android开发_Location位置定位

新建项目：

New Android Project->
Project name:Location
Build Target:Android 2.2
Application name: AppWidget
Package name:com.b510
Create Activity:MainActivity
Min SDK Version:9
Finish

项目结构：

运行效果：

代码部分：

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.b510"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="9" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".MainActivity"
                  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>
    <!-- from android api:Allows an application to access fine (e.g., GPS) location  -->
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> 
</manifest>

main.xml

<?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"
    >
        <!-- 表示经度 -->
    <TextView  
        android:id="@+id/longitutde"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        />
          <!-- 表示纬度 -->
    <TextView  
        android:id="@+id/latitude"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        />
</LinearLayout>

MainActivity.java

package com.b510;

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 MainActivity extends Activity {
    /** 显示经度 */
    private TextView longitude;
    /** 显示维度 */
    private TextView latitude;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        //从xml中找到已经定义好的TextView：longitude，latitude
        longitude = (TextView) findViewById(R.id.longitutde);
        latitude = (TextView) findViewById(R.id.latitude);
        //初始化一个location
        Location location = getLocation(this);
        //设置TextView控件的显示信息：经度和维度
        longitude.setText("经度：" + location.getLongitude());
        latitude.setText("维度：" + location.getLatitude());
    }
    @SuppressWarnings("static-access")
    private Location getLocation(Context context) {
        //You do not instantiate this class directly;
        //instead, retrieve it through: 
        //Context.getSystemService(Context.LOCATION_SERVICE).
        LocationManager locationManager = (LocationManager) context
                .getSystemService(context.LOCATION_SERVICE);
        //获取GPS支持
        Location location = locationManager
                .getLastKnownLocation(locationManager.GPS_PROVIDER);
        if (location == null) {
            //获取NETWORK支持
            location = locationManager
                    .getLastKnownLocation(locationManager.NETWORK_PROVIDER);
        }
        return location;
    }
}