从其他方法访问变量

Question

我正在尝试使用当前位置在 android 中提交用户注册表单。我是 android 和 java 开发的新手。当我尝试在我的名称值对代码中访问 onLocationChanged 方法的 myLat 和 myLan 时，它无法找到这两个变量。如何访问我的名称值对代码中的两个变量。

package com.imran;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

import com.google.android.gcm.GCMRegistrar;
import com.google.android.maps.MyLocationOverlay;

import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.StrictMode;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.app.Activity;
import android.content.Context;

public class Register extends Activity {




    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);
        final EditText email_id = (EditText)  findViewById(R.id.email_id) ;
        final EditText name = (EditText) findViewById(R.id.name);
        final EditText password = (EditText) findViewById(R.id.password);
        Button button = (Button) findViewById(R.id.button1) ;



        //generate GCM id
        GCMRegistrar.checkDevice(this);
        GCMRegistrar.checkManifest(this);
        final String regId = GCMRegistrar.getRegistrationId(this);
        if (regId.equals("")) {
          GCMRegistrar.register(this, "12356");

        } else {
        String TAG = null;
        Log.v(TAG, regId);

        }
        //generate GCM id ended
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy); 
        //get current location

        LocationManager manager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        LocationListener listner = new LocationListener() {

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

            }

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

            }

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

            }

            @Override
            public void onLocationChanged(Location location) {
                double myLonDouble = location.getLongitude();
            final String myLon = Double.toString(myLonDouble);
                double myLatDouble = location.getLatitude();
                final String myLat = Double.toString(myLatDouble);

            }
        };
        manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, listner);



        //end get current location

        button.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View arg0) {
        // TODO Auto-generated method stub
        //postData();
          HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost("http://xyz.com/folder/register.php");

            try {
                // Add your data
                List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
                nameValuePairs.add(new BasicNameValuePair("email", email_id.getText().toString()));
                nameValuePairs.add(new BasicNameValuePair("name", name.getText().toString()));
                nameValuePairs.add(new BasicNameValuePair("password", password.getText().toString()));
                nameValuePairs.add(new BasicNameValuePair("regid", regId));
                nameValuePairs.add(new BasicNameValuePair("uid", "2"));
                nameValuePairs.add(new BasicNameValuePair("lat",myLat ));
                nameValuePairs.add(new BasicNameValuePair("lon",myLon));
               httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

                // Execute HTTP Post Request
               //Toast.makeText(this, resId, duration)
                HttpResponse response = httpclient.execute(httppost);

            } catch (ClientProtocolException e) {
                // TODO Auto-generated catch block
            } catch (IOException e) {
                // TODO Auto-generated catch block
            }

    }
});

    }


}

Answer 1

您可能应该学习scope 和member variables。问题是，你不能在一个方法中声明一件事，然后尝试从另一个方法访问它。

所以，我们将这个东西声明为成员变量，并在一个方法中定义它，然后它可以在另一个方法中使用。

像这样（我用**标记了我的cmets）：

public class Register extends Activity {

    // "private" means it can only be accessed from this class
    private String myLat = null; // ** Declare myLat
    private String myLon = null; // ** Declare myLon


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);
        final EditText email_id = (EditText)  findViewById(R.id.email_id) ;
        final EditText name = (EditText) findViewById(R.id.name);
        final EditText password = (EditText) findViewById(R.id.password);
        Button button = (Button) findViewById(R.id.button1) ;



        //generate GCM id
        GCMRegistrar.checkDevice(this);
        GCMRegistrar.checkManifest(this);
        final String regId = GCMRegistrar.getRegistrationId(this);
        if (regId.equals("")) {
          GCMRegistrar.register(this, "12356");

        } else {
        String TAG = null;
        Log.v(TAG, regId);

        }
        //generate GCM id ended
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy); 
        //get current location

        LocationManager manager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        LocationListener listner = new LocationListener() {

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

            }

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

            }

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

            }

            @Override
            public void onLocationChanged(Location location) {
                double myLonDouble = location.getLongitude();
                myLon = Double.toString(myLonDouble); // ** Define myLon
                double myLatDouble = location.getLatitude();
                myLat = Double.toString(myLatDouble); // ** Define myLat

            }
        };
        manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, listner);



        //end get current location

        button.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
        // TODO Auto-generated method stub
        // ** Check if they have been defined
        if (myLat == null || myLon == null)
            return;

        //postData();
          HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost("http://xyz.com/folder/register.php");

            try {
            // Add your data
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
            nameValuePairs.add(new BasicNameValuePair("email", email_id.getText().toString()));
            nameValuePairs.add(new BasicNameValuePair("name", name.getText().toString()));
            nameValuePairs.add(new BasicNameValuePair("password", password.getText().toString()));
            nameValuePairs.add(new BasicNameValuePair("regid", regId));
            nameValuePairs.add(new BasicNameValuePair("uid", "2"));
            nameValuePairs.add(new BasicNameValuePair("lat",myLat ));
            nameValuePairs.add(new BasicNameValuePair("lon",myLon));
               httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

            // Execute HTTP Post Request
               //Toast.makeText(this, resId, duration)
            HttpResponse response = httpclient.execute(httppost);

            } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            } catch (IOException e) {
            // TODO Auto-generated catch block
            }

        }
    });

    }


}

Answer 2

您的变量范围有问题。您正在初始化的 myLatDouble 和 myLon Double 仅存在于创建它们的 onLocationChanged 方法中。您必须在不同的地方声明它们，这样当您尝试访问它们时它们不会超出范围，或者您必须将它们作为参数传递到 nameValuePairs 代码中