報錯了“Call requires permission which may be rejected by user: code should explicitly check to see if permission is available (with checkPermission) or explicitly handle a potential SecurityException”
許可權問題
使用時，需要檢查使用者是否授權
參考連結1：http://blog.5ibc.net/p/62176.html
參考連結2：http://blog.csdn.net/qq_27278679/article/details/51095770

private void getlocationGps(){
//此處的判定是主要問題，API23之後需要先判斷之後才能呼叫locationManager中的方法

//包括這裡的getLastKnewnLocation方法和requestLocationUpdates方法
    if(ContextCompat.checkSelfPermission(this,android.Manifest.permission.ACCESS_FINE_LOCATION)== PackageManager.PERMISSION_GRANTED) {
        //獲取定位服務
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        //獲取當前可用的位置控制器
 

        List<String> list = locationManager.getProviders(true);

        if (list.contains(LocationManager.GPS_PROVIDER)) {
            //是否為GPS位置控制器
            provider = LocationManager.GPS_PROVIDER;
        } else if (list.contains(LocationManager.NETWORK_PROVIDER)) {
            //是否為網路位置控制器
 

            provider = LocationManager.NETWORK_PROVIDER;

        } else {
            Toast.makeText(this, "請檢查網路或GPS是否開啟",
                    Toast.LENGTH_LONG).show();
            return;
        }
        Location location = locationManager.getLastKnownLocation(provider);
        if (location != null) {
            //獲取當前位置，這裡只用到了經緯度
            String string = "緯度為：" + location.getLatitude() + ",經度為："
                    + location.getLongitude();
        }
//繫結定位事件，監聽位置是否改變
//第一個引數為控制器型別第二個引數為監聽位置變化的時間間隔（單位：毫秒）
//第三個引數為位置變化的間隔（單位：米）第四個引數為位置監聽器
        locationManager.requestLocationUpdates(provider, 2000, 2, locationListener);
    }
}
public LocationListener locationListener=new LocationListener() {
    @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) {

    }
};
    //關閉時解除監聽器
    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        //api23需要這樣寫
        if(ContextCompat.checkSelfPermission(this,android.Manifest.permission.ACCESS_FINE_LOCATION)== PackageManager.PERMISSION_GRANTED) {
            if (locationManager != null) {
                locationManager.removeUpdates(locationListener);
            }
        }
    }