我正在实现具有旋转器的自定义图。旋转器带有用户名。单击旋转器中所选项目后，我想在地图中固定它的位置。但不幸的是，我只得到用户名。我想获取所有用户名，当我单击该特定的用户名时，以显示地图中的所有数组subsult的内容。这是我的JSON：
{
"result" :[
{
"username":"sinsiri",
"subresult":[
{
"latitude":"13.088847376649245",
"longitude":"121.0535496566772",
"province":"Mindoro"
},
{
"latitude":"14.898346071682198",
"longitude":"121.42616213302608",
"province":"General nakar"
}
]
},
{
"username":"qwerty",
"subresult":[
{
"latitude":"6.984796116278719",
"longitude":"122.02642351890961",
"province":"Zamboanga"
}
]
},
{
"username":"asd",
"subresult":[
{
"latitude":"16.229997551983594",
"longitude":"120.52623997214562",
"province":"Baguio"
}
]
}
]
在Android中的Jsonarray中提供我的代码
public class MapsFlagActivity extends FragmentActivity implements OnMapReadyCallback,LocationListener,GoogleMap.OnMarkerClickListener, Spinner.OnItemSelectedListener {
private GoogleMap mMap;
public static final String URL= BASE_URL +"location.php";
private JSONArray results;
public String alat, blong;
ProgressDialog pd;
public String lat;
public String lon;
//Declaring an Spinner
public Spinner spinner;
//An ArrayList for Spinner Items
public ArrayList<String> students;
//JSON Array
public JSONArray result;
//TextViews to display details
public TextView textViewLatitude, latview, lonview, proview;
public TextView textViewLongitude;
public TextView textViewProvince;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps_flag);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
final Button refresh = findViewById(R.id.refresh);
final Button showall = findViewById(R.id.showall);
//Initializing the ArrayList
students = new ArrayList<>();
//Initializing Spinner
spinner = findViewById(R.id.spinner);
//Adding an Item Selected Listener to our Spinner
//As we have implemented the class Spinner.OnItemSelectedListener to this class itself we are passing this to setOnItemSelectedListener
spinner.setOnItemSelectedListener(this);
//Initializing TextViews
textViewLatitude = findViewById(R.id.textViewLatitude);
textViewLongitude = findViewById(R.id.textViewLongitude);
textViewProvince = findViewById(R.id.textViewProvince);
latview = findViewById(R.id.latview);
lonview = findViewById(R.id.lonview);
proview = findViewById(R.id.proview);
refresh.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
SpotsDialog dialog = new SpotsDialog(MapsFlagActivity.this, R.style.Refresh);
dialog.show();
//This method will fetch the data from the URL
getData();
dialog.dismiss();
}
});
}
public void getData(){
textViewLatitude.setVisibility(View.VISIBLE);
textViewLongitude.setVisibility(View.VISIBLE);
textViewProvince.setVisibility(View.VISIBLE);
latview.setVisibility(View.VISIBLE);
lonview.setVisibility(View.VISIBLE);
proview.setVisibility(View.VISIBLE);
//Creating a string request
StringRequest stringRequests = new StringRequest(Config.DATA_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
JSONObject jo = null;
try {
//Parsing the fetched Json String to JSON Object
jo = new JSONObject(response);
//Storing the Array of JSON String to our JSON Array
result = jo.getJSONArray(Config.JSON_ARRAY);
//Calling method getStudents to get the students from the JSON Array
getAnimals(result);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
//Creating a request queue
RequestQueue requestQueue2 = Volley.newRequestQueue(this);
//Adding request to the queue
requestQueue2.add(stringRequests);
}
public void getAnimals(JSONArray ja){
//Traversing through all the items in the json array
for(int i=0;i<ja.length();i++){
try {
//Getting json object
JSONObject json = ja.getJSONObject(i);
//Adding the name of the student to array list
students.add(json.getString(Config.TAG_COMMONNAME));
} catch (JSONException e) {
e.printStackTrace();
}
}
//Setting adapter to show the items in the spinner
spinner.setAdapter(new ArrayAdapter<>(MapsFlagActivity.this, android.R.layout.simple_list_item_1, students));
}
//Method to get student name of a particular position
public String getLatitude(int position){
String name="";
try {
//Getting object of given index
JSONObject json = result.getJSONObject(position);
Toast.makeText(MapsFlagActivity.this, "Selected: " + spinner.getItemAtPosition(position), Toast.LENGTH_LONG).show();
//Fetching name from that object
name = json.getString(Config.TAG_LATITUDE);
} catch (JSONException e) {
e.printStackTrace();
}
//Returning the name
return name;
}
//Doing the same with this method as we did with getName()
public String getLongitude(int position){
String course="";
try {
