这是从json对象
获取数据的ma java代码
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.SharedPreferences;
import android.database.sqlite.SQLiteDatabase;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class OutboxActivity extends Activity {
// Progress Dialog
private ProgressDialog pDialog;
// Creating JSON Parser object
JSONParser jsonParser = new JSONParser();
ArrayList<HashMap<String, String>> outboxList;
/*************************************************************************************************/
List<String> too = new ArrayList<String>();
List<String> sub = new ArrayList<String>();
List<String> datel = new ArrayList<String>();
/**********************************************************************/
// products JSONArray
JSONArray outbox = null;
// Outbox JSON url
private static final String OUTBOX_URL = "http://www.bitfutura.in/outbox123.json";
// ALL JSON node names
private static final String TAG_MESSAGES = "messages";
private static final String TAG_ID = "id";
private static final String TAG_TO = "to";
private static final String TAG_SUBJECT = "subject";
private static final String TAG_DATE = "date";
SQLiteDatabase dbs;
ListView list;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dbs=openOrCreateDatabase("mycar.db",MODE_PRIVATE,null);
dbs.execSQL("create table if not exists Outbox(id varchar,top varchar,subject varchar,messsage" +
" varchar,date varchar)");
// Hashmap for ListView
outboxList = new ArrayList<HashMap<String, String>>();
// Loading OUTBOX in Background Thread
new LoadOutbox().execute();
}
/**
* Background Async Task to Load all OUTBOX messages by making HTTP Request
* */
class LoadOutbox extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(OutboxActivity.this);
pDialog.setMessage("Loading Outbox ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting Outbox JSON
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jsonParser.makeHttpRequest(OUTBOX_URL, "GET",
params);
// Check your log cat for JSON reponse
Log.d("Outbox JSON: ", json.toString());
try {
outbox = json.getJSONArray(TAG_MESSAGES);
// looping through All messages
dbs.execSQL("DELETE FROM Outbox");
for (int i = 0; i < outbox.length(); i++) {
JSONObject c = outbox.getJSONObject(i);
/***************************************************/
/************************************************/
// Storing each json item in variable
String id = c.getString(TAG_ID);
String to = c.getString(TAG_TO);
String subject = c.getString(TAG_SUBJECT);
String date = c.getString(TAG_DATE);
/****************************************************************/
too.add(to);
sub.add(subject);
datel.add(date);
/*********************************************************************/
String shu="'"+id+"','"+to+"','"+subject+"','"+date+"','"+date+"'";
dbs.execSQL("insert into Outbox values("+shu+")");
// subject taking only first 23 chars
// to fit into screen
if(subject.length() > 23){
subject = subject.substring(0, 22) + "..";
}
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_ID, id);
map.put(TAG_TO, to);
map.put(TAG_SUBJECT, subject);
map.put(TAG_DATE, date);
// adding HashList to ArrayList
outboxList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
String[] toa = new String[too.size()];
toa = too.toArray(toa);
String[] suba = new String[sub.size()];
suba = sub.toArray(suba);
String[] datea = new String[datel.size()];
datea = datel.toArray(datea);
/*
ListAdapter adapter = new SimpleAdapter(
OutboxActivity.this, outboxList,
R.layout.outbox_list_item, new String[] { TAG_SUBJECT, TAG_TO, TAG_DATE },
new int[] { R.id.subject, R.id.to, R.id.date });
// updating listview
setListAdapter(adapter);
*/
EventAdapter adapter=new EventAdapter(OutboxActivity.this,toa,suba,datea);
list=(ListView)findViewById(R.id.list);
list.setAdapter(adapter);
try {
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
int Slecteditem = position;
Toast.makeText(getApplicationContext(), Slecteditem, Toast.LENGTH_SHORT).show();
}
});
}catch(Exception ae)
{
Toast.makeText(getApplicationContext(),ae.getMessage(), Toast.LENGTH_LONG).show();
}
}
});
}
}
}
这是我的事件适配器类
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class EventAdapter extends ArrayAdapter<String> {
private final Activity context;
private final String[] itemname;
private final String[] itemname2;
private final String[] itemname3;
public EventAdapter(Activity context, String[] itemname,String[] itemname3,String[] itemname2) {
super(context, R.layout.myevent, itemname);
// TODO Auto-generated constructor stub
this.context=context;
this.itemname=itemname;
this.itemname3=itemname3;
this.itemname2=itemname2;
}
public View getView(int position,View view,ViewGroup parent) {
LayoutInflater inflater=context.getLayoutInflater();
View rowView=inflater.inflate(R.layout.myevent, null, true);
TextView txtTitle = (TextView) rowView.findViewById(R.id.item);
TextView extratxt1 = (TextView) rowView.findViewById(R.id.textView1);
TextView extratxt2 = (TextView) rowView.findViewById(R.id.textView2);
txtTitle.setText(itemname[position]);
extratxt1.setText(itemname2[position]);
extratxt2.setText(itemname3[position]);
return rowView;
};
}
这是我的用于列表视图的Activitymain xml代码
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="${relativePackage}.${activityClass}" >
<ListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</RelativeLayout>
列表视图成功获取更新但是当我单击列表视图中显示吐司的选项时，我单击它的位置显示错误
android.content.res.Resources$NotFoundException: String resource ID #0x2
at android.content.res.Resources.getText(Resources.java:274)
at android.widget.Toast.makeText(Toast.java:277)
at com.dk.sample.folder.residemenu.OutboxActivity$LoadOutbox$1$1.onItemClick(OutboxActivity.java:200)
at android.widget.AdapterView.performItemClick(AdapterView.java:300)
at android.widget.AbsListView.performItemClick(AbsListView.java:1143)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:3044)
at android.widget.AbsListView.onTouchUp(AbsListView.java:3845)
at android.widget.AbsListView.onTouchEvent(AbsListView.java:3617)
at android.view.View.dispatchTouchEvent(View.java:8388)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2424)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2158)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2172)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2172)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2172)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2172)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2314)
at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1692)
at android.app.Activity.dispatchTouchEvent(Activity.java:2739)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2275)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2172)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
答案 0 :(得分：3)
int Slecteditem = position;
Toast.makeText(getApplicationContext(), Slecteditem, Toast.LENGTH_SHORT).show();
您正在使用message参数的项目位置。 Toast不知道你的适配器并且认为你给它一个字符串资源ID，但是找不到具有该ID的字符串（在这种情况下是2）。您需要使用实际的字符串资源ID或实际的String。
由于您的适配器扩展了ArrayAdapter，您可以使用adapter.getItem(position)代替（我怀疑您打算这样做）。