Android获取位置信息 - GPS定位 Network定位

时间：2021-07-19 23:52:19
1. 用GPS或者Network获取位置信息
src/com/wind/whereami/LocationSend.java 
package com.wind.whereami;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.provider.Settings;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class LocationSend extends Activity implements OnClickListener {

protected static final String TAG = "LocationSend";
private Button mSendLocationButton;
private Button mGetLocationButton;
private TextView mLocationInfo;
private LocationManager mLocationManager;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_location_send);
mSendLocationButton = (Button) this.findViewById(R.id.send_location);
mGetLocationButton = (Button) this.findViewById(R.id.get_location);
mLocationInfo = (TextView) this.findViewById(R.id.location_info);
mSendLocationButton.setOnClickListener(this);
mGetLocationButton.setOnClickListener(this);

mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.location_send, menu);
return true;
}

@Override
public void onClick(View v) {
if (v == mSendLocationButton) {
/*
  * 发起地址信息短串请求，一个位置的地理信息一可以通过GeoCode/反GeoCode搜索获得.
  * mSearch 为 MKSearch象，
  * 参数pt为要分享的位置的经纬度坐标 ，name和addr为百度地图客户端在展示该位置时显示的名称和地址.
  */
//GeoPoint pt = new GeoPoint((int)(39.945*1E6),(int)(116.404*1E6));


} else if (v == mGetLocationButton) {
//方法1：指定GPS或者Network来获取位置
/*checkGPSSettings();
Location location = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2000, 1, locationListener);*/
checkNetworkSettings();
Location location = mLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 2000, 1, locationListener);

getLocationInfo(location);

//方法2：获取高精度的位置
//getLocation();
}
}

private Location getLocation()
{
//查找服务信息
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE); //定位精度: 最高
criteria.setAltitudeRequired(false);//海拔信息：不需要
criteria.setBearingRequired(false);//方位信息: 不需要
criteria.setCostAllowed(true);//是否允许付费
criteria.setPowerRequirement(Criteria.POWER_LOW);  //耗电量: 低功耗

String provider = mLocationManager.getBestProvider(criteria, true); //获取Provider信息，为gps或network
Log.v(TAG, "provider = " + provider);
Location location = mLocationManager.getLastKnownLocation(provider);

mLocationManager.requestLocationUpdates(provider, 1000, 0, locationListener);
return location;
}

private void checkGPSSettings() {
if (mLocationManager.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER)) {
Toast.makeText(this, "GPS模块正常", Toast.LENGTH_SHORT).show();
return;
}

Toast.makeText(this, "请开启GPS！", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(Settings.ACTION_LOCALE_SETTINGS);
startActivityForResult(intent, 0); // 此为设置完成后返回到获取界面

}

private void checkNetworkSettings() {
if (mLocationManager.isProviderEnabled(android.location.LocationManager.NETWORK_PROVIDER)) {
Toast.makeText(this, "NETWORK_PROVIDER模块正常", Toast.LENGTH_SHORT).show();
return;
}

Toast.makeText(this, "请开启NETWORK_PROVIDER！", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivityForResult(intent, 0); // 此为设置完成后返回到获取界面

}

private void getLocationInfo(Location location) {
String latLongInfo;
if (location != null) {
double lat = location.getLatitude();
double lng = location.getLongitude();
latLongInfo = "Lat:" + lat + "nLong:" + lng;

mLocationInfo.setText(latLongInfo);
} else {
latLongInfo = "No location found";
mLocationInfo.setText(latLongInfo);
}
}

private final LocationListener locationListener = new LocationListener() {
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
Log.v(TAG, "onStatusChanged");
}

@Override
public void onProviderEnabled(String provider) {
getLocationInfo(null);
Log.v(TAG, "onProviderEnabled");
}

@Override
public void onProviderDisabled(String provider) {
getLocationInfo(null);
Log.v(TAG, "onProviderDisabled");
}

@Override
public void onLocationChanged(Location location) {
getLocationInfo(location);
Toast.makeText(LocationSend.this, "onLocationChanged", 3000).show();
}
};
}




2. 记得添加权限
AndroidManifest.xml 
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.wind.whereami"
    android:versionCode="1"
    android:versionName="1.0" >
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.INTERNET" />

    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.wind.whereami.LocationSend"
            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>
</manifest>

3. 使用的layout文件
/res/layout/activity_location_send.xml 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".LocationSend" 
    android:orientation="vertical">
    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />
    <Button
        android:id="@+id/send_location"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/textView1"
        android:text="@string/send_location" />

    <Button
        android:id="@+id/get_location"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/textView1"
        android:layout_below="@+id/button1"
        android:text="@string/get_location" />

    <TextView
        android:id="@+id/location_info"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button2"
        android:layout_below="@+id/button2"
        android:layout_marginTop="19dp"
        android:text="@string/location_info" />
</LinearLayout>
补充一点，很多人会说，GPS无法定位，Location location = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
location一直为空。我解释一下：去调用这个函数，多大数返回都是空的，因为GPS没有那么强，一下就获取到位置了。所以会注册一个listener来监听位置的改变
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2000, 1, locationListener);
有人还说会拿不到数据，那么你首先确定你的GPS是好用的（我就犯过错误是用网络定过之后百度地图上留下了我最近的位置，关掉网络，还是能定位，貌似是GPS定的，实际上我的GPS根本不能用，只好的测试方法就是到户外，看看GPS会不会跟着你走，顺便测试下你写的程序）
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