我是Android的初学者，由于所有示例都在新的API 23之前，我在活动之外创建GPS时遇到问题，由于需要询问权限，任何人都可以给出提示我在主要活动中创建GPS时没有遇到任何问题，因为我不知道如何绕过主要的checkSelfPermission（），因为如果我在调用requestLocationUpdate时没有测试它（ ）在main之外它给了我一个错误（我需要在两个文件中使用checkselfPermission（），否则它在GPStracker.java中给我一个错误），我怎么能在没有测试的情况下每次调用requestLocationUpdate（）..... 我很怀疑是在这个测试中我真的必须这样做所以我可以使用requestLocationUpdate（），有一种方法只做一次吗？ mContext.checkSelfPermission（Manifest.permission.ACCESS_FINE_LOCATION）== PackageManager.PERMISSION_GRANTED 这是我的代码：
GPSTracker.java
public class GpsTracker extends Service implements LocationListener {
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
private final Context mContext;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
Location locationGpS; // locationGPS
Location locationWIFI; // locationWifi
Location location;
double latitudeWifi,latitudeGps,latitude; // latitude
double longitudeWifi,longitudeGps,longitude; // longitude
double altitudeWifi,altitudeGps,altitude; //altitude
float accuracywifi,accuracyGps;
// Declaring a Location Manager
protected LocationManager locationManager;
/*
*Constructor
*/
public GpsTracker(Context context) {
this.mContext = context;
getOptLocation();
}
/*
* GET Best Location
*/
public Location getOptLocation()
{
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
//Error message conncting to any type of Provider
Log.d("Conexão", "service not available ");
} else {
this.canGetLocation = true;
// First get location from Network Provider
//Get wifi and 3g location
/*if i don't make the second part of this test(after &&) inside the
if the next line*/
if (isNetworkEnabled && mContext.checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED ) {
/*this line in the compiler wont work because it
says the request permissions hasn't been asked*/
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Conexão", "Network");
if (locationManager != null) {
locationWIFI = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (locationWIFI != null) {
latitudeWifi = locationWIFI.getLatitude();
longitudeWifi = locationWIFI.getLongitude();
altitudeWifi = locationWIFI.getAltitude();
accuracywifi = locationWIFI.getAccuracy();
Log.d("Conexão", " Conn Network " + latitudeWifi + "," + longitudeWifi + "," + altitudeWifi + "," + accuracywifi + " ");
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled && mContext.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
if (locationGpS == null) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Conexão", "GPS Enabled");
if (locationManager != null) {
locationGpS = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (locationGpS != null) {
latitudeGps = locationGpS.getLatitude();
longitudeGps = locationGpS.getLongitude();
altitudeGps = locationGpS.getAltitude();
accuracyGps = locationGpS.getAccuracy();
Log.d("GPS", " conn GPS" + latitudeGps + "," + longitudeGps + "," + altitudeGps + "," + accuracyGps + " ");
}
}
}
}
Log.d("NET Antes", "Before Net: " + latitudeWifi + "," + longitudeWifi + "," + altitudeWifi + "," + accuracywifi + " ");
Log.d("Gps Antes", "before GPs: " + latitudeGps + "," + longitudeGps + "," + altitudeGps + "," + accuracyGps + " ");
location = getBestlocation(locationGpS, locationWIFI);
Log.d("Location", "FinalLocation: " + latitude + "," + longitude + "," + altitude + " ");
// locationManager.removeUpdates(GpsTracker.this);
}
} catch (Exception e) {
e.printStackTrace();
Log.d("Erro ", e.getMessage());
}
}
}
return location;//getBestlocation(locationGpS, locationWIFI);
}
private Location getBestlocation(Location locationGpS, Location locationWIFI) {
Log.d("GetBest","Best provider");
if(locationWIFI.getAccuracy()>locationGpS.getAccuracy()) {
Log.d("GetBest", "wifi ");
return locationWIFI;
}
else{
Log.d("GetBest", " GPS ");
return locationGpS;
}
}
/**
* Function to get latitude
* @return double
* */
public double getLatitude(){
Log.d("GetLatitude", "Latitude");
if(location != null){
latitude = locationWIFI.getLatitude();
}
else{
Log.d("GetLatitude", "Erro");
}
return latitude;
}
/**
* Function to get longitude
* @return double
* */
public double getLongitude(){
Log.d("GetLongitude", "Longitude ");
if(location != null){
longitude = location.getLongitude();
}
else{
Log.d("GetLatitude", "Erro");
}
return longitude;
}
/**
* Function to get altitude
* @return double
* */
public double getAltitude(){
Log.d("GetAltitude", "Altitude");
if(location != null){
longitude = location.getAltitude();
}
else{
Log.d("GetLatitude", "Erro");
}
return longitude;
}
/**
* Function to check GPS/wifi enabled
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
@Nullable
@Override
public IBinder onBind(Intent arg0) {
return null;
}
}
GPS（活性）
public class MainActivity extends AppCompatActivity {
public Button cord;
public TextView lg;
public TextView lat;
public TextView alt;
GpsTracker gps;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
cord = (Button) findViewById(R.id.bCoordenadas);
lg = (TextView) findViewById(R.id.tvLong);
lat = (TextView) findViewById(R.id.tvLat);
alt = (TextView) findViewById(R.id.tvAlt);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
try {
requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION,
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.INTERNET}, 1000);
Log.d("Request","Passa o Request Permission");
} catch (SecurityException e) {
e.printStackTrace();
Log.e("TAG", "Falha nas Permissões");
}
}
} else {
Toast.makeText(this, "Entra no request Permissions", Toast.LENGTH_LONG).show();
executaGps();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
switch (requestCode) {
case 1000:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
for (int i = 0; i < permissions.length; i++) {
if (grantResults[i] == PackageManager.PERMISSION_GRANTED) {
Log.d("Permissions", "Permission Granted: " + permissions[i]);
} else if (grantResults[i] == PackageManager.PERMISSION_DENIED) {
Log.d("Permissions", "Permission Denied: " + permissions[i]);
}
Toast.makeText(this, "Entra no on request Permissions", Toast.LENGTH_LONG).show();
executaGps();
}
}
}
}
public void executaGps() {
try {
if (gps.canGetLocation()) {
cord.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// create class object
Log.d("Click", "Entra no botao");
gps = new GpsTracker(MainActivity.this);
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
double altitude = gps.getAltitude();
lg.append(" " + longitude + " ");
lat.append(" " + latitude + " ");
alt.append(" " + altitude + " ");
}
});
}
}catch(Exception e)
{
e.printStackTrace();
Log.e("TAG", e.getMessage());
Log.d("Erro ", "try-catch");
}
}
}
任何人都可以给我一个提示，我可以做些什么来绕过主要活动和GpsTracker.java中权限的双重检查？要测试这个，只需创建一个3文本视图和一个按钮，并在Android Manifest.xml中添加使用权限 谢谢