我想将我的坐标标记为谷歌地图，但是当我尝试从json url显示坐标时我有一些错误，如果我在字符串变量中使用json，它的工作原理，但是如果我使用json输出的url我得到了一些错误，这是我的错误通知：
06-11 17:09:03.350 8874-8874/? I/art: Late-enabling -Xcheck:jni
06-11 17:09:03.496 8874-8884/com.spp.udi.udi I/art: Background sticky concurrent mark sweep GC freed 3264(175KB) AllocSpace objects, 0(0B) LOS objects, 67% free, 412KB/1286KB, paused 6.981ms total 57.503ms
06-11 17:09:03.535 8874-8874/com.spp.udi.udi W/System: ClassLoader referenced unknown path: /data/app/com.spp.udi.udi-1/lib/arm64
06-11 17:09:03.542 8874-8874/com.spp.udi.udi I/InstantRun: Instant Run Runtime started. Android package is com.spp.udi.udi, real application class is null.
06-11 17:09:05.153 8874-8874/com.spp.udi.udi W/System: ClassLoader referenced unknown path: /data/app/com.spp.udi.udi-1/lib/arm64
06-11 17:09:05.233 8874-8874/com.spp.udi.udi I/GMPM: App measurement is starting up, version: 8487
06-11 17:09:05.233 8874-8874/com.spp.udi.udi I/GMPM: To enable debug logging run: adb shell setprop log.tag.GMPM VERBOSE
06-11 17:09:05.382 8874-8874/com.spp.udi.udi V/Monotype: SetAppTypeFace- try to flip, app = com.spp.udi.udi
06-11 17:09:05.390 8874-8874/com.spp.udi.udi V/Monotype: Typeface getFontPathFlipFont - systemFont = /data/data/flipfont/app_fonts/Felbridge#Felbridge
06-11 17:09:05.418 8874-8874/com.spp.udi.udi V/Monotype: SetAppTypeFace- try to flip, app = com.spp.udi.udi
06-11 17:09:05.418 8874-8874/com.spp.udi.udi V/Monotype: Typeface getFontPathFlipFont - systemFont = /data/data/flipfont/app_fonts/Felbridge#Felbridge
06-11 17:09:05.648 8874-8874/com.spp.udi.udi V/Monotype: SetAppTypeFace- try to flip, app = com.spp.udi.udi
06-11 17:09:05.648 8874-8874/com.spp.udi.udi V/Monotype: Typeface getFontPathFlipFont - systemFont = /data/data/flipfont/app_fonts/Felbridge#Felbridge
06-11 17:09:05.832 8874-8874/com.spp.udi.udi I/zzad: Making Creator dynamically
06-11 17:09:05.974 8874-8884/com.spp.udi.udi I/art: Background partial concurrent mark sweep GC freed 401(23KB) AllocSpace objects, 5(84KB) LOS objects, 39% free, 3MB/5MB, paused 7.671ms total 33.791ms
06-11 17:09:06.151 8874-8874/com.spp.udi.udi I/Google Maps Android API: Google Play services client version: 8487000
06-11 17:09:06.168 8874-8874/com.spp.udi.udi I/Google Maps Android API: Google Play services package version: 11055446
06-11 17:09:06.635 8874-8969/com.spp.udi.udi W/agl: copyMemory is missing from platform - proto runtime falling back to safer methods.
