我有两项活动LoginActivity和MyMapActivity。问题是，当我第二次尝试打开MyMapActivity（Login-＆gt; MyMapActivity（第一次活动有效） - ＆gt; Logout - ＆gt; Login）时，我收到以下错误：
08-10 06:55:27.663: E/AndroidRuntime(3630): FATAL EXCEPTION: main
08-10 06:55:27.663: E/AndroidRuntime(3630): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.pac/com.example.pac.MyMapActivity}: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
08-10 06:55:27.663: E/AndroidRuntime(3630): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2247)
08-10 06:55:27.663: E/AndroidRuntime(3630): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2297)
08-10 06:55:27.663: E/AndroidRuntime(3630): at android.app.ActivityThread.access$700(ActivityThread.java:152)
08-10 06:55:27.663: E/AndroidRuntime(3630): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1282)
08-10 06:55:27.663: E/AndroidRuntime(3630): at android.os.Handler.dispatchMessage(Handler.java:99)
08-10 06:55:27.663: E/AndroidRuntime(3630): at android.os.Looper.loop(Looper.java:137)
08-10 06:55:27.663: E/AndroidRuntime(3630): at android.app.ActivityThread.main(ActivityThread.java:5328)
08-10 06:55:27.663: E/AndroidRuntime(3630): at java.lang.reflect.Method.invokeNative(Native Method)
08-10 06:55:27.663: E/AndroidRuntime(3630): at java.lang.reflect.Method.invoke(Method.java:511)
08-10 06:55:27.663: E/AndroidRuntime(3630): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
08-10 06:55:27.663: E/AndroidRuntime(3630): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
08-10 06:55:27.663: E/AndroidRuntime(3630): at dalvik.system.NativeStart.main(Native Method)
08-10 06:55:27.663: E/AndroidRuntime(3630): Caused by: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
08-10 06:55:27.663: E/AndroidRuntime(3630): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
08-10 06:55:27.663: E/AndroidRuntime(3630): at java.util.ArrayList.get(ArrayList.java:304)
08-10 06:55:27.663: E/AndroidRuntime(3630): at com.example.pac.MyMapActivity.onCreate(MyMapActivity.java:232)
08-10 06:55:27.663: E/AndroidRuntime(3630): at android.app.Activity.performCreate(Activity.java:5250)
08-10 06:55:27.663: E/AndroidRuntime(3630): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1097)
08-10 06:55:27.663: E/AndroidRuntime(3630): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
08-10 06:55:27.663: E/AndroidRuntime(3630): ... 11 more
MyMapActivity中的第232行：
fantasma1 = myMap.addMarker(newMarkerOptions().position(rlevel.get(v)).icon(BitmapDescriptorFactory.fromResource(R.drawable .marker_white)));
MyMapActivity类：
public class MyMapActivity extends Activity implements AnimationLayout.Listener {
public final static String TAG = "Demo";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
userFunctions = new UserFunctions();
setContentView(R.layout.game_screen);
deigma = (TextView)findViewById(R.id.textView1);
mLayout = (AnimationLayout) findViewById(R.id.animation_layout);
mLayout.setListener(this);
/*permissions gia parse twn sintetagmenwn*/
//telos permission
if(userFunctions.isUserLoggedIn(getApplicationContext())){
//logout
btnLogout = (Button) findViewById(R.id.logout);
btnLogout.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
// TODO Auto-generated method stub
userFunctions.logoutUser(getApplicationContext());
Intent login = new Intent(getApplicationContext(), LoginActivity.class);
login.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(login);
// Closing dashboard screen
finish();
}
});
//telos logout
/*menu
*/
//telos
/* user location settings */
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Location location = null;
// locationManager.getlastfix().reset();
if(locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)||locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)){
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(true);
criteria.setSpeedRequired(true);
criteria.setCostAllowed(true);
criteria.setBearingRequired(true);
//API level 9 and up
criteria.setHorizontalAccuracy(Criteria.ACCURACY_HIGH);
criteria.setVerticalAccuracy(Criteria.ACCURACY_HIGH);
criteria.setBearingAccuracy(Criteria.ACCURACY_LOW);
criteria.setSpeedAccuracy(Criteria.ACCURACY_HIGH);
provider = locationManager.getBestProvider(criteria, true);
deigma.setText(String.valueOf(locationManager));
location = locationManager.getLastKnownLocation(provider);
locationManager.requestLocationUpdates(provider, 0, 0, locationListener);
/*if (location != null) {
Log.e("PROVIDER SCELTO", provider);
onLocationChanged(location);
Log.e("LATITUDE", String.valueOf("da"));
Log.e("LONGITUDE", String.valueOf("no"));
}*/
}
//telos rithmisewn
/* Helper function. put it in the same page, or in a library */
protected static String downloadFile(String url) {
// to fill-in url content
StringBuilder builder = new StringBuilder();
// local objects declarations
HttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
try {
HttpResponse response = client.execute(httpGet);
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
if (statusCode == 200) {
HttpEntity entity = response.getEntity();
InputStream content = entity.getContent();
BufferedReader reader = new BufferedReader(
new InputStreamReader(content));
String line;
while ((line = reader.readLine()) != null) {
builder.append(line);
}
} else {
// Failed to download file
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return builder.toString();
}
/*telos*/
private final LocationListener locationListener = new LocationListener()
{
@Override
public void onLocationChanged(Location location) {
locationManager.removeUpdates(this);
float accuracy = (float) location.getAccuracy();
//deigma.setText(Float.toString(accuracy));
//updateWithNewLocation(location);
myLocationMarker.remove();
lat = location.getLatitude();
lng = location.getLongitude();
thesi_xristi=new LatLng(lat,lng);
myLocationMarker = myMap.addMarker(new MarkerOptions()
.position(thesi_xristi)
.icon(BitmapDescriptorFactory.fromResource(R.drawable.k)));
for(int vb23=0;vb23<markers_balls.size();vb23++){
double rla = rballs.get(vb23).latitude;
double rlo = rballs.get(vb23).longitude;
if(calculateDistance(lat, lng, rla, rlo,"M")<0.00080){
markers_balls.get(vb23).remove();
markers_balls.remove(vb23);
score=score+10;
}
}
deigma.setText(score +" ac: "+accuracy);
}
@Override
public void onProviderDisabled(String provider) {
//updateWithNewLocation(null);
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
};
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.my_map, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_legalnotices:
String LicenseInfo = GooglePlayServicesUtil.getOpenSourceSoftwareLicenseInfo(
getApplicationContext());
AlertDialog.Builder LicenseDialog = new AlertDialog.Builder(MyMapActivity.this);
LicenseDialog.setTitle("Legal Notices");
LicenseDialog.setMessage(LicenseInfo);
LicenseDialog.show();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext());
if (resultCode == ConnectionResult.SUCCESS){
//Toast.makeText(getApplicationContext(),
// "isGooglePlayServicesAvailable SUCCESS",
//Toast.LENGTH_LONG).show();
}else{
GooglePlayServicesUtil.getErrorDialog(resultCode, this, RQS_GooglePlayServices);
}
}
private double calculateDistance(double lat1, double lon1, double lat2, double lon2, String unit)
{
double theta = lon1 - lon2;
double dist = Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2)) + Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * Math.cos(deg2rad(theta));
dist = Math.acos(dist);
dist = rad2deg(dist);
dist = dist * 60 * 1.1515;
if (unit == "K") {
dist = dist * 1.609344;
} else if (unit == "M") {
dist = dist * 0.8684;
}
return (dist);
}
/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
/*:: This function converts decimal degrees to radians :*/
/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
private double deg2rad(double deg)
{
return (deg * Math.PI / 180.0);
}
/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
/*:: This function converts radians to decimal degrees :*/
/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
private double rad2deg(double rad)
{
return (rad * 180.0 / Math.PI);
}
public void onClickContentButton(View v) {
mLayout.toggleSidebar();
}
@Override
public void onBackPressed() {
if (mLayout.isOpening()) {
mLayout.closeSidebar();
} else {
finish();
}
}
/* Callback of AnimationLayout.Listener to monitor status of Sidebar */
@Override
public void onSidebarOpened() {
Log.d(TAG, "opened");
}
/* Callback of AnimationLayout.Listener to monitor status of Sidebar */
@Override
public void onSidebarClosed() {
Log.d(TAG, "opened");
}
/* Callback of AnimationLayout.Listener to monitor status of Sidebar */
@Override
public boolean onContentTouchedWhenOpening() {
// the content area is touched when sidebar opening, close sidebar
Log.d(TAG, "going to close sidebar");
mLayout.closeSidebar();
return true;
}
@Override
public void onDestroy() {
super.onPause();
rlevel.clear();
rlevel2.clear();
rlevel3.clear();
rballs.clear();
markers_balls.clear();
go.cancel();
}
}
我正在尝试重新初始化arraylists onDestroy，但是，我遇到了同样的问题。
答案 0 :(得分：0)
发生错误引起：java.lang.IndexOutOfBoundsException：索引0无效，大小为0
arraylist重新初始化但没有在arraylist上添加任何值。所以arraylist大小为零。
您获取索引为0的值。
因此它会抛出indeoutofboundsexception。
请在获取值之前检查arraylist大小。