SignalMaps.java

package edu.nctu.wirelab.testsignalv1;

import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.util.Log;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class SignalMaps extends FragmentActivity implements OnMapReadyCallback {
    private final String TagName = new String("SignalMaps");
    private GoogleMap mMap;
    private MarkerOptions UserMark;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_signal_maps);
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);

    }


    /**
     * Manipulates the map once available.
     * This callback is triggered when the map is ready to be used.
     * This is where we can add markers or lines, add listeners or move the camera. In this case,
     * we just add a marker near Sydney, Australia.
     * If Google Play services is not installed on the device, the user will be prompted to install
     * it inside the SupportMapFragment. This method will only be triggered once the user has
     * installed Google Play services and returned to the app.
     */
    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;

        // 建立位置的座標物件
        if( LocationUpdater.userlocation!=null ) {
            Log.d(TagName, "Lat:" + LocationUpdater.userlocation.getLatitude() + "  Lnt:" + LocationUpdater.userlocation.getLongitude());
            LatLng place = new LatLng(LocationUpdater.userlocation.getLatitude(), LocationUpdater.userlocation.getLongitude());
            // 移動地圖
            moveMap(place);
            UserMark = null;
            UserMark = new MarkerOptions().position(place).title("I'm here");
            mMap.addMarker(UserMark);
        }
    }

    // 移動地圖到參數指定的位置
    private void moveMap(LatLng place) {
        // 建立地圖攝影機的位置物件
        CameraPosition cameraPosition =
                new CameraPosition.Builder()
                        .target(place)
                        .zoom(17)
                        .build();

        // 使用動畫的效果移動地圖
        mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
    }
}