标签: android-maps

我有以下课程。

public abstract class AbstractMapFragment extends SupportMapFragment implements OnMapReadyCallback

不幸的是，但由于未知的原因，该类带有红色下划线，并且出现以下消息：Cannot access androidx.savedstate.SavedStateRegistryOwner。

我该如何修复它？

我一直在Google和SO上研究这个问题,但是我被卡住了,我想我错过了一些基本的东西.我见过的大多数例子都没有处理任意mapWidth和单个点,只是Overlay的跨度.

我有一个地图点数据库,a MapView和a Geocoder.我可以在我的应用程序中搜索邮政编码,Address并由我的Geocoder.

使用这个Address,我可以构建一个GeoPoint并搜索我的数据库并获取附近点的列表.问题来自于尝试使用从返回Address点构造的跨度以及到数据库中最近点的距离来设置zoomToSpan .

我只希望跨度包含最近的两个点(如果可用).这是相关的代码:

Collections.sort(listingDisplay, mComparator);
    listingDisplayAdapter.notifyDataSetChanged();

    float spanWidth =0;

    if (listingDisplay.size() > 1) {

        spanWidth = (float) (2 * distanceFromPoint(listingDisplay.get(1),
                current));

    } else if (listingDisplay.size() == 1) {

        spanWidth = (float) (2 * distanceFromPoint(listingDisplay.get(0),
                current));

    }

    Log.v(TAG, "SpanWidth: " + spanWidth);

    // Create span
    int minLat = (int) (current.getLatitudeE6() - (spanWidth * 1E6) / 2);
    int maxLat = (int) (current.getLatitudeE6() + (spanWidth …

我正在活动中显示地图......但是当我在设备上运行应用程序时它没有显示任何内容,它只显示白屏并放大缩小选项... MAP键是正确的...谢谢..

AndroidManifest.xml中

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.edxample.finalmap"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />



     <permission android:name="com.edxample.finalmap.permission.MAPS_RECEIVE"
         android:protectionLevel="signature" />
     <uses-permission android:name="com.edxample.finalmap.permission.MAPS_RECEIVE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <uses-feature android:glEsVersion="0x00020000"
        android:required="true" />




    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.edxample.finalmap.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyBL8ANi3jKkM0tF65C_Qus2_JgWRzClhfU" />

    </application>

</manifest>

activity_main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

     <fragment
        android:id="@+id/map"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        xmlns:map="http://schemas.andoid.com/apk/es-auto" …

我是android新手,现在正在使用Google maps v2,我使用tabhost来显示Google map v2,在这个tabhost中我需要在不同的标签上显示两个Google maps v2.当我切换标签b/w两个包含地图的标签时,它会重叠.我不知道要克服这个问题.

//代码在这里用于两个选项卡

    mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
            .getMap();
    mMap.setMyLocationEnabled(true);

    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    //locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME, MIN_DISTANCE, this);
    Log.e("locamanager",""+locationManager);
    Criteria criteria=new Criteria(); // object to retrieve provider
    String provider = locationManager.getBestProvider(criteria, true);
    Location location=locationManager.getLastKnownLocation(provider);
    if(location!=null){
        onLocationChanged(location);
    }
    locationManager.requestLocationUpdates(provider, 400, 1000, this);


 }


@Override
public void onLocationChanged(Location location) {

    latLng = new LatLng(location.getLatitude(), location.getLongitude());
    Log.e("latlng",""+latLng);
    cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, 15);
    mMap.animateCamera(cameraUpdate);
    locationManager.removeUpdates(this);

    new ReverseGeocodingTask(getBaseContext()).execute(latLng);

}

有人有解决方案请帮帮我

感谢Advance

这些方法有什么区别

public final void moveCamera(CameraUpdate update)和public final void animateCamera(CameraUpdate update)

GoogleMap类？

我什么时候应该调用getCameraPosition()？

package com.example.mukesh.airpollution;




import android.graphics.Color;
import android.os.Bundle;
 import android.support.v4.app.FragmentActivity;

import com.google.android.gms.maps.CameraUpdateFactory;
  import com.google.android.gms.maps.GoogleMap;
  import com.google.android.gms.maps.GoogleMap.OnMapClickListener;
 import com.google.android.gms.maps.MapFragment;
 import com.google.android.gms.maps.OnMapReadyCallback;
 import com.google.android.gms.maps.model.CameraPosition;
 import com.google.android.gms.maps.model.LatLng;
 import com.google.android.gms.maps.model.LatLngBounds;
 import com.google.android.gms.maps.model.Polygon;
 import com.google.android.gms.maps.model.PolygonOptions;
 import com.google.maps.android.PolyUtil;
 import java.util.List;

 import java.util.ArrayList;

 public class MapsActivity extends FragmentActivity
    implements OnMapClickListener, OnMapReadyCallback {

//final int RQS_GooglePlayServices = 1;
private GoogleMap mMap;
//private GoogleMap googleMap;



boolean markerClicked;
PolygonOptions polygonOptions;
Polygon polygon;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_maps);
    // Obtain the SupportMapFragment and get notified when the map is      ready …