Question

好的我没有遇到与网络协调的问题，但我的教授要求我们将获取代码部分的位置放入其自己的类（比如NetworkLocation.java）。现在事情变得有趣了。

我的代码是：

//MainActivity.java
package com.example.maest.weather;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;


public class MainActivity extends AppCompatActivity {
    private TextView t;
    private LocationManager mLocationManager;

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

        t = (TextView) findViewById(R.id.textView);

        mLocationManager = (LocationManager) getSystemService(LOCATION_SERVICE);

        NetworkLocation mNetworkLocation = new NetworkLocation();
        double mCoordinate[] = mNetworkLocation.getNetworkLocation(mLocationManager);

        t.append("\n Longtitude: " + mCoordinate[0] + "\n Latitude: " + mCoordinate[1] + "\n");

    }
}

和NetworkLocation.java

//NetworkLocation.java
package com.example.maest.weather;

import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;

public class NetworkLocation {
private LocationListener mLocationListener;
private double mCoordinate[] = {0, 0};

public double[] getNetworkLocation (LocationManager mLocationManager) {

    mLocationListener = new LocationListener() {
        @Override
        public void onLocationChanged(Location mLocation) {
            mCoordinate[0] = mLocation.getLongitude();
            mCoordinate[1] = mLocation.getLatitude();
        }

        @Override
        public void onStatusChanged(String s, int i, Bundle bundle) {

        }

        @Override
        public void onProviderEnabled(String s) {

        }

        @Override
        public void onProviderDisabled(String s) {

        }
    };

    try{
        mLocationManager.requestLocationUpdates(mLocationManager.NETWORK_PROVIDER, 5000, 0, mLocationListener);  
        mLocation[0] = 5; //see if it works.
    }catch(SecurityException e){
        // Need update here.
    };

    return mCoordinate;
}
}

结果，界面中显示的经度始终为5，纬度始终为0.含义，代码：mLocationManager.requestLocationUpdates（mLocationManager.NETWORK_PROVIDER，5000,0，mLocationListener）;但是，onLocationChanged（）永远不会被调用。

嗯......这里没有语法错误，也没有运行时错误。那我该怎么办？

Android - 使用网络

0 个答案: