Google Maps android IndexOutOfBoundsException [英] Google Maps android IndexOutOfBoundsException
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问题描述
我试图让标记放置在地图上并飞往目的地。在forloop中，我有一个if语句，我希望它能这样做：
for（i loop）{
if（array（i）== null {spawn plane code}
else {move plane code}
这里是代码：
package com.fly.plane;
import java。 sql.Time;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List; $ b $ import java.util.Timer;
import java.util.TimerTask;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.fly.plane.R;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.MapView;
import com.google.android.gms.maps.Projection;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatL NG;
导入com.google.android.gms.maps.model.Marker;
导入com.google.android.gms.maps.model.MarkerOptions;
导入android.R.array;
导入android.app.ListActivity;
导入android.app.ProgressDialog;
导入android.graphics.Point;
导入android.os.AsyncTask;
导入android.os.Bundle;
导入android.os.Handler;
导入android.os.Looper;
导入android.os.SystemClock;
导入android.support.v4.app.FragmentActivity;
导入android.text.format.DateFormat;
导入android.util.Log;
导入android.view.View;
导入android.view.animation.Interpolator;
导入android.view.animation.LinearInterpolator;
导入android.widget.TextView;
public class MyMapActivity extends ListActivity {
private ProgressDialog pDialog;
//获取数据的URL JSON
private static String url =http://edmundgentle.com/snippets/flights/api.php;
// JSON节点速度
private static final String TAG_data =data;
private static final String TAG_BEARING =bearing;
private static final String TAG_SPEED =speed;
private static final String TAG_ARR =arr;
private static final String TAG_ARR_TIME =time;
private static final String TAG_ARR_LAT =lat;
private static final String TAG_ARR_LON =lon;
private static final String TAG_DEP =dep;
private static final String TAG_DEP_TIME =time;
private static final String TAG_DEP_LAT =lat;
private static final String TAG_DEP_LON =lon;
//数据JSONArray
JSONArray data = null;
//用于ListView的Hashmap
ArrayList< HashMap< String，Double>>联系人列表;
// ListView的Hashmap
ArrayList< Double> CT;
列表<标记> markers = new ArrayList< Marker>（）;
//最终处理程序处理程序;
私有GoogleMap mMap;
public static final LatLng dest（Double alt，Double aln，int i）{
// double double latitude = Double.parseDouble（alt）;
// final double longitude = Double.parseDouble（aln）;
返回新的LatLng（alt，aln）;
}
public double latt = -15.48169437461;
public double lng = -15.48169437461;
public ArrayList< Integer> DLAT;
public String [] markerList;
public String dlat;
public String dlon;
public String alat;
public String alon;
private int count;
public boolean wait = true;
//私人按钮startB;
公共TextView文本;
定时器计时;
double time = 600;
double timm = 1;
long timer = 18000000;
long newTime;
TextView电视，测试;
线程t;
@Override
protected void onCreate（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）;
setContentView（R.layout.activity_my_map）;
contactList = new ArrayList< HashMap< String，Double>>（）;
ct = new ArrayList< Double>（）;
// ListView lv = getListView（）;
//创建标记
new Getdata（）。execute（）;
//计时器在快速时间显示时间
t = new Thread（）{
@Override
public void run（）{
try {
while（！isInterrupted（））{
Thread.sleep（600）;
runOnUiThread（new Runnable（）{
@Override
public void run（）{
timer = timer +60000;
if（timer> = 64000000）timer = 18000000;
newTime = timer;
//在此处更新TextView！
// String time =HH：mm：ss;
//tv.setText(DateFormat。格式（time，timer））;
