私はアンドロイド用のマップベースのアプリを開発しており、現在の場所を検出する最終段階にあります。しかし、今私のアプリは動作していません。エミュレータにも実機にもインストールできません。試しているときはいつでも、コンソールに次のようなメッセージが表示されます。
アプリケーション (map.apk) をインストールできません。
これは私のlogcatです:
01-14 18:08:20.576: D/dalvikvm(342): GC_FOR_MALLOC freed 4859 objects / 301296 bytes in 100ms
01-14 18:08:20.916: D/dalvikvm(342): GC_FOR_MALLOC freed 10156 objects / 616976 bytes in 96ms
01-14 18:08:21.216: D/dalvikvm(342): GC_FOR_MALLOC freed 4664 objects / 306384 bytes in 88ms
01-14 18:08:21.576: D/dalvikvm(342): GC_FOR_MALLOC freed 6137 objects / 374304 bytes in 152ms
01-14 18:08:21.956: D/dalvikvm(342): GC_FOR_MALLOC freed 8481 objects / 648904 bytes in 98ms
01-14 18:08:22.266: D/dalvikvm(342): GC_FOR_MALLOC freed 6080 objects / 370008 bytes in 98ms
01-14 18:08:22.407: D/AndroidRuntime(342): Shutting down VM
01-14 18:08:22.407: W/dalvikvm(342): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
01-14 18:08:22.427: E/AndroidRuntime(342): FATAL EXCEPTION: main
01-14 18:08:22.427: E/AndroidRuntime(342): java.lang.RuntimeException: Unable to start activity ComponentInfo{g.g.g/g.g.g.GPSLocatorActivity}: java.lang.NullPointerException
01-14 18:08:22.427: E/AndroidRuntime(342): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
01-14 18:08:22.427: E/AndroidRuntime(342): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
01-14 18:08:22.427: E/AndroidRuntime(342): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
01-14 18:08:22.427: E/AndroidRuntime(342): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
01-14 18:08:22.427: E/AndroidRuntime(342): at android.os.Handler.dispatchMessage(Handler.java:99)
01-14 18:08:22.427: E/AndroidRuntime(342): at android.os.Looper.loop(Looper.java:123)
01-14 18:08:22.427: E/AndroidRuntime(342): at android.app.ActivityThread.main(ActivityThread.java:4627)
01-14 18:08:22.427: E/AndroidRuntime(342): at java.lang.reflect.Method.invokeNative(Native Method)
01-14 18:08:22.427: E/AndroidRuntime(342): at java.lang.reflect.Method.invoke(Method.java:521)
01-14 18:08:22.427: E/AndroidRuntime(342): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
01-14 18:08:22.427: E/AndroidRuntime(342): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
01-14 18:08:22.427: E/AndroidRuntime(342): at dalvik.system.NativeStart.main(Native Method)
01-14 18:08:22.427: E/AndroidRuntime(342): Caused by: java.lang.NullPointerException
01-14 18:08:22.427: E/AndroidRuntime(342): at g.g.g.GPSLocatorActivity.onCreate(GPSLocatorActivity.java:50)
01-14 18:08:22.427: E/AndroidRuntime(342): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
01-14 18:08:22.427: E/AndroidRuntime(342): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
01-14 18:08:22.427: E/AndroidRuntime(342): ... 11 more
これは私のコードです:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mapView = (MapView) findViewById(R.id.mapView);
mapView.setTraffic(true);
mapView.setBuiltInZoomControls(true);
List<Overlay> mapOverlays = mapView.getOverlays();
Drawable drawable = this.getResources().getDrawable(R.drawable.icon);
HelloItemizedOverlay itemizedoverlay = new HelloItemizedOverlay(drawable,this);
GeoPoint point = new GeoPoint(
(int) (location.getLatitude() * 1E6),
(int) (location.getLongitude() * 1E6));
OverlayItem overlayitem = new OverlayItem(point,"","" );
itemizedoverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedoverlay);
}
@Override
protected boolean isRouteDisplayed()
{
return false;
}