Java 无法重新选择方法android studio断开和（R.id.map）

我对用Java开发应用程序还是个新手。一切都进行得很顺利，直到我遇到了一个问题。受保护的void on Stop和R.id.map.getMap下的断开连接，因为它出现了一个错误，称为无法解析断开连接的方法，并且无法重新选择映射的符号。 如果有人想看一看的话，我现在正在学习一个精彩的教程：谢谢大家

package com.google.android.gms.location.sample.geofencing;

import java.util.ArrayList;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.location.Geofence;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnCameraChangeListener;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.CircleOptions;
import com.google.android.gms.maps.model.LatLng;

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

public class MainActivity extends FragmentActivity implements OnCameraChangeListener {

    /**
     * Google Map object
     */
    private GoogleMap mMap;

    /**
     * Geofence Data
     */

    /**
     * Geofences Array
     */
    ArrayList<Geofence> mGeofences;

    /**
     * Geofence Coordinates
     */
    ArrayList<LatLng> mGeofenceCoordinates;

    /**
     * Geofence Radius'
     */
    ArrayList<Integer> mGeofenceRadius;

    /**
     * Geofence Store
     */
    private GeofenceStore mGeofenceStore;


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

        // Initializing variables
        mGeofences = new ArrayList<Geofence>();
        mGeofenceCoordinates = new ArrayList<LatLng>();
        mGeofenceRadius = new ArrayList<Integer>();

        // Adding geofence coordinates to array.
        mGeofenceCoordinates.add(new LatLng(43.042861, -87.911559));
        mGeofenceCoordinates.add(new LatLng(43.042998, -87.909753));
        mGeofenceCoordinates.add(new LatLng(43.040732, -87.921364));
        mGeofenceCoordinates.add(new LatLng(43.039912, -87.897038));

        // Adding associated geofence radius' to array.
        mGeofenceRadius.add(100);
        mGeofenceRadius.add(50);
        mGeofenceRadius.add(160);
        mGeofenceRadius.add(160);


        // Bulding the geofences and adding them to the geofence array.

        // Performing Arts Center
        mGeofences.add(new Geofence.Builder()
                .setRequestId("Performing Arts Center")
                        // The coordinates of the center of the geofence and the radius in meters.
                .setCircularRegion(mGeofenceCoordinates.get(0).latitude, mGeofenceCoordinates.get(0).longitude, mGeofenceRadius.get(0).intValue())
                .setExpirationDuration(Geofence.NEVER_EXPIRE)
                        // Required when we use the transition type of GEOFENCE_TRANSITION_DWELL
                .setLoiteringDelay(30000)
                .setTransitionTypes(
                        Geofence.GEOFENCE_TRANSITION_ENTER
                                | Geofence.GEOFENCE_TRANSITION_DWELL
                                | Geofence.GEOFENCE_TRANSITION_EXIT).build());

        // Starbucks
        mGeofences.add(new Geofence.Builder()
                .setRequestId("Starbucks")
                        // The coordinates of the center of the geofence and the radius in meters.
                .setCircularRegion(mGeofenceCoordinates.get(1).latitude, mGeofenceCoordinates.get(1).longitude, mGeofenceRadius.get(1).intValue())
                .setExpirationDuration(Geofence.NEVER_EXPIRE)
                        // Required when we use the transition type of GEOFENCE_TRANSITION_DWELL
                .setLoiteringDelay(30000)
                .setTransitionTypes(
                        Geofence.GEOFENCE_TRANSITION_ENTER
                                | Geofence.GEOFENCE_TRANSITION_DWELL
                                | Geofence.GEOFENCE_TRANSITION_EXIT).build());

        // Milwaukee Public Museum
        mGeofences.add(new Geofence.Builder()
                .setRequestId("Milwaukee Public Museum")
                        // The coordinates of the center of the geofence and the radius in meters.
                .setCircularRegion(mGeofenceCoordinates.get(2).latitude, mGeofenceCoordinates.get(2).longitude, mGeofenceRadius.get(2).intValue())
                .setExpirationDuration(Geofence.NEVER_EXPIRE)
                .setTransitionTypes(
                        Geofence.GEOFENCE_TRANSITION_ENTER
                                | Geofence.GEOFENCE_TRANSITION_EXIT).build());

        // Milwaukee Art Museum
        mGeofences.add(new Geofence.Builder()
                .setRequestId("Milwaukee Art Museum")
                        // The coordinates of the center of the geofence and the radius in meters.
                .setCircularRegion(mGeofenceCoordinates.get(3).latitude, mGeofenceCoordinates.get(3).longitude, mGeofenceRadius.get(3).intValue())
                .setExpirationDuration(Geofence.NEVER_EXPIRE)
                .setTransitionTypes(
                        Geofence.GEOFENCE_TRANSITION_ENTER
                                | Geofence.GEOFENCE_TRANSITION_EXIT).build());

        // Add the geofences to the GeofenceStore object.
        mGeofenceStore = new GeofenceStore(this, mGeofences);

    }

    @Override
    protected void onStart() {
        super.onStart();
    }

    @Override
    protected void onStop() {
        mGeofenceStore.disconnect();
        super.onStop();
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (GooglePlayServicesUtil.isGooglePlayServicesAvailable(this) == ConnectionResult.SUCCESS) {
            setUpMapIfNeeded();
        } else {
            GooglePlayServicesUtil.getErrorDialog(
                    GooglePlayServicesUtil.isGooglePlayServicesAvailable(this),
                    this, 0);
        }
    }

    private void setUpMapIfNeeded() {
        // Do a null check to confirm that we have not already instantiated the
        // map.
        if (mMap == null) {
            // Try to obtain the map from the SupportMapFragment.
            mMap = ((SupportMapFragment) getSupportFragmentManager()
                    .findFragmentById(R.id.map)).getMap();

            // Check if we were successful in obtaining the map.
            if (mMap != null) {
                setUpMap();
            }
        }
    }

    /**
     * This is where we can add markers or lines, add listeners or move the
     * camera. In this case, we just add a marker near Africa.
     * <p/>
     * This should only be called once and when we are sure that {@link #mMap}
     * is not null.
     */
    private void setUpMap() {
        // Centers the camera over the building and zooms int far enough to
        // show the floor picker.
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(
                43.039634, -87.908395), 14));

        // Hide labels.
        mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
        mMap.setIndoorEnabled(false);
        mMap.setMyLocationEnabled(true);

        mMap.setOnCameraChangeListener(this);

    }

    @Override
    public void onCameraChange(CameraPosition position) {
        // Makes sure the visuals remain when zoom changes.
        for(int i = 0; i < mGeofenceCoordinates.size(); i++) {
            mMap.addCircle(new CircleOptions().center(mGeofenceCoordinates.get(i))
                    .radius(mGeofenceRadius.get(i).intValue())
                    .fillColor(0x40ff0000)
                    .strokeColor(Color.TRANSPARENT).strokeWidth(2));
        }
    }
}

转到文件->使缓存无效/重新启动。这就解决了95%的问题， 在另外5%的情况下，尝试将源文件放在更靠近根文件夹的位置，在许多情况下，它是C:/。只需复制粘贴项目文件夹并将其粘贴到C中即可

本教程中未实现断开连接。