为啥我不能从数组中得到正确的日期？
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【中文标题】为啥我不能从数组中得到正确的日期？【英文标题】：why I cannot get correct date from array?为什么我不能从数组中得到正确的日期？ 【发布时间】：2021-01-31 12:09:38 【问题描述】：为什么我不能从数组中得到正确的日期？
我试图从数组中获取正确的日期，我使用 Log.d 方法，日期在数组中，但是当我单击侦听器时，我总是得到最后一个日期。问题出在哪里？
下面是我的代码：
private void loadMaps()
final ProgressDialog progressDialog = new ProgressDialog(getActivity());
progressDialog.setMessage("Load...");
progressDialog.show();
StringRequest stringRequest = new StringRequest(Request.Method.GET, URL_MAPSHOW,
new Response.Listener<String>()
@Override
public void onResponse(String showmaplocation)
progressDialog.dismiss();
try
JSONObject jsonObject = new JSONObject(showmaplocation);
JSONArray jsonArray = jsonObject.getJSONArray("map");
for (int i = 0; i < jsonArray.length(); i++)
JSONObject mapShow = jsonArray.getJSONObject(i);
mapShowArrayList.add(new MapShow(
mapShow.getInt("MapID"),
mapShow.getInt("UserID"),
mapShow.getString("MapLat"),
mapShow.getString("MapLng"),
mapShow.getString("MapTitle"),
mapShow.getString("MapPhoto"),
mapShow.getInt("MapType")
));
final String info = mapShowArrayList.get(i).getTitle();
double latitude = Double.parseDouble(mapShowArrayList.get(i).getLat());
double longitude = Double.parseDouble(mapShowArrayList.get(i).getLng());
//Log.d("data:" , latitude +"," + longitude);
LatLng nowlocat = new LatLng(latitude, longitude);
//Log.d("Location", String.valueOf(nowlocat));
switch (mapShowArrayList.get(i).getMtype())
case 1:
icon = R.drawable.police;
break;
case 2:
icon = R.drawable.ambulance;
break;
case 3:
icon = R.drawable.firetruck;
break;
boolean imageCreated = false;
Bitmap bmp = null;
imageCreated = true;
Bitmap.Config conf = Bitmap.Config.ARGB_8888;
bmp = Bitmap.createBitmap(200, 120, conf);
Canvas canvas1 = new Canvas(bmp);
Paint color = new Paint();
Paint wordcolor = new Paint();
color.setTypeface(Typeface.SANS_SERIF);
color.setTextAlign(Paint.Align.LEFT);
wordcolor.setTextSize(30);
int width = (int)wordcolor.measureText(mapShowArrayList.get(i).getTitle());
color.setColor(Color.WHITE);
wordcolor.setColor(Color.BLACK);
BitmapFactory.Options opt = new BitmapFactory.Options();
opt.inMutable = true;
Bitmap imageBitmap = BitmapFactory.decodeResource(getResources(), icon,opt);
Bitmap resized = Bitmap.createScaledBitmap(imageBitmap, 80, 80, true);
canvas1.drawBitmap(resized, 40, 40, color);
canvas1.drawRoundRect(new RectF(30,-40,width+50,50),10,10, color);
canvas1.drawText(mapShowArrayList.get(i).getTitle(), 40, 40, wordcolor);
URLIMAGE = mapShowArrayList.get(i).getiConPicture();
MarkerOptions options = new MarkerOptions()
.draggable(false)
.icon(BitmapDescriptorFactory.fromBitmap(bmp))
.position(nowlocat);
marker = mMap.addMarker(options);
marker.showInfoWindow();
mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener()
@Override
public boolean onMarkerClick(Marker marker)
Toast.makeText(getContext(),info, Toast.LENGTH_SHORT).show();
return false;
);
catch (JSONException e)
e.printStackTrace();
progressDialog.dismiss();
,
new Response.ErrorListener()
@Override
public void onErrorResponse(VolleyError error)
progressDialog.dismiss();
Toast.makeText(getActivity(), "Error Reading Detail. " + error.toString() , Toast.LENGTH_SHORT).show();
);
RequestQueue requestQueue = Volley.newRequestQueue(getActivity());
requestQueue.add(stringRequest);
下面一行可以得到正确的日期
final String info = mapShowArrayList.get(i).getTitle()
但是在那里，我总是得到最后一个日期。
mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener()
@Override
public boolean onMarkerClick(Marker marker)
Toast.makeText(getContext(),info, Toast.LENGTH_SHORT).show();
return false;
);
无法在mMap.setOnMarkerClickListener 中获取值 i
for (int i = 0; i < jsonArray.length(); i++)
JSONObject mapShow = jsonArray.getJSONObject(i);
mapShowArrayList.add(new MapShow(
mapShow.getInt("MapID"),
mapShow.getInt("UserID"),
mapShow.getString("MapLat"),
mapShow.getString("MapLng"),
mapShow.getString("MapTitle"),
mapShow.getString("MapPhoto"),
mapShow.getInt("MapType")
));
//double nowLocation = Double.compare(mapShowArrayList.get(i).getMapLatLng());
