Java 沮丧的getLastLocation.getLatitude（）将设置文本，但不会赢得'；Don’不要发起双人比赛。使用GoogleAPI进行此操作_Java_Android_Api_Google Maps_Location

Java 沮丧的getLastLocation.getLatitude（）将设置文本，但不会赢得'；Don’不要发起双人比赛。使用GoogleAPI进行此操作

java android api google-maps

Java 沮丧的getLastLocation.getLatitude（）将设置文本，但不会赢得'；Don’不要发起双人比赛。使用GoogleAPI进行此操作,java,android,api,google-maps,location,Java,Android,Api,Google Maps,Location,所以我整天都在做这件事，我快要失去理智了。为了从另一个api（forcast.io）获取天气信息，我正在尝试从google的location api获取坐标。我的代码已经达到了这样的程度：谷歌api正在用正确的坐标完美地设置我的文本视图。。。但是，当我尝试将这些坐标分配给将作为http链接发送到forcast.io的值时。。。lat和long的值为0.0。我不知道交易是什么。在OnConnection（）方法中初始化文本后，我尝试将文本作为字符串从TextView中获取，我尝试在OnConnec

所以我整天都在做这件事，我快要失去理智了。为了从另一个api（forcast.io）获取天气信息，我正在尝试从google的location api获取坐标。我的代码已经达到了这样的程度：谷歌api正在用正确的坐标完美地设置我的文本视图。。。但是，当我尝试将这些坐标分配给将作为http链接发送到forcast.io的值时。。。lat和long的值为0.0。我不知道交易是什么。在OnConnection（）方法中初始化文本后，我尝试将文本作为字符串从TextView中获取，我尝试在OnConnection（）方法中将值初始化为双倍值。。。我已经做了我能想到的一切。这是我的密码：

package com.gardnerwebideas.myweather;

import android.content.Context;
import android.location.Location;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationServices;
import com.squareup.okhttp.Call;
import com.squareup.okhttp.Callback;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;

import java.io.IOException;

public class MainActivity extends AppCompatActivity
        implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {


    private static final String TAG = MainActivity.class.getSimpleName();
    private GoogleApiClient mGoogleApiClient;
    private Location mLastLocation;
    private double mLatitude;
    private double mLongitude;
    private TextView mLatitudeText;
    private TextView mLongitudeText;




//----------------------GOOGLE API BUILD----------------------------
    protected synchronized void buildGoogleApiClient() {
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();

    }




//--------------------ON CREATE METHOD--------------------------------
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mLatitudeText = (TextView) findViewById(R.id.latitudeText);
        mLongitudeText = (TextView) findViewById(R.id.longitudeText);

        buildGoogleApiClient();
        mGoogleApiClient.connect();




//---------------------CODE FROM ANDROID PROJECT-----------------------
//----------------SETTING UP NETWORK AND WEATHER API-------------------
        String APIKey = "71e3dbfb4ebeb4dc3bcfb07097bb3645";
        String forecastUrl = "https://api.forecast.io/forecast/"
                + APIKey + "/"
                + mLatitude
                + ","
                + mLongitude;
        if (isNetworkAvailable()) {
            OkHttpClient client = new OkHttpClient();
            Request request = new Request.Builder()
                    .url(forecastUrl)
                    .build();

            Call call = client.newCall(request);
            call.enqueue(new Callback() {
                @Override
                public void onFailure(Request request, IOException e) {

                }

                @Override
                public void onResponse(Response response) throws IOException {
                    try {
                        if (response.isSuccessful()) {
                            Log.v(TAG, response.body().string());
                        } else {
                            alertUserAboutError();
                        }
                    } catch (IOException e) {
                        Log.e(TAG, "Exception caught: ", e);
                    }
                }
            });
        } else {
            Toast.makeText(this, "Network Unavailable", Toast.LENGTH_LONG).show();
        }
        Log.d(TAG, "Main UI code is running!");
    }




//------------------------NETWORK METHODS-------------------------------
    private boolean isNetworkAvailable() {
        ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = manager.getActiveNetworkInfo();
        boolean isAvailable = false;
        if (networkInfo != null && networkInfo.isConnected()) {
           isAvailable = true;
        }
        return isAvailable;
    }

    private void alertUserAboutError() {
        AlertDialogFragment dialog = new AlertDialogFragment();
        dialog.show(getFragmentManager(), "error_dialogue");
    }




//------------------------GOOGLE API CODE-------------------------------
    @Override
    public void onConnected(Bundle bundle) {
        mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
        if (mLastLocation != null) {
            mLatitudeText.setText(String.valueOf(mLastLocation.getLatitude()));
            mLongitudeText.setText(String.valueOf(mLastLocation.getLongitude()));
            mLatitude = mLastLocation.getLatitude();
            mLongitude = mLastLocation.getLongitude();
        }
    }

    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {

    }
}

你的两个变量

private double mLatitude;
private double mLongitude;

