Android java.lang.IllegalStateException,不在主线程上
我对谷歌地图在安卓系统中的实现有一个问题。我想从互联网上获取一些数据(比如地图可见部分的单位)。当我想在onPostExecute中清除映射中以前的所有标记时,问题就开始了。代码如下:Android java.lang.IllegalStateException,不在主线程上,java,android,multithreading,google-maps,Java,Android,Multithreading,Google Maps,我对谷歌地图在安卓系统中的实现有一个问题。我想从互联网上获取一些数据(比如地图可见部分的单位)。当我想在onPostExecute中清除映射中以前的所有标记时,问题就开始了。代码如下: private class GetNewPins extends AsyncTask<Void, String, Unit[]> { @Override protected Unit[] doInBackground(Void... f_url) { try
private class GetNewPins extends AsyncTask<Void, String, Unit[]>
{
@Override
protected Unit[] doInBackground(Void... f_url)
{
try
{
LatLng campos = map.getCameraPosition().target;
VisibleRegion vr = map.getProjection().getVisibleRegion();
double left = vr.latLngBounds.southwest.longitude;
double top = vr.latLngBounds.northeast.latitude;
double right = vr.latLngBounds.northeast.longitude;
double bottom = vr.latLngBounds.southwest.latitude;
Location middleLeftCornerLocation = new Location("right");
Location center = new Location("center");
middleLeftCornerLocation.setLatitude(right);
middleLeftCornerLocation.setLongitude(vr.latLngBounds
.getCenter().longitude);
center.setLatitude(vr.latLngBounds.getCenter().latitude);
center.setLongitude(vr.latLngBounds.getCenter().longitude);
float dis = center.distanceTo(middleLeftCornerLocation);
System.out.println("Gettin' data from " + campos.latitude + " "
+ campos.longitude + " " + dis);
Unit[] units = new FreechargingAPI().GetUnitsOnMap(
campos.latitude, campos.longitude, dis);
if (units != null)
{
return units;
}
} catch (Exception e)
{
System.out.println(e);
}
return null;
}
@Override
protected void onPostExecute(final Unit[] units)
{
if (units == null)
{
return;
}
MapView.this.runOnUiThread(new Runnable()
{
@Override
public void run()
{
map.clear();
for (Unit u : units)
{
// Creating an instance of MarkerOptions to set position
MarkerOptions markerOptions = new MarkerOptions();
// Setting position on the MarkerOptions
markerOptions.position(new LatLng(Double.parseDouble(u
.getUnitgpslatitude()), Double.parseDouble(u
.getUnitgpslongitude())));
// Adding marker on the GoogleMap
Marker marker = map.addMarker(markerOptions.title(
u.getUnitname()).snippet(
DistanceConverter.convert(u.getDistance())));
// Showing InfoWindow on the GoogleMap
marker.showInfoWindow();
}
}// public void run() {
});
}
}
谢谢彼得。因此,问题似乎不像我最初所想的那样出现在onPostExecute,而是doinbackground,我想在这里获取campos变量
EDIT3:正如Adogeon建议的那样,我已经把整个事情放在了主循环中,但是有一个例外,我知道,只是为了说明为什么我使用asynctask来完成这个任务……但是我倾向于其他建议
11-05 11:28:06.926: W/System.err(6417): android.os.NetworkOnMainThreadException
11-05 11:28:06.927: W/System.err(6417): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1147)
11-05 11:28:06.927: W/System.err(6417): at libcore.io.BlockGuardOs.recvfrom(BlockGuardOs.java:249)
11-05 11:28:06.927: W/System.err(6417): at libcore.io.IoBridge.recvfrom(IoBridge.java:553)
11-05 11:28:06.927: W/System.err(6417): at java.net.PlainSocketImpl.read(PlainSocketImpl.java:485)
11-05 11:28:06.927: W/System.err(6417): at java.net.PlainSocketImpl.access$000(PlainSocketImpl.java:37)
11-05 11:28:06.927: W/System.err(6417): at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:237)
11-05 11:28:06.927: W/System.err(6417): at com.android.okio.Okio$2.read(Okio.java:113)
