Question

我试图在我的Android应用程序上实现街景，并遵循文档和Google API说明...它符合罚款并且没有问题但是当我尝试在我的Android应用程序上运行它时由于无法运行而崩溃执行这一行

 streetViewPanoramaFragment.getStreetViewPanoramaAsync(this);

我的Google Play服务，权限和API密钥都是正确的，因为我事先制作了一张地图，只是评论出来尝试这一点，但它发送似乎有效并且无法弄清楚为什么

    public class Maps extends Activity implements OnStreetViewPanoramaReadyCallback {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_maps);

    /*GoogleMap map = ((MapFragment) getFragmentManager().findFragmentById(R.id.mapping)).getMap();
    LatLngBounds bounds = new LatLngBounds(
            new LatLng(54.001615, -2.794561), // South west corner
            new LatLng(54.001615, -2.782674)); // North east corner
    map.setMyLocationEnabled(true);
    map.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(54.00908, -2.787565), 14));
    map.addMarker(new MarkerOptions()
            .title("Lancaster Campus")
            .snippet("LUCM")
            .position(new LatLng(40.716216, -74.213393)));
    CameraPosition INIT =
            new CameraPosition.Builder()
                    .target(new LatLng(54.00908, -2.787565))
                    .zoom(25.5F)
                    .bearing(300F) // orientation
                    .tilt(50F) // viewing angle
                    .build();
    map.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
    map.setTrafficEnabled(true);
    map.setBuildingsEnabled(true);*/

    StreetViewPanoramaFragment streetViewPanoramaFragment =
            ((StreetViewPanoramaFragment) getFragmentManager()
                    .findFragmentById(R.id.streetviewpanorama));
    streetViewPanoramaFragment.getStreetViewPanoramaAsync(this);

}

public void onStreetViewPanoramaReady(StreetViewPanorama panorama) {
    panorama.setPosition(new LatLng(-33.87365, 151.20689));
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_maps, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}


 }

片段

 <fragment
android:name="com.google.android.gms.maps.StreetViewPanoramaFragment"
android:id="@+id/streetviewpanorama"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android" />

活动xml链接到类

 <?xml version="1.0" encoding="utf-8"?>
 <fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/mapping"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.google.android.gms.maps.MapFragment"/>

清单元数据

    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />
    <meta-data
        android:name="com.google.android.maps.v2.API_KEY"
        android:value="*my api key*" />

错误

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.StreetViewPanoramaFragment.getStreetViewPanoramaAsync(com.google.android.gms.maps.OnStreetViewPanoramaReadyCallback)' on a null object reference
        at harman.com.lufr.Maps.onCreate(Maps.java:68)

Answer 1

streetViewPanoramaFragment为空。

您确定已将片段添加到xml并且您的ID与R.id.streetviewpanorama匹配吗？

<fragment
    android:name="com.google.android.gms.maps.StreetViewPanoramaFragment"
    android:id="@+id/streetviewpanorama"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

修改

您的活动xml中缺少
StreetViewPanoramaFragment。

Answer 2

这对我有用。

streetViewPanoramaFragment.getStreetViewPanoramaAsync(
    new OnStreetViewPanoramaReadyCallback() {
        @Override
        public void onStreetViewPanoramaReady(StreetViewPanorama panorama) {   
            // Do what you want to do here.
        }
    }
);

StreeViewPanorama Api v2返回null

2 个答案: