Java 更新后如何获取位置？

我遵循一个教程，使用谷歌地图API获取最后一个已知位置，或者在没有位置的情况下请求位置更新

这是我的onConnected方法

@Override
public void onConnected(Bundle bundle) {
    Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
    if (location == null) {
        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
        Log.v(TAG, "old location" + location);

    }
    else {
        handleNewLocation(location);
        Log.v(TAG, "new location");
    }
}

因此，第一个条件应该请求一个新位置。这个位置存储在哪里？我想它可能会执行handeNewLocation（代码如下）

我需要获取位置并将其存储为字符串，所以我的问题是我不知道确切的位置

LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);

正在保存新位置

这是舱单：

<?xml version="1.0" encoding="utf-8"?>

你需要打电话

LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
    Log.v(TAG, "old location" + location);

在你打电话之前

Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);

---

然后，该位置将存储在

location

中。请求位置更新的调用就是这样做的，它请求位置更新

在您拨打该电话后，新的位置将进入

onLocationChanged（）

如果希望始终保存当前位置，可以使用成员变量进行保存

请注意，不需要像现在这样记录空位置，因此在位置为空的情况下删除日志项：

    Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
    if (location == null) {
        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
    }
    else {
        handleNewLocation(location);
        Log.v(TAG, "new location");
    }

然后更新

handleNewLocation（）中的成员变量
：

然后，在
onLocationChanged（）
回调中调用
handleNewLocation（）
：

@Override
public void onLocationChanged(Location location) {

    //location changed, update current location
    handleNewLocation(location);
    Log.v(TAG, "new location");

}

全班：

public class LocationActivity extends Activity implements
        GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {

    LocationRequest mLocationRequest;
    GoogleApiClient mGoogleApiClient;
    double currentLatitude; //added as member variable
    double currentLongitude; //added as member variable
    String TAG = "myapp";
    String loc;

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

        buildGoogleApiClient();
        mGoogleApiClient.connect();
    }

    @Override
    protected void onPause(){
        super.onPause();
        if (mGoogleApiClient != null) {
            LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
        }
    }

    protected synchronized void buildGoogleApiClient() {
        Toast.makeText(this,"buildGoogleApiClient",Toast.LENGTH_SHORT).show();
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
    }

    @Override
    public void onConnected(Bundle bundle) {

        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(10);
        mLocationRequest.setFastestInterval(10);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
        //mLocationRequest.setSmallestDisplacement(0.1F);

        Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
        if (location == null) {
            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
        }
        else {
            handleNewLocation(location);
            Log.v(TAG, "new location");
        }

    }

    private void handleNewLocation(Location location) {
        Log.d(TAG, location.toString());
        currentLatitude = location.getLatitude(); //update member variable
        currentLongitude = location.getLongitude(); //update member variable
        loc = "Latitude: " + Double.toString(currentLatitude) + ", Longitude: " + Double.toString(currentLongitude);
        Log.v(TAG, loc);
    }

    @Override
    public void onConnectionSuspended(int i) {
        Toast.makeText(this,"onConnectionSuspended",Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        Toast.makeText(this,"onConnectionFailed",Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onLocationChanged(Location location) {

        //location changed, update current location
        handleNewLocation(location);
        Log.v(TAG, "new location");

    }
}

然后我的条件就不起作用了，因为我正在测试location是否为null，并且我确实需要请求位置更新，或者我是否可以只使用location。你认为if语句是不必要的吗？是的，我已经做了这件事。我正在做这件事，位置是空的。不确定我做错了什么？确定我做错了。编辑：我刚刚添加了它（你没有错过任何东西）。
private void handleNewLocation(Location location) {
    Log.d(TAG, location.toString());
    currentLatitude = location.getLatitude(); //update member variable
    currentLongitude = location.getLongitude(); //update member variable
    loc = "Latitude: " + Double.toString(currentLatitude) + ", Longitude: " + Double.toString(currentLongitude);
    Log.v(TAG, loc);
}

@Override
public void onLocationChanged(Location location) {

    //location changed, update current location
    handleNewLocation(location);
    Log.v(TAG, "new location");

}

public class LocationActivity extends Activity implements
        GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {

    LocationRequest mLocationRequest;
    GoogleApiClient mGoogleApiClient;
    double currentLatitude; //added as member variable
    double currentLongitude; //added as member variable
    String TAG = "myapp";
    String loc;

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

        buildGoogleApiClient();
        mGoogleApiClient.connect();
    }

    @Override
    protected void onPause(){
        super.onPause();
        if (mGoogleApiClient != null) {
            LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
        }
    }

    protected synchronized void buildGoogleApiClient() {
        Toast.makeText(this,"buildGoogleApiClient",Toast.LENGTH_SHORT).show();
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
    }

    @Override
    public void onConnected(Bundle bundle) {

        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(10);
        mLocationRequest.setFastestInterval(10);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
        //mLocationRequest.setSmallestDisplacement(0.1F);

        Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
        if (location == null) {
            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
        }
        else {
            handleNewLocation(location);
            Log.v(TAG, "new location");
        }

    }

    private void handleNewLocation(Location location) {
        Log.d(TAG, location.toString());
        currentLatitude = location.getLatitude(); //update member variable
        currentLongitude = location.getLongitude(); //update member variable
        loc = "Latitude: " + Double.toString(currentLatitude) + ", Longitude: " + Double.toString(currentLongitude);
        Log.v(TAG, loc);
    }

    @Override
    public void onConnectionSuspended(int i) {
        Toast.makeText(this,"onConnectionSuspended",Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        Toast.makeText(this,"onConnectionFailed",Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onLocationChanged(Location location) {

        //location changed, update current location
        handleNewLocation(location);
        Log.v(TAG, "new location");

    }
}