Android GPS 开发

AndroidManifest.xml

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

main.java

package com.mrsoft.mrgps.app.mr;

import android.app.Activity;
import android.app.ActivityManager;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;

public class main extends Activity {
    private TextView tv;
    private LocationManager lm;
    private Criteria criteria;
    private Location location;
    private final static int MENU_ABOUT = Menu.FIRST;  
    private final static int MENU_EXIT = Menu.FIRST+1;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        tv = (TextView)findViewById(R.id.tv);
        
        lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        
        if (!lm.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER))
        {
            Toast.makeText(this, "GPS已关闭,请手动开启GPS后再试！", Toast.LENGTH_SHORT).show();
            return;
        }
        else
        {
            Toast.makeText(this, "GPS定位中...", Toast.LENGTH_SHORT).show();
        }
        
        criteria = new Criteria();
        criteria.setAccuracy(Criteria.ACCURACY_FINE);    // 设置精确度
        criteria.setAltitudeRequired(true);                // 设置请求海拔
        criteria.setBearingRequired(true);                // 设置请求方位
        criteria.setCostAllowed(true);                    // 设置允许运营商收费
        criteria.setPowerRequirement(Criteria.POWER_LOW); // 低功耗
        
        String provider = lm.getBestProvider(criteria, true);
        location = lm.getLastKnownLocation(provider);
        newLocalGPS(location);
        // 监听1秒一次 忽略位置变化
        lm.requestLocationUpdates(provider, 1*1000, 0, new locationListener());
    }
    
    class locationListener implements LocationListener
    {

        @Override
        public void onLocationChanged(Location location) {
            // TODO Auto-generated method stub
            newLocalGPS(location);
        }

        @Override
        public void onProviderDisabled(String provider) {
            // TODO Auto-generated method stub
            newLocalGPS(null);
        }

        @Override
        public void onProviderEnabled(String provider) {
            // TODO Auto-generated method stub
            
        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            // TODO Auto-generated method stub
            
        }
        
    }
    
    private void newLocalGPS(Location location)
    {
        if (location!=null)
        {
            double latitude = location.getLatitude(); //精度
            double longitude = location.getLongitude(); // 纬度
            double speed = location.getSpeed();    // 速度
            double altitude = location.getAltitude();    // 海拔
            double bearing = location.getBearing();    // 方位
            tv.setText("精度"+latitude+'\n'+
                           "纬度"+longitude+'\n'+
                           "速度"+speed+"m/s"+'\n'+
                           "海拔"+altitude+"m"+'\n'+
                           "方位"+bearing+'\n');
        }
        else
        {
            // 未获取地理信息位置
            tv.setText("地理信息位置未知或正在获取地理信息位置中...");
        }
    }
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // TODO Auto-generated method stub
        menu.add(0, MENU_ABOUT, 1, "关于");  
        menu.add(0, MENU_EXIT, 2, "退出");
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // TODO Auto-generated method stub
        switch (item.getItemId())
        {
        case MENU_ABOUT:
             AlertDialog.Builder bd = new Builder(main.this);  
                bd.setMessage("mrGPS.apk\n版本:1.0\n作者:mrandexe");  
                bd.setTitle("关于");  
                bd.setPositiveButton("确认", new OnClickListener(){  
                    @Override  
                    public void onClick(DialogInterface arg0, int arg1) {  
                        // TODO Auto-generated method stub  
                        arg0.dismiss();  
                    }  
                });  
                bd.create().show(); 
            break;
        case MENU_EXIT:
            exit();
            break;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override  
    public boolean onKeyDown(int keyCode, KeyEvent event) {  
        // TODO Auto-generated method stub  
        if (keyCode==KeyEvent.KEYCODE_BACK && event.getRepeatCount()==0)  
        {  
            exit();  
            return true;  
        }  
        return super.onKeyDown(keyCode, event);  
    } 
    
    private void exit()  
    {  
         AlertDialog.Builder builder = new Builder(main.this);  
         builder.setMessage("确认退出吗？");  
         builder.setTitle("提示");  
         builder.setPositiveButton("确认", new OnClickListener(){  
             @Override  
             public void onClick(DialogInterface arg0, int arg1) {  
                 // TODO Auto-generated method stub  
                 arg0.dismiss();
                 ActivityManager actMgr = (ActivityManager)getSystemService(ACTIVITY_SERVICE);  
                 actMgr.restartPackage(getPackageName());
             }  
         });  
         builder.setNegativeButton("取消", new OnClickListener(){  

             @Override  
             public void onClick(DialogInterface dialog, int which) {  
                 // TODO Auto-generated method stub  
                 dialog.dismiss();  
             }  
         });  
         builder.create().show();
         
    }
}

main.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="fill_parent">    <TextView android:text="TextView" android:layout_width="wrap_content" android:id="@+id/tv" android:layout_height="wrap_content"></TextView></LinearLayout>