1

我正在尝试查找当前位置，这是我的代码。

 LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);        
        Location location =new Location(mlocManager.GPS_PROVIDER);      

 System.out.println("***longitude **"+location.getLongitude());
        System.out.println("***latitude **"+location.getLatitude());

但是当我运行应用程序时，它总是显示 0.0 任何人都可以看到问题吗？

4

5 回答 5

1

位置是异步获取的。您需要向您的 注册一个LocationListener，只要有新的位置信息可用LocationManager，onLocationChanged(Location l)就会调用它。

于 2012-06-25T05:34:02.970 回答
1 
Location location =new Location(mlocManager.GPS_PROVIDER);

写完此语句后，如果您将光标放在位置上，您将了解此语句的确切含义。

根据谷歌文档

以上构造一个新的位置。默认情况下，时间、纬度、经度和 numSatellites 为 0；hasAltitude、hasSpeed 和 hasBearing 为 false；并且没有额外的信息。

您需要开火requestLocationUpdate才能获得经纬度（如果有）。

此外，由于您在模拟器上运行此示例。您将需要手动模拟发送纬度和经度。

在此处输入图像描述

于 2012-06-25T06:02:46.750 回答
0

确保您在真实设备而不是模拟器中运行应用程序。您的设备也应该启用数据。

Menifest还要在文件中给出 uses:permission 。FINE_LOCATION

于 2012-06-25T05:30:02.147 回答
0

我想你的意思是这样

Location location = mlocManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

但请注意，这只有在您的 gps 已经抓取了以前的位置时才有效。因此，在模拟器上，您需要在调用这条线路之前发送一个位置，而在真实设备上，gps 必须在线路之前激活并接收到一个位置。

于 2012-06-25T05:58:33.257 回答
0

试试这个...

package com.ShowLocationActivity;
 import java.util.List;
 import java.util.Locale;
 import android.app.Activity;
 import android.content.Context;
 import android.location.Address;
 import android.location.Criteria;
 import android.location.Geocoder;
 import android.location.Location;
 import android.location.LocationListener;
 import android.location.LocationManager;
 import android.os.Bundle;
 import android.widget.TextView;
 import android.widget.Toast;


  public class ShowLocationActivity extends Activity implements LocationListener{
private TextView latituteField;
private TextView longitudeField;
private TextView placeName;
private LocationManager locationManager;
private String provider;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    latituteField = (TextView) findViewById(R.id.TextView02);
    longitudeField = (TextView) findViewById(R.id.TextView04);
    placeName=(TextView) findViewById(R.id.TextView06); 
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    Criteria criteria = new Criteria();
    provider = locationManager.getBestProvider(criteria, false);
    Location location = locationManager.getLastKnownLocation(provider);

    if (location != null) {
    //  Toast.makeText(this, String.valueOf("Provider " + provider + " has been selected."), 600).show();
        latituteField.setText(String.valueOf(location.getLatitude()));
        longitudeField.setText(String.valueOf(location.getLongitude()));
    } else {
        latituteField.setText("Provider not available");
        longitudeField.setText("Provider not available");
    }

    try {
        Geocoder geo = new Geocoder(this.getApplicationContext(), Locale.getDefault());
        List<Address> addresses = geo.getFromLocation(location.getLatitude(), location.getLongitude(), 1);
        if (addresses.isEmpty()) {
            placeName.setText("Waiting for Location");
        }
        else {
            if (addresses.size() > 0) {
                placeName.setText(addresses.get(0).getFeatureName() + ", " + addresses.get(0).getLocality() +", " + addresses.get(0).getAdminArea() + ", " + addresses.get(0).getCountryName());
            }
        }
    }
    catch(Exception e){
        Toast.makeText(this, "No Location Name Found", 600).show();
    }
}

@Override
protected void onResume() {
    super.onResume();
    locationManager.requestLocationUpdates(provider, 400, 1, this);
}
@Override
protected void onPause() {
    super.onPause();
    locationManager.removeUpdates(this);
}

@Override
public void onLocationChanged(Location location) {
    // TODO Auto-generated method stub
    latituteField.setText(String.valueOf(location.getLatitude()));
    longitudeField.setText(String.valueOf(location.getLongitude()));

    try {
        Geocoder geo = new Geocoder(this.getApplicationContext(), Locale.getDefault());
        List<Address> addresses = geo.getFromLocation(location.getLatitude(), location.getLongitude(), 1);
        if (addresses.isEmpty()) {
            placeName.setText("Waiting for Location");
        }
        else {
            if (addresses.size() > 0) {
                placeName.setText(addresses.get(0).getFeatureName() + ", " + addresses.get(0).getLocality() +", " + addresses.get(0).getAdminArea() + ", " + addresses.get(0).getCountryName());
            }
        }
    }
    catch(Exception e){
        Toast.makeText(this, "No Location Name Found", 600).show();
    }
}

@Override
public void onProviderDisabled(String provider) {
    // TODO Auto-generated method stub
    Toast.makeText(this, "Disabled provider " + provider,Toast.LENGTH_SHORT).show();
}

@Override
public void onProviderEnabled(String provider) {
    // TODO Auto-generated method stub
    Toast.makeText(this, "Enabled new provider " + provider,Toast.LENGTH_SHORT).show();
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
    // TODO Auto-generated method stub

}

}

这是 XML 文件

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<LinearLayout
    android:id="@+id/linearLayout1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="40dip"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/TextView01"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dip"
        android:layout_marginRight="5dip"
        android:text="Latitude: "
        android:textSize="20dip" >
    </TextView>

    <TextView
        android:id="@+id/TextView02"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="unknown"
        android:textSize="20dip" >
    </TextView>
</LinearLayout>

<LinearLayout
    android:id="@+id/linearLayout2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <TextView
        android:id="@+id/TextView03"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dip"
        android:layout_marginRight="5dip"
        android:text="Longitute: "
        android:textSize="20dip" >
    </TextView>

    <TextView
        android:id="@+id/TextView04"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="unknown"
        android:textSize="20dip" >
    </TextView>
</LinearLayout>

<LinearLayout
    android:id="@+id/linearLayout3"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <TextView
        android:id="@+id/TextView05"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dip"
        android:layout_marginRight="5dip"
        android:text="Place Name "
        android:textSize="20dip" >
    </TextView>

    <TextView
        android:id="@+id/TextView06"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="unknown"
        android:textSize="20dip" >
    </TextView>
</LinearLayout>

这是清单文件

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.ShowLocationActivity"
  android:versionCode="1"
  android:versionName="1.0">
  <uses-permission android:name="android.permission.INTERNET"></uses-permission>
  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>
  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission> 
   <application android:icon="@drawable/icon" android:label="@string/app_name">
    <activity android:name=".ShowLocationActivity"
              android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

</application>

对我有用..试试这个，它会为你工作 2.... :)

于 2012-06-25T05:58:48.807 回答