Question

我对osmdroid库很陌生！我正在尝试制作一个可检测并提醒用户特殊事件的应用程序（导航器）。

我遵循了osmdroid Wiki，并成功在低API上添加了地图，但在8.0（API 26）中未显示地图。我试图添加权限，但是地图未显示，尽管它请求了位置权限。你能给我建议一个解决方案吗？在较低的API中，它可以完美运行。

 if (Build.VERSION.SDK_INT < 23) {
    } else {

        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
                ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
                ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)
        {
            // TODO: Consider calling
            //    ActivityCompat#requestPermissions
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for ActivityCompat#requestPermissions for more details.
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},2);

        } else {

            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
        }
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    if(grantResults.length>0 && grantResults[0]== PackageManager.PERMISSION_GRANTED){

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)==PackageManager.PERMISSION_GRANTED){

            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);

        }

    }
}

根据osmwiki，更高级别的API需要请求WRITE_EXTERNAL_STORAGE，ACCESS_COARSE_LOCATION，ACCESS_FINE_LOCATION权限。

API> 23中未显示开放式街道MAP

0 个答案: