package basic.android.lesson26;



import android.app.Activity;

import android.content.Context;

import android.location.Criteria;

import android.location.Location;

import android.location.LocationListener;

import android.location.LocationManager;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;



public  class MainActivity extends Activity {



        TextView tv1;

        Location location;



        @Override

         public  void onCreate(Bundle savedInstanceState) {

                super.onCreate(savedInstanceState);

                setContentView(R.layout.main);



                 //  定义UI组件

                Button b1  =  (Button) findViewById(R.id.button1);

                tv1  =  (TextView) findViewById(R.id.textView1);



                 //  获取LocationManager对象

                LocationManager lm  =  (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);



                 //  定义Criteria对象

                Criteria criteria  =   new  Criteria();

                 //  设置定位精确度 Criteria.ACCURACY_COARSE 比较粗略， Criteria.ACCURACY_FINE则比较精细

                criteria.setAccuracy(Criteria.ACCURACY_FINE);

                 //  设置是否需要海拔信息 Altitude

                criteria.setAltitudeRequired( true );

                 //  设置是否需要方位信息 Bearing

                criteria.setBearingRequired( true );

                 //  设置是否允许运营商收费

                criteria.setCostAllowed( true );

                 //  设置对电源的需求

                criteria.setPowerRequirement(Criteria.POWER_LOW);



                 //  获取GPS信息提供者

                 String  bestProvider  =  lm.getBestProvider(criteria,  true );

                 Log .i( " yao " ,  " bestProvider =  "   +  bestProvider);



                 //  获取定位信息

                location  =  lm.getLastKnownLocation(bestProvider);



                 //  给按钮绑定点击监听器

                b1.setOnClickListener( new  View.OnClickListener() {

                        @Override

                         public  void onClick(View v) {

                                updateLocation(location);

                        }

                });



                 //  位置监听器

                LocationListener locationListener  =   new  LocationListener() {



                         //  当位置改变时触发

                        @Override

                         public  void onLocationChanged(Location location) {

                                 Log .i( " yao " , location.toString());

                                updateLocation(location);

                        }



                         //  Provider失效时触发

                        @Override

                         public  void onProviderDisabled( String  arg0) {

                                 Log .i( " yao " , arg0);



                        }



                         //  Provider可用时触发

                        @Override

                         public  void onProviderEnabled( String  arg0) {

                                 Log .i( " yao " , arg0);

                        }



                         //  Provider状态改变时触发

                        @Override

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

                                 Log .i( " yao " ,  " onStatusChanged " );

                        }

                };



                 //  500毫秒更新一次，忽略位置变化

                lm.requestLocationUpdates(bestProvider,  500 ,  0 , locationListener);



        }



         //  更新位置信息

         private  void updateLocation(Location location) {

                 if  (location ! =   null ) {

                        tv1.setText( " 定位对象信息如下： "   +  location.toString()  +   " \n\t其中经度： "   +  location.getLongitude()  +   " \n\t其中纬度： "

                                         +  location.getLatitude());

                }  else  {

                         Log .i( " yao " ,  " 没有获取到定位对象Location " );

                }

        }

}

< ! --  粗略定位授权  -->

< uses  - permission = ""  android:name = " android.permission.ACCESS_COARSE_LOCATION " ></ uses >

< ! --  精细定位授权  -->

< uses  - permission = ""  android:name = " android.permission.ACCESS_FINE_LOCATION " ></ uses >

< ! --  模拟定位授权  -->

< uses  - permission = ""  android:name = " android.permission.ACCESS_MOCK_LOCATION " ></ uses >

< ! --  网络访问授权  -->

< uses  - permission = ""  android:name = " android.permission.INTERNET " ></ uses >