单击地图视图中的覆盖项目时崩溃

Question

    @Override
protected void onCreate(Bundle arg0) {
    super.onCreate(arg0);
    setContentView(R.layout.map);
    MapView mapView = (MapView) findViewById(R.id.mapview);
    mapView.setBuiltInZoomControls(true);
    badplatsName = getIntent().getStringExtra("se.brickit.badplatsen.badplatsname");
    lat = getIntent().getIntExtra("se.brickit.badplatsen.lat",0);
    lon = getIntent().getIntExtra("se.brickit.badplatsen.lon",0);

    List<Overlay> mapOverlays = mapView.getOverlays();
    Drawable drawable = this.getResources().getDrawable(R.drawable.smiley_flask);
    BrMapViewItemOverlay itemizedoverlay = new BrMapViewItemOverlay(drawable);
    GeoPoint point = new GeoPoint(lat,lon);
    OverlayItem overlayitem = new OverlayItem(point, badplatsName, "");
    itemizedoverlay.addOverlay(overlayitem);
    mapOverlays.add(itemizedoverlay);
    mapView.getController().animateTo(point);
    mapView.getController().zoomToSpan(6, 6);
    mapView.setSatellite(true);
}

当我单击覆盖项目时，应用程序崩溃。有人知道原因吗？

logcat 也有点奇怪，因为它似乎试图启动一个活动，但我想要它做的就是在单击时显示一个带有名称的框。

07-20 14:36:56.303: ERROR/AndroidRuntime(15856): FATAL EXCEPTION: main
07-20 14:36:56.303: ERROR/AndroidRuntime(15856): java.lang.NullPointerException
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at com.android.internal.app.AlertController$AlertParams.<init>(AlertController.java:743)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at android.app.AlertDialog$Builder.<init>(AlertDialog.java:273)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at se.brickit.badplatsen.BrMapViewItemOverlay.onTap(BrMapViewItemOverlay.java:43)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at com.google.android.maps.ItemizedOverlay.onTap(ItemizedOverlay.java:453)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at com.google.android.maps.OverlayBundle.onTap(OverlayBundle.java:83)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at com.google.android.maps.MapView$1.onSingleTapUp(MapView.java:347)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at com.google.android.maps.GestureDetector.onTouchEvent(GestureDetector.java:533)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at com.google.android.maps.MapView.onTouchEvent(MapView.java:647)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at android.view.View.dispatchTouchEvent(View.java:3765)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:905)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:944)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:944)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:944)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1701)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1116)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at android.app.Activity.dispatchTouchEvent(Activity.java:2093)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1685)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1802)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at android.os.Handler.dispatchMessage(Handler.java:99)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at android.os.Looper.loop(Looper.java:144)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at android.app.ActivityThread.main(ActivityThread.java:4937)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at java.lang.reflect.Method.invokeNative(Native Method)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at java.lang.reflect.Method.invoke(Method.java:521)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
07-20 14:36:56.303: ERROR/AndroidRuntime(15856):     at dalvik.system.NativeStart.main(Native Method)
07-20 14:36:58.163: ERROR/ActivityManager(96): fail to set top app changed!
07-20 14:36:58.243: ERROR/AndroidRuntime(15896): FATAL EXCEPTION: main
07-20 14:36:58.243: ERROR/AndroidRuntime(15896): java.lang.RuntimeException: Unable to start activity ComponentInfo{se.brickit.badplatsen/se.brickit.badplatsen.Tabs}: android.content.res.Resources$NotFoundException: Resource ID #0x0
07-20 14:36:58.243: ERROR/AndroidRuntime(15896):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2787)
07-20 14:36:58.243: ERROR/AndroidRuntime(15896):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2803)
07-20 14:36:58.243: ERROR/AndroidRuntime(15896):     at android.app.ActivityThread.access$2300(ActivityThread.java:135)
07-20 14:36:58.243: ERROR/AndroidRuntime(15896):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2136)
07-20 14:36:58.243: ERROR/AndroidRuntime(15896):     at android.os.Handler.dispatchMessage(Handler.java:99)
07-20 14:36:58.243: ERROR/AndroidRuntime(15896):     at android.os.Looper.loop(Looper.java:144)
07-20 14:36:58.243: ERROR/AndroidRuntime(15896):     at android.app.ActivityThread.main(ActivityThread.java:4937)
07-20 14:36:58.243: ERROR/AndroidRuntime(15896):     at java.lang.reflect.Method.invokeNative(Native Method)
07-20 14:36:58.243: ERROR/AndroidRuntime(15896):     at java.lang.reflect.Method.invoke(Method.java:521)
07-20 14:36:58.243: ERROR/AndroidRuntime(15896):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
07-20 14:36:58.243: ERROR/AndroidRuntime(15896):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
07-20 14:36:58.243: ERROR/AndroidRuntime(15896):     at dalvik.system.NativeStart.main(Native Method)
07-20 14:36:58.243: ERROR/AndroidRuntime(15896): Caused by: android.content.res.Resources$NotFoundException: Resource ID #0x0
07-20 14:36:58.243: ERROR/AndroidRuntime(15896):     at android.content.res.Resources.getValue(Resources.java:892)
07-20 14:36:58.243: ERROR/AndroidRuntime(15896):     at android.content.res.Resources.getDrawable(Resources.java:580)
07-20 14:36:58.243: ERROR/AndroidRuntime(15896):     at se.brickit.badplatsen.Tabs.onCreate(Tabs.java:192)
07-20 14:36:58.243: ERROR/AndroidRuntime(15896):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1069)
07-20 14:36:58.243: ERROR/AndroidRuntime(15896):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2751)
07-20 14:36:58.243: ERROR/AndroidRuntime(15896):     ... 11 more
07-20 14:37:00.053: ERROR/ClockWidget(209): weatherClock onReceive~ mUseAnimation:false
07-20 14:37:00.053: ERROR/ClockWidget(209): weatherClock onReceive~ mUseAnimation:false

PS 这里是覆盖类：

public class BrMapViewItemOverlay extends ItemizedOverlay {
private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
private Context mContext;

public BrMapViewItemOverlay(Drawable defaultMarker) {
    super(boundCenterBottom(defaultMarker));
}

public BrMapViewItemOverlay(Drawable defaultMarker, Context context) {
    super(defaultMarker);
    mContext = context;
}

public void addOverlay(OverlayItem overlay) {
    mOverlays.add(overlay);
    populate();
}

@Override
protected OverlayItem createItem(int i) {
    return mOverlays.get(i);
}

@Override
public int size() {
    return mOverlays.size();
}

@Override
protected boolean onTap(int index) {
    OverlayItem item = mOverlays.get(index);
    AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
    dialog.setTitle(item.getTitle());
    dialog.setMessage(item.getSnippet());
    dialog.show();
    return true;
}

}

Answer 1

将此行

BrMapViewItemOverlay itemizedoverlay = new BrMapViewItemOverlay(drawable);

替换为

 BrMapViewItemOverlay itemizedoverlay = new BrMapViewItemOverlay(drawable, this);

您尚未传递上下文，因此膨胀 AlertDialog 会导致失败。

Answer 2

从 logcat 输出中，我可以说您的 Tabs.java 文件中的行号 192 存在问题，在同一行中，我确信您正在尝试引用任何资源，如字符串、颜色、可绘制对象或任何资源，但它给出 ResourceNotFoundException 只是因为它实际上没有获取该资源的 ID。

只是为了尝试，执行 project -> clean 以便再次构建项目。这只是我的猜测，因为我也做过很多次。

简而言之，只需检查 Tabs.java 文件中的第 192 行即可。