06-11 17:09:06.653 8874-8950/com.spp.udi.udi I/DpmTcmClient: RegisterTcmMonitor from: com.android.okhttp.TcmIdleTimerMonitor
06-11 17:09:06.953 8874-8987/com.spp.udi.udi D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
06-11 17:09:07.242 8874-8874/com.spp.udi.udi I/DpmTcmClient: RegisterTcmMonitor from: org.apache.http.impl.conn.TcmIdleTimerMonitor
06-11 17:09:07.248 8874-8874/com.spp.udi.udi W/System: ClassLoader referenced unknown path: /system/framework/com.qualcomm.qti.GBAHttpAuthentication.jar
06-11 17:09:07.257 8874-8874/com.spp.udi.udi D/AndroidRuntime: Shutting down VM
06-11 17:09:07.259 8874-8874/com.spp.udi.udi E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.spp.udi.udi, PID: 8874
android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1273)
at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:110)
at libcore.io.IoBridge.connectErrno(IoBridge.java:137)
at libcore.io.IoBridge.connect(IoBridge.java:122)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:452)
at java.net.Socket.connect(Socket.java:884)
at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:124)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:149)
at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:169)
at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:124)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:370)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:560)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:492)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:470)
at com.spp.udi.udi.JSONParser.AmbilJson(JSONParser.java:100)
at com.spp.udi.udi.MainActivity.fetchDataFromJSON(MainActivity.java:49)
at com.spp.udi.udi.MainActivity.onMapReady(MainActivity.java:43)
at com.google.android.gms.maps.SupportMapFragment$zza$1.zza(Unknown Source)
at com.google.android.gms.maps.internal.zzo$zza.onTransact(Unknown Source)
at android.os.Binder.transact(Binder.java:387)
at com.google.android.gms.maps.internal.aq.a(:com.google.android.gms.DynamiteModulesB:5)
at com.google.maps.api.android.lib6.impl.bb.run(:com.google.android.gms.DynamiteModulesB:5)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5451)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
06-11 17:09:08.915 8874-8985/com.spp.udi.udi W/DynamiteModule: Local module descriptor class for com.google.android.gms.googlecertificates not found.
06-11 17:09:08.923 8874-8985/com.spp.udi.udi W/DynamiteModule: Failed to load module via V2: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.dynamite.DynamiteModule$DynamiteLoaderClassLoader" on path: DexPathList[[zip file "/data/app/com.spp.udi.udi-1/base.apk"],nativeLibraryDirectories=[/data/app/com.spp.udi.udi-1/lib/arm64, /vendor/lib64, /system/lib64]]
06-11 17:09:08.927 8874-8985/com.spp.udi.udi I/DynamiteModule: Considering local module com.google.android.gms.googlecertificates:0 and remote module com.google.android.gms.googlecertificates:3
06-11 17:09:08.928 8874-8985/com.spp.udi.udi I/DynamiteModule: Selected remote version of com.google.android.gms.googlecertificates, version >= 3
06-11 17:09:08.960 8874-8985/com.spp.udi.udi W/System: ClassLoader referenced unknown path: /data/data/com.google.android.gms/app_chimera/m/00000004/n/arm64-v8a
这是我的主要活动：
package com.spp.udi.udi;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.widget.Toast;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
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.MarkerOptions;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class MainActivity extends FragmentActivity implements OnMapReadyCallback {
Context mContext;
private GoogleMap mMap;
JSONParser jParser = new JSONParser();
String link_url = "http://10.0.0.2/project/s9/udi/android/peta.php";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
LatLng sydney = new LatLng(-34, 151);
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
// Fetch data
fetchDataFromJSON();
}
private void fetchDataFromJSON()
{
// JSON response
JSONObject json = jParser.AmbilJson(link_url);
try
{
JSONArray jsonArray = json.getJSONArray("info");
// Clear old markers
mMap.clear();
// Looping through all info and show on map
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
String name = jsonObject.getString("nama");
String description = jsonObject.getString("deskripsi");
String latitude = jsonObject.getString("lat");
String longitude = jsonObject.getString("lng");
// Add marker
addMarkerToMap(latitude, longitude, name, description);
}
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(mContext, "Error: " + e.getMessage(), Toast.LENGTH_LONG).show();
}
}
public void addMarkerToMap(String latitude, String longitude, String title, String description)
{
double lat = Double.parseDouble(latitude);
double lng = Double.parseDouble(longitude);
// create marker
MarkerOptions marker = new MarkerOptions().position(new LatLng(lat, lng))
.title(title)
.snippet(description);
// Marker icon
marker.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
// Add marker to map
mMap.addMarker(marker);
}
}
答案 0 :(得分：0)
您正在主线程中执行网络任务，了解其获取的原因 强制关闭，作为android规则和规则，我们不能预先形成任何 任何Activity的主线程中的网络操作。所以你应该使用
AsyncTask用于在主线程中执行网络任务。如下：
private class NetWorkTask extends AsyncTask<String, Void, String>{
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected String doInBackground(String... params) {
return null;
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
}
}
详情请参阅以下链接
http://www.vogella.com/tutorials/AndroidBackgroundProcessing/article.html