用户必须通过点击地图添加标记。我的目标是将名称，类别，纬度和经度发送到SQL数据库 我遵循了这个问题：How can you pass multiple primitive parameters to AsyncTask?，但我在这行中收到错误：
backgroundTask.execute(method,Name,Category,Latitude,Longitude);
参见代码：
AddShopActivity.java
public class AddShopActivity extends MainScreen implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, com.google.android.gms.location.LocationListener {
Spinner spinner;
ArrayAdapter<CharSequence> adapter;
GoogleMap mGoogleMap;
GoogleApiClient mGoogleApiClient;
String Name, Category;
Double Latitude, Longitude, Latitude_pass, Longitude_pass;
EditText shop_name = (EditText)findViewById(R.id.Shop_Name);
Spinner shop_category = (Spinner)findViewById(R.id.spinner);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_shop);
initMap();
spinner = (Spinner) findViewById(R.id.spinner);
adapter = ArrayAdapter.createFromResource(this, R.array.eidoskatastimatos, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
}
private void initMap() {
MapFragment mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.mapFragment);
mapFragment.getMapAsync(this);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mGoogleMap = googleMap;
mGoogleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
mGoogleMap.getUiSettings().setZoomControlsEnabled(true);
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
mGoogleApiClient.connect();
}
LocationRequest mLocationsRequest;
@Override
public void onConnected(Bundle bundle) {
mLocationsRequest = LocationRequest.create();
mLocationsRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationsRequest.setInterval(5000);
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) {
// 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.
return;
}
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationsRequest, this);
mGoogleMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
@Override
public void onMapClick(LatLng latLng) {
MarkerOptions marker = new MarkerOptions()
.position(new LatLng(latLng.latitude, latLng.longitude))
.draggable(true)
.title(shop_name.getText().toString())
.snippet(shop_category.getSelectedItem().toString());
CameraUpdate update = CameraUpdateFactory.newLatLngZoom(latLng, 16);
mGoogleMap.animateCamera(update);
mGoogleMap.clear();
mGoogleMap.addMarker(marker);
Latitude_pass = latLng.latitude;
Longitude_pass = latLng.longitude;
}
});
}
public void shopReg(View view)
{
Name = shop_name.getText().toString();
Category = shop_category.getSelectedItem().toString();
Latitude = Latitude_pass;
Longitude = Longitude_pass;
String method = "save";
BackgroundTask backgroundTask = new BackgroundTask(this);
backgroundTask.execute(method,Name,Category,Latitude,Longitude); //here is the error. It asks me to create the method 'execute' but the guy in a tutorial I am watching doen't do this//
finish();
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
@Override
public void onLocationChanged(Location location) {
if (location == null){
Toast.makeText(this, "Can't get current location", Toast.LENGTH_LONG).show();
} else {
LatLng ll = new LatLng(location.getLatitude(), location.getLongitude());
CameraUpdate update = CameraUpdateFactory.newLatLngZoom(ll, 16);
mGoogleMap.animateCamera(update);
}
}
}
BackgroundTask.java
public class BackgroundTask extends AsyncTask<String,Void,String> {
String Name, Category;
Double Latitude, Longitude;
BackgroundTask(String method, String Name, String Category, Double Latitude, Double Longitude) {
this.Name = Name;
this.Category = Category;
this.Latitude = Latitude;
this.Longitude = Longitude;
} //Trying to pass 2 types of variablew, string and double, because lat and long are double//
Context ctx;
BackgroundTask(Context ctx){
this.ctx = ctx;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected String doInBackground(String... params) {
String reg_url = "http://10.0.2.2/shop/register.php";
String method = params[0];
if(method.equals("save"))
{
String Name = params[1];
String Category = params[2];
String Latitude = params[3];
String Longitude = params[4];
try {
URL url = new URL(reg_url);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
OutputStream OS = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(OS, "UTF-8"));
String data = URLEncoder.encode("Name", "UTF-8") +"="+URLEncoder.encode(Name,"UTF-8")+"&"+
URLEncoder.encode("Category", "UTF-8") +"="+URLEncoder.encode(Category,"UTF-8")+"&"+
URLEncoder.encode("Latitude", "UTF-8") +"="+URLEncoder.encode(Latitude,"UTF-8")+"&"+
URLEncoder.encode("Longitude", "UTF-8") +"="+URLEncoder.encode(Longitude,"UTF-8");
bufferedWriter.write(data);
bufferedWriter.flush();
bufferedWriter.close();
OS.close();
InputStream IS = httpURLConnection.getInputStream();
IS.close();
return "Το κατάστημα προστέθηκε!";
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(String result) {
Toast.makeText(ctx,result,Toast.LENGTH_LONG).show();
}
}
答案 0 :(得分：3)
再次检查链接的问题。你错过了＆＃34; Params＆＃34;类。
execute的参数会传递到doInBackground，您只需要String[]。但是，这并不是错误的确切位置
您的其他构造函数未被用于获得2个字符串和2个双打
您只使用了Context 1
new BackgroundTask(this);
我正在观看的教程
我只能说再试一次，或者找另一个
我打赌它只调用execute("save");并且有类似的东西
// add the context to this constructor also
new BackgroundTask(this, Name, Category, Latitude, Longitude);
或者，查看Asynctask，您需要使用Double.parseDouble并且必须传递字符串
String Name = params[1];
String Category = params[2];
Double Latitude = Double.parseDouble(params[3]);
Double Longitude = Double.parseDouble(params[4]);
答案 1 :(得分：0)
参数传递给AsyncTask<String...方法的execute都是String类型。你传递的是String和double。
一般建议按照驼峰惯例约定编写变量。使用私人访客。
你的AsyncTask应该是
public class BackgroundTask extends AsyncTask {
private String name, category;
private double latitude, longitude;
BackgroundTask(double latitude, double longitude) {
this.latitude = latitude;
this.longitude = longitude;
}
}
现在你的构造函数初始化你的双打并从你现在的params中获取字符串。