java - 无法解析方法 getlatitude()

Question

我是编程新手，正在学习 Google Location API 教程。我已正确执行所有步骤，但是，以下代码在 getlatitude() 和 getlongitude() 处给我错误。错误:无法解析方法 getlatitude()。如果有人能指出这个问题，那就太好了。还有一件事要注意，代码似乎从不使用 android.location.Location 类，我希望 getlatitude() 会来自那里。

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks;
import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
import com.google.android.gms.location.LocationServices;
import android.location.Location;


public class MainActivity extends Activity implements ConnectionCallbacks, OnConnectionFailedListener {
    protected GoogleApiClient mGoogleApiClient;

    /**
     * Represents a geographical location.
     */
    protected String mLastLocation;
    protected static final String TAG = "basic-location-sample";
    protected TextView mLatitudeText;
    protected TextView mLongitudeText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
        mLatitudeText = (TextView) findViewById((R.id.latitude_text));
        mLongitudeText = (TextView) findViewById((R.id.longitude_text));
        buildGoogleApiClient();
   }

    protected synchronized void buildGoogleApiClient() {

        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener((OnConnectionFailedListener) this)
                .addApi(LocationServices.API)
                .build();
    }
    @Override
    protected void onStart() {
        super.onStart();
        mGoogleApiClient.connect();
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (mGoogleApiClient.isConnected()) {
            mGoogleApiClient.disconnect();
        }
    }

    @Override
    public void onConnected(Bundle connectionHint) {

        mLastLocation = String.valueOf(LocationServices.FusedLocationApi.getLastLocation(
                mGoogleApiClient));
       if (mLastLocation!= null) {
            mLatitudeText.setText(String.valueOf(mLastLocation.getLatitude()));
            mLongitudeText.setText(String.valueOf(mLastLocation.getLongitude()));
       }
 }

    @Override
    public void onConnectionSuspended(int i) {
        Log.i(TAG, "Connection suspended");
        mGoogleApiClient.connect();
    }

    @Override
    public void onConnectionFailed(ConnectionResult result) {
        Log.i(TAG, "Connection failed: ConnectionResult.getErrorCode() = " + result.getErrorCode());
    }


}

Answer 1

查看mLastLocation的类型:

protected String mLastLocation;

String 没有 getLatitude 和 getLongitude 方法。您的变量应该是 Location 类型，并且在没有 String.valueOf 调用的情况下进行初始化:

protected Location mLastLocation;
...
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);