11-05 11:28:06.927: W/System.err(6417): at com.android.okio.RealBufferedSource.indexOf(RealBufferedSource.java:147)
11-05 11:28:06.927: W/System.err(6417): at com.android.okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:94)
11-05 11:28:06.928: W/System.err(6417): at com.android.okhttp.internal.http.HttpConnection.readResponse(HttpConnection.java:175)
11-05 11:28:06.928: W/System.err(6417): at com.android.okhttp.internal.http.HttpTransport.readResponseHeaders(HttpTransport.java:101)
11-05 11:28:06.928: W/System.err(6417): at com.android.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:616)
11-05 11:28:06.928: W/System.err(6417): at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:379)
11-05 11:28:06.928: W/System.err(6417): at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:323)
11-05 11:28:06.928: W/System.err(6417): at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:190)
11-05 11:28:06.928: W/System.err(6417): at com.reddatura.serverside.FreechargingAPI.ExecuteGET(FreechargingAPI.java:42)
11-05 11:28:06.928: W/System.err(6417): at com.reddatura.serverside.FreechargingAPI.GetUnitsOnMap(FreechargingAPI.java:100)
11-05 11:28:06.928: W/System.err(6417): at com.reddatura.freecharging_beta.MapView$1.onMapSettled(MapView.java:101)
11-05 11:28:06.928: W/System.err(6417): at com.reddatura.listeners.MapStateListener.settleMap(MapStateListener.java:119)
11-05 11:28:06.928: W/System.err(6417): at com.reddatura.listeners.MapStateListener$4$1.run(MapStateListener.java:78)
11-05 11:28:06.928: W/System.err(6417): at android.os.Handler.handleCallback(Handler.java:739)
11-05 11:28:06.928: W/System.err(6417): at android.os.Handler.dispatchMessage(Handler.java:95)
11-05 11:28:06.928: W/System.err(6417): at android.os.Looper.loop(Looper.java:135)
11-05 11:28:06.928: W/System.err(6417): at android.app.ActivityThread.main(ActivityThread.java:5221)
11-05 11:28:06.928: W/System.err(6417): at java.lang.reflect.Method.invoke(Native Method)
11-05 11:28:06.929: W/System.err(6417): at java.lang.reflect.Method.invoke(Method.java:372)
11-05 11:28:06.929: W/System.err(6417): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
11-05 11:28:06.929: W/System.err(6417): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
编辑X:伙计们,没关系,我把它黑得很难看,但现在它似乎可以工作了……在异步任务执行之前移动了所有“基于映射的东西”,所以我在线程之间传递东西,这是非常不安全的,但它可以工作,其他什么都不重要。愿上帝怜悯我的灵魂,因为我将要犯下的罪。。。
谢谢大家的帮助:)您应该调用主线程上的操作。除主线程外,不能在其他线程上操作视图(例如,在doInBackground方法中)。 只需删除异步任务。我是这样做的:
vr = map.getProjection().getVisibleRegion();
LatLng curPos = map.getCameraPosition().target;
if (prevPos.latitude != curPos.latitude
|| prevPos.longitude != curPos.longitude)
{
new GetNewPins().execute(curPos);
}
vr
是VisibleRegion,它是类中的私有字段,将由GetNewPins使用。我还将参数改为GetNewPins的LatLng,因此现在所有与谷歌地图相关的内容都在主线程上。他说“你应该在主线程上调用操作。你不能在主线程以外的其他线程上操作视图(例如,在doInBackground方法中)”,这是正确的
,更具体地说,您的问题在下面的代码块中:
LatLng campos = map.getCameraPosition().target;
VisibleRegion vr = map.getProjection().getVisibleRegion();
调用map.someFunction()时。你不能在那里调用视图的方法。OnPostExecute已经在主线程中,你不需要
runOnUiThread
,只要把你的代码放在那里就行了。我也试过了,但这告诉我同样的道理当问关于异常的问题时,请始终包括完整的堆栈跟踪。你如何调用asynctask?但是单元[]单位=新的FreechargingAPI().GetUnitsOnMap(campos.latitude,campos.latitude,dis);是网络运营吗
LatLng campos = map.getCameraPosition().target;
VisibleRegion vr = map.getProjection().getVisibleRegion();