我的代码有问题。我将数据从一个活动传递到另一个活动，没有问题，但是当我尝试显示时间表是从微调器中选择时，它给了我索引超出范围的异常
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.sql.Time;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserFactory;
import android.app.AlertDialog;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.graphics.Color;
import android.support.v4.view.PagerTabStrip;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
public class TimetableMainActivity extends AppCompatActivity {
final String[] page_titles = new String[]{"Mon", "Tue", "Wed", "Thu", "Fri"};
final String[] hours = new String[]{"9", "10", "11", "noon", "1", "2", "3", "4", "5", "6"};
private String[][] days;
private int pos;
private String source = null;
public static ArrayList<String> schedule = new ArrayList<String>();
List<Map<String, String>>[] list = new List[5]; // Mon - Fri
Map<String, String> map;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (!isNetworkAvailable())
new AlertDialog.Builder(TimetableMainActivity.this).
setTitle("Error").setMessage("No Network Connection").
setNeutralButton("Close", null).show();
else {
new GetXML().execute("");
}
}
public boolean isNetworkAvailable() {
ConnectivityManager cm = (ConnectivityManager)
getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = cm.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected())
return true;
else
return false;
}
private class GetXML extends AsyncTask<String, Void, String> {
String src = null;
@Override
protected String doInBackground(String... params) {
Bundle extras = getIntent().getExtras();
source = extras.getString("Name");
try {
URL url = new URL(source);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
src = readStream(con.getInputStream());
} catch (Exception e) {
e.printStackTrace();
}
return src;
}
@Override
protected void onPostExecute(String result) {
if (src == null)
new AlertDialog.Builder(TimetableMainActivity.this).
setTitle("Error").setMessage("No Schedule Found").
setNeutralButton("Close", null).show();
else parseXML(src);
setContentView(R.layout.activity_main_timetable);
days = new String[5][10];
for (int i = 0; i < 5; i++) {
for (int j = 0; j < 10; j++) {
int k = i * 10 + j;
days[i][j] = schedule.get(k);
}
}
for (int i = 0; i < 5; i++)
list[i] = new ArrayList<Map<String, String>>();
int count = hours.length;
for (int j = 0; j < 5; j++) {
for (int i = 0; i < count; i++) {
map = new HashMap<String, String>();
map.put("time", hours[i]);
map.put("description", days[j][i]);
list[j].add(map);
}
}
Calendar cal = Calendar.getInstance();
int today = cal.get(Calendar.DAY_OF_WEEK) - 2;
pos = 0;
if (today >= 0 && today <= 4)
pos = today;
ViewPager viewPager = findViewById(R.id.ViewPager);
CustomPagerAdapter adapter = new CustomPagerAdapter(TimetableMainActivity.this, list);
PagerTabStrip pagerTabStrip = findViewById(R.id.pager_tab);
int color = Color.parseColor("#33b7ee");
pagerTabStrip.setTabIndicatorColor(color);
viewPager.setAdapter(adapter);
viewPager.setCurrentItem(pos);
}
@Override
protected void onPreExecute() {
}
@Override
protected void onProgressUpdate(Void... values) {
}
}
public void parseXML(String src) {
try {
StringReader sr = new StringReader(src);
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
factory.setNamespaceAware(true);
XmlPullParser xpp = factory.newPullParser();
xpp.setInput(sr);
int token = xpp.getEventType();
while (token != XmlPullParser.END_DOCUMENT) {
if (token == XmlPullParser.START_TAG) {
if (xpp.getName().equals("cid")) {
token = xpp.nextToken();
if (xpp.getText() == null)
schedule.add("");
if (token == XmlPullParser.TEXT) {
schedule.add(xpp.getText());
}
}
}
token = xpp.nextToken();
}
} catch (Exception e) {
e.printStackTrace();
}
}
private String readStream(InputStream in) {
BufferedReader reader = null;
String line = null;
StringBuffer sb = new StringBuffer();
try {
reader = new BufferedReader(new InputStreamReader(in));
while ((line = reader.readLine()) != null) {
sb.append(line);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return sb.toString();
}
这是第二个活动，传递了第一个活动的数据，在这里：
public class ScheduleMainActivity extends AppCompatActivity {
final static String[] programs = { "Select Program", "Architectural",
"Civil", "Geomatics", "Computing Systems", "Biomedical",
"Instrumentation", "Electrical (Power)",
"Telecommunications", "Chemical Processing", "Industrial", "Mechanical",
"Manufacturing", "Petroleum" };
final static String[] years = { "Select Year", "First", "Second", "Third" };
String p = new String();
String y = new String();
String cid = new String();
String loc = new String();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_schedule);
Spinner spinner_p = (Spinner) findViewById(R.id.spinner_p);
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(ScheduleMainActivity.this,
R.layout.spinnerrow, R.id.spinner_id, programs);
spinner_p.setAdapter(arrayAdapter);
spinner_p.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
switch(pos) {
case 1 : cid = "ae"; break;
case 2 : cid = "ce"; break;
case 3 : cid = "ge"; break;
case 4 : cid = "cs"; break;
case 5 : cid = "eb"; break;
case 6 : cid = "ei"; break;
case 7 : cid = "ep"; break;
case 8 : cid = "te"; break;
case 9 : cid = "cp"; break;
case 10: cid = "in"; break;
case 11: cid = "me"; break;
case 12: cid = "mm"; break;
case 13: cid = "pe"; break;
default: break;
}
p = programs[pos];
}
public void onNothingSelected(AdapterView<?> parent) {
}
});
Spinner spinner_y = (Spinner) findViewById(R.id.spinner_y);
ArrayAdapter<String> y_arrayAdapter = new ArrayAdapter<String>(ScheduleMainActivity.this,
R.layout.spinnerrow, R.id.spinner_id, years);
spinner_y.setAdapter(y_arrayAdapter);
spinner_y.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
y = years[pos];
}
public void onNothingSelected(AdapterView<?> parent) {
}
});
final Button b = (Button) findViewById(R.id.schedule);
b.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if(v == b) {
if(event.getAction() == MotionEvent.ACTION_DOWN) {
v.setAlpha(.3f);
}
else {
v.setAlpha(1f);
}
}
return false;
}
});
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(p.equals("Select Program") || y.equals("Select Year"))
new AlertDialog.Builder(ScheduleMainActivity.this).
setTitle("Error").setMessage("No Program/Year selected").
setNeutralButton("Close", null).show();
else {
Calendar cal = Calendar.getInstance();
SimpleDateFormat monthFormat = new SimpleDateFormat("M");
String month_name = monthFormat.format(cal.getTime());
int month = Integer.parseInt(month_name);
int selectedYear = 0;
if(y.equals("First"))
selectedYear = 1;
else if(y.equals("Second"))
selectedYear = 2;
else if(y.equals("Third"))
selectedYear = 3;
int semester = 0;
if(month >= 9 && month <= 12) {
semester = 3 * selectedYear - 2;
}
else if(month >= 1 && month <= 4) {
semester = 3 * selectedYear - 1;
}
else {
semester = 3 * selectedYear;
}
StringBuffer sb = new StringBuffer();
sb.append("http://branko-cirovic.appspot.com/etcapp/timetables/timetable_"); sb.append(cid); sb.append(semester); sb.append(".xml");
loc = sb.toString();
Toast.makeText(ScheduleMainActivity.this,"You Selected : "
+ loc, Toast.LENGTH_SHORT).show();
Intent intent = new Intent(ScheduleMainActivity.this, TimetableMainActivity.class);
intent.putExtra("Name", loc);
startActivity(intent);
}
}
});
}
}
如果有人可以解决我的问题或告诉我如何解决它，请多多关照
最佳答案
所以问题实际上出在我试图传递给第二个活动的URL上，这是错误的。
现在，通过将“捆绑包”添加到第二个活动的try语句中，它已经可以正常工作