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所以我使用凌空从数据库读取值到我的android应用程序,我有一个问题,当我尝试从我的数据库选择经度和纬度,意图使用我得到的值响应运行速度比响应实际需要从数据库获取选定值的速度快,这会导致始终打开位置为0,0的Google地图片段。Android意图运行速度比响应
这是我的Android代码
Response.Listener<String> responseListener4 =new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonResponse = new JSONObject(response);
boolean success=jsonResponse.getBoolean("success");
if (success) {
lat= jsonResponse.getDouble("lat");
lng= jsonResponse.getDouble("lng");
System.out.println(lat);
System.out.println(lng);
Intent i2=new Intent(lists_activity.this,supervisor_maps.class);
i2.putExtra("lat",lat);
i2.putExtra("lng",lng);
startActivity(i2);
} else {
AlertDialog.Builder builder = new AlertDialog.Builder(lists_activity.this);
builder.setMessage("Loading Trucks Failed...")
.setNegativeButton("Retry",null)
.create()
.show();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
};
UpdatedLocation updatedLocation=new UpdatedLocation(cmp,splitted[1],responseListener4);
RequestQueue queue=Volley.newRequestQueue(lists_activity.this);
queue.add(updatedLocation);
,这是我应该去和从进入分片打开位置的类。
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(GoogleServiceAvailable())
{
Toast.makeText(this,"Perfect!!!",Toast.LENGTH_LONG).show();
setContentView(R.layout.activity_driver_maps);
Intent test=getIntent();
test.getDoubleExtra("lat",latitude);
test.getDoubleExtra("lng",longitude);
System.out.println(latitude);
System.out.println(longitude);
initMap();
}
else
{
setContentView(R.layout.error);
}
}
public boolean GoogleServiceAvailable()
{
GoogleApiAvailability api=GoogleApiAvailability.getInstance();
int isAvailable=api.isGooglePlayServicesAvailable(this);
if (isAvailable== ConnectionResult.SUCCESS)
{
return true;
}
else if (api.isUserResolvableError(isAvailable))
{
Dialog dialog=api.getErrorDialog(this,isAvailable,0);
dialog.show();
}
else
{
Toast.makeText(this,"Cant connect to play services",Toast.LENGTH_LONG).show();
}
return false;
}
private void initMap() {
MapFragment mapFragment= (MapFragment) getFragmentManager().findFragmentById(R.id.mapFragment);
mapFragment.getMapAsync(this);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mGoogleMap=googleMap;
goToLocation(latitude, longitude,15);
}
private void goToLocation(double lat, double lng, float zoom) {
LatLng ll=new LatLng(lat,lng);
CameraUpdate update= CameraUpdateFactory.newLatLngZoom(ll,zoom);
mGoogleMap.moveCamera(update);
mGoogleMap.addMarker(new MarkerOptions().position(new LatLng(latitude,longitude)).title("Your Location."));
}
}
当然,你可以猜测第一2的System.out不打印时,在第二类中的位置,在这种情况下是一个30,30测试值,但第二的System.out的只打印0,0
idk说什么男人,谢谢,完美答案:D –