Android GPS 开发

<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>