Question

最近我正在做一个有导航抽屉的应用程序，我有一些项目，如果clik它应该打开一个地图活动但是这样做我的应用程序停止并显示以下错误：< / p>

FATAL EXCEPTION: main
Process: jocadoci.soloordena, PID: 2897 
java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0 
  at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255) 
  at java.util.ArrayList.get(ArrayList.java:308) 
  at jocadoci.soloordena.MapsItaly.geoLocate(MapsItaly.java:99) 
  at jocadoci.soloordena.MapsItaly.onMapReady(MapsItaly.java:73) 
  at com.google.android.gms.maps.SupportMapFragment$zza$1.zza(Unknown Source) 
  at com.google.android.gms.maps.internal.zzt$zza.onTransact(Unknown Source) 
  at android.os.Binder.transact(Binder.java:380) 
  at wl.a(:com.google.android.gms.DynamiteModulesB:82) 
  at maps.ad.t$5.run(Unknown Source) 
  at android.os.Handler.handleCallback(Handler.java:739) 
  at android.os.Handler.dispatchMessage(Handler.java:95) 
  at android.os.Looper.loop(Looper.java:135) 
  at android.app.ActivityThread.main(ActivityThread.java:5254) 
  at java.lang.reflect.Method.invoke(Native Method) 
  at java.lang.reflect.Method.invoke(Method.java:372) 
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

我认为错误是因为在map活动中我有以下使用android studio创建的ArrayList.java的类。

private void geoLocate() throws IOException {
    String location = "comida rapida y pizza";
    Geocoder gc = new Geocoder(this);
    List<Address> list = new ArrayList<>(gc.getFromLocationName(location, 1));
    Address address = list.get(0);
    String locality = address.getLocality();

    Toast.makeText(this, locality, Toast.LENGTH_SHORT).show();

    double lat = address.getLatitude();
    double lng = address.getLongitude();
    goToLocationZoom(lat, lng, 16);

}

但我不确定错误是什么。我感谢任何帮助，并提前感谢：）

Answer 1

如果未找到匹配项或没有可用的后端服务（documentation），

Geocoder.getFromLocationName将返回null或空列表。

因此，要解决您的问题，您必须检查是否有可用的结果：

private void geoLocate() throws IOException {
    String location = "comida rapida y pizza";
    Geocoder gc = new Geocoder(this);
    List<Address> list = new ArrayList<>(gc.getFromLocationName(location, 1));

    if (list != null && list.size() > 0) {
        Address address = list.get(0);
        String locality = address.getLocality();

        Toast.makeText(this, locality, Toast.LENGTH_SHORT).show();

        double lat = address.getLatitude();
        double lng = address.getLongitude();
        goToLocationZoom(lat, lng, 16);
    } else {
        Toast.makeText(this, "No results found", Toast.LENGTH_SHORT).show();
    }
}

单击导航抽屉中的项目后尝试启动地图活动

1 个答案: