我正在将json数据导入mapview，但每当我运行我的应用程序时，不幸的是appname已停止，这里我在我的项目中使用mapviewballoons库，但我没有得到任何编程错误，代码工作正常并且logcat说：
10-22 14:46:35.115: D/dalvikvm(718): GC_CONCURRENT freed 177K, 4% free 8260K/8519K, paused 32ms+5ms, total 87ms
10-22 14:46:35.115: D/dalvikvm(718): WAIT_FOR_CONCURRENT_GC blocked 44ms
10-22 14:46:35.124: W/CursorWrapperInner(718): Cursor finalized without prior close()
10-22 14:46:35.124: W/CursorWrapperInner(718): Cursor finalized without prior close()
10-22 14:46:35.274: D/AndroidRuntime(718): Shutting down VM
10-22 14:46:35.285: W/dalvikvm(718): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
10-22 14:46:35.314: E/AndroidRuntime(718): FATAL EXCEPTION: main
10-22 14:46:35.314: E/AndroidRuntime(718): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.json.mapview/com.example.json.mapview.Main}: android.os.NetworkOnMainThreadException
10-22 14:46:35.314: E/AndroidRuntime(718): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
10-22 14:46:35.314: E/AndroidRuntime(718): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
10-22 14:46:35.314: E/AndroidRuntime(718): at android.app.ActivityThread.access$600(ActivityThread.java:130)
10-22 14:46:35.314: E/AndroidRuntime(718): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
10-22 14:46:35.314: E/AndroidRuntime(718): at android.os.Handler.dispatchMessage(Handler.java:99)
10-22 14:46:35.314: E/AndroidRuntime(718): at android.os.Looper.loop(Looper.java:137)
10-22 14:46:35.314: E/AndroidRuntime(718): at android.app.ActivityThread.main(ActivityThread.java:4745)
10-22 14:46:35.314: E/AndroidRuntime(718): at java.lang.reflect.Method.invokeNative(Native Method)
10-22 14:46:35.314: E/AndroidRuntime(718): at java.lang.reflect.Method.invoke(Method.java:511)
10-22 14:46:35.314: E/AndroidRuntime(718): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
10-22 14:46:35.314: E/AndroidRuntime(718): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-22 14:46:35.314: E/AndroidRuntime(718): at dalvik.system.NativeStart.main(Native Method)
10-22 14:46:35.314: E/AndroidRuntime(718): Caused by: android.os.NetworkOnMainThreadException
10-22 14:46:35.314: E/AndroidRuntime(718): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
10-22 14:46:35.314: E/AndroidRuntime(718): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
10-22 14:46:35.314: E/AndroidRuntime(718): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
10-22 14:46:35.314: E/AndroidRuntime(718): at java.net.InetAddress.getAllByName(InetAddress.java:214)
10-22 14:46:35.314: E/AndroidRuntime(718): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
10-22 14:46:35.314: E/AndroidRuntime(718): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
10-22 14:46:35.314: E/AndroidRuntime(718): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
10-22 14:46:35.314: E/AndroidRuntime(718): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
10-22 14:46:35.314: E/AndroidRuntime(718): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
10-22 14:46:35.314: E/AndroidRuntime(718): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
10-22 14:46:35.314: E/AndroidRuntime(718): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
10-22 14:46:35.314: E/AndroidRuntime(718): at com.example.json.mapview.Main.onCreate(Main.java:64)
10-22 14:46:35.314: E/AndroidRuntime(718): at android.app.Activity.performCreate(Activity.java:5008)
10-22 14:46:35.314: E/AndroidRuntime(718): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
10-22 14:46:35.314: E/AndroidRuntime(718): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
10-22 14:46:35.314: E/AndroidRuntime(718): ... 11 more
10-22 14:46:35.433: D/dalvikvm(718): GC_CONCURRENT freed 130K, 3% free 8629K/8839K, paused 23ms+36ms, total 177ms
10-22 14:51:35.465: I/Process(718): Sending signal. PID: 718 SIG: 9
10-22 14:52:57.604: E/Trace(743): error opening trace file: No such file or directory (2)