tv.setText（Double.toString（time））;
test.setText（Double.toString（timm））;
//tv.setText（ （）;
// Timer（）;
}
}）;
}
} catch（InterruptedException e）{
}
}
};
tv = new TextView（this）;
test = new TextView（this）;
tv =（TextView）findViewById（R.id.timer）;
test =（TextView）findViewById（R.id.test）;
//从现在开始，在10秒内运行mUpdateUITimerTask的run（）方法
}
//赋予每个飞机动画
public void animateMarker（final Marker marker，final LatLng toPosition，
final boolean hideMarker，final double spd）{
float speed =（float）spd; // Float.parseFloat（spd）;
final Handler handler = new Handler（）;
final long start = SystemClock.uptimeMillis（）;
Projection proj = mMap.getProjection（）;
Point startPoint = proj.toScreenLocation（marker.getPosition（））;
final LatLng startLatLng = proj.fromScreenLocation（startPoint）;
最终浮动时间= 10 *速度;
final Interpolator interpolator = new LinearInterpolator（）;
handler.post（new Runnable（）{
@Override
public void run（）{
long elapsed = SystemClock.uptimeMillis（） - start;
float t = interpolator.getInterpolation（（float）（（float）elapsed
/ duration））;
double lng = t * toPosition.longitude +（1 - t）
* startLatLng.longitude;
double lat = t * toPosition.latitude +（1 - t）
* startLatLng.latitude;
marker.setPosition（new LatLng（lat，lng））;
if（t < 1.0）{
// 16ms后再次发布
handler.postDelayed（this，16）;
} else {
handler.postDelayed（this，16）;
if（hideMarker）{
marker.setVisible（false）;
} else {
marker.setVisible（真）;
}
}
}
}）;
public void Timer（）{
// TimerTask tasknew = new TimerTask（）;
timing = new Timer（）;
timing.schedule（new CreateMarker（），1000，1000）;
$ b public String calcCurPos（double curlat，double curlon，double deslat，double deslon，double avgSpd，double bearing）{
double distance = avgSpd * 0.0167;
//检查度数或弧度
// deslat = distance * Math.cosh（bearing）;
// double retLat = curlat + deslat;
// double dPhi = Math.log（Math.tan（retLat / 2 + Math.PI / 4）/Math.tan（curlat / 2 + Math.PI / 4））;
// double q = deslat / dPhi deslat / dPhi：Math.cos（curlat）;
轴承=轴承* Math.PI / 180;
int radius = 6371;
double nextLat = Math.asin（Math.sin（curlat）* Math.cos（距离/半径）
+ Math.cos（curlat）* Math.sin（距离/半径） * Math.cos（轴承））;
double nextLon = curlon + Math.atan2（Math.sin（bearing）* Math.sin（distance / radius）
* Math.cos（curlat），Math.cos（distance /半径）-Math.sin（curlat）* Math.sin（nextLat））;
nextLat =（nextLat * 180）/ Math.PI;
nextLon =（nextLon * 180）/ Math.PI;
/ **
*警告可能希望在返回之前将它们转换为字符串。
* /
return nextLat +; + nextLon;
}
public class CreateMarker extends TimerTask {
@Override
public void run（）{
// TODO自动生成的方法存根
//打印测试
//tv.setText(Double.toString（time））;
//tv.setText(Double.toString（time））;
if（time> = 2400）{
time = 0;
}
时间+ = 1;
// mMap =（（MapFragment）getFragmentManager（）。findFragmentById（R.id.map））。getMap（）;
for（int i = 0; i <100; i ++）{
//从数组列表中获取数据
final double depLat = contactList.get（i）.get （ DLAT）;
final double depLon = contactList.get（i）.get（dlon）;
final double arLat = contactList.get（i）.get（alat）;
final double arLon = contactList.get（i）.get（alon）;
final double spd = contactList.get（i）.get（speed）;
final double dTime = contactList.get（i）.get（time）;
double curLat = contactList.get（i）.get（clat）;
double curLon = contactList.get（i）.get（clon）;
final double bearing = contactList.get（i）.get（bearing）;
final int j = i;
// int dTime = Integer.parseInt（dtime）;
double oldLat = curLat;
$ b $ if（time> = dTime）
{
if（curLat< arLat || curLat> 0）{
字符串latlng = calcCurPos（curLat，curLon，arLat，arLon，spd，方向）;
String [] values = latlng.split（;）;
curLat = Double.parseDouble（values [0]）;
curLon = Double.parseDouble（values [1]）;
final double crLat = curLat;
final double crLon = curLon;
final LatLng position = new LatLng（crLat，crLon）;
$ b $ * Marker mo = mMap.addMarker（new MarkerOptions（）
.position（new LatLng（depLat，depLon））
.icon（BitmapDescriptorFactory.fromResource （R.drawable.planemarker）））; * /
// DrawMarker（）;
//animateMarker (markers.get（i），position，true，spd）;
try {
if（markers.get（i）== null）{
// timm + = 1;
timm + = 1;
runOnUiThread（new Runnable（）{
@Override
public void run（）{
final Marker marker = mMap.addMarker（new MarkerOptions（）
.position（new LatLng（depLat，depLon））
.title（Hello world）
.icon（BitmapDescriptorFactory.fromResource（R.drawable.planemarker）））;
标记。 add（marker）;
//marker.setVisible(false）;
//animateMarker(markers.get(j），new LatLng（arLat，arLon），true，spd）;
// Marker marker = markers.get（i）;
//marker.setPosition(position）;
}
}）;
}
else // (markers.get（i）！= null）{
{
Marker marker = markers.get（i）;
marker.setPosition（position）;
marker.setVisible（false）;
//animateMarker (markers.get（i），position，true，spd）;
catch（NullPointerException npe）
{
//做别的事
}
}
}
}
//返回null;
$ **
*通过进行HTTP调用获取json的异步任务类
* * /
private class Getdata extends AsyncTask< Void，Void，Void> {
@Override
保护无效onPreExecute（）{
super.onPreExecute（）;
//显示进度对话框
pDialog = new ProgressDialog（MyMapActivity.this）;
pDialog.setMessage（Please wait ...）;
pDialog.setCancelable（false）;
pDialog.show（）;
$ b $覆盖
保护无效doInBackground（Void ... arg0）{
//创建服务处理器类实例
HTTPHandler sh = new HTTPHandler（）;
//向url发出请求并获取响应
String jsonStr = sh.makeServiceCall（url，HTTPHandler.GET）;
Log.d（Response：，>+ jsonStr）;
布尔值limit = false;
if（jsonStr！= null || limit == false）{
try {
JSONObject jsonObj = new JSONObject（jsonStr）;
//获取JSON数组节点
data = jsonObj.getJSONArray（TAG_data）;
//遍历所有数据
for（int i = 0; i< data.length（）; i ++）{
JSONObject c = data.getJSONObject（i） ;
字符串轴承= c.getString（TAG_BEARING）;
String spd = c.getString（TAG_SPEED）;
//出发节点是JSON对象
JSONObject dep = c.getJSONObject（TAG_DEP）;
String dtime = dep.getString（TAG_DEP_TIME）;
// String dlat = dep.getString（TAG_DEP_LAT）;
// String dlon = dep.getString（TAG_DEP_LON）;
dlat = dep.getString（TAG_DEP_LAT）;
dlon = dep.getString（TAG_DEP_LON）;
//替换：从出发时间起最后2个0
dtime = dtime.replaceAll（：，）;
//dtime.replaceAll（;，）;
dtime = dtime.substring（0，dtime.length（） - 2）;
//到达节点是JSON对象
JSONObject arr = c.getJSONObject（TAG_ARR）;
String alt = arr.getString（TAG_ARR_LAT）;
String aln = arr.getString（TAG_ARR_LON）;
//将数据位置转换为Google地图+双倍数据
double brng = Double.parseDouble（bearing）;
brng = brng * Math.PI / 180;
double speed = Double.parseDouble（spd）;
// double brng = Double.parseDouble（bearing）;
double dLatitude = Double.parseDouble（dlat）;
double dLongitude = Double.parseDouble（dlon）;
double aLatitude = Double.parseDouble（alt）;
double aLongitude = Double.parseDouble（aln）;
double cLatitude = Double.parseDouble（dlat）;
double cLongitude = Double.parseDouble（dlon）;
double dtme = Double.parseDouble（dtime）;
//单个联系人的tmp hashmap
HashMap< String，Double> contact = new HashMap< String，Double>（）;
contact.put（bearing，brng）;
contact.put（速度，速度）;
contact.put（time，dtme）;
contact.put（alat，aLatitude）;
contact.put（alon，aLongitude）;
contact.put（dlat，dLatitude）;
contact.put（dlon，dLongitude）;
contact.put（clat，cLatitude）;
