GPS定位系統的介紹

1：主要實作的功能：

（1）實作使用者的追蹤，可以得到使用者的經度和緯度

（2）得到本地可以提供定位服務的方式

（3）通過Criteria 條件的篩選，我們可以得到最好的，滿足要求的定位服務

<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:orientation="vertical" >

    <Button 

        android:id="@+id/locationButton"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="綁定監聽"

        />

     <Button 

        android:id="@+id/providerButton"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="檢視本地的定位服務方式"

        />

      <Button 

        android:id="@+id/bestproviderButton"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="選擇最好的提供定位的方式"

        />

</LinearLayout>

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package com.example.userlocation;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import po.UserLocation;

import android.support.v7.app.ActionBarActivity;

import android.app.SearchManager.OnCancelListener;

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.AsyncTask;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class UserLocaltionActivity extends ActionBarActivity {

private Button locationButton;

private LocationManager locationManager;

//擷取本地提供定位的方式

private Button providerButton;

//擷取本地滿足條件最好的定位服務方式

private Button bestProviderButton;

//追蹤使用者的位置

private List<UserLocation> list=new ArrayList<UserLocation>();

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_user_localtion);

locationButton =(Button)findViewById(R.id.locationButton);

providerButton =(Button)findViewById(R.id.providerButton);

bestProviderButton=(Button)findViewById(R.id.bestproviderButton);

locationButton.setOnClickListener(new LocationButtonListener());

providerButton.setOnClickListener(new ProviderLocation());

bestProviderButton.setOnClickListener(new BestProviderLocation());

}

class ProviderLocation implements OnClickListener{

@Override

public void onClick(View v) {

List<String> list=locationManager.getAllProviders();

for(String provider : list){

System.out.println(provider);

}

}

}

class BestProviderLocation implements OnClickListener{

@Override

public void onClick(View v) {

Criteria certial=new Criteria();

certial.setAccuracy(Criteria.ACCURACY_HIGH);

certial.setAltitudeRequired(false);

certial.setCostAllowed(false);

String bestprovider=locationManager.getBestProvider(certial, true);

System.out.println(bestprovider);

}

}

class LocationButtonListener implements OnClickListener{

@Override

public void onClick(View view) {

//擷取LocationManager的對象

   locationManager=(LocationManager)UserLocaltionActivity.this.getSystemService(Context.LOCATION_SERVICE);

//當使用者的位置發生變化的時候，該方法會被調用

locationManager.requestLocationUpdates(locationManager.GPS_PROVIDER, 0, 0, new GPSLocationListener());

}

}

class GPSLocationListener implements LocationListener{

@Override

public void onLocationChanged(Location location) {

//精度和緯度

UserLocation mylocation=new UserLocation();

mylocation.setLatitude(location.getLatitude());

mylocation.setLongation(location.getLongitude());

list.add(mylocation);

System.out.println(location.getLongitude());

System.out.println(location.getLatitude());

}

@Override

public void onProviderDisabled(String arg0) {

}

@Override

public void onProviderEnabled(String arg0) {

}

@Override

public void onStatusChanged(String arg0, int arg1, Bundle arg2) {

}

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.user_localtion, menu);

return true;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

// Handle action bar item clicks here. The action bar will

// automatically handle clicks on the Home/Up button, so long

// as you specify a parent activity in AndroidManifest.xml.

int id = item.getItemId();

if (id == R.id.action_settings) {

return true;

}

return super.onOptionsItemSelected(item);

}

}