我是初学者在android中并试图让android地图旅行，但我的标记无法显示。因为我的logcat中有一些错误，并且通知：遗憾的是app已经停止工作了。你能帮助我吗？ （抱歉我的英语不好）
这是我的主要活动：
package id.meita.redproject;
import id.meita.redproject.entity.hotelpku;
import java.util.ArrayList;
import org.json.JSONObject;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.CameraUpdateFactory;
import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationManager;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.view.Menu;
import android.os.Bundle;
import android.app.ProgressDialog;
import android.os.AsyncTask;
public class MainActivity extends FragmentActivity
{
private GoogleMap map;
private JSONHelper json;
private ProgressDialog pDialog;
private ArrayList<hotelpku> listhotelpku;
private static String URL_API = "http://10.0.3.2/api/hotelpku.php";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
json = new JSONHelper();
new AsynTaskMain().execute();
setupMapIfNeeded();
}
/**
* initialize map
*/
private void setupMapIfNeeded() {
if (map == null) {
FragmentManager fragmentManager = getSupportFragmentManager();
SupportMapFragment supportMapFragment = (SupportMapFragment) fragmentManager
.findFragmentById(R.id.maps);
map = supportMapFragment.getMap();
if (map != null) {
setupMap();
}
}
}
/**
* Setup Map
*/
private void setupMap()
{
map.setMyLocationEnabled(true);
moveToMyLocation();
}
private void moveToMyLocation()
{
LocationManager locationManager = (LocationManager)
getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
Location location =
locationManager.getLastKnownLocation (locationManager.getBestProvider(criteria,false));
if (location !=null)
{
map.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(location.getLatitude(),
location.getLongitude()), 13));
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
protected void onResume()
{
// TODO Auto-generated method stub
super.onResume();
int resCode =
GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext());
if (resCode != ConnectionResult.SUCCESS)
{
GooglePlayServicesUtil.getErrorDialog(resCode, this, 1);
}
}
private class AsynTaskMain extends AsyncTask<Void,Void,Void>
{
protected void onPostExecute(Void result)
{
pDialog.dismiss();
runOnUiThread(new Runnable()
{
public void run()
{
for (int i = 0; i < listhotelpku.size(); i++)
{
map.addMarker(new MarkerOptions()
.position (new
LatLng(listhotelpku.get(i).getLat(),listhotelpku.get(i).getLng()))
.title(listhotelpku.get(i).getNama())
.snippet(listhotelpku.get(i).getAlamat()));
}
}
});
super.onPostExecute(result);
}
protected void onPreExecute()
{
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Loading....");
pDialog.setCancelable(true);
pDialog.show();
}
protected Void doInBackground(Void... params)
{
JSONObject jObject = json.getJSONFromURL(URL_API);
listhotelpku = json.gethotelpkuAll(jObject);
return null;
}
}
}
这是JSONHelper类：
package id.meita.redproject;
import id.meita.redproject.entity.hotelpku;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.google.android.gms.maps.model.LatLng;
import android.util.Log;
public class JSONHelper
{
private InputStream is = null;
private JSONObject jsonObject = null;
private String json = "";
private final String TAG_HOTELPKU = "hotelpku";
private final String TAG_ID = "id";
private final String TAG_NAMA = "nama";
private final String TAG_ALAMAT = "alamat";
private final String TAG_LAT = "lat";
private final String TAG_LNG = "lng";
private final String TAG_ROUTES = "routes";
private final String TAG_LEGS = "legs";
private final String TAG_STEPS = "steps";
private final String TAG_POLYLINE = "polyline";
private final String TAG_POINTS = "points";
private final String TAG_START = "start_location";
private final String TAG_END = "end_location";
public JSONObject getJSONFromURL(String url)
{
Log.d("TAG","URL Request ->" + url);
try
{
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e)
{
e.printStackTrace();
} catch (ClientProtocolException e)
{
e.printStackTrace();
} catch (IOException e)
{
e.printStackTrace();
}
try
{
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e)
{
// TODO: handle exception
}
try
{
jsonObject = new JSONObject(json);
} catch (JSONException e)
{
// TODO: handle exception
}
return jsonObject;
}
public ArrayList<hotelpku> gethotelpkuAll(JSONObject jobj)
{
ArrayList<hotelpku> listhotelpku = new ArrayList<hotelpku>();
try
{
JSONArray arrayhotelpku = jobj.getJSONArray(TAG_HOTELPKU);
for (int i = 0; i < arrayhotelpku.length(); i++)
{
JSONObject jobject = arrayhotelpku.getJSONObject(i);
Log.d("TAG", "lat : " + jobject.getDouble(TAG_LNG));
Log.d("log", "muter ke " + i);
listhotelpku.add(new hotelpku(jobject.getInt(TAG_ID), jobject.getString(TAG_NAMA), jobject
.getString(TAG_ALAMAT), jobject
.getDouble(TAG_LAT), jobject.getDouble(TAG_LNG)));
}
} catch (JSONException e)
{
e.printStackTrace();
}
return listhotelpku;
}
/*
* Untuk decode Polyline
*
* @params String
*
* @return List<LatLng>
*/
private List<LatLng> decodePoly(String encoded)
{
List<LatLng> poly = new ArrayList<LatLng>();
int index = 0, len = encoded.length();
int lat = 0, lng = 0;
while (index < len)
{
int b, shift = 0, result = 0;
do
{
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lat += dlat;
shift = 0;
result = 0;
do
{
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lng += dlng;
LatLng position = new LatLng(lat / 1E5, lng / 1E5);
poly.add(position);
}
return poly;
}
/*
* Untuk mendapatkan direction
*
* @params JSONObject
*
* @return List<LatLng>
*/
public List<LatLng> getDirection(JSONObject jObj)
{
List<LatLng> directions = new ArrayList<LatLng>();
try
{
JSONObject objRoute = jObj.getJSONArray(TAG_ROUTES).getJSONObject(0);
JSONObject objLegs = objRoute.getJSONArray(TAG_LEGS).getJSONObject(0);
JSONArray arraySteps = objLegs.getJSONArray(TAG_STEPS);
for (int wi2t = 0; wi2t < arraySteps.length(); wi2t++)
{
JSONObject step = arraySteps.getJSONObject(wi2t);
JSONObject objStart = step.getJSONObject(TAG_START);
JSONObject objEnd = step.getJSONObject(TAG_END);
double latStart = objStart.getDouble(TAG_LAT);
double lngStart = objStart.getDouble(TAG_LNG);
directions.add(new LatLng(latStart, lngStart));
JSONObject poly = step.getJSONObject(TAG_POLYLINE);
String encodedPoly = poly.getString(TAG_POINTS);
List<LatLng> decodedPoly = decodePoly(encodedPoly);
for (int eka = 0; eka < decodedPoly.size(); eka++)
{
directions.add(new LatLng(decodedPoly.get(eka).latitude, decodedPoly.get(eka).longitude));
}
double latEnd = objEnd.getDouble(TAG_LAT);
double lngEnd = objEnd.getDouble(TAG_LNG);
directions.add(new LatLng(latEnd, lngEnd));
}
} catch (JSONException e)
{
// TODO: handle exception
}
return directions;
}
}
是我的LOGCAT：
05-27 00:08:55.732: E/Trace(1998): error opening trace file: No such file or directory (2)
05-27 00:08:55.872: I/Google Maps Android API(1998): Google Play services client version: 4323000
05-27 00:08:55.884: I/Google Maps Android API(1998): Google Play services package version: 4452070
05-27 00:08:55.896: D/dalvikvm(1998): GC_CONCURRENT freed 171K, 10% free 2573K/2856K, paused 3ms+0ms, total 10ms
05-27 00:08:56.028: D/dalvikvm(1998): GC_CONCURRENT freed 245K, 12% free 2719K/3084K, paused 2ms+1ms, total 11ms
05-27 00:08:56.092: I/fpp(1998): Making Creator dynamically
05-27 00:08:56.092: I/Google Maps Android API(1998): Google Play services client version: 4452000
05-27 00:08:56.128: D/dalvikvm(1998): GC_CONCURRENT freed 246K, 12% free 2857K/3216K, paused 3ms+0ms, total 11ms
05-27 00:08:56.264: D/dalvikvm(1998): GC_CONCURRENT freed 143K, 8% free 3160K/3416K, paused 2ms+0ms, total 17ms
05-27 00:08:56.276: D/dalvikvm(1998): GC_FOR_ALLOC freed <1K, 8% free 3160K/3416K, paused 3ms, total 10ms
05-27 00:08:56.296: I/dalvikvm-heap(1998): Grow heap (frag case) to 4.266MB for 1127532-byte allocation
05-27 00:08:56.308: D/dalvikvm(1998): GC_FOR_ALLOC freed 0K, 6% free 4261K/4520K, paused 9ms, total 9ms
05-27 00:08:56.312: D/dalvikvm(1998): GC_CONCURRENT freed 0K, 6% free 4261K/4520K, paused 2ms+0ms, total 3ms
05-27 00:08:56.344: D/dalvikvm(1998): GC_CONCURRENT freed 66K, 4% free 4730K/4908K, paused 2ms+0ms, total 5ms
05-27 00:08:56.348: D/dalvikvm(1998): GC_FOR_ALLOC freed 6K, 4% free 4724K/4908K, paused 2ms, total 2ms
05-27 00:08:56.356: I/dalvikvm-heap(1998): Grow heap (frag case) to 5.793MB for 1127532-byte allocation
05-27 00:08:56.360: D/dalvikvm(1998): GC_FOR_ALLOC freed <1K, 4% free 5825K/6012K, paused 4ms, total 4ms
05-27 00:08:56.368: D/dalvikvm(1998): GC_CONCURRENT freed 0K, 4% free 5825K/6012K, paused 2ms+3ms, total 7ms
05-27 00:08:56.396: D/TAG(1998): URL Request ->http://10.0.3.2/api/hotelpku.php
05-27 00:08:56.464: D/libEGL(1998): loaded /system/lib/egl/libEGL_emulation.so
05-27 00:08:56.468: D/(1998): HostConnection::get() New Host Connection established 0xb8585340, tid 1998
05-27 00:08:56.480: D/libEGL(1998): loaded /system/lib/egl/libGLESv1_CM_emulation.so
05-27 00:08:56.480: D/libEGL(1998): loaded /system/lib/egl/libGLESv2_emulation.so
05-27 00:08:56.512: W/EGL_emulation(1998): eglSurfaceAttrib not implemented
05-27 00:08:56.524: D/OpenGLRenderer(1998): Enabling debug mode 0
05-27 00:08:56.616: W/EGL_emulation(1998): eglSurfaceAttrib not implemented
05-27 00:08:56.848: D/(1998): HostConnection::get() New Host Connection established 0xb85b9708, tid 2023
05-27 00:08:57.180: I/Choreographer(1998): Skipped 32 frames! The application may be doing too much work on its main thread.
05-27 00:08:57.808: D/dalvikvm(1998): GC_CONCURRENT freed 907K, 15% free 6076K/7092K, paused 5ms+2ms, total 56ms
05-27 00:08:57.808: D/dalvikvm(1998): WAIT_FOR_CONCURRENT_GC blocked 48ms
05-27 00:08:57.808: D/dalvikvm(1998): WAIT_FOR_CONCURRENT_GC blocked 46ms
05-27 00:08:57.812: W/dalvikvm(1998): threadid=21: thread exiting with uncaught exception (group=0xa6180908)
05-27 00:08:57.812: E/AndroidRuntime(1998): FATAL EXCEPTION: AsyncTask #1
05-27 00:08:57.812: E/AndroidRuntime(1998): java.lang.RuntimeException: An error occured while executing doInBackground()
05-27 00:08:57.812: E/AndroidRuntime(1998): at android.os.AsyncTask$3.done(AsyncTask.java:299)
05-27 00:08:57.812: E/AndroidRuntime(1998): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
05-27 00:08:57.812: E/AndroidRuntime(1998): at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
05-27 00:08:57.812: E/AndroidRuntime(1998): at java.util.concurrent.FutureTask.run(FutureTask.java:239)
05-27 00:08:57.812: E/AndroidRuntime(1998): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
05-27 00:08:57.812: E/AndroidRuntime(1998): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
05-27 00:08:57.812: E/AndroidRuntime(1998): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
05-27 00:08:57.812: E/AndroidRuntime(1998): at java.lang.Thread.run(Thread.java:856)
05-27 00:08:57.812: E/AndroidRuntime(1998): Caused by: java.lang.NullPointerException
05-27 00:08:57.812: E/AndroidRuntime(1998): at id.meita.redproject.JSONHelper.gethotelpkuAll(JSONHelper.java:106)
05-27 00:08:57.812: E/AndroidRuntime(1998): at id.meita.redproject.MainActivity$AsynTaskMain.doInBackground(MainActivity.java:143)
05-27 00:08:57.812: E/AndroidRuntime(1998): at id.meita.redproject.MainActivity$AsynTaskMain.doInBackground(MainActivity.java:1)
05-27 00:08:57.812: E/AndroidRuntime(1998): at android.os.AsyncTask$2.call(AsyncTask.java:287)
05-27 00:08:57.812: E/AndroidRuntime(1998): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
05-27 00:08:57.812: E/AndroidRuntime(1998): ... 4 more
05-27 00:08:58.052: I/Choreographer(1998): Skipped 51 frames! The application may be doing too much work on its main thread.
05-27 00:08:58.364: D/dalvikvm(1998): GC_FOR_ALLOC freed 957K, 15% free 6351K/7420K, paused 6ms, total 6ms
05-27 00:08:58.388: D/dalvikvm(1998): GC_CONCURRENT freed 68K, 14% free 6452K/7420K, paused 5ms+1ms, total 18ms
05-27 00:08:58.440: D/dalvikvm(1998): GC_CONCURRENT freed 710K, 11% free 6989K/7832K, paused 2ms+0ms, total 6ms
05-27 00:08:59.232: I/Choreographer(1998): Skipped 67 frames! The application may be doing too much work on its main thread.
05-27 00:09:00.316: E/WindowManager(1998): Activity id.meita.redproject.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{5330f044 V.E..... R......D 0,0-684,192} that was originally added here
05-27 00:09:00.316: E/WindowManager(1998): android.view.WindowLeaked: Activity id.meita.redproject.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{5330f044 V.E..... R......D 0,0-684,192} that was originally added here
05-27 00:09:00.316: E/WindowManager(1998): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354)
05-27 00:09:00.316: E/WindowManager(1998): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216)
05-27 00:09:00.316: E/WindowManager(1998): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
05-27 00:09:00.316: E/WindowManager(1998): at android.app.Dialog.show(Dialog.java:281)
05-27 00:09:00.316: E/WindowManager(1998): at id.meita.redproject.MainActivity$AsynTaskMain.onPreExecute(MainActivity.java:137)
05-27 00:09:00.316: E/WindowManager(1998): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
05-27 00:09:00.316: E/WindowManager(1998): at android.os.AsyncTask.execute(AsyncTask.java:534)
05-27 00:09:00.316: E/WindowManager(1998): at id.meita.redproject.MainActivity.onCreate(MainActivity.java:40)
05-27 00:09:00.316: E/WindowManager(1998): at android.app.Activity.performCreate(Activity.java:5104)
05-27 00:09:00.316: E/WindowManager(1998): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
05-27 00:09:00.316: E/WindowManager(1998): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
05-27 00:09:00.316: E/WindowManager(1998): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
05-27 00:09:00.316: E/WindowManager(1998): at android.app.ActivityThread.access$600(ActivityThread.java:141)
05-27 00:09:00.316: E/WindowManager(1998): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
05-27 00:09:00.316: E/WindowManager(1998): at android.os.Handler.dispatchMessage(Handler.java:99)
05-27 00:09:00.316: E/WindowManager(1998): at android.os.Looper.loop(Looper.java:137)
05-27 00:09:00.316: E/WindowManager(1998): at android.app.ActivityThread.main(ActivityThread.java:5041)
05-27 00:09:00.316: E/WindowManager(1998): at java.lang.reflect.Method.invokeNative(Native Method)
05-27 00:09:00.316: E/WindowManager(1998): at java.lang.reflect.Method.invoke(Method.java:511)
05-27 00:09:00.316: E/WindowManager(1998): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-27 00:09:00.316: E/WindowManager(1998): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-27 00:09:00.316: E/WindowManager(1998): at dalvik.system.NativeStart.main(Native Method)
05-27 00:09:01.296: I/Process(1998): Sending signal. PID: 1998 SIG: 9
继承人显示课程：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="id.meita.redproject"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<permission
android:name="id.meita.redproject.permission.MAPS_RECEIVE"
android:protectionLevel="signature"/>
<uses-permission android:name="id.meita.redproject.permission.MAPS_RECEIVE"/>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="AIzaSyDmKMij1Moz5C3FRs3s1gqXrVrpXjxKKEQ" />
<activity
android:name="id.meita.redproject.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
答案 0 :(得分：0)
网络超时导致的错误
05-26 01:36:50.947: W/System.err(1731): Caused by: java.net.ConnectException: failed to connect to /10.0.2.2 (port 80): connect failed: ETIMEDOUT (Connection timed out)
您确定此网址
http://10.0.2.2/api/hotelpku.php
可以通过手机访问吗？ [尝试使用移动设备上安装的常规网络浏览器打开它
额外检查：记得在清单文件中添加INTERNET权限。
<uses-permission android:name="android.permission.INTERNET" />