Question

我想确保如果用户在应用程序启动时关闭GPS位置，则会出现一个弹出窗口，并将您重定向到可以切换GPS位置的位置。我能够做到这一点，但一旦我回到我的应用程序，它不再在我的位置居中，除非我关闭应用程序并再次启动它。 我做错了什么？

private boolean hasPermissions(){
    return ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED &&
            ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED &&
            ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED;
}

在onCreate中：

if (hasPermissions()) {
        setMap();
        initMyLocation();
        centerButton();
    } else {
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE,
                Manifest.permission.ACCESS_FINE_LOCATION,
                Manifest.permission.ACCESS_COARSE_LOCATION}, 1);
    }

setMap，initMyLocation，centerButton方法：

public void setMap(){
    map = findViewById(R.id.mapview);
    map.setTileSource(TileSourceFactory.MAPNIK);
    map.setTilesScaledToDpi(true);
    map.setBuiltInZoomControls(true);
    map.setMultiTouchControls(true);

}
 public void initMyLocation(){

    final LocationManager lm = (LocationManager) getSystemService(LOCATION_SERVICE);

    if(!lm.isProviderEnabled(LocationManager.GPS_PROVIDER) || !lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER)){
        //Build the alert dialog
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Something.");
        builder.setMessage("activate GPS.");
        builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                startActivity(intent);
            }
        });
        Dialog alertDialog = builder.create();
        alertDialog.setCanceledOnTouchOutside(false);
        alertDialog.show();


    }

    GpsMyLocationProvider provider = new GpsMyLocationProvider(getApplicationContext());

    provider.addLocationSource(LocationManager.GPS_PROVIDER);
    provider.addLocationSource(LocationManager.NETWORK_PROVIDER);
    locationNewOverlay = new MyLocationNewOverlay(provider, map);
    locationNewOverlay.enableMyLocation();

    map.getOverlays().add(locationNewOverlay);


}
public void centerButton() {
    ImageButton btCenterMap = this.findViewById(R.id.menu_mylocation);
    btCenterMap.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            locationNewOverlay.runOnFirstFix(new Runnable() {
                @Override
                public void run() {
                    myLocation = locationNewOverlay.getMyLocation();
                }
            });
            locationNewOverlay.enableFollowLocation();

        }
    });
}

Answer 1

我认为你的逻辑必须是这样的：

检查方法 - 检查权限以及GPS /网络位置是否可用

如果权限检查失败，请询问权限。成功后，再次运行检查方法
如果gps检查失败，请重定向到设置页面
如果两者都是，则创建位置叠加并将其添加到地图

简历

运行检查方法

暂停时

销毁我的位置叠加层，将其从地图中移除

OSMdroid GPS启用/禁用用户弹出窗口

1 个答案: