Question

我正在尝试创建一个每五分钟发送一次用户位置更新的应用程序。我想我的代码工作得很好，但我得到关于应用程序正在使用的权限的错误。我很确定我已在清单文件中添加了权限。有人能告诉我什么是错的吗？这是我的代码。

MainActivity.java

IEnumerable

}

我收到错误，因为来电需要获得许可，可能会被用户拒绝 -

LocationManager locationManager ;
String provider;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // Getting LocationManager object
    locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);

    // Creating an empty criteria object
    Criteria criteria = new Criteria();

    // Getting the name of the provider that meets the criteria
    provider = locationManager.getBestProvider(criteria, false);

    if(provider!=null && !provider.equals("")){

        // Get the location from the given provider
        Location location = locationManager.getLastKnownLocation(provider);
        locationManager.requestLocationUpdates(provider,5*60*1000,0,this);

        if(location!=null)
            onLocationChanged(location);
        else
            Toast.makeText(getBaseContext(), "Location can't be retrieved", Toast.LENGTH_SHORT).show();

    }else{
        Toast.makeText(getBaseContext(), "No Provider Found", Toast.LENGTH_SHORT).show();
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public void onLocationChanged(Location location) {
    // Getting reference to TextView tv_longitude
    TextView tvLongitude = (TextView)findViewById(R.id.tv_longitude);

    // Getting reference to TextView tv_latitude
    TextView tvLatitude = (TextView)findViewById(R.id.tv_latitude);

    // Setting Current Longitude
    tvLongitude.setText("Longitude:" + location.getLongitude());

    // Setting Current Latitude
    tvLatitude.setText("Latitude:" + location.getLatitude() );
}

@Override
public void onProviderDisabled(String provider) {
    // TODO Auto-generated method stub
}

@Override
public void onProviderEnabled(String provider) {
    // TODO Auto-generated method stub
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
    // TODO Auto-generated method stub
}

我的 AndroidManifest 就像这样

Location location = locationManager.getLastKnownLocation(provider);
        locationManager.requestLocationUpdates(provider,5*60*1000,0,this);

Answer 1

您使用的是哪种SDK？如果您使用Marshmallow，则需要检查用户是否已为每个位置调用授予权限。

看看Here.

你应该这样做：

if ( ContextCompat.checkSelfPermission( this, android.Manifest.permission.ACCESS_COARSE_LOCATION ) != PackageManager.PERMISSION_GRANTED ) {

            ActivityCompat.requestPermissions( this, new String[] {  android.Manifest.permission.ACCESS_COARSE_LOCATION  },
                                                LocationService.MY_PERMISSION_ACCESS_COURSE_LOCATION );
        }

请求许可，如果你还没有。

查看上面的链接以获取更多信息。

Answer 2

试试我的代码：

public class MainActivity extends AppCompatActivity {

    /* GPS Constant Permission */
    private static final int MY_PERMISSION_ACCESS_COARSE_LOCATION = 11;
    private static final int MY_PERMISSION_ACCESS_FINE_LOCATION = 12;

    /* Position */
    private static final int MINIMUM_TIME = 10000;  // 10s
    private static final int MINIMUM_DISTANCE = 50; // 50m

    /* GPS */
    private String mProviderName;
    private LocationManager mLocationManager;
    private LocationListener mLocationListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        ...

        mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        // Get the best provider between gps, network and passive
        Criteria criteria = new Criteria();
        mProviderName = mLocationManager.getBestProvider(criteria, true);

        // API 23: we have to check if ACCESS_FINE_LOCATION and/or ACCESS_COARSE_LOCATION permission are granted
        if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
                || ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {

            // No one provider activated: prompt GPS
            if (mProviderName == null || mProviderName.equals("")) {
                startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS));
            }

            // At least one provider activated. Get the coordinates
            switch (mProviderName) {
                case "passive":
                    mLocationManager.requestLocationUpdates(mProviderName, MINIMUM_TIME, MINIMUM_DISTANCE, this);
                    Location location = mLocationManager.getLastKnownLocation(mProviderName);
                    break;

                case "network":
                    break;

                case "gps":
                    break;

            }

        // One or both permissions are denied.
        } else {

            // The ACCESS_COARSE_LOCATION is denied, then I request it and manage the result in
            // onRequestPermissionsResult() using the constant MY_PERMISSION_ACCESS_FINE_LOCATION
            if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED ) {
                ActivityCompat.requestPermissions(this,
                        new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
                        MY_PERMISSION_ACCESS_COARSE_LOCATION);
            }
            // The ACCESS_FINE_LOCATION is denied, then I request it and manage the result in
            // onRequestPermissionsResult() using the constant MY_PERMISSION_ACCESS_FINE_LOCATION
            if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED ) {
                ActivityCompat.requestPermissions(this,
                        new String[] { Manifest.permission.ACCESS_FINE_LOCATION },
                        MY_PERMISSION_ACCESS_FINE_LOCATION);
            }

        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        switch (requestCode) {
            case MY_PERMISSION_ACCESS_COARSE_LOCATION: {
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    // permission was granted
                } else {
                    // permission denied
                }
                break;

            case MY_PERMISSION_ACCESS_FINE_LOCATION: {
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    // permission was granted
                } else {
                    // permission denied
                }
                break;
            }

        }
    }
}

来源：LINK

Answer 3

这对我有用

if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
   Toast.makeText(YourService.this, "First enable LOCATION ACCESS in settings.", Toast.LENGTH_LONG).show();
   return;
}
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 100, 1, listener);

Answer 4

以下是解决此问题需要执行的一系列步骤

主要活动.java

if (ContextCompat.checkSelfPermission(this,
 android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
 || ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) 
 == PackageManager.PERMISSION_GRANTED) {         
locationManager.requestLocationUpdates
 (locationManager.requestLocationUpdates(provider,5*60*1000,0,this);
}//end of if

现在您还需要更新 build.gradle

dependencies{
 ------------- //your pre-generated code
compile 'com.android.support:support-v4:23.0.1'
}

this就是Android.Developers所说的。

如果您使用模拟器，不要忘记从应用程序设置 授予权限，因为它可能无法提示

呼叫需要可能被用户拒绝的权限

4 个答案: