城市有2个自动完成文本视图，状态有1个。我希望当用户在自动完成文本视图中输入状态然后根据状态选择时，应自动填写城市自动填充文本视图。与电子商务应用程序一样，只要有人在地址部分输入邮政编码，城市和州就会自动填写，用户也可以选择。
main activity.Java
public class MainActivity extends AppCompatActivity {
EditText edtxt_name_address, edtxt_email_address, edtxt_mobile_address, edtxt_alt_mob_address, edtxt_pincode, edtxt_addline1, edtxt_addline2;
Button buttonSaveAddress;
AutoCompleteTextView edtxt_city, edtxt_state;
private static final String KEY_STATE = "state";
private static final String KEY_CITIES = "cities";
private ProgressDialog pDialog;
private String cities_url = "http://api.androiddeft.com/cities/cities_array.json";
final List<State> statesList = new ArrayList<>();
final List<String> states = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edtxt_city = findViewById(R.id.edtxt_city);
edtxt_state = findViewById(R.id.edtxt_state);
loadStateCityDetails();
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.select_dialog_item, states);
edtxt_state.setThreshold(1);//will start working from first character
edtxt_state.setAdapter(adapter);//setting the adapter data into the AutoCompleteTextView
//edtxt_city.setTextColor(Color.BLACK)
edtxt_state.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
buttonSaveAddress = findViewById(R.id.buttonSaveAddress);
buttonSaveAddress.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
saveAddress();
}
});
}
private void loadStateCityDetails() {
JsonArrayRequest jsArrayRequest = new JsonArrayRequest
(Request.Method.GET, cities_url, null, new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray responseArray) {
try {
//Parse the JSON response array by iterating over it
for (int i = 0; i < responseArray.length(); i++) {
JSONObject response = responseArray.getJSONObject(i);
String state = response.getString(KEY_STATE);
JSONArray cities = response.getJSONArray(KEY_CITIES);
List<String> citiesList = new ArrayList<>();
for (int j = 0; j < cities.length(); j++) {
citiesList.add(cities.getString(j));
}
statesList.add(new State(state, citiesList));
states.add(state);
Log.d("lskd", String.valueOf(statesList));
Log.d("lskd", String.valueOf(states));
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
//pDialog.dismiss();
//Display error message whenever an error occurs
Toast.makeText(getApplicationContext(),
error.getMessage(), Toast.LENGTH_SHORT).show();
}
});
// Access the RequestQueue through your singleton class.
MySingleton.getInstance(this).addToRequestQueue(jsArrayRequest);
}
private void saveAddress() {
if (TextUtils.isEmpty(city)) {
edtxt_city.setError("Please enter your City");
edtxt_city.requestFocus();
return;
}
if (TextUtils.isEmpty(state)) {
edtxt_state.setError("Please enter your State");
edtxt_state.requestFocus();
return;
}
Intent profile_next = new Intent(MainActivity.this, ProfileNextActivity.class);
startActivity(profile_next);
}
}
state.Java
public class State {
private String stateName;
private List<String> cities;
public State(String stateName, List<String> cities) {
this.stateName = stateName;
this.cities = cities;
}
public String getStateName() {
return stateName;
}
public List<String> getCities() {
return cities;
}
}
州与城市有一对多的关系，我没有特别明白自动填写的意思。如果要填充所选州的相关城市，请执行以下操作。
在你的edtxt_state.setOnItemSelectedListener里面
edtxt_state.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
statesList.get(position).getCities(); //get your cities from selected state
//set adapter or notify city list of your `edtxt_city` AutoCompleteTextView
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
试试这个...
edtxt_state.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
List<String> cityList = statesList.get(position).getCities();
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.select_dialog_item, cityList);
edtxt_city.setThreshold(1);//will start working from first character
edtxt_city.setAdapter(adapter);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
在获得loadStateCityDetails();之后，在stateList中设置适配器
statesList.add(new State(state, citiesList));
states.add(state);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.select_dialog_item, states);
edtxt_state.setThreshold(1);//will start working from first character
edtxt_state.setAdapter(adapter);
编辑
edtxt_state.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String selection = (String) parent.getItemAtPosition(position);
int pos = -1;
for (int i = 0; i < statesList.size(); i++) {
if (statesList.get(i).getStateName().equals(selection)) {
pos = i;
break;
}
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.select_dialog_item, statesList.get(pos).getCities());
edtxt_city.setThreshold(1);//will start working from first character
edtxt_city.setAdapter(adapter);//setting the adapter data into the AutoCompleteTextView
}
});
你必须得到stateList
如上所述设置城市适配器