嗨我每次运行我的应用程序时都会收到一个强制关闭..它允许启动闪屏，但是当我点击“查找我的位置”按钮时它会强制关闭....我发现的东西奇怪的是，当我的gps关闭时，wi-fi工作正常。我已经检查过以确保我在清单中也有正确的权限。我已经附加了logcat。我假设这个错误是在第23行的MyLocOverlay类中吗？有人可以指出我正确的方向来解决这个问题吗？ 感谢
public class MyLocOverlay extends Overlay {
private final int Radius = 5;
@Override
public void draw(Canvas canvas, MapView mapView, boolean shadow) {
Projection projection = mapView.getProjection();
if (shadow == false) {
// line below is line 23
Double lat = location.getLatitude()*1E6;
Double lng = location.getLongitude()*1E6;
GeoPoint geoPoint; geoPoint = new GeoPoint(lat.intValue(),lng.intValue());
}
}
}
logcat的
04-14 02:41:30.332: INFO/ActivityManager(102): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.irwine.touristapplication/.SplashScreen }
04-14 02:41:30.502: INFO/ActivityManager(102): Start proc com.irwine.touristapplication for activity com.irwine.touristapplication/.SplashScreen: pid=13759 uid=10060 gids={3003}
04-14 02:41:31.012: WARN/Rosie(5927): mAddHtcWidgetByOtherActivity = false, mIsOpenSlideWhenLeaveLaunch = true
04-14 02:41:31.012: WARN/InputManagerService(102): Ignoring hideSoftInput of: com.android.internal.view.IInputMethodClient$Stub$Proxy@44b033b8
04-14 02:41:31.132: WARN/InputManagerService(102): Got RemoteException sending setActive(false) notification to pid 13731 uid 10060
04-14 02:41:31.322: INFO/ActivityManager(102): Displayed activity com.irwine.touristapplication/.SplashScreen: 834 ms (total 33041 ms)
04-14 02:41:36.152: INFO/ActivityManager(102): Starting activity: Intent { cmp=com.irwine.touristapplication/.mainmenu }
04-14 02:41:36.542: INFO/ActivityManager(102): Displayed activity com.irwine.touristapplication/.mainmenu: 337 ms (total 337 ms)
04-14 02:41:40.152: INFO/ActivityManager(102): Starting activity: Intent { cmp=com.irwine.touristapplication/.gps }
04-14 02:41:42.502: INFO/MapActivity(13759): Handling network change notification:CONNECTED
04-14 02:41:42.502: ERROR/MapActivity(13759): Couldn't get connection factory client
04-14 02:41:42.752: WARN/dalvikvm(13759): threadid=1: thread exiting with uncaught exception (group=0x40028a00)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): FATAL EXCEPTION: main
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): java.lang.NullPointerException
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at com.irwine.touristapplication.MyLocOverlay.draw(MyLocOverlay.java:23)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at com.google.android.maps.Overlay.draw(Overlay.java:179)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at com.google.android.maps.OverlayBundle.draw(OverlayBundle.java:45)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at com.google.android.maps.MapView.onDraw(MapView.java:494)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.view.View.draw(View.java:6739)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.view.ViewGroup.drawChild(ViewGroup.java:1648)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1375)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1375)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.view.View.draw(View.java:6742)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.widget.FrameLayout.draw(FrameLayout.java:352)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.view.ViewGroup.drawChild(ViewGroup.java:1648)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1375)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1375)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.view.View.draw(View.java:6742)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.widget.FrameLayout.draw(FrameLayout.java:352)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1872)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.view.ViewRoot.draw(ViewRoot.java:1422)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.view.ViewRoot.performTraversals(ViewRoot.java:1167)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.view.ViewRoot.handleMessage(ViewRoot.java:1744)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.os.Handler.dispatchMessage(Handler.java:99)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.os.Looper.loop(Looper.java:143)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at android.app.ActivityThread.main(ActivityThread.java:4914)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at java.lang.reflect.Method.invokeNative(Native Method)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at java.lang.reflect.Method.invoke(Method.java:521)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
04-14 02:41:42.782: ERROR/AndroidRuntime(13759): at dalvik.system.NativeStart.main(Native Method)
04-14 02:41:42.802: WARN/ActivityManager(102): Force finishing activity com.irwine.touristapplication/.gps
04-14 02:41:42.812: WARN/ActivityManager(102): Force finishing activity com.irwine.touristapplication/.mainmenu
04-14
02:41:43.316: WARN/ActivityManager(102): Activity pause timeout for HistoryRecord{44eb0130 com.irwine.touristapplication/.gps}
04-14 02:41:44.742: INFO/Process(13759): Sending signal. PID: 13759 SIG: 9
04-14 02:41:44.752: INFO/WindowManager(102): WIN DEATH: Window{44b42110 com.irwine.touristapplication/com.irwine.touristapplication.mainmenu paused=true}
04-14 02:41:44.762: INFO/ActivityManager(102): Process com.irwine.touristapplication (pid 13759) has died.
