作者:邹杰
Location 在Android 开发中还是经常用到的,如通过经纬度获取天气,根据Location 获取所在地区详细Address (比如Google
Map 开发)等。而在Android 中通过LocationManager来获取Location .通常获取Location 有GPS 获取,WIFI 获取。
这边介绍一个简单的小Demo ,来教大家如何获取Location ,从而获取经纬度。
第一步:创建一个Android 工程命名为LocationDemo .
第二步:修改main.xml 代码如下:
第二步:修改main.xml 代码如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:id="@+id/longitude"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="longitude:"
/>
<TextView
android:id="@+id/latitude"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="latitude:"
/>
</LinearLayout>
第三步:修改LocationDemo.java ,代码如下:
package pku.ss;
import pku.ss.R;
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;
public class LocationDemoActivity extends Activity {
private TextView longitude;
private TextView latitude;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
longitude = (TextView)findViewById(R.id.longitude);
latitude = (TextView)findViewById(R.id.latitude);
Location mLocation = getLocation(this);
longitude.setText("Longitude: " + mLocation.getLongitude());
latitude.setText("Latitude: " + mLocation.getLatitude());
}
//Get the Location by GPS or WIFI
public Location getLocation(Context context) {
LocationManager locMan = (LocationManager) context
.getSystemService(Context.LOCATION_SERVICE);
Location location = locMan
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location == null) {
location = locMan
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
}
return location;
}
}
第四步:增加权限,修改AndroidManifest.xml 代码如下(第16行为所增行):
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="pku.ss"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".LocationDemo"
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>
<uses-sdk android:minSdkVersion="7" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
</manifest>
第五步:运行LocationDemo 工程,所得效果如下: