我编写了一个函数来计算距离并反射(reflect)在 ListView 中的 TextView 中。现在这给出了数组索引越界异常。这里可能出了什么问题。？因为其余代码之前曾给出结果，但添加此功能后，该应用程序崩溃了。
Route.java
public class Route extends Activity
{
ImageView exit, home, liveview, pinmap;
ArrayList<String> tolist;
ArrayList<String> distancelist;
List<String> greenl,bluel,redl,yellowl;
ListView list;
String Source,Destination;
Myadapter adapter;
MyDataBase mdb;
Integer[] dis=new Integer[97];
Integer[] disbetween=new Integer[97];
Boolean b=true;
Location mySourceLocation,myTargetLocation;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.routemap);
list=(ListView) findViewById(R.id.listView1);
tolist=new ArrayList<String>();
distancelist=new ArrayList<String>();
mdb=new MyDataBase(this);
mdb.open();
mySourceLocation=new Location("");
myTargetLocation=new Location("");
String[] stops = {
"Bangalore International Exhibition Center", "Jindal", "Manjunathnagar", "Nagasandra", "Dasarahalli", "Jalahalli", "Peenya Industry", "Peenya", "Yeswanthpur Industry", "Yeswanthpur", "Sandal Soap Factory", "Mahalaxmi", "Rajajinagar", "Kuvempu Road", "Srirampura", "Sampige Road", "Kempegowda Interchange", "Chikpet", "K R Market", "National College", "Lalbagh", "South End Circle", "Jayanagar", "R V Road Interchange", "Banashankari", "J P Nagar", "Puttenahalli", "Anjanapura Cross Road", "Krishna Leela Park", "Vajrahalli", "Thaighattapura", "Anjanapura/NICE Junction", "Kengeri", "R V College of Engineering", "Bangalore University Cross", "Rajarajeshwari Nagar", "Nayandahalli", "Mysore Road", "Deepanjali Nagar", "Attiguppe", "Vijayanagar", "Hosahalli", "Magadi Road", "City Railway Station", "Sir M Vishweshwariah", "Vidhana Soudha", "Cubbon Park", "M G Road Interchange", "Trinity", "Halasuru", "Indiranagar", "S V Road", "Baiyyappanahalli", "Jyotipura", "K R Puram", "Mahadevpura", "Garudacharpalya", "Doddanekkundi Induatrial State", "Vishweshwariah Industrial State", "Kundanahalli", "Vydhehi Hospital", "Satya Sai Medical Institute", "ITPB", "Kadugodi Industrial Area", "Ujjwal Vidhyalaya", "Whitefield", "Nagawara", "Arabic College", "Venkateshpura", "Tannery Town", "Pottery Town", "Cantonment Railway Station", "Shivajinagar", "Vellara Junction", "Langford Town", "Mico Bosch", "Dairy Circle", "Swagath Road Cross", "Jayadeva Hospital Interchange", "J P Nagar 4th Phase", "IIMB", "Hulimavu", "Gottigere", "Ragigudda Temple", "BTM Layout", "Silk Board", "HSR Layout", "Oxford College", "Muneshwara Nagar", "Chikkabegur", "Basapura Road", "Hosa Road", "Electronics City 1", "Electronics City 2", "Huskur Road", "Hebbagodi", "Bommasandra"
};
String[] operationalstops = {"M G Road Interchange","Trinity", "Halasuru", "Indiranagar", "S V Road", "Baiyyappanahalli"};
String[] greenline = {"Bangalore International Exhibition Center", "Jindal", "Manjunathnagar", "Nagasandra", "Dasarahalli", "Jalahalli", "Peenya Industry", "Peenya", "Yeswanthpur Industry", "Yeswanthpur", "Sandal Soap Factory", "Mahalaxmi", "Rajajinagar", "Kuvempu Road", "Srirampura", "Sampige Road", "Kempegowda Interchange", "Chikpet", "K R Market", "National College", "Lalbagh", "South End Circle", "Jayanagar", "R V Road Interchange", "Banashankari", "J P Nagar", "Puttenahalli", "Anjanapura Cross Road", "Krishna Leela Park", "Vajrahalli", "Thaighattapura", "Anjanapura/NICE Junction"};
String[] blueline = {"Kengeri", "R V College of Engineering", "Bangalore University Cross", "Rajarajeshwari Nagar", "Nayandahalli", "Mysore Road", "Deepanjali Nagar", "Attiguppe", "Vijayanagar", "Hosahall1i", "Magadi Road", "City Railway Station", "Kempegowda Interchange", "Sir M Vishweshwariah", "Vidhana Soudha", "Cubbon Park", "M G Road Interchange", "Trinity", "Halasuru", "Indiranagar", "S V Road", "Baiyyappanahalli", "Jyotipura", "K R Puram", "Mahadevpura", "Garudacharpalya", "Doddanekkundi Induatrial State", "Vishweshwariah Industrial State", "Kundanahalli", "Vydhehi Hospital", "Satya Sai Medical Institute", "ITPB", "Kadugodi Industrial Area", "Ujjwal Vidhyalaya", "Whitefield"};
String[] redline = {"Nagawara", "Arabic College", "Venkateshpura", "Tannery Town", "Pottery Town", "Cantonment Railway Station", "Shivajinagar", "M G Road Interchange", "Vellara Junction", "Langford Town", "Mico Bosch", "Dairy Circle", "Swagath Road Cross", "Jayadeva Hospital Interchange", "J P Nagar 4th Phase", "IIMB", "Hulimavu", "Gottigere"};
String[] yellowline = {"R V Road Interchange", "Ragigudda Temple", "Jayadeva Hospital Interchange", "BTM Layout", "Silk Board", "HSR Layout", "Oxford College", "Muneshwara Nagar", "Chikkabegur", "Basapura Road", "Hosa Road", "Electronics City 1", "Electronics City 2", "Huskur Road", "Hebbagodi", "Bommasandra"};
greenl=Arrays.asList(greenline);
bluel=Arrays.asList(blueline);
redl=Arrays.asList(redline);
yellowl=Arrays.asList(yellowline);
adapter=new Myadapter();
}
**************************The function causing crash******************************
public void distanceBetweenStations() {
for(int i=0;i<tolist.size();i++)
{
Cursor c1=mdb.getStops(tolist.get(i));
while(c1.moveToNext())
{
if(b)
{
Double lati=c1.getDouble(2);
Double longi=c1.getDouble(3);
mySourceLocation.setLatitude(lati);
mySourceLocation.setLongitude(longi);
disbetween[i]=0;
distancelist.add(disbetween[i].toString());
dis[i]=0;
b=false;
}
else
{
Double lati=c1.getDouble(2);
Double longi=c1.getDouble(3);
myTargetLocation.setLatitude(lati);
myTargetLocation.setLongitude(longi);
dis[i]=(int) mySourceLocation.distanceTo(myTargetLocation);
disbetween[i]=dis[i]-dis[i-1];
distancelist.add(disbetween[i].toString());
Toast.makeText(getApplicationContext(),longi+" "+lati+" "+disbetween[i], 1).show();
}
}
}
adapter.notifyDataSetChanged();
}
*************************The function causing crash*******************************
class Myadapter extends BaseAdapter
{
@Override
public int getCount() {
// TODO Auto-generated method stub
return tolist.size();
}
@Override
public Object getItem(int pos) {
// TODO Auto-generated method stub
return tolist.get(pos);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
RouteList.xml
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginTop="22dp"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/textView4"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_toLeftOf="@+id/textView3"
android:text="Large Text"
android:gravity="center"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
Routemap.xml
<LinearLayout 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"
android:background="@drawable/backfront"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="7dp"
android:layout_marginLeft="7dp"
android:layout_marginRight="7dp"
android:layout_marginTop="7dp"
android:background="@drawable/back"
android:orientation="horizontal" >
<TextView
android:id="@+id/RouteText"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:textColor="#FFFFFF" />
</LinearLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="7dp"
android:layout_marginLeft="7dp"
android:layout_marginRight="7dp"
android:layout_marginTop="7dp" >
<ImageView
android:id="@+id/exit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_marginBottom="10dp"
android:layout_marginTop="10dp"
android:layout_marginRight="20dp"
android:src="@drawable/exitapp" />
