不幸的是，在我為自己的Android應用將Google Maps v1更新為Google Maps v2之后，Google Maps無法加載

Question

注意：1.當我將Maps V2用作獨立應用程序時，它可以正常工作。 但是，當我使用Maps V2（這是我的項目的子活動）時，出現以下提到的錯誤日志。 2.我的應用程序可以在Map v1上正常工作，但是我想將我的應用程序從Map V1升級到V2

添加了下面提到的代碼來調用地圖活動：嘗試{Class.forName（“ com.google.android.gms.maps.SupportMapFragment ”）; Intent n = new Intent（Information.this，Gmaps.class）; n.setFlags（Intent.FLAG_ACTIVITY_REORDER_TO_FRONT）; startActivity（n）; }

按照以下步驟將Google Maps v1升級到v2

1. 在我的項目中添加了google-play-services.jar。
2. 在我的Android SDK設置文件夾的extras文件夾下添加了名為named_ google-play-services_lib的庫
   到我的Android項目。
3. 如下所示更新了map.xml鏈接
4. 如下所示更新了Androidmanifiedt.xml鏈接

http://javapapers.com/android/android-show-current-location-on-map-using-google-maps-api/ http://www.vogella.com/tutorials/AndroidGoogleMaps/article.html

我的地圖活動課程

public class Information extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        Crittercism.init(getApplicationContext(), "CRITTERCISM_APP_ID");
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);     
        playInformation();        

    }//oncreate
    private void playInformation(){
        try{
                Class.forName("com.google.android.gms.maps.SupportMapFragment");
                Intent n=new Intent(Information.this,Gmaps.class);
                n.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
                startActivity(n);
            }catch(Exception e){
                e.printStackTrace();
                setContentView(R.layout.error);
                TextView tv = (TextView)findViewById(R.id.txtError);
                tv.setText("Maps Does Not Supported By This Device");
                tv.setTextSize(26);
            }
    }
}

public class Gmaps extends FragmentActivity {

    // Google Map
    private GoogleMap googleMap;

    private Marker marker;

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

        try {
            // Loading map
            initilizeMap();

            // Changing map type
            googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);

            // Showing / hiding your current location
            googleMap.setMyLocationEnabled(true);

            // Enable / Disable zooming controls
            googleMap.getUiSettings().setZoomControlsEnabled(false);

            // Enable / Disable my location button
            googleMap.getUiSettings().setMyLocationButtonEnabled(true);

            // Enable / Disable Compass icon
            googleMap.getUiSettings().setCompassEnabled(true);

            // Enable / Disable Rotate gesture
            googleMap.getUiSettings().setRotateGesturesEnabled(true);

            // Enable / Disable zooming functionality
            googleMap.getUiSettings().setZoomGesturesEnabled(true);

            double lat=12.9667; double lon=77.5667;

             // Adding a marker
            addMarker(googleMap, lat, lon);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        initilizeMap();
    }

    /**
     * function to load map If map is not created it will create it for you
     * */
    private void initilizeMap() {
        if (googleMap == null) {
            //googleMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
             googleMap = ((SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map)).getMap();

            // check if map is created successfully or not
            if (googleMap == null) {
                Toast.makeText(getApplicationContext(),
                        "Sorry! unable to create maps", Toast.LENGTH_SHORT).show();
            }
        }
    }

    public void addMarker(GoogleMap googleMap, double lat, double lon)
    {

        if (marker != null) {
            marker.remove();
        }

        // Adding a marker
        MarkerOptions myMarker = new MarkerOptions().position(
                new LatLng(lat, lon))
                .title("Hello Bengaluru ");

        // changing marker color
        myMarker.icon(BitmapDescriptorFactory
                .defaultMarker(BitmapDescriptorFactory.HUE_RED));

        marker = googleMap.addMarker(myMarker);

        // Move the camera to last position with a zoom level
        CameraPosition cameraPosition = new CameraPosition.Builder()
                    .target(new LatLng(lat, lon)).zoom(16).build();

        googleMap.animateCamera(CameraUpdateFactory
                    .newCameraPosition(cameraPosition));
    }
}

我將地圖用作我的應用程序的子活動，並在實現了上面的代碼並達到了給定的錯誤日志之后

********
11-10 20:03:42.659: W/dalvikvm(9654): Unable to resolve superclass of Lcom/google/android/gms/maps/SupportMapFragment; (168)
11-10 20:03:42.659: W/dalvikvm(9654): Link of class 'Lcom/google/android/gms/maps/SupportMapFragment;' failed
11-10 20:03:42.659: W/System.err(9654): java.lang.ClassNotFoundException: com.google.android.gms.maps.SupportMapFragment
11-10 20:03:42.659: W/System.err(9654): at java.lang.Class.classForName(Native Method)
11-10 20:03:42.659: W/System.err(9654): at java.lang.Class.forName(Class.java:217)
11-10 20:03:42.659: W/System.err(9654): at java.lang.Class.forName(Class.java:172)
11-10 20:03:42.669: W/System.err(9654): at com.example.myApp.Information.playInformation(Information.java:594)
11-10 20:03:42.669: W/System.err(9654): at com.example.myApp.Information.onCreate(Information.java:294)
11-10 20:03:42.669: W/System.err(9654): at android.app.Activity.performCreate(Activity.java:4470) 
11-10 20:03:42.669: W/System.err(9654): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1053)
11-10 20:03:42.669: W/System.err(9654): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1934)
11-10 20:03:42.669: W/System.err(9654): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995)
11-10 20:03:42.669: W/System.err(9654): at android.app.ActivityThread.access$600(ActivityThread.java:128)
11-10 20:03:42.669: W/System.err(9654): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1161)
11-10 20:03:42.669: W/System.err(9654): at android.os.Handler.dispatchMessage(Handler.java:99)
11-10 20:03:42.669: W/System.err(9654): at android.os.Looper.loop(Looper.java:137)
11-10 20:03:42.669: W/System.err(9654): at android.app.ActivityThread.main(ActivityThread.java:4517)
11-10 20:03:42.669: W/System.err(9654): at java.lang.reflect.Method.invokeNative(Native Method) 
11-10 20:03:42.669: W/System.err(9654): at java.lang.reflect.Method.invoke(Method.java:511)
11-10 20:03:42.669: W/System.err(9654): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:993)
11-10 20:03:42.669: W/System.err(9654): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:760)
11-10 20:03:42.669: W/System.err(9654): at dalvik.system.NativeStart.main(Native Method)
11-10 20:03:42.669: W/System.err(9654): Caused by: java.lang.NoClassDefFoundError: com/google/android/gms/maps/SupportMapFragment
11-10 20:03:42.679: W/System.err(9654): ... 19 more
11-10 20:03:42.679: W/System.err(9654): Caused by: java.lang.ClassNotFoundException: com.google.android.gms.maps.SupportMapFragment
11-10 20:03:42.679: W/System.err(9654): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
11-10 20:03:42.679: W/System.err(9654): at java.lang.ClassLoader.loadClass(ClassLoader.java:501) 
11-10 20:03:42.679: W/System.err(9654): at java.lang.ClassLoader.loadClass(ClassLoader.java:461) 
11-10 20:03:42.679: W/System.err(9654): ... 19 more****** 
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Answer 1

在<application>清單文件中添加以下權限

<uses-library android:name="com.google.android.maps"/>

如果您在添加地圖組件時仍然遇到問題，請直接參考該教程以直接使用Map API v2，因為它非常簡單。