我想在包含价格和文字的动态列表视图中添加复选框。当iam尝试添加复选框操作时，该列表正确显示，显示胎儿错误。
这是代码....请提前感谢帮我解决这个问题。
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.CheckedTextView;
import android.widget.CompoundButton;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
class AdapterMenuList extends BaseAdapter {
private Activity activity;
ArrayList<AdapterMenuList> objects;
boolean box;
public AdapterMenuList(Activity act) {
this.activity = act;
}
public int getCount() {
// TODO Auto-generated method stub
return ActivityMenuList.sub_service_id.size();
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
AdapterMenuList getAdapterMenuList(int position) {
return ((AdapterMenuList) getItem(position));
}
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder;
AdapterMenuList p = getAdapterMenuList(position);
if(convertView == null){
LayoutInflater inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.menu_list_item, null);
holder = new ViewHolder();
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.txtText = (TextView) convertView.findViewById(R.id.txtText);
holder.txtSubText = (TextView) convertView.findViewById(R.id.txtSubText);
holder.ch = (CheckBox)convertView.findViewById(R.id.checkBox);
holder.txtText.setText(ActivityMenuList.sub_service_name.get(position));
holder.txtSubText.setText(ActivityMenuList.price.get(position)+" "+ ActivityMenuList.Currency);
holder.ch.setTag(position);
holder.ch.setChecked(p.box);
holder.ch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
getAdapterMenuList((Integer) buttonView.getTag()).box = isChecked;
}
});
return convertView;
}
ArrayList<AdapterMenuList> getBox() {
ArrayList<AdapterMenuList> box = new ArrayList<AdapterMenuList>();
for (AdapterMenuList p : objects) {
if (p.box)
box.add(p);
}
return box;
}
static class ViewHolder {
TextView txtText;
TextView txtSubText;
CheckBox ch;
}
}
public class ActivityMenuList extends Activity {
ListView listMenu;
ProgressBar prgLoading;
//TextView txtTitle;
EditText edtKeyword;
ImageButton btnSearch;
TextView txtAlert;
// declare static variable to store tax and currency symbol
static double Tax;
static String Currency;
// declare adapter object to create custom menu list
AdapterMenuList mla;
// create arraylist variables to store data from server
static ArrayList<Long> sub_service_id = new ArrayList<Long>();
static ArrayList<String> sub_service_name = new ArrayList<String>();
static ArrayList<Double> price = new ArrayList<Double>();
String MenuAPI;
String TaxCurrencyAPI;
int IOConnect = 0;
long service_id;
String service_name;
String Keyword;
// create price format
DecimalFormat formatData = new DecimalFormat("#.##");
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.menu_list);
ActionBar bar = getActionBar();
bar.setBackgroundDrawable(new ColorDrawable(getResources().getColor(R.color.header)));
bar.setTitle("Product");
bar.setDisplayHomeAsUpEnabled(true);
bar.setHomeButtonEnabled(true);
prgLoading = (ProgressBar) findViewById(R.id.prgLoading);
listMenu = (ListView) findViewById(R.id.listMenu);
edtKeyword = (EditText) findViewById(R.id.edtKeyword);
btnSearch = (ImageButton) findViewById(R.id.btnSearch);
txtAlert = (TextView) findViewById(R.id.txtAlert);
// menu API url
MenuAPI = Constant.MenuAPI+"?accesskey="+Constant.AccessKey+"&service_id=";
// tax and currency API url
TaxCurrencyAPI = Constant.TaxCurrencyAPI+"?accesskey="+Constant.AccessKey;
// get category id and category name that sent from previous page
Intent iGet = getIntent();
service_id = iGet.getLongExtra("service_id",0);
service_name = iGet.getStringExtra("service_name");
MenuAPI += service_id;
// set category name to textview
// txtTitle.setText(Category_name);
mla = new AdapterMenuList(ActivityMenuList.this);
// call asynctask class to request tax and currency data from server
new getTaxCurrency().execute();
// event listener to handle search button when clicked
btnSearch.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// TODO Auto-generated method stub
// get keyword and send it to server
try {
Keyword = URLEncoder.encode(edtKeyword.getText().toString(), "utf-8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
MenuAPI += "&keyword="+Keyword;
IOConnect = 0;
listMenu.invalidateViews();
clearData();
new getDataTask().execute();
}
});
// event listener to handle list when clicked
listMenu.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3) {
// TODO Auto-generated method stub
// go to menu detail page
String result = "Selected Product are :";
for (AdapterMenuList p : mla.getBox()) {
if (p.box){
result += "\n" + sub_service_name;
}
}
Toast.makeText(ActivityMenuList.this, result+"Total Amount:=" + sub_service_name, Toast.LENGTH_LONG).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_category, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
switch (item.getItemId()) {
case R.id.cart:
// refresh action
Intent iMyOrder = new Intent(ActivityMenuList.this, ActivityMenuList.class);
startActivity(iMyOrder);
overridePendingTransition (R.anim.open_next, R.anim.close_next);
return true;
case R.id.refresh:
IOConnect = 0;
listMenu.invalidateViews();
clearData();
new getDataTask().execute();
return true;
case android.R.id.home:
// app icon in action bar clicked; go home
this.finish();
overridePendingTransition(R.anim.open_main, R.anim.close_next);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
// asynctask class to handle parsing json in background
public class getTaxCurrency extends AsyncTask<Void, Void, Void>{
// show progressbar first
getTaxCurrency(){
if(!prgLoading.isShown()){
prgLoading.setVisibility(0);
txtAlert.setVisibility(8);
}
}
@Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
// parse json data from server in background
parseJSONDataTax();
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
// when finish parsing, hide progressbar
prgLoading.setVisibility(8);
// if internet connection and data available request menu data from server
// otherwise, show alert text
if((Currency != null) && IOConnect == 0){
new getDataTask().execute();
}else{
txtAlert.setVisibility(0);
}
}
}
// method to parse json data from server
public void parseJSONDataTax(){
try {
// request data from tax and currency API
HttpClient client = new DefaultHttpClient();
HttpConnectionParams.setConnectionTimeout(client.getParams(), 15000);
HttpConnectionParams.setSoTimeout(client.getParams(), 15000);
HttpUriRequest request = new HttpGet(TaxCurrencyAPI);
HttpResponse response = client.execute(request);
InputStream atomInputStream = response.getEntity().getContent();
BufferedReader in = new BufferedReader(new InputStreamReader(atomInputStream));
String line;
String str = "";
while ((line = in.readLine()) != null){
str += line;
}
// parse json data and store into tax and currency variables
JSONObject json = new JSONObject(str);
JSONArray data = json.getJSONArray("data"); // this is the "items: [ ] part
JSONObject object_tax = data.getJSONObject(0);
JSONObject tax = object_tax.getJSONObject("tax_n_currency");
Tax = Double.parseDouble(tax.getString("Value"));
JSONObject object_currency = data.getJSONObject(1);
JSONObject currency = object_currency.getJSONObject("tax_n_currency");
Currency = currency.getString("Value");
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
IOConnect = 1;
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// clear arraylist variables before used
void clearData(){
sub_service_id.clear();
sub_service_name.clear();
price.clear();
}
// asynctask class to handle parsing json in background
public class getDataTask extends AsyncTask<Void, Void, Void>{
// show progressbar first
getDataTask(){
if(!prgLoading.isShown()){
prgLoading.setVisibility(0);
txtAlert.setVisibility(8);
}
}
@Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
// parse json data from server in background
parseJSONData();
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
// when finish parsing, hide progressbar
prgLoading.setVisibility(8);
// if data available show data on list
// otherwise, show alert text
if(sub_service_id.size() > 0){
listMenu.setVisibility(0);
listMenu.setAdapter(mla);
}else{
txtAlert.setVisibility(0);
}
}
}
// method to parse json data from server
public void parseJSONData(){
clearData();
try {
// request data from menu API
HttpClient client = new DefaultHttpClient();
HttpConnectionParams.setConnectionTimeout(client.getParams(), 15000);
HttpConnectionParams.setSoTimeout(client.getParams(), 15000);
HttpUriRequest request = new HttpGet(MenuAPI);
HttpResponse response = client.execute(request);
InputStream atomInputStream = response.getEntity().getContent();
BufferedReader in = new BufferedReader(new InputStreamReader(atomInputStream));
String line;
String str = "";
while ((line = in.readLine()) != null){
str += line;
}
// parse json data and store into arraylist variables
JSONObject json = new JSONObject(str);
JSONArray data = json.getJSONArray("data"); // this is the "items: [ ] part
for (int i = 0; i < data.length(); i++) {
JSONObject object = data.getJSONObject(i);
JSONObject menu = object.getJSONObject("Menu");
sub_service_id.add(Long.parseLong(menu.getString("sub_service_id")));
sub_service_name.add(menu.getString("sub_service_name"));
price.add(Double.valueOf(formatData.format(menu.getDouble("price"))));
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
//mla.imageLoader.clearCache();
listMenu.setAdapter(null);
super.onDestroy();
}
@Override
public void onConfigurationChanged(final Configuration newConfig)
{
// Ignore orientation change to keep activity from restarting
super.onConfigurationChanged(newConfig);
}
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
super.onBackPressed();
finish();
overridePendingTransition(R.anim.open_main, R.anim.close_next);
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#e7e7e7" >
<LinearLayout
android:id="@+id/lytSearch"
android:layout_width="fill_parent"
android:layout_height="45dp"
android:background="@color/header"
android:gravity="center_vertical"
android:visibility="visible" >
<EditText
android:id="@+id/edtKeyword"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:background="@drawable/search_form"
android:hint="@string/search"
android:padding="7dp"
android:textColor="@color/hint"
android:textSize="14sp"
android:inputType="text"
android:singleLine="true" />
<ImageButton
android:id="@+id/btnSearch"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:layout_weight="3"
android:background="@color/header"
android:src="@drawable/ic_search" />
</LinearLayout>
<ListView
android:visibility="gone"
android:id="@+id/listMenu"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/lytSearch"
android:divider="@null"
android:padding="5dp" />
<ProgressBar
android:id="@+id/prgLoading"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_centerInParent="true" />
<TextView
android:id="@+id/txtAlert"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/not_found"
android:textSize="14sp"
android:layout_centerInParent="true"
android:visibility="gone"/>
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#e7e7e7"
android:padding="5dp" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/button_top_style_1"
android:orientation="vertical"
android:padding="5dp" >
<RelativeLayout
android:id="@+id/lytText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp" >
<TextView
android:id="@+id/txtText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_toLeftOf="@+id/txtSubText"
android:maxLines="2"
android:text="aaa"
android:textSize="16sp" />
<TextView
android:id="@+id/txtSubText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:text="bbb" />
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="select"
android:id="@+id/checkBox"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:checked="false" />
</RelativeLayout>
</LinearLayout>
</RelativeLayout>
02-29 08:22:13.848 18814-18814/com.theredandblack.ecommerce E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.theredandblack.ecommerce, PID: 18814
java.lang.ClassCastException: java.lang.Integer cannot be cast to com.theredandblack.ecommerce.AdapterMenuList
at com.theredandblack.ecommerce.AdapterMenuList.getAdapterMenuList(AdapterMenuList.java:45)
at com.theredandblack.ecommerce.AdapterMenuList.getView(AdapterMenuList.java:50)
at android.widget.AbsListView.obtainView(AbsListView.java:2255)
at android.widget.ListView.measureHeightOfChildren(ListView.java:1263)
at android.widget.ListView.onMeasure(ListView.java:1175)
at android.view.View.measure(View.java:16497)
at android.widget.RelativeLayout.measureChild(RelativeLayout.java:689)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:473)
at android.view.View.measure(View.java:16497)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:16497)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:327)
at android.view.View.measure(View.java:16497)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2291)
at android.view.View.measure(View.java:16497)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1912)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1109)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1291)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5600)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
at android.view.Choreographer.doCallbacks(Choreographer.java:574)
at android.view.Choreographer.doFrame(Choreographer.java:544)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)
问题在于您的getAdapterMenuList(int position)方法。你正在返回((AdapterMenuList) getItem(position));，其中probablhy抛出一个ClassCastException，因为getItem返回一个你试图强制转换为AdapterMenuList的int