//ObjectList A[0] =
info = mapShowArrayList.get(i).getTitle();
Log.d("INFO", info);
mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener()
@Override
public boolean onMarkerClick(Marker marker)
Toast.makeText(getContext(), mapShowArrayList.get(i).getTitle(), Toast.LENGTH_SHORT).show();
return false;
);
error: local variables referenced from an inner class must be final or effectively final
Toast.makeText(getContext(), mapShowArrayList.get(i).getTitle(), Toast.LENGTH_SHORT).show();
CustomObject.java
public class CustomObject
private int MapID;
private int UserID;
private String Lat;
private String Lng;
private String title;
private String iConPicture;
private int Mtype;
public CustomObject(String title)
this.title = title;
public CustomObject()
public int getMapID()
return MapID;
public void setMapID(int mapID)
MapID = mapID;
public int getUserID()
return UserID;
public void setUserID(int userID)
UserID = userID;
public String getLat()
return Lat;
public void setLat(String lat)
Lat = lat;
public String getLng()
return Lng;
public void setLng(String lng)
Lng = lng;
public String getTitle()
return title;
public void setTitle(String title)
this.title = title;
public String getiConPicture()
return iConPicture;
public void setiConPicture(String iConPicture)
this.iConPicture = iConPicture;
public int getMtype()
return Mtype;
public void setMtype(int mtype)
Mtype = mtype;
我使用这种方法，我会在空对象引用上得到错误 com.stanley.ifunpot.models.CustomObject.getTitle()'
代码
private CustomObject customObject;
MarkerOptions options = new MarkerOptions().draggable(false).title(customObject.getTitle()).icon(BitmapDescriptorFactory.fromBitmap(bmp)) .position(nowlocat);
marker = mMap.addMarker(options);
marker.setTag(new CustomObject(MAP_ID,MapLat,MapLng,MapTitle,MapPhoto,MapType));
marker.showInfoWindow();
mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener()
@Override
public boolean onMarkerClick(Marker marker)
CustomObject data = (CustomObject) marker.getTag();
Toast.makeText(getContext(),String.valueOf(data.getMtype()), Toast.LENGTH_SHORT).show();
return false;
);
【问题讨论】：
是info 与mapShow.getString("MapTitle") 中的值相同吗？
是的，我可以从 mapShow.getString("MapTitle") 中获取值，但是当我将 mapShowArrayList.get(i).getTitle() 放入 mMap.setOnMarkerClickListener 时会出错
【参考方案1】：
MarkerOptions options = new MarkerOptions().draggable(false).title("Marker Title").icon(BitmapDescriptorFactory.fromBitmap(bmp)) .position(nowlocat);
marker = mMap.addMarker(options);
marker.setTag(new CustomObject());
marker.showInfoWindow();
在检索它时，您可以尝试以下操作：-
mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener()
@Override
public boolean onMarkerClick(Marker marker)
CustomObject data = (CustomObject) amarker.getTag();
Toast.makeText(getContext(),data.getInfo(), Toast.LENGTH_SHORT).show();
return false;
);
您可以在其中取出 info、latitude、longitude 等 CustomObject 内的所有需要的东西，然后如图所示检索。
【讨论】：
需要创建新的 CustomObject 类吗？ @Nadeem Shaikh @Stanley 是的，创建任何自定义对象并填充您需要与标记关联的所有必需内容。 最后一个问题，如何在google map中始终显示每个marker的标题？ @Stanley 现在检查代码。初始化时可以设置标记的标题MarkerOptions
我设置了 "MarkerOptions options = new MarkerOptions().draggable(false).title(mapShowArrayList.get(i).getTitle()).icon(BitmapDescriptorFactory.fromBitmap(bmp)) .position (nowlocat);"，但它只显示最后一个标记标题【参考方案2】：
private CustomObject customObject = new CustomObject(MAP_ID,MapLat,MapLng,MapTitle,MapPhoto,MapType);
MarkerOptions options = new MarkerOptions().draggable(false).title(customObject.getTitle()).icon(BitmapDescriptorFactory.fromBitmap(bmp)) .position(nowlocat);
marker = mMap.addMarker(options);
marker.setTag(customObject);
marker.showInfoWindow();
mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener()
@Override
public boolean onMarkerClick(Marker marker)
CustomObject data = (CustomObject) marker.getTag();
Toast.makeText(getContext(),String.valueOf(data.getMtype()), Toast.LENGTH_SHORT).show();
return false;
);
在你的代码中这样做！
【讨论】：
请在评论下查看 请看图 您的要求是什么？我认为它按预期工作 嗨，兄弟；你能检查我的新问题吗，请***.com/questions/64655328/… 你确定我会检查以上是关于为啥我不能从数组中得到正确的日期？的主要内容，如果未能解决你的问题，请参考以下文章
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