Question

我试图通过输入字符串并将其发送到谷歌地理编码并使用JSON将其恢复来获取经度和纬度。但每当我运行此代码时，我都会得到一个NetworkOnMainThreadException。这是为什么？我该如何解决这个问题？

public class SearchAddressActivity extends Activity{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.search_on_address);

        getLocationInfo("New Cross rd SE146AS London");
    }


    public JSONObject getLocationInfo(String address) {

        address = address.replaceAll(" ", "%20");
        Double lon = new Double(0);
        Double lat = new Double(0);
        HttpGet httpGet = new HttpGet("http://maps.google.com/maps/api/geocode/json?address="+ address + "&sensor=false");
        HttpClient client = new DefaultHttpClient();
        HttpResponse response;
        StringBuilder stringBuilder = new StringBuilder();

        try {
            response = client.execute(httpGet);
            HttpEntity entity = response.getEntity();
            InputStream stream = entity.getContent();
            int b;
            while ((b = stream.read()) != -1) {
                stringBuilder.append((char) b);
            }
        } catch (ClientProtocolException e) {
        } catch (IOException e) {
        }

        JSONObject jsonObject = new JSONObject();
        try {
            jsonObject = new JSONObject(stringBuilder.toString());
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        try {
            lon = ((JSONArray) jsonObject.get("results")).getJSONObject(0)
                    .getJSONObject("geometry").getJSONObject("location")
                    .getDouble("lng");

            lat = ((JSONArray) jsonObject.get("results")).getJSONObject(0)
                    .getJSONObject("geometry").getJSONObject("location")
                    .getDouble("lat");

        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        Log.e("LON", String.valueOf(lon));
        Log.e("LAT", String.valueOf(lat));
        return jsonObject;
    }   
}

logcat的

06-14 00:38:21.675: E/AndroidRuntime(18999): FATAL EXCEPTION: main
06-14 00:38:21.675: E/AndroidRuntime(18999): java.lang.RuntimeException: Unable to start activity ComponentInfo{eu.mysite.www/eu.mysite.www.SearchAddressActivity}: android.os.NetworkOnMainThreadException
06-14 00:38:21.675: E/AndroidRuntime(18999):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2100)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at android.app.ActivityThread.access$600(ActivityThread.java:140)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at android.os.Looper.loop(Looper.java:137)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at android.app.ActivityThread.main(ActivityThread.java:4898)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at java.lang.reflect.Method.invokeNative(Native Method)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at java.lang.reflect.Method.invoke(Method.java:511)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at dalvik.system.NativeStart.main(Native Method)
06-14 00:38:21.675: E/AndroidRuntime(18999): Caused by: android.os.NetworkOnMainThreadException
06-14 00:38:21.675: E/AndroidRuntime(18999):    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1118)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at java.net.InetAddress.getAllByName(InetAddress.java:214)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:670)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:509)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at eu.mysite.www.SearchAddressActivity.getLocationInfo(SearchAddressActivity.java:47)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at eu.mysite.www.SearchAddressActivity.onCreate(SearchAddressActivity.java:32)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at android.app.Activity.performCreate(Activity.java:5206)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1083)
06-14 00:38:21.675: E/AndroidRuntime(18999):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064)
06-14 00:38:21.675: E/AndroidRuntime(18999):    ... 11 more

Answer 1

错误说明了一切，你不应该在主线程上执行网络操作阅读有关进程和线程以及如何使用它们的this页面
和this页面有关如何在不同的线程上正确使用网络

示例：（来自Android Developers）

 // Uses AsyncTask to create a task away from the main UI thread. This task takes a 
 // URL string and uses it to create an HttpUrlConnection. Once the connection
 // has been established, the AsyncTask downloads the contents of the webpage as
 // an InputStream. Finally, the InputStream is converted into a string, which is
 // displayed in the UI by the AsyncTask's onPostExecute method.
 private class DownloadWebpageTask extends AsyncTask<String, Void, String> {
    @Override
    protected String doInBackground(String... urls) {

        // params comes from the execute() call: params[0] is the url.
        try {
            return downloadUrl(urls[0]);
        } catch (IOException e) {
            return "Unable to retrieve web page. URL may be invalid.";
        }
    }
    // onPostExecute displays the results of the AsyncTask.
    @Override
    protected void onPostExecute(String result) {
        textView.setText(result);
   }
}

Answer 2

错误日志中的重要一行是：

android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1118)

它说“某事”阻止了这个请求 - 特别是操作系统（感谢Brian Roach明确表示）。您必须将网络请求明确地放在与UI线程不同的线程中 - 否则您的UI将挂起，直到网络响应。

请参阅Victor Lap的答案，了解如何正确提出请求。

我还强烈建议您对查询进行正确的URL编码 - “空格”不是唯一可能导致问题的字符......

获取纬度和经度会给我NetworkOnMainThreadException

2 个答案: