Android java.lang.IllegalStateException，不在主线程上

时间：2014-11-05 09:32:08

标签： java android multithreading google-maps

我在Android中使用Google地图实施时出现问题。我想从互联网上获取一些数据（有些人说在地图的可见部分有单位）。当我想在onPostExecute中清除地图中的所有先前标记时，问题就开始了。这是代码：

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() {
        });


    }
}

正如您可能看到的，我已经尝试对问题map.clear（）“没有运行主线程”进行一些研究但没有成功，因为asynctask根本没有运行而我得到的只是只是这个非法的例子：不在主线上。

EDIT1：不，它甚至不能在简单的onpostexecute上工作，我仍然没有在主线程上找到东西

EDIT2：因为我完全忘记了堆栈跟踪，我意识到我在后台进程中有一个try catch块，抱歉，我在凌晨4点写了代码。所以堆栈跟踪是：

 11-05 10:48:56.504: W/System.err(5498): java.lang.IllegalStateException: Not on the main thread
 11-05 10:48:56.504: W/System.err(5498):    at com.google.j.a.cl.b(Unknown Source)
 11-05 10:48:56.504: W/System.err(5498):    at com.google.maps.api.android.lib6.c.br.b(Unknown Source)
 11-05 10:48:56.504: W/System.err(5498):    at com.google.maps.api.android.lib6.c.dw.a(Unknown Source)
 11-05 10:48:56.504: W/System.err(5498):    at com.google.android.gms.maps.internal.l.onTransact(SourceFile:51)
 11-05 10:48:56.505: W/System.err(5498):    at android.os.Binder.transact(Binder.java:380)
 11-05 10:48:56.505: W/System.err(5498):    at com.google.android.gms.maps.internal.IGoogleMapDelegate$a$a.getCameraPosition(Unknown Source)
 11-05 10:48:56.505: W/System.err(5498):    at com.google.android.gms.maps.GoogleMap.getCameraPosition(Unknown Source)
 11-05 10:48:56.505: W/System.err(5498):    at com.reddatura.freecharging_beta.MapView$GetNewPins.doInBackground(MapView.java:241)
 11-05 10:48:56.505: W/System.err(5498):    at com.reddatura.freecharging_beta.MapView$GetNewPins.doInBackground(MapView.java:1)
 11-05 10:48:56.505: W/System.err(5498):    at android.os.AsyncTask$2.call(AsyncTask.java:288)
 11-05 10:48:56.505: W/System.err(5498):    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
 11-05 10:48:56.505: W/System.err(5498):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
 11-05 10:48:56.505: W/System.err(5498):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
 11-05 10:48:56.505: W/System.err(5498):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
 11-05 10:48:56.505: W/System.err(5498):    at java.lang.Thread.run(Thread.java:818)

感谢彼得。所以这个问题似乎不像我最初想的那样在onPostExecute，但它是doinbackground，我想得到campos变量

EDIT3：正如Adogeon建议我把整个事情放在主循环中，但有一个例外，我知道，只是为了我为此使用asynctask ...但我很容易建议

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：没关系伙计们，我已经把它搞得很难看了，但是现在它看起来很有效......在asynctask执行之前移动了所有“基于地图的东西”，所以我在线程之间传递东西，是非常不安全的，但它确实有效，没有其他问题。愿上帝怜悯我的灵魂，因为我将承诺犯下罪恶...... 谢谢大家的帮助:)）

3 个答案:

答案 0 :(得分：1)

您应该在主线程上调用该操作。您不能操纵主线程以外的视图（例如，在doInBackground方法中）。 只需删除异步任务。

答案 1 :(得分：0)

我这样做了：

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。此外，我已将参数更改为GetNewPins的LatLng，因此现在所有Google地图相关内容都在主线程上。

答案 2 :(得分：0)

当他说＆＃34时，

Adogeon是正确的。你应该在主线程上调用该操作。您不能操纵除主线程以外的视图（例如在doInBackground方法中）＆＃34;。

Citrus，更具体地说，您的问题出在以下代码块中：

LatLng campos = map.getCameraPosition().target;
VisibleRegion vr = map.getProjection().getVisibleRegion();

当您致电 map.someFunction（）时。你不能在那里调用视图的方法。

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