我正在开发一个应用程序，其中我需要从一个webservice填充微调器，并且还存在第二个微调器，它们在选择第一个微调器项后填充。第二个（微调器B）依赖于微调器A.我得到了A的列表但是b微调器有问题。
我的基本要求是当我选择微调器“A”的项目时，它将加载微调器“b”的所有项目 这里是代码::
package com.CaribPay;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;
import com.Setting.CustomParser;
public class Register2 extends Activity implements OnItemClickListener {
private Button BtnReg2Next;
private EditText EdtxReg2Streetadd1,
EdtxReg2Streetadd2,
EdtxReg2City,
EdtxReg2Zipcode;
private Spinner
SpnrReg2Contry,
SpnrReg2Agent,
SpnrReg2State,
SpnrReg2PrimaryCurr,
SpnrReg2SecondaryCurr;
private CustomParser cstParsr = new CustomParser();
private String[] Regstrationstep1;
private String[] strCountry,strProvince;
private String[] Primarysecondarycur;
private int globPosition;
private String strSelecteccontry;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.register2);
GetDataFromLastPage();
new FillSpinnerTask().execute();
}
private class FillSpinnerTask extends AsyncTask<Void, Void, Void> {
private ProgressDialog dialog = new ProgressDialog(
Register2.this);
@Override
protected void onPreExecute() {
this.dialog.setMessage(getString(R.string.MsgPleasewait));
this.dialog.show();
this.dialog.setCancelable(false);
// put your code which preload with processDialog
}
@Override
protected Void doInBackground(Void... arg0) {
// put your code here
strCountry = cstParsr.LoadCountriesForMobApp(getApplicationContext());
return null;
}
@Override
protected void onPostExecute(final Void unused) {
if (this.dialog.isShowing()) {
try {
this.dialog.dismiss();
this.dialog = null;
} catch (Exception e) {
e.printStackTrace();
}
if(strCountry != null)
{
for(int i=0;i<strCountry.length;i++)
{
Log.i("TAG","strCountry"+strCountry[i]);
}
}
FillView();
}
}
}
private void FillView() {
BtnReg2Next = (Button)findViewById(R.id.BtnReg2Next);
EdtxReg2Streetadd1 = (EditText)findViewById(R.id.EdtxReg2Streetadd1);
EdtxReg2Streetadd2= (EditText)findViewById(R.id.EdtxReg2Streetadd2);
EdtxReg2City = (EditText)findViewById(R.id.EdtxReg2City);
EdtxReg2Zipcode = (EditText)findViewById(R.id.EdtxReg2Zipcode);
SpnrReg2Contry = (Spinner)findViewById(R.id.SpnrReg2Contry);
SpnrReg2Agent = (Spinner)findViewById(R.id.SpnrReg2Agent);
SpnrReg2State = (Spinner)findViewById(R.id.SpnrReg2State);
SpnrReg2PrimaryCurr = (Spinner)findViewById(R.id.SpnrReg2PrimaryCurr);
SpnrReg2SecondaryCurr= (Spinner)findViewById(R.id.SpnrReg2SecondaryCurr);
if(strCountry != null)
{
ArrayAdapter languagelist = new ArrayAdapter(
Register2.this,
android.R.layout.simple_spinner_item,
strCountry);
languagelist.setDropDownViewResource(
android.R.layout.simple_spinner_dropdown_item);
SpnrReg2Contry.setAdapter(languagelist);
}
SpnrReg2Contry.setOnItemSelectedListener(new OnItemSelectedListener()
{
public void onItemSelected(AdapterView<?> parent, View view,
int position, long arg3)
{
strSelecteccontry = strCountry[position];
new FillProvinceSpinnerTask().execute();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
/*SpnrReg2State.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if(strProvince == null)
{
new FillProvinceSpinnerTask().execute();
}
return true;
}
});*/
BtnReg2Next.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if(EdtxReg2Streetadd1.getText().toString().equalsIgnoreCase("")|
EdtxReg2Streetadd2.getText().toString().equalsIgnoreCase("")|
EdtxReg2City.getText().toString().equalsIgnoreCase("")|
EdtxReg2Zipcode.getText().toString().equalsIgnoreCase(""))
{
Toast.makeText(getApplication(),getString(R.string.nullmessage),Toast.LENGTH_LONG).show();
}else
{
Intent Registration2 = new Intent(Register2.this,Register3.class);
startActivity(Registration2);
finish();
}
}
});
}
private void GetDataFromLastPage() {
// TODO Auto-generated method stub
Intent intent = getIntent();
Regstrationstep1 = new String[9];
Regstrationstep1 = intent.getStringArrayExtra("Regstrationstep1");
}
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int Pos, long arg3) {
// TODO Auto-generated method stub
}
private class FillProvinceSpinnerTask extends AsyncTask<Void, Void, Void> {
private ProgressDialog dialog = new ProgressDialog(
Register2.this);
@Override
protected void onPreExecute() {
this.dialog.setMessage(getString(R.string.MsgPleasewait));
this.dialog.show();
this.dialog.setCancelable(false);
// put your code which preload with processDialog
}
@Override
protected Void doInBackground(Void... arg0) {
// put your code here
strProvince = cstParsr.LoadProvinceFromCountryForMobApp(getApplicationContext(),strSelecteccontry);
return null;
}
@Override
protected void onPostExecute(final Void unused) {
if (this.dialog.isShowing()) {
try {
this.dialog.dismiss();
this.dialog = null;
} catch (Exception e) {
e.printStackTrace();
}
if(strProvince != null)
{
Primarysecondarycur = strProvince[0].split("~");
strProvince[0] = "Please Select a State";
ArrayAdapter languagelist = new ArrayAdapter(
Register2.this,
android.R.layout.simple_spinner_item,
strProvince);
languagelist.setDropDownViewResource(
android.R.layout.simple_spinner_dropdown_item);
SpnrReg2State.setAdapter(languagelist);
}
}
}
}
}
答案 0 :(得分：1)
OnItemSelectedListener的问题是它在声明时选择第一个值。为了避免第一次调用，请执行以下操作：
int count = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(...);
...
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
if(count>0) {
// do what you want on item selection
} else {
count++;
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
}