我正在编写跟踪地图。在getDeviceLocation方法中，我想分配：
prevLat = mLastKnownLocation.getLatitude（）;
prevLng = mLastKnownLocation.getLongitude（）;
但它崩溃了应用程序。我希望稍后在distanceBetween（）中为它分配它，以便在每次更改位置后获得距离。当通过killApp（）关闭活动时，它应该总结所有距离并给我一个总计。它也会崩溃应用程序，因此它已被评论。
整个活动：
package com.example.micha.aplikacjatreningowa;
import android.Manifest;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.support.v4.app.DialogFragment;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationRequest;
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 static android.location.Location.distanceBetween;
import static java.lang.Math.pow;
public class MapActivity extends AppCompatActivity implements OnMapReadyCallback, com.google.android.gms.location.LocationListener,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener {
private static final String TAG = MapActivity.class.getSimpleName();
private GoogleMap mMap;
private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;
private CameraPosition mCameraPosition;
private static final int DEFAULT_ZOOM = 20;
private static final int PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION = 1;
private boolean mLocationPermissionGranted = false;
private Location mLastKnownLocation;
private static final String KEY_CAMERA_POSITION = "camera_position";
private static final String KEY_LOCATION = "location";
private static final int UPDATE_INTERVAL = 1000;
private static final int FASTEST_INTERVAL = 500;
private static final int DISPLACEMENT = 1;
public double prevLat;
public double prevLng;
float totalDistance;
float[] distance;
float[] cBurned;
Float totalCalories;
public Button End;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Ustalanie mapy
setContentView(R.layout.activity_map);
//Budowanie klienta API do użytku w wyznaczaniu położenia
mGoogleApiClient = new GoogleApiClient.Builder(this)
.enableAutoManage(this, this)
.addConnectionCallbacks(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
createLocationRequest();
endButton();
}
//Zapisuje stan aplikacji
protected void onSaveInstanceState(Bundle outState) {
if (mMap != null) {
outState.putParcelable(KEY_CAMERA_POSITION, mMap.getCameraPosition());
outState.putParcelable(KEY_LOCATION, mLastKnownLocation);
super.onSaveInstanceState(outState);
}
}
@Override
public void onConnected(@Nullable Bundle bundle) {
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
//Gdy połączenie się nie uda
public void onConnectionFailed(@NonNull ConnectionResult result) {
Log.d(TAG, "Połączenie nieudane: ConnectionResult.getErrorCode() = " + result.getErrorCode());
}
//Gdy połączenie zostanie wstrzymane
public void onConnectionSuspended() {
Log.d(TAG, "Połączenie wstrzymane");
}
//Pobieranie lokacji użytkownika
private void getDeviceLocation() {
//Prośba o pozwolenie na zczytanie lokacji urządzenia
if (ContextCompat.checkSelfPermission(this.getApplicationContext(), Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
} else {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);
}
//Pobranie lokacji urządzenia
if (mLocationPermissionGranted) {
mLastKnownLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if(mLastKnownLocation != null) {
prevLat=mLastKnownLocation.getLatitude();
prevLng=mLastKnownLocation.getLongitude();
}
}
moveCamera();
}
//Po otrzymaniu pozwolenia
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults) {
mLocationPermissionGranted = false;
switch (requestCode) {
case PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION: {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
mLocationPermissionGranted = true;
}
}
}
updateLocationUI();
}
//Gdy mapa jest już gotowa
@Override
public void onMapReady(GoogleMap map) {
mMap=map;
updateLocationUI();
getDeviceLocation();
startLocationUpdates();
}
private void updateLocationUI() {
if (mMap == null) {
return;
}
if (ContextCompat.checkSelfPermission(this.getApplicationContext(), Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
mLocationPermissionGranted = true;
} else {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);
}
if (mLocationPermissionGranted) {
mMap.setMyLocationEnabled(true);
} else {
mMap.setMyLocationEnabled(false);
mLastKnownLocation = null;
}
}
protected void startLocationUpdates() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) !=
PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);
}
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
@Override
public void onLocationChanged(Location location) {
moveCamera();
float velocity = location.getSpeed();
float caloriesBurned;
String extra = getIntent().getStringExtra("EXTRA_MODE_TYPE");
switch (extra) {
case"walk": {
distanceBetween(prevLat, prevLng, location.getLatitude(), location.getLongitude(), distance);
prevLat=location.getLatitude();
prevLng=location.getLongitude();
double dbcaloriesBurned =(0.0215*pow(velocity*3600/1000, 3)-0.1765*pow(velocity*3600/1000, 2)+0.8710* + 1.4577*velocity*3600/1000);
caloriesBurned = (float)dbcaloriesBurned;
int count = 0;
cBurned[count] = caloriesBurned;
count++;
if (velocity > 2) {
killApp();
}
break;
