在Android中使用Google Map API V2顯示我的足跡

Question

我正在嘗試制作一個可以顯示我當前位置並使用line從那里跟蹤我的應用程序。我一直在使用適用於Android的Google Maps Api v2，所以我試圖使用折線來幫助我顯示我的足跡，但是展示。 有人可以幫我嗎..謝謝。 提供了總代碼。

public class MainActivity extends FragmentActivity implements ConnectionCallbacks,
    OnConnectionFailedListener, LocationListener,
    OnMyLocationButtonClickListener, OnClickListener, android.location.LocationListener {

private GoogleMap mMap;

private LocationClient mLocationClient;
private TextView mMessageView;
private boolean setIt;


// These settings are the same as the settings for the map. They will in fact give you updates
// at the maximal rates currently possible.
private static final LocationRequest REQUEST = LocationRequest.create()
        .setInterval(5000)         // 5 seconds
        .setFastestInterval(16)    // 16ms = 60fps
        .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.my_location_demo);
    mMessageView = (TextView) findViewById(R.id.message_text);
    Button b1=(Button)findViewById(R.id.start);
    Button b2=(Button)findViewById(R.id.stop);
    b1.setOnClickListener(this);
    b2.setOnClickListener(this);
}


@Override
protected void onResume() {
    super.onResume();
    setUpMapIfNeeded();
    setUpLocationClientIfNeeded();
    mLocationClient.connect();

}

@Override
public void onPause() {
    super.onPause();
    if (mLocationClient != null) {
        mLocationClient.disconnect();
    }
}

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) {
            mMap.setMyLocationEnabled(true);
            mMap.setOnMyLocationButtonClickListener(this);
        }
    }
}

private void setUpLocationClientIfNeeded() {
    if (mLocationClient == null) {
        mLocationClient = new LocationClient(
                getApplicationContext(),
                this,  // ConnectionCallbacks
                this); // OnConnectionFailedListener
    }
}

/**
 * Button to get current Location. This demonstrates how to get the current Location as required
 * without needing to register a LocationListener.
 */
public void showMyLocation(View view) {
    if (mLocationClient != null && mLocationClient.isConnected()) {
        String msg = "Location = " + mLocationClient.getLastLocation();
        Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_SHORT).show();
    }
}


@Override
public void onClick(View v) {
    // TODO Auto-generated method stub
    LocationManager locationmanager = (LocationManager) getSystemService(LOCATION_SERVICE);


    locationmanager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);

        if (v.getId() == R.id.start) {
            setIt = true;
            };
        if (v.getId() == R.id.stop) {
            mMap.clear();
            };


}

 PolylineOptions rectOptions = new PolylineOptions().width(3).color(
        Color.RED);

@Override
public void onLocationChanged(Location location) {
    mMessageView.setText("Location = " + location);


    rectOptions.add(new LatLng(location.getLatitude(), location.getLongitude()));

     if (setIt == true){
          mMap.addPolyline(rectOptions);
     }
}



@Override
public void onConnected(Bundle connectionHint) {
    mLocationClient.requestLocationUpdates(
            REQUEST,
            this);  // LocationListener
}

/**
 * Callback called when disconnected from GCore. Implementation of {@link ConnectionCallbacks}.
 */
@Override
public void onDisconnected() {
    // Do nothing
}

/**
 * Implementation of {@link OnConnectionFailedListener}.
 */
@Override
public void onConnectionFailed(ConnectionResult result) {
    // Do nothing
}

@Override
public boolean onMyLocationButtonClick() {

    {
        setIt = true;
        };
    Toast.makeText(this, "MyLocation button clicked", Toast.LENGTH_SHORT).show();
    // Return false so that we don't consume the event and the default behavior still occurs
    // (the camera animates to the user's current position).
    return false;


}

@Override
public void onProviderDisabled(String arg0) {
    // TODO Auto-generated method stub

}

@Override
public void onProviderEnabled(String arg0) {
    // TODO Auto-generated method stub

}

@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
    // TODO Auto-generated method stub

}
}

Answer 1

在Google Map API V2中，這非常容易。 如果您想這樣做，可以點擊以下參考鏈接：

轉到此stackoverflow鏈接

這個人已經給出了有用的解決方案。 我做的方法與本網站所說的相同。

對於您的設施，我寫了一些主要內容：

1.創建LatLng點列表，例如：

List<LatLng> routePoints;

2.將路由點添加到列表中（可以/應該循環執行）：

routePoints.add(mapPoint);

3.創建一條折線，並向其輸入LatLng點列表：

Polyline route = map.addPolyline(new PolylineOptions()
  .width(_strokeWidth)
  .color(_pathColor)
  .geodesic(true)
  .zIndex(z));
route.setPoints(routePoints);

試試這個並給出反饋！！！