java - Android 上的 Google Places API : No route to host

Question

我在我的应用程序中使用 google places api 来显示附近的食物位置。

我正在使用以下代码:

public class Background extends AsyncTask<String, Integer, String> {

    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);
    }

    @Override
    protected String doInBackground(String... params) {
        pfr = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
        lctn = "location=" + latitude + "," + longitude;
        key = "&key=my key";
        type = "&types=" + pfr.getString("type", "food");
        radius = "&radius=" + pfr.getString("radius", "500");
        sensor = "&sensor=false";
        StringBuilder requesturl = new StringBuilder(googlegives);
        requesturl.append(lctn);
        requesturl.append(radius);
        requesturl.append(type);
        requesturl.append(key);
        requesturl.append(sensor);
        DefaultHttpClient client = new DefaultHttpClient();
        HttpGet req = new HttpGet(requesturl.toString());
        Log.d("create", "0");
        try {
            HttpResponse res = client.execute(req);
            HttpEntity jsonentity = res.getEntity();
            String data = EntityUtils.toString(jsonentity);
            JSONObject jsonobj = new JSONObject(data);
            JSONArray resarray = jsonobj.getJSONArray("results");
            if (resarray.length() == 0) {
                Toast.makeText(getApplicationContext(), "nothing found",
                    Toast.LENGTH_LONG).show();
            } else {
                int len = resarray.length();
                for (int j = 0; j < len; j++) {
                    lon = resarray.getJSONObject(j).getJSONObject("geometry")
                            .getJSONObject("location").getDouble("lng");
                    lat = resarray.getJSONObject(j).getJSONObject("geometry")
                            .getJSONObject("location").getDouble("lat");
                    LatLng latLng = new LatLng(lat, lon);
                    googleMap.addMarker(new MarkerOptions()
                            .position(latLng)
                            .title(
                                resarray.getJSONObject(j).getJSONObject("name")
                                        .toString())
                            .snippet(
                                resarray.getJSONObject(j)
                                        .getJSONObject("formatted_address")
                                        .toString()));
                }
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return null;
    }
}

获取纬度和经度作为获取用户当前位置的全局变量，在我的手机上运行此应用程序后出现在 log cat 中

03-03 16:52:37.859: W/System.err(4780): java.net.SocketException: No route to host
03-03 16:52:37.906: W/System.err(4780):     at org.apache.harmony.luni.platform.OSNetworkSystem.connect(Native Method)
03-03 16:52:37.906: W/System.err(4780):     at dalvik.system.BlockGuard$WrappedNetworkSystem.connect(BlockGuard.java:357)
03-03 16:52:37.906: W/System.err(4780):     at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:204)
03-03 16:52:37.914: W/System.err(4780):     at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:437)
03-03 16:52:37.914: W/System.err(4780):     at java.net.Socket.connect(Socket.java:1002)
03-03 16:52:37.914: W/System.err(4780):     at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
03-03 16:52:37.914: W/System.err(4780):     at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:143)
03-03 16:52:37.914: W/System.err(4780):     at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
03-03 16:52:37.914: W/System.err(4780):     at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
03-03 16:52:37.914: W/System.err(4780):     at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:359)
03-03 16:52:37.914: W/System.err(4780):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
03-03 16:52:37.914: W/System.err(4780):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
03-03 16:52:37.921: W/System.err(4780):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
03-03 16:52:37.921: W/System.err(4780):     at com.abhishekbietcs.locomap.Mapme$Background.doInBackground(Mapme.java:258)
03-03 16:52:37.921: W/System.err(4780):     at com.abhishekbietcs.locomap.Mapme$Background.doInBackground(Mapme.java:1)
03-03 16:52:37.921: W/System.err(4780):     at android.os.AsyncTask$2.call(AsyncTask.java:185)
03-03 16:52:37.921: W/System.err(4780):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
03-03 16:52:37.921: W/System.err(4780):     at java.util.concurrent.FutureTask.run(FutureTask.java:138)
03-03 16:52:37.921: W/System.err(4780):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
03-03 16:52:37.921: W/System.err(4780):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
03-03 16:52:37.921: W/System.err(4780):     at java.lang.Thread.run(Thread.java:1019)

为什么抛出这个异常？我怎样才能摆脱它？

Answer 1

java.net.SocketException: No route to host.

当没有路由连接到主机时会发生此异常。

我在这里发现了你的问题。

key = "&key=我的 key ";

替换为

String APIKEY="AIzaSyDcLMS0IKQL3N76rO-aD2thfO46r96OCQI";
key = "&key=" + APIKEY;

而且你链接错了。

您的链接:

https://maps.googleapis.com/maps/api/place/nearbysearch/output?jsonlocation=25.4509294,78.630043&radius=15000&types=food&key=key&sensor=false

链接必须是这样的:

String url = https://maps.googleapis.com/maps/api/place/search/json?location=25.4509294,78.630043&radius=15000&types=food&key=AIzaSyDcLMS0IKQL3N76rO-aD2thfO46r96OCQI&sensor=false

要获取 JSON，您可以使用我的代码。

String data = getUrlContents(url); //Calling method

方法的定义。

private String getUrlContents(String Url) 
{
    StringBuilder content = new StringBuilder();
    try {
        URL url = new URL(Url);
        URLConnection urlConnection = url.openConnection();
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()), 8);
        String line;
        while ((line = bufferedReader.readLine()) != null) 
        {
            content.append(line + "\n");
        }
        bufferedReader.close();
    }
    catch (Exception e) {
        e.printStackTrace();
    }
    return content.toString();
}