Java Android-等待截击响应以继续
我构建了一个应用程序,它在地图中加载标记,我在截取JSON文件时得到的标记,但我首先需要它来加载截取,然后在继续执行代码后,因为另一种方式是使用latLng null向我显示错误,该参数加载不快,另一个方法首先执行并向我显示null 我的负载标记截击代码Java Android-等待截击响应以继续,java,android,geofire,Java,Android,Geofire,我构建了一个应用程序,它在地图中加载标记,我在截取JSON文件时得到的标记,但我首先需要它来加载截取,然后在继续执行代码后,因为另一种方式是使用latLng null向我显示错误,该参数加载不快,另一个方法首先执行并向我显示null 我的负载标记截击代码 public void getMarkers(){ requestQueue = Volley.newRequestQueue(getApplicationContext()); JsonObjectRequest json
public void getMarkers(){
requestQueue = Volley.newRequestQueue(getApplicationContext());
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, url, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
JSONArray saagTracker = response.getJSONArray("saagMRK");
for (int i = 0; i < saagTracker.length(); i++) {
JSONObject object = saagTracker.getJSONObject(i);
title = object.getString(TITLE);
snnipet = object.getString(SNNIP);
latLng = new LatLng(Double.parseDouble(object.getString(LAT)), Double.parseDouble(object.getString(LNG)));
coor = coor + "|" + object.getString(LAT) + "," + object.getString(LNG); // Menambah data marker untuk di tampilkan ke google map
addMarker(latLng, title, snnipet);
}
} catch (JSONException e) {
e.printStackTrace();
}
//JSONArray array = new JSONArray(response.body().string());
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this, "Ocurrio un error", Toast.LENGTH_LONG).show();
}
});
requestQueue.add(jsonObjectRequest);
}
您需要为截击响应实现回调。下面是一个非常简单的方法 步骤1:创建此接口
public interface VolleyCallBack {
void onSuccess();
}
步骤2:将getMarkers()
方法更改为:
public void getMarkers(final VolleyCallBack callBack){
requestQueue = Volley.newRequestQueue(getApplicationContext());
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, url, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
JSONArray saagTracker = response.getJSONArray("saagMRK");
for (int i = 0; i < saagTracker.length(); i++) {
JSONObject object = saagTracker.getJSONObject(i);
title = object.getString(TITLE);
snnipet = object.getString(SNNIP);
latLng = new LatLng(Double.parseDouble(object.getString(LAT)), Double.parseDouble(object.getString(LNG)));
coor = coor + "|" + object.getString(LAT) + "," + object.getString(LNG); // Menambah data marker untuk di tampilkan ke google map
addMarker(latLng, title, snnipet);
callback.onSuccess();
}
} catch (JSONException e) {
e.printStackTrace();
}
//JSONArray array = new JSONArray(response.body().string());
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this, "Ocurrio un error", Toast.LENGTH_LONG).show();
}
});
requestQueue.add(jsonObjectRequest);
}
什么时候在geofire参数的前面调用
getMarkers()
?在调用geofire.queryLocation()
之前调用onCreate?在前面调用yes:getMarkers()代码>geoQuery=geofire.QueryAtology(新地理位置(纬度、经度),0.1f)代码>非常感谢您的帮助
public void getMarkers(final VolleyCallBack callBack){
requestQueue = Volley.newRequestQueue(getApplicationContext());
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, url, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
JSONArray saagTracker = response.getJSONArray("saagMRK");
for (int i = 0; i < saagTracker.length(); i++) {
JSONObject object = saagTracker.getJSONObject(i);
title = object.getString(TITLE);
snnipet = object.getString(SNNIP);
latLng = new LatLng(Double.parseDouble(object.getString(LAT)), Double.parseDouble(object.getString(LNG)));
coor = coor + "|" + object.getString(LAT) + "," + object.getString(LNG); // Menambah data marker untuk di tampilkan ke google map
addMarker(latLng, title, snnipet);
callback.onSuccess();
}
} catch (JSONException e) {
e.printStackTrace();
}
//JSONArray array = new JSONArray(response.body().string());
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this, "Ocurrio un error", Toast.LENGTH_LONG).show();
}
});
requestQueue.add(jsonObjectRequest);
}
getMarkers(new VolleyCallBack() {
@Override
public void onSuccess() {
// this is where you will call the geofire, here you have the response from the volley.
geoQuery = geofire.queryAtLocation(new GeoLocation(latLng.latitude, latLng.longitude),0.1f);
});