
11-17 01:30:40.226 30546-30577/com.gioinout.giohanda E/NativeCrypto: ssl=0x5d26beb8 cert_verify_callback x509_store_ctx=0x60700ab0 arg=0x0
11-17 01:30:40.227 30546-30577/com.gioinout.giohanda E/NativeCrypto: ssl=0x5d26beb8 cert_verify_callback calling verifyCertificateChain authMethod=ECDHE_ECDSA
11-17 01:30:42.982 30546-30579/com.gioinout.giohanda E/NativeCrypto: ssl=0x6151f770 cert_verify_callback x509_store_ctx=0x60910ab0 arg=0x0
11-17 01:30:42.983 30546-30579/com.gioinout.giohanda E/NativeCrypto: ssl=0x6151f770 cert_verify_callback calling verifyCertificateChain authMethod=ECDHE_ECDSA
【问题讨论】：
-
在构建后立即连接它。然后在你的 onStart() 中，在连接之前检查它是否已连接。
-
在浏览了数十个不同实现的示例后，我完全感到困惑。如果可以的话，请告诉我如何将它与适用于我的代码的 sn-p 连接起来，我将不胜感激。
标签： android google-maps-android-api-2