10-22 14:52:58.524: D/dalvikvm(743): GC_CONCURRENT freed 181K, 4% free 8260K/8519K, paused 25ms+4ms, total 118ms
10-22 14:52:58.524: D/dalvikvm(743): WAIT_FOR_CONCURRENT_GC blocked 73ms
10-22 14:52:58.534: W/CursorWrapperInner(743): Cursor finalized without prior close()
10-22 14:52:58.534: W/CursorWrapperInner(743): Cursor finalized without prior close()
10-22 14:52:58.724: D/AndroidRuntime(743): Shutting down VM
10-22 14:52:58.724: W/dalvikvm(743): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
10-22 14:52:58.764: E/AndroidRuntime(743): FATAL EXCEPTION: main
10-22 14:52:58.764: E/AndroidRuntime(743): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.json.mapview/com.example.json.mapview.Main}: android.os.NetworkOnMainThreadException
10-22 14:52:58.764: E/AndroidRuntime(743): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
10-22 14:52:58.764: E/AndroidRuntime(743): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
10-22 14:52:58.764: E/AndroidRuntime(743): at android.app.ActivityThread.access$600(ActivityThread.java:130)
10-22 14:52:58.764: E/AndroidRuntime(743): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
10-22 14:52:58.764: E/AndroidRuntime(743): at android.os.Handler.dispatchMessage(Handler.java:99)
10-22 14:52:58.764: E/AndroidRuntime(743): at android.os.Looper.loop(Looper.java:137)
10-22 14:52:58.764: E/AndroidRuntime(743): at android.app.ActivityThread.main(ActivityThread.java:4745)
10-22 14:52:58.764: E/AndroidRuntime(743): at java.lang.reflect.Method.invokeNative(Native Method)
10-22 14:52:58.764: E/AndroidRuntime(743): at java.lang.reflect.Method.invoke(Method.java:511)
10-22 14:52:58.764: E/AndroidRuntime(743): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
10-22 14:52:58.764: E/AndroidRuntime(743): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-22 14:52:58.764: E/AndroidRuntime(743): at dalvik.system.NativeStart.main(Native Method)
10-22 14:52:58.764: E/AndroidRuntime(743): Caused by: android.os.NetworkOnMainThreadException
10-22 14:52:58.764: E/AndroidRuntime(743): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
10-22 14:52:58.764: E/AndroidRuntime(743): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
10-22 14:52:58.764: E/AndroidRuntime(743): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
10-22 14:52:58.764: E/AndroidRuntime(743): at java.net.InetAddress.getAllByName(InetAddress.java:214)
10-22 14:52:58.764: E/AndroidRuntime(743): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
10-22 14:52:58.764: E/AndroidRuntime(743): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
10-22 14:52:58.764: E/AndroidRuntime(743): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
10-22 14:52:58.764: E/AndroidRuntime(743): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
10-22 14:52:58.764: E/AndroidRuntime(743): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
10-22 14:52:58.764: E/AndroidRuntime(743): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
10-22 14:52:58.764: E/AndroidRuntime(743): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
10-22 14:52:58.764: E/AndroidRuntime(743): at com.example.json.mapview.Main.onCreate(Main.java:64)
10-22 14:52:58.764: E/AndroidRuntime(743): at android.app.Activity.performCreate(Activity.java:5008)
10-22 14:52:58.764: E/AndroidRuntime(743): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
10-22 14:52:58.764: E/AndroidRuntime(743): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
10-22 14:52:58.764: E/AndroidRuntime(743): ... 11 more
10-22 14:52:58.866: D/dalvikvm(743): GC_CONCURRENT freed 130K, 3% free 8629K/8839K, paused 30ms+5ms, total 162ms
清单： -
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.json.mapview"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".Main"