04-14 02:41:44.772: INFO/WindowManager(102): WIN DEATH: Window{44b66298 com.irwine.touristapplication/com.irwine.touristapplication.gps paused=false}
04-14 02:41:53.654: WARN/ActivityManager(102): Activity destroy timeout for HistoryRecord{44bd91e8 com.irwine.touristapplication/.mainmenu}
04-14 02:41:53.699: WARN/ActivityManager(102): Activity destroy timeout for HistoryRecord{44eb0130 com.irwine.touristapplication/.gps}
答案 0 :(得分：1)
您说您拥有正确的权限。只是为了确定，您知道位置有两种不同的权限吗？
String ACCESS_COARSE_LOCATION允许应用程序访问粗略（例如，Cell-ID，WiFi）位置 字符串ACCESS_FINE_LOCATION允许应用程序访问精细（例如GPS）位置
答案 1 :(得分：0)
这很重要
EXCEPTION: main 04-14 02:41:42.782: ERROR/AndroidRuntime(13759): java.lang.NullPointerException
ERROR/AndroidRuntime(13759): at com.irwine.touristapplication.MyLocOverlay.draw(MyLocOverlay.java:23)
如果我不得不猜测，我会说你的位置是空的。尝试在调试模式下运行，看看你能找到什么。我的建议是在错误行之前设置一个断点并查看变量是什么..如果你的位置变量为null，那就是你的问题，解决这个问题的方法就是保持ping，直到你得到它为止。
解决方案是检查位置是否为空..如果它为null，则表示您需要再次请求该位置。如果您尝试ping 20s并且没有得到任何东西，请继续ping，直到获得某些东西。理想情况下，您希望它在5次尝试后超时...... 这是因为如果您经常ping通，用户会讨厌您。然而;如果100分过去并且您没有获得位置，则超时并让用户再次请求该位置或要求他们稍后再试。
<强>更新
具体来说，我看到了这个错误。以下是我将如何处理它：
申请地点 - ＆gt;通过位置监听器等待位置 - ＆gt;收到位置后，再更新叠加层。
只要返回的位置为空，就继续请求。像我说的那样超时。
以下是一个例子：
我的LocationListener类：
public class myLocationListener implements LocationListener {
Location L;
public void onLocationChanged(Location arg0) {
Toast.makeText(getApplicationContext(), "Location has changed",
Toast.LENGTH_SHORT).show();
L = arg0;
updateNewLocation(L);
}}
我打电话的功能：
public void updateNewLocation(Location loc) {
// while the location is not null get latitude and longitude
// information
// :: Null means that the GPS provider is off or there is an issue
if (loc != null) {}}
我用来请求位置以及超时的函数体：
Toast.makeText(getApplicationContext(),
"Searching for your location.", Toast.LENGTH_SHORT)
.show();
locationManager.requestLocationUpdates(provider, 20000, 5,
locationListener);
// Thread to count until timeout (15 * 5000ms)
Thread t = new Thread(new Runnable() {
public void run() {
count = 0;
for (int i = 0; i < 15; i++) {
if (locationListener.L == null) {
try {
handler.sendMessage(handler
.obtainMessage());
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
帮助处理超时的处理程序
Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
count++;
if (count == 15) {
error();
count = 0;
}
}
};