[Android]_ch9.11_GoogleMap定位技術

[Android]_ch9.11_GoogleMap定位技術

android.location套件提供位置相關功能，但無須搭配Google地圖，所以不需要申請API金鑰

如果用到定位技術，依然要在manifest檔案內加入下列設定：

允許網路定位

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

允許GPS定位

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

定位，就是找到自己位置

取得LocationManager物件

建立Criteria規則物件

呼叫LocationManager.getBestProvider(Criteria
criteria,
boolean
enabledOnly)取得最適合的定位名稱（provider）

呼叫LocationManager.getLastKnownLocation(String
provider)
取得自己最新位置

更新自己位置

呼叫LocationManager.requestLocationUpdates(String
provider, long minTime,
float minDistance,
LocationListener
listener)註冊LocationListener

位置改變時，會自動呼叫LocationListener的onLocationChanged
(Location location) 並傳入新的位置

package com.gjun.ch23_location;

import java.sql.Date;

import android.app.Activity;

import android.location.Criteria;

import android.location.Location;

import android.location.LocationListener;

import android.location.LocationManager;

import android.os.Bundle;

import android.text.format.DateFormat;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends Activity {

EditText et1;

TextView tv1,tv2;

Button btn1;

LocationManager LM;

Location myLocation;

Criteria criteria;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

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

        tv2=(TextView)findViewById(R.id.textView2);

        btn1=(Button)findViewById(R.id.button1);

        et1=(EditText)findViewById(R.id.editText1);

        LM=(LocationManager)getSystemService(LOCATION_SERVICE);

        criteria=new Criteria();

        criteria.setAccuracy(Criteria.ACCURACY_FINE);

        String best=LM.getBestProvider(criteria,true);

        Location location=LM.getLastKnownLocation(best);

        this.myLocation=location;

        updateLocation(myLocation);

        btn1.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

}

});

    }

    public void updateLocation(Location location){

    StringBuilder sb=new StringBuilder("當前最新位置資訊如下:\n");

    Date date=new Date(location.getTime());

    DateFormat dateFormat=new DateFormat();

    sb.append("定位時間:"+dateFormat.format("MM/dd/yy h:mm", date)+"\n");

    sb.append("緯度:"+location.getLatitude()+"\n");

    sb.append("經度:"+location.getLongitude()+"\n");

    sb.append("精準度:"+location.getAccuracy()+"\n");

    sb.append("高度:"+location.getAltitude()+"\n");

    sb.append("速度:"+location.getSpeed()+"\n");

    sb.append("方向:"+location.getBearing()+"\n");

    sb.append("定位方式:"+location.getProvider()+"\n");

    tv1.setText(sb);

    }

    LocationListener listener=new LocationListener() {

@Override

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

// TODO Auto-generated method stub

}

@Override

public void onProviderEnabled(String provider) {

// TODO Auto-generated method stub

}

@Override

public void onProviderDisabled(String provider) {

// TODO Auto-generated method stub

}

@Override

public void onLocationChanged(Location location) {

myLocation=location;

updateLocation(myLocation);

Toast.makeText(MainActivity.this, "位置改變!", Toast.LENGTH_SHORT).show();

}

};

@Override

protected void onResume() {

String best=LM.getBestProvider(criteria, true);

LM.requestLocationUpdates(best, 10000, 50, listener);

}

}