android:label="@string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<uses-library android:name="com.google.android.maps" />
</application>
</manifest>
Java代码： -
public class Main extends MapActivity {
public GeoPoint point;
TapControlledMapView mapView; // use the custom TapControlledMapView
List<Overlay> mapOverlays;
Drawable drawable;
SimpleItemizedOverlay itemizedOverlay;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mapView = (TapControlledMapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true);
mapView.setSatellite(false);
// dismiss balloon upon single tap of MapView (iOS behavior)
mapView.setOnSingleTapListener(new OnSingleTapListener() {
public boolean onSingleTap(MotionEvent e) {
itemizedOverlay.hideAllBalloons();
return true;
}
});
mapOverlays = mapView.getOverlays();
drawable = getResources().getDrawable(R.drawable.ic_launcher);
itemizedOverlay = new SimpleItemizedOverlay(drawable, mapView);
itemizedOverlay.setShowClose(false);
itemizedOverlay.setShowDisclosure(true);
itemizedOverlay.setSnapToCenter(false);
HttpClient client = new DefaultHttpClient();
// Perform a GET request for a JSON list
HttpUriRequest request = new HttpGet("https://dl.xxx.com/maps.json");
// Get the response that sends back
HttpResponse response = null;
try {
response = client.execute(request);
} catch (ClientProtocolException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
// Convert this response into a readable string
String jsonString = null;
try {
jsonString = StreamUtils.convertToString(response.getEntity().getContent());
} catch (IllegalStateException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
// Create a JSON object that we can use from the String
JSONObject json = null;
try {
json = new JSONObject(jsonString);
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try{
JSONArray jsonArray = json.getJSONArray("maps");
Log.e("log_tag", "Opening JSON Array ");
for(int i=0;i < jsonArray.length();i++){
JSONObject jsonObject = jsonArray.getJSONObject(i);
String latitude = jsonObject.getString("latitude");
String longitude = jsonObject.getString("longitude");
String title = jsonObject.getString("title");
String country = jsonObject.getString("country");
double lat = Double.parseDouble(latitude);
double lng = Double.parseDouble(longitude);
Log.e("log_tag", "ADDING GEOPOINT"+title);
point = new GeoPoint(
(int) (lat * 1E6),
(int) (lng * 1E6));
OverlayItem overlayItem = new OverlayItem(point, title,
country);
itemizedOverlay.addOverlay(overlayItem);
}
}catch(JSONException e) {
Log.e("log_tag", "Error parsing data "+e.toString());
}
itemizedOverlay.populateNow();
mapOverlays.add(itemizedOverlay);
if (savedInstanceState == null) {
MapController controller = mapView.getController();
controller.setCenter(point);
controller.setZoom(7);
} else {
// example restoring focused state of overlays
int focused;
focused = savedInstanceState.getInt("focused_1", -1);
if (focused >= 0) {
itemizedOverlay.setFocus(itemizedOverlay.getItem(focused));
}
} }
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
}
注意： - 每当我调试我的应用程序获取ActivityThread ....找不到源码时，行： - 2059
答案 0 :(得分：0)
不应在主UI线程中执行与网络相关的活动。如果这样做，应用程序将崩溃。
使用异步任务或启动新线程来获取JSON数据
更具体的尝试以下内容。在onCreate函数中，从DefaultHttpClient部分开始，在这里包含它们。
new Runnable() {
@Override
public void run() {
//Include the code here.
}
};
谢谢＆amp;问候， Rajamanickem。小号
答案 1 :(得分：0)
日志中明确提到了这一点 引起：android.os.NetworkOnMainThreadException
答案 2 :(得分：0)
这：
HttpClient client = new DefaultHttpClient();
// Perform a GET request for a JSON list
HttpUriRequest request = new HttpGet("https://dl.xxx.com/maps.json");
// Get the response that sends back
HttpResponse response = null;
try {
response = client.execute(request);
} catch (ClientProtocolException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
摆脱它。
阅读Processes and Threads这将描述如何处理诸如与网络通信或从流写入/读取之类的事情。不要在UI线程上放置这种类型的代码或期望睡眠，超时或锁定获取（这是任何生命周期方法，onCreate（），onResume（），onPause（）...）。