}
case "run": {
distanceBetween(prevLat, prevLng, location.getLatitude(), location.getLongitude(), distance);
prevLat = location.getLatitude();
prevLng = location.getLongitude();
double dbcaloriesBurned = (0.0215 * pow(velocity * 3600 / 1000, 3) - 0.1765 * pow(velocity * 3600 / 1000, 2) + 0.8710 * +1.4577 * velocity * 3600 / 1000);
caloriesBurned = (float) dbcaloriesBurned;
int count = 0;
cBurned[count] = caloriesBurned;
count++;
if (velocity > 3) {
killApp();
}
break;
}
case "ride": {
distanceBetween(prevLat, prevLng, location.getLatitude(), location.getLongitude(), distance);
prevLat = location.getLatitude();
prevLng = location.getLongitude();
double dbcaloriesBurned = (0.0215 * pow(velocity * 3600 / 1000, 3) - 0.1765 * pow(velocity * 3600 / 1000, 2) + 0.8710 * +1.4577 * velocity * 3600 / 1000);
caloriesBurned = (float) dbcaloriesBurned;
int count = 0;
cBurned[count] = caloriesBurned;
count++;
if (velocity > 5) {
killApp();
}
break;
}
}
}
protected void createLocationRequest() {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(UPDATE_INTERVAL);
mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setSmallestDisplacement(DISPLACEMENT);
}
public void endButton(){
End = (Button)findViewById(R.id.End);
End.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
killApp();
}
});
}
public void moveCamera() {
if (mCameraPosition != null) {
mMap.moveCamera(CameraUpdateFactory.newCameraPosition(mCameraPosition));
} else if (mLastKnownLocation != null) {
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(mLastKnownLocation.getLatitude(),
mLastKnownLocation.getLongitude()), DEFAULT_ZOOM));
}
}
public void killApp() {
stopLocationUpdates();
/*for(int i=0; i<=distance.length; i++) {
totalDistance += distance[i];
}
for(int j=0; j<cBurned.length; j++) {
totalCalories += cBurned[j];
}*/
AlertDialog.Builder builder = new AlertDialog.Builder(MapActivity.this);
builder.setMessage("Koniec treningu!\nPrzebiegłeś: " + totalDistance +" metrów.\nSpaliłeś: " + totalCalories +" kalorii.")
.setCancelable(false)
.setPositiveButton("Zakończ", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
finish();
}
})
.create().show();
}
protected void stopLocationUpdates() {
LocationServices.FusedLocationApi.removeLocationUpdates(
mGoogleApiClient, this);
}
@Override
public void onConnectionSuspended(int i) {
}
}
编辑： 崩溃日志：
--------- beginning of crash
05-24 22:16:57.509 2930-2930/com.example.micha.aplikacjatreningowa E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.micha.aplikacjatreningowa, PID: 2930
java.lang.SecurityException: Client must have ACCESS_FINE_LOCATION permission to request PRIORITY_HIGH_ACCURACY locations.
at android.os.Parcel.readException(Parcel.java:1599)
at android.os.Parcel.readException(Parcel.java:1552)
at com.google.android.gms.internal.zzase$zza$zza.zza(Unknown Source)
at com.google.android.gms.internal.zzasg.zza(Unknown Source)
at com.google.android.gms.internal.zzash.zza(Unknown Source)
at com.google.android.gms.internal.zzary$1.zza(Unknown Source)
at com.google.android.gms.internal.zzary$1.zza(Unknown Source)
at com.google.android.gms.internal.zzaad$zza.zzb(Unknown Source)
at com.google.android.gms.internal.zzaaq.zze(Unknown Source)
at com.google.android.gms.internal.zzaaq.zzb(Unknown Source)
at com.google.android.gms.internal.zzaav.zzb(Unknown Source)
at com.google.android.gms.internal.zzaat.zzb(Unknown Source)
at com.google.android.gms.internal.zzary.requestLocationUpdates(Unknown Source)
at com.example.micha.aplikacjatreningowa.MapActivity.startLocationUpdates(MapActivity.java:187)
at com.example.micha.aplikacjatreningowa.MapActivity.onMapReady(MapActivity.java:156)
at com.google.android.gms.maps.SupportMapFragment$zza$1.zza(Unknown Source)
at com.google.android.gms.maps.internal.zzt$zza.onTransact(Unknown Source)
at android.os.Binder.transact(Binder.java:387)
at com.google.android.gms.maps.internal.bw.a(:com.google.android.gms.DynamiteModulesB:82)
at com.google.maps.api.android.lib6.impl.bf.run(:com.google.android.gms.DynamiteModulesB:1805)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
编辑2：由于startLocationUpdates（）方法
，应用程序崩溃答案 0 :(得分：1)
您没有正确处理Android运行时权限，因为您在条件时请求权限
Manifest.permission.ACCESS_FINE_LOCATION == PackageManager.PERMISSION_GRANTED是真的。再次检查您的代码。
你应该这样做：
String permission = Manifest.permission.ACCESS_FINE_LOCATION;
if (!isPermissionGranted(permission)) {
if (isRationaleExplanationNeeded(permission)) {
//show dialog to explain why you need permission
} else {
ActivityCompat.requestPermissions(this, new String[]{permission},
PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);
}
} else {
//do what ever you need to do
}
我认为由于未获得许可，您将获得安全例外。
上面提到的函数：
private boolean isPermissionGranted(String permission) {
int hasRequestedPermission = ContextCompat.checkSelfPermission(this, permission);
return hasRequestedPermission == PackageManager.PERMISSION_GRANTED;
}
private boolean isRationaleExplanationNeeded(String permission) {
return ActivityCompat.shouldShowRequestPermissionRationale(activity, permission);
}