contact.put（clon，cLongitude）;
//将联系人添加到联系人列表
contactList.add（contact）;
if（i == data.length（））{
wait = false;
$ b $ catch（JSONException e）{
e.printStackTrace（）;
} else {
Log.e（ServiceHandler，无法从网址获取任何数据）;
}
返回null;
}
//在json加载时产生飞机
@Override
protected void onPostExecute（void result）{
Timer（）;
t.start（）;
super.onPostExecute（result）;
//关闭进度对话框
if（pDialog.isShowing（））
pDialog.dismiss（）;
//使用plane api作为latlon
mMap =（（MapFragment）getFragmentManager（）。findFragmentById（R.id.map））。getMap（）;
// for（int i = 0; i< contactList.size（）; i ++）
}}
}
这里是错误信息：
02-26 21：53：42.031：E / AndroidRuntime（14970）：致命例外：Timer-0
02-26 21：53：42.031：E / AndroidRuntime（14970）：java .lang.IndexOutOfBoundsException：无效索引0，大小为0
02-26 21：53：42.031：E / AndroidRuntime（14970）：在java.util.ArrayList.throwIndexOutOfBoundsException（ArrayList.java:255）
02-26 21：53：42.031：E / AndroidRuntime（14970）：在java.util.ArrayList.get（ArrayList.java:308）
02-26 21：53：42.031：E / AndroidRuntime（14970） ）：at com.fly.plane.MyMapActivity $ CreateMarker.run（MyMapActivity.java:395）
02-26 21：53：42.031：E / AndroidRuntime（14970）：位于java.util.Timer $ TimerImpl。运行（Timer.java:284）
据我了解，markers.get（i）问题，但我不知道如何检查标记数组是否为空它抛出这个错误。
任何帮助将不胜感激。
解决方案
您可以使用 Map< Integer ，Marker> （ Integer 是键， Marker 是值）。然后，您可以利用 Map.get（），如果键为整数而不是 null （你的代码中你的 i 不会是 null ）。 / p>
将标记声明为Map：
Map< Integer，Marker> markers = new HashMap< Integer，Marker>（）;
里面 CreateMarker.run（） code> final LatLng position = new LatLng（crLat，crLon）; 更改如下：
//隐式装箱在Map $ b中使用int整数ii = Integer.valueOf（i）;
//尝试通过map中的索引获得标记（索引是关键字）
Marker markerByIndex = markers.get（ii）;
//如果指定键的对象不在映射中，则返回null
if（markerByIndex == null）{
//标记不存在 - 创建它，添加到谷歌地图和按键
timm + = 1;
runOnUiThread（new Runnable（）{
@Override
public void run（）{
final Marker marker = mMap.addMarker（new MarkerOptions（）
.position（ new LatLng（depLat，depLon））
.title（Hello world）
.icon（BitmapDescriptorFactory.fromResource（R.drawable.planemarker）））;
//使用i作为键
markers.put（ii，marker）;
}
}）;
} else {
// marker存在，改变它
markerByIndex.setPosition（position）;
markerByIndex.setVisible（false）;
//...将地图中的标记替换
markers.put（ii，markerByIndex）;
//赋予标记
的动画效果animateMarker（markerByIndex，position，true，spd）;
}
I am trying to get markers placed on the map and fly to their destination. within a forloop i have an if statement, i wish it to do this:
for(i loop){
If (array(i) == null{ spawn plane code}
else {move plane code}
here is the code:
package com.fly.plane;
import java.sql.Time;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.fly.plane.R;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.MapView;
import com.google.android.gms.maps.Projection;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import android.R.array;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.graphics.Point;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.SystemClock;
import android.support.v4.app.FragmentActivity;
import android.text.format.DateFormat;
import android.util.Log;
import android.view.View;
import android.view.animation.Interpolator;
import android.view.animation.LinearInterpolator;
import android.widget.TextView;
public class MyMapActivity extends ListActivity {
private ProgressDialog pDialog;
// URL to get data JSON
private static String url = "http://edmundgentle.com/snippets/flights/api.php";
// JSON Node speeds
private static final String TAG_data = "data";