JSONObject json = result.getJSONObject(position);
course = json.getString(Config.TAG_LONGITUDE);
} catch (JSONException e) {
e.printStackTrace();
}
return course;
}
//Doing the same with this method as we did with getName()
public String getProvince(int position){
String session="";
try {
JSONObject json = result.getJSONObject(position);
session = json.getString(Config.TAG_PROVINCE);
} catch (JSONException e) {
e.printStackTrace();
}
return session;
}
//this method will execute when we pic an item from the spinner
@Override
public void onItemSelected(AdapterView<?> parent, View view, final int position, long id) {
//Setting the values to text views for a selected item
textViewLatitude.setText(getLatitude(position));
textViewLongitude.setText(getLongitude(position));
textViewProvince.setText(getProvince(position));
try {
lat = String.valueOf(textViewLatitude.getText().toString());
lon = String.valueOf(textViewLongitude.getText().toString());
mMap.clear();
}catch(NumberFormatException e) {
e.printStackTrace();
}
mMap.addMarker(new MarkerOptions()
.position(new LatLng(Double.parseDouble(lat), Double.parseDouble(lon)))
//.title(Double.valueOf(lat_i).toString() + "," + Double.valueOf(long_i).toString())
.title(spinner.getSelectedItem().toString())
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_CYAN))
);
}
//When no item is selected this method would execute
@Override
public void onNothingSelected(AdapterView<?> parent) {
textViewLatitude.setText("");
textViewLongitude.setText("");
textViewProvince.setText("");
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Add a marker in Sydney and move the camera
/*LatLng sydney = new LatLng(-34, 151);
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));*/
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(13.088847376649245,121.0535496566772), 6.0f));
}
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
@Override
public void onProviderEnabled(String s) {
}
@Override
public void onProviderDisabled(String s) {
}
@Override
public boolean onMarkerClick(Marker marker) {
return false;
}
}
HERS SPINNER的另一代码
公共类配置{
//JSON URL
public static final String DATA_URL = BASE_URL + "locationflag.php";
//Tags used in the JSON String
public static final String TAG_COMMONNAME= "commonname";
public static final String TAG_LATITUDE = "latitude";
public static final String TAG_LONGITUDE = "longitude";
public static final String TAG_PROVINCE = "province";
//JSON array name
public static final String JSON_ARRAY = "result";
}
这不是副本和粘贴解决方案，而是带有刻度和代码的思想列车，可以帮助您解决需要自定义适配器的类似问题。
"我只获取用户名。我想获取JSON中所有用户的名称和所有子分子数组的内容"
- 您需要创建一个名为Student的Pojo类
`导入java.util.arraylist;
public class Student {
private String username;
private ArrayList<Subresult> subresult;
public Student(String username, ArrayList<Subresult> subresult) {
this.username = username;
this.subresult = subresult;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public ArrayList<Subresult> getSubresult() {
return subresult;
}
public void setSubresult(ArrayList<Subresult> subresult) {
this.subresult = subresult;
}
public static class Subresult {
private String latitude;
private String longitude;
private String province;
public String getLatitude() {
return latitude;
}
public void setLatitude(String latitude) {
this.latitude = latitude;
}
public String getLongitude() {
return longitude;
}
public void setLongitude(String longitude) {
this.longitude = longitude;
}
public String getProvince() {
return province;
}
public void setProvince(String province) {
this.province = province;
}
}
}
- 更新get -student方法以包括丢失的子收益
`旋转器旋转器；
ArrayList<Student> students = new ArrayList<>();
public void getStudents(JSONArray ja) {
for (int i = 0; i < ja.length(); i++) {
try {
//Getting json object
JSONObject json = ja.getJSONObject(i);
JSONArray subresults = json.getJSONArray(Config.SUBRESULTS);
for (int ii = 0; ii < subresults.length(); ii++) {
JSONObject json_data = subresults.getJSONObject(ii);
String latitude = json_data.getString("latitude");
String longitude = json_data.getString("longitude");
String province = json_data.getString("province");
// Adding the student object with name and subresult array to student array list
students.add(new Student(json.getString(Config.TAG_USERNAME), new Student.Subresult(latitude, longitude, province));
}
} catch (JSONException e) {
e.printStackTrace();
}
}
// Create an adapter named 'StudentAdapter' set custom adapter to the spinner
spinner.setAdapter(new StudentAdapter(students, context));
}`
- 创建自定义学生适配器
ps：请查找我用过的任何术语，您与您不熟悉，愉快的编码。