<ImageView
android:id="@+id/mapview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="@id/exit"
android:layout_alignParentBottom="true"
android:layout_marginBottom="10dp"
android:layout_marginTop="10dp"
android:layout_marginRight="20dp"
android:src="@drawable/pinmap" />
<ImageView
android:id="@+id/showlive"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="@id/mapview"
android:layout_alignParentBottom="true"
android:layout_marginBottom="10dp"
android:layout_marginTop="10dp"
android:layout_marginRight="20dp"
android:src="@drawable/pinmap" />
<ImageView
android:id="@+id/home"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="@id/showlive"
android:layout_alignParentBottom="true"
android:layout_marginBottom="10dp"
android:layout_marginTop="10dp"
android:layout_marginRight="20dp"
android:src="@drawable/home" />
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="@+id/exit"
android:paddingBottom="30dp" >
</ListView>
</RelativeLayout>
</LinearLayout>
LogCat 输出
12-10 12:49:31.577: E/AndroidRuntime(20793): FATAL EXCEPTION: main
12-10 12:49:31.577: E/AndroidRuntime(20793): java.lang.RuntimeException: Unable to start activity ComponentInfo{veniteck.solutions.mapmymetro/veniteck.solutions.mapmymetro.Route}: java.lang.ArrayIndexOutOfBoundsException: length=97; index=-1
12-10 12:49:31.577: E/AndroidRuntime(20793): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2077)
12-10 12:49:31.577: E/AndroidRuntime(20793): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2104)
12-10 12:49:31.577: E/AndroidRuntime(20793): at android.app.ActivityThread.access$600(ActivityThread.java:134)
12-10 12:49:31.577: E/AndroidRuntime(20793): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1247)
12-10 12:49:31.577: E/AndroidRuntime(20793): at android.os.Handler.dispatchMessage(Handler.java:99)
12-10 12:49:31.577: E/AndroidRuntime(20793): at android.os.Looper.loop(Looper.java:154)
12-10 12:49:31.577: E/AndroidRuntime(20793): at android.app.ActivityThread.main(ActivityThread.java:4624)
12-10 12:49:31.577: E/AndroidRuntime(20793): at java.lang.reflect.Method.invokeNative(Native Method)
12-10 12:49:31.577: E/AndroidRuntime(20793): at java.lang.reflect.Method.invoke(Method.java:511)
12-10 12:49:31.577: E/AndroidRuntime(20793): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:809)
12-10 12:49:31.577: E/AndroidRuntime(20793): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:576)
12-10 12:49:31.577: E/AndroidRuntime(20793): at dalvik.system.NativeStart.main(Native Method)
12-10 12:49:31.577: E/AndroidRuntime(20793): Caused by: java.lang.ArrayIndexOutOfBoundsException: length=97; index=-1
12-10 12:49:31.577: E/AndroidRuntime(20793): at veniteck.solutions.mapmymetro.Route.distanceBetweenStations(Route.java:161)
12-10 12:49:31.577: E/AndroidRuntime(20793): at veniteck.solutions.mapmymetro.Route.sameline(Route.java:359)
12-10 12:49:31.577: E/AndroidRuntime(20793): at veniteck.solutions.mapmymetro.Route.onCreate(Route.java:90)
12-10 12:49:31.577: E/AndroidRuntime(20793): at android.app.Activity.performCreate(Activity.java:4479)
12-10 12:49:31.577: E/AndroidRuntime(20793): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1050)
12-10 12:49:31.577: E/AndroidRuntime(20793): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2041)
1 2-10 12:49:31.577: E/AndroidRuntime(20793): ... 11 more
12-10 12:49:33.191: D/dalvikvm(20793): threadid=11: interp stack at 0x4d442000
最佳答案
变量 i 从 0 开始，并使用以下行:
disbetween[i]=dis[i]-dis[i-1];
所以你用 -1 索引 dis 数组
关于java - Android ListView 数组索引越界异常，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20488903/