private static final String TAG_BEARING = "bearing";
private static final String TAG_SPEED = "speed";
private static final String TAG_ARR = "arr";
private static final String TAG_ARR_TIME = "time";
private static final String TAG_ARR_LAT = "lat";
private static final String TAG_ARR_LON = "lon";
private static final String TAG_DEP = "dep";
private static final String TAG_DEP_TIME = "time";
private static final String TAG_DEP_LAT = "lat";
private static final String TAG_DEP_LON = "lon";
// data JSONArray
JSONArray data = null;
// Hashmap for ListView
ArrayList<HashMap<String, Double>> contactList;
// Hashmap for ListView
ArrayList<Double> ct;
List<Marker> markers = new ArrayList<Marker>();
//final Handler handler;
private GoogleMap mMap;
public static final LatLng dest(Double alt,Double aln, int i){
//final double latitude = Double.parseDouble(alt);
//final double longitude = Double.parseDouble(aln);
return new LatLng(alt, aln);
}
public double latt = -15.48169437461;
public double lng = -15.48169437461;
public ArrayList<Integer> dLat;
public String[] markerList;
public String dlat;
public String dlon;
public String alat;
public String alon;
private int count;
public boolean wait = true;
//private Button startB;
public TextView text;
Timer timing;
double time = 600;
double timm = 1;
long timer = 18000000;
long newTime;
TextView tv, test;
Thread t;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_map);
contactList = new ArrayList<HashMap<String, Double>>();
ct = new ArrayList<Double>();
//ListView lv = getListView();
//create markers
new Getdata().execute();
// timer showing time of day in fast time
t = new Thread() {
@Override
public void run() {
try {
while (!isInterrupted()) {
Thread.sleep(600);
runOnUiThread(new Runnable() {
@Override
public void run() {
timer = timer +60000;
if (timer >= 64000000) timer = 18000000;
newTime = timer;
// update TextView here!
//String time = "HH:mm:ss";
//tv.setText(DateFormat.format(time , timer));
tv.setText(Double.toString(time));
test.setText(Double.toString(timm));
//tv.setText(Double.toString(contactList.get(20).get("time")));
//Timer();
}
});
}
} catch (InterruptedException e) {
}
}
};
tv = new TextView(this);
test = new TextView(this);
tv=(TextView)findViewById(R.id.timer);
test=(TextView)findViewById(R.id.test);
// run the mUpdateUITimerTask's run() method in 10 seconds from now
}
// animate each plane
public void animateMarker(final Marker marker , final LatLng toPosition,
final boolean hideMarker, final double spd) {
float speed = (float) spd;// Float.parseFloat(spd);
final Handler handler = new Handler();
final long start = SystemClock.uptimeMillis();
Projection proj = mMap.getProjection();
Point startPoint = proj.toScreenLocation(marker.getPosition());
final LatLng startLatLng = proj.fromScreenLocation(startPoint);
final float duration = 10 * speed;
final Interpolator interpolator = new LinearInterpolator();
handler.post(new Runnable() {
@Override
public void run() {
long elapsed = SystemClock.uptimeMillis() - start;
float t = interpolator.getInterpolation((float) ((float) elapsed
/ duration));
double lng = t * toPosition.longitude + (1 - t)
* startLatLng.longitude;
double lat = t * toPosition.latitude + (1 - t)
* startLatLng.latitude;
marker.setPosition(new LatLng(lat, lng));
if (t < 1.0) {
// Post again 16ms later.