从不给定任何值，因此它们采用默认值

这样行吗

String lat = (((TextView) findViewById(R.id.latitudeText)).getText().toString());
mLatitude = Double.parseDouble(lat);

您缺少一个关键点：地理位置信息是以异步方式处理的。在您的代码中，这意味着您的地理位置信息将在调用forecast.io后可用，这就是为什么您总是看到0值的原因
只需按以下方式更新代码（查看方法
callForecastAPI
）：

何时调用OnConnected？你什么时候发送请求？我可以先告诉你你要。。。然后调用onConnected…我应该什么时候使用.connect（）方法？我想将变量值设置为onConnected（）方法中返回的值。很明显，在获得位置后应该调用weather api吗？我想我正在这么做。我在任何天气api之前调用.connect（）（并在onConnected（）中设置要在天气api中使用的变量）。Selvin的意思是，您在Google api客户端（调用onConnected）之前对forcast.io进行网络调用，因为网络调用是在onCreate中进行的。尝试在onConnected中移动网络代码（在说mLastLocation！=null的if语句中，作为一个测试，以查看它是否有效。我指的是标有//--------------的代码来自ANDROID项目--------------------//-----------设置网络和天气API-----------------我遵循ANDROID开发站点上的文档…他们给了我代码to在onConnected（）方法中分配TextView。我想我应该在那里分配变量的值。现在，我看到在onConnected（）中设置的值方法不要继续应用程序的其他部分。那么我该如何分配坐标值？@Wilson抱歉，我不是安卓专家。等待答案。如果你没有得到答案，我会悬赏你的问题，以证明我的诚实。没问题！我感谢你的热心帮助！我尝试了你的建议，但不幸的是仍然没有想要友好！
import android.content.Context; import android.location.Location; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.widget.TextView; import android.widget.Toast; import com.example.ziby.testing.R; import com.google.android.gms.common.ConnectionResult; import com.google.android.gms.common.api.GoogleApiClient; import com.google.android.gms.location.LocationServices; import com.squareup.okhttp.Call; import com.squareup.okhttp.Callback; import com.squareup.okhttp.OkHttpClient; import com.squareup.okhttp.Request; import com.squareup.okhttp.Response; import java.io.IOException; public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener { private static final String TAG = MainActivity.class.getSimpleName(); private GoogleApiClient mGoogleApiClient; private Location mLastLocation; private double mLatitude; private double mLongitude; private TextView mLatitudeText; private TextView mLongitudeText; //----------------------GOOGLE API BUILD---------------------------- protected synchronized void buildGoogleApiClient() { mGoogleApiClient = new GoogleApiClient.Builder(this) .addConnectionCallbacks(this) .addOnConnectionFailedListener(this) .addApi(LocationServices.API) .build(); } //--------------------ON CREATE METHOD-------------------------------- @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mLatitudeText = (TextView) findViewById(R.id.latitudeText); mLongitudeText = (TextView) findViewById(R.id.longitudeText); buildGoogleApiClient(); mGoogleApiClient.connect(); Log.d(TAG, "Main UI code is running!"); } private void callForecastAPI(){ String APIKey = "71e3dbfb4ebeb4dc3bcfb07097bb3645"; String forecastUrl = "https://api.forecast.io/forecast/" + APIKey + "/" + mLatitude + "," + mLongitude; if (isNetworkAvailable()) { OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder() .url(forecastUrl) .build(); Call call = client.newCall(request); call.enqueue(new Callback() { @Override public void onFailure(Request request, IOException e) { } @Override public void onResponse(Response response) throws IOException { try { if (response.isSuccessful()) { Log.v(TAG, response.body().string()); } else { alertUserAboutError(); } } catch (IOException e) { Log.e(TAG, "Exception caught: ", e); } } }); } else { Toast.makeText(this, "Network Unavailable", Toast.LENGTH_LONG).show(); } } //------------------------NETWORK METHODS------------------------------- private boolean isNetworkAvailable() { ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo networkInfo = manager.getActiveNetworkInfo(); boolean isAvailable = false; if (networkInfo != null && networkInfo.isConnected()) { isAvailable = true; } return isAvailable; } private void alertUserAboutError() { AlertDialogFragment dialog = new AlertDialogFragment(); dialog.show(getFragmentManager(), "error_dialogue"); } //------------------------GOOGLE API CODE------------------------------- @Override public void onConnected(Bundle bundle) { mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient); if (mLastLocation != null) { mLatitudeText.setText(String.valueOf(mLastLocation.getLatitude())); mLongitudeText.setText(String.valueOf(mLastLocation.getLongitude())); mLatitude = mLastLocation.getLatitude(); mLongitude = mLastLocation.getLongitude(); callForecastAPI(); //call the forecast API when you get the location } } @Override public void onConnectionSuspended(int i) { } @Override public void onConnectionFailed(ConnectionResult connectionResult) { } }