Android学习笔记(二十七)

原创于 2011-04-13 20:36:39 发布 · 83 阅读

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文章标签：

#Android #XML #Access #OS

本文介绍了一个简单的Android应用程序，用于获取用户的地理位置信息。通过使用LocationManager和LocationListener接口，该应用能够在用户点击按钮后实时更新并显示用户的经纬度坐标。

用户定位

UserLocationActivity

package org.wp.activity;

import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class UserLocationActivity extends Activity {
	private TextView textView;
	private Button button;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		textView = (TextView) this.findViewById(R.id.textViewId);
		button = (Button) this.findViewById(R.id.buttonId);
		button.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				// 得到LocationManager对象
				LocationManager locationManager = (LocationManager) UserLocationActivity.this
						.getSystemService(Context.LOCATION_SERVICE);
				// 定义当前所使用的LocationProvider
				// 两次定位之间的间隔时间、间隔距离
				// 设置监听器
				locationManager.requestLocationUpdates(
						LocationManager.GPS_PROVIDER, 0, 0,
						new UserLocationListener());
			}
		});
	}

	class UserLocationListener implements LocationListener {
		@Override
		public void onLocationChanged(Location location) {
			// 经度
			double longitude = location.getLongitude();
			// 纬度
			double latitude = location.getLatitude();
			textView.setText("经纬度:" + longitude + "/" + latitude);
		}

		@Override
		public void onProviderDisabled(String provider) {
		}

		@Override
		public void onProviderEnabled(String provider) {
		}

		@Override
		public void onStatusChanged(String provider, int status, Bundle extras) {
		}
	}
}

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"
    >
	<TextView  
		android:id="@+id/textViewId"
	   	android:layout_width="fill_parent" 
	   	android:layout_height="wrap_content"
	   	android:text="经纬度:" 
	    />
	<Button
		android:id="@+id/buttonId"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="绑定监听器"
		/>	    
</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
	package="org.wp.activity" android:versionCode="1" android:versionName="1.0">
	<application android:icon="@drawable/icon" android:label="@string/app_name">
		<activity android:name=".UserLocationActivity" 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" />
	<!-- Allows an application to access fine (e.g., GPS) location -->
	<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
</manifest>