handler.postDelayed(this, 16);
} else {
handler.postDelayed(this, 16);
if (hideMarker) {
marker.setVisible(false);
} else {
marker.setVisible(true);
}
}
}
});
}
public void Timer(){
//TimerTask tasknew = new TimerTask();
timing = new Timer();
timing.schedule(new CreateMarker(), 1000, 1000);
}
public String calcCurPos(double curlat, double curlon, double deslat, double deslon, double avgSpd, double bearing){
double distance = avgSpd * 0.0167;
// check if degrees or radians
//deslat = distance * Math.cosh(bearing);
//double retLat = curlat + deslat;
//double dPhi = Math.log(Math.tan(retLat/2+Math.PI/4)/Math.tan(curlat/2+Math.PI/4));
//double q = deslat/dPhi deslat/dPhi : Math.cos(curlat);
bearing = bearing * Math.PI / 180;
int radius = 6371;
double nextLat = Math.asin(Math.sin(curlat)* Math.cos(distance/radius)
+ Math.cos(curlat)*Math.sin(distance/radius)*Math.cos(bearing));
double nextLon = curlon + Math.atan2(Math.sin(bearing)* Math.sin(distance/ radius)
* Math.cos(curlat), Math.cos(distance/radius)-Math.sin(curlat) * Math.sin(nextLat));
nextLat = (nextLat * 180) / Math.PI;
nextLon = (nextLon * 180) / Math.PI;
/**
* Warning might want to convert them to string prior to return.
*/
return nextLat + ";" + nextLon;
}
public class CreateMarker extends TimerTask{
@Override
public void run() {
// TODO Auto-generated method stub
// print test
//tv.setText(Double.toString(time));
//tv.setText(Double.toString(time));
if (time >= 2400){
time=0;
}
time += 1;
//mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
for (int i =0; i < 100;i++){
// get data from array list
final double depLat = contactList.get(i).get("dlat");
final double depLon = contactList.get(i).get("dlon");
final double arLat = contactList.get(i).get("alat");
final double arLon = contactList.get(i).get("alon");
final double spd = contactList.get(i).get("speed");
final double dTime = contactList.get(i).get("time");
double curLat = contactList.get(i).get("clat");
double curLon = contactList.get(i).get("clon");
final double bearing = contactList.get(i).get("bearing");
final int j = i;
//int dTime = Integer.parseInt(dtime);
double oldLat = curLat;
if (time >= dTime)
{
if (curLat < arLat || curLat > 0){
String latlng = calcCurPos(curLat, curLon, arLat, arLon ,spd, bearing );
String[] values = latlng.split(";");
curLat = Double.parseDouble(values[0]);
curLon = Double.parseDouble(values[1]);
final double crLat = curLat;
final double crLon = curLon;
final LatLng position = new LatLng(crLat,crLon);
/*Marker mo = mMap.addMarker(new MarkerOptions()
.position(new LatLng(depLat, depLon))
.icon(BitmapDescriptorFactory.fromResource(R.drawable.planemarker)));*/
//DrawMarker();
//animateMarker(markers.get(i), position , true, spd);
try{
if (markers.get(i) == null){
//timm += 1;
timm += 1;
runOnUiThread(new Runnable() {
@Override
public void run() {
final Marker marker = mMap.addMarker(new MarkerOptions()
.position(new LatLng(depLat, depLon))
.title("Hello world")
.icon(BitmapDescriptorFactory.fromResource(R.drawable.planemarker)));
markers.add(marker);
//marker.setVisible(false);
//animateMarker(markers.get(j), new LatLng(arLat,arLon) , true, spd);
//Marker marker = markers.get(i);
//marker.setPosition(position);
}
});
}
else //(markers.get(i) != null){
{
Marker marker = markers.get(i);
marker.setPosition(position);
marker.setVisible(false);
//animateMarker(markers.get(i), position , true, spd);
}
}
catch(NullPointerException npe)
{
//do something else
}
}
}
}
//return null;
}
}
/**
* Async task class to get json by making HTTP call
* */
private class Getdata extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(MyMapActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
// Creating service handler class instance
HTTPHandler sh = new HTTPHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url, HTTPHandler.GET);
Log.d("Response: ", "> " + jsonStr);
boolean limit = false;
if (jsonStr != null || limit == false) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
data = jsonObj.getJSONArray(TAG_data);
// looping through All data
for (int i = 0; i < data.length(); i++) {
JSONObject c = data.getJSONObject(i);
String bearing = c.getString(TAG_BEARING);
String spd = c.getString(TAG_SPEED);
// departure node is JSON Object
JSONObject dep = c.getJSONObject(TAG_DEP);
String dtime = dep.getString(TAG_DEP_TIME);
//String dlat = dep.getString(TAG_DEP_LAT);
//String dlon = dep.getString(TAG_DEP_LON);
dlat = dep.getString(TAG_DEP_LAT);
dlon = dep.getString(TAG_DEP_LON);
// replace : and last 2 0's from departure time
dtime = dtime.replaceAll(":","");
//dtime.replaceAll(";","");
dtime = dtime.substring(0,dtime.length()-2);
// arrival node is JSON Object
JSONObject arr = c.getJSONObject(TAG_ARR);
String alt = arr.getString(TAG_ARR_LAT);
String aln = arr.getString(TAG_ARR_LON);
// convert data positions to doubles for Google Maps + stuff
double brng = Double.parseDouble(bearing);
brng = brng * Math.PI / 180;
double speed = Double.parseDouble(spd);
//double brng = Double.parseDouble(bearing);
double dLatitude = Double.parseDouble(dlat);
double dLongitude = Double.parseDouble(dlon);
double aLatitude = Double.parseDouble(alt);
double aLongitude = Double.parseDouble(aln);
double cLatitude = Double.parseDouble(dlat);
double cLongitude = Double.parseDouble(dlon);
double dtme = Double.parseDouble(dtime);
// tmp hashmap for single contact
HashMap<String, Double> contact = new HashMap<String, Double>();
contact.put("bearing", brng);
contact.put("speed", speed);
contact.put("time", dtme);
contact.put("alat", aLatitude);
contact.put("alon", aLongitude);
contact.put("dlat", dLatitude);
contact.put("dlon", dLongitude);
contact.put("clat", cLatitude);
contact.put("clon", cLongitude);
// adding contact to contact list
contactList.add(contact);
if (i== data.length()){
wait = false;
}
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
// spawns planes when json loaded
@Override
protected void onPostExecute(Void result) {
Timer();
t.start();
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
// use plane api for latlon
mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
//for (int i = 0; i < contactList.size() ; i++)
}}
}
and here is the error message:
02-26 21:53:42.031: E/AndroidRuntime(14970): FATAL EXCEPTION: Timer-0
02-26 21:53:42.031: E/AndroidRuntime(14970): java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
02-26 21:53:42.031: E/AndroidRuntime(14970): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
02-26 21:53:42.031: E/AndroidRuntime(14970): at java.util.ArrayList.get(ArrayList.java:308)
02-26 21:53:42.031: E/AndroidRuntime(14970): at com.fly.plane.MyMapActivity$CreateMarker.run(MyMapActivity.java:395)
02-26 21:53:42.031: E/AndroidRuntime(14970): at java.util.Timer$TimerImpl.run(Timer.java:284)
i understand that the markers.get(i) is causing the problem, but i dont know how to check if the markers array is null without it throwing this error.
Any help would be appreciated.
解决方案
You can use Map<Integer, Marker> (Integer are keys and Marker are values). Then you can leverage Map.get() which don't throws Exception if key is Integer and not null (your i will not be null in your code).
Declare markers as Map:
Map<Integer, Marker> markers = new HashMap<Integer, Marker>();
Inside CreateMarker.run() after final LatLng position = new LatLng(crLat,crLon); change as follows:
//implicit boxing to use int in Map
Integer ii = Integer.valueOf(i);
//try to get marker by index from map (index is the key)
Marker markerByIndex = markers.get(ii);
//Map.get() returns null if object by specified key is not in map
if (markerByIndex == null){
//marker doesn't exists - create it, add to Google Map and to Map by key
timm += 1;
runOnUiThread(new Runnable() {
@Override
public void run() {
final Marker marker = mMap.addMarker(new MarkerOptions()
.position(new LatLng(depLat, depLon))
.title("Hello world")
.icon(BitmapDescriptorFactory.fromResource(R.drawable.planemarker)));
//put marker to map using i as a key
markers.put(ii, marker);
}
});
} else {
//marker exists, mutate it
markerByIndex.setPosition(position);
markerByIndex.setVisible(false);
//...replace the marker in map
markers.put(ii, markerByIndex);
//animate the marker
animateMarker(markerByIndex, position , true, spd);
}
这篇关于Google Maps android IndexOutOfBoundsException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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