GPS相关知识

  1 public class Main extends Activity implements OnClickListener {
  2     private LocationManager locationManager;
  3     private Location location;
  4     private Criteria criteria;
  5     private String provider;
  6 
  7     private TextView tv_Latitude;// 纬度
  8     private TextView tv_Longitude;// 经度
  9     private TextView tv_High;// 海拔
 10     private TextView tv_Direction;// 方向
 11     private TextView tv_Speed;// 速度
 12     private TextView tv_GpsTime;// 获取的时间
 13     private TextView tv_InfoType;// 信息的来源
 14     private EditText et_SetTimeSpace;// 设置时间间隔
 15 
 16     private Button manual_btn;
 17     private Button settimespace_btn;
 18     private Button exit_btn;
 19 
 20     public void onCreate(Bundle savedInstanceState) {
 21         super.onCreate(savedInstanceState);
 22         setContentView(R.layout.main);
 23         setTitle("GPS");
 24         // 隐藏输入法
 25         getWindow().setSoftInputMode(
 26                 WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
 27         initView();
 28         initLocation();
 29     }
 30 
 31     // 初始化
 32     @SuppressWarnings("static-access")
 33     private void initLocation() {
 34         // 初始化locationManager：获得系统所提供的location_service
 35         locationManager = (LocationManager) getSystemService(this.LOCATION_SERVICE);
 36         /**
 37          * LocationManager.GPS_PROVIDER
 38          * 
 39          * 精度比较高，但是慢而且消耗电力， 而且可能因为天气原因或者障碍物而无法获取卫星信息，另外设备可能没有GPS模块；
 40          * LocationManager.NETWORK_PROVIDER
 41          * 
 42          * 通过网络获取定位信息，精度低，耗电少，获取信息速度较快，不依赖GPS模块。
 43          */
 44         if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
 45             /* 注意：criteria有多种设置 */
 46 
 47             // 第一种：criteria
 48             criteria = new Criteria();
 49             criteria.setAccuracy(Criteria.ACCURACY_FINE);// 高精度
 50             criteria.setAltitudeRequired(true);// 显示海拔
 51             criteria.setBearingRequired(true);// 显示方向
 52             criteria.setSpeedRequired(true);// 显示速度
 53             criteria.setCostAllowed(false);// 不允许有花费
 54             criteria.setPowerRequirement(Criteria.POWER_LOW);// 低功耗
 55 
 56             // 第二种：criteria
 57             // criteria = new Criteria();
 58             // criteria.setAccuracy(Criteria.ACCURACY_FINE);//设置为最大精度
 59             // criteria.setAltitudeRequired(false);//不要求海拔信息
 60             // criteria.setBearingRequired(false);//不要求方位信息
 61             // criteria.setCostAllowed(true);//是否允许付费
 62             // criteria.setPowerRequirement(Criteria.POWER_LOW);//对电量的要求
 63 
 64             provider = locationManager.getBestProvider(criteria, true);
 65 
 66             locationManager.requestLocationUpdates(provider, 5000, 10,
 67                     locationListener);// 位置变化监听,默认5秒一次,距离10米以上
 68         } else
 69             showInfo(null, -1);
 70     }
 71 
 72     /**
 73      * 获取GPS相应的数据
 74      * 
 75      * @return
 76      */
 77     private GPSModel getLastPosition() {
 78         GPSModel gpsModel = new GPSModel();
 79         location = locationManager.getLastKnownLocation(provider);
 80         if (location != null) {
 81             gpsModel.Latitude = (double) (location.getLatitude());
 82             gpsModel.Longitude = (double) (location.getLongitude());
 83             gpsModel.High = location.getAltitude();
 84             gpsModel.Direct = location.getBearing();
 85             gpsModel.Speed = location.getSpeed();
 86 
 87             Date d = new Date();
 88             d.setTime(location.getTime());
 89             gpsModel.GpsTime = DateFormat.format("yyyy-MM-dd kk:mm:ss", d)
 90                     .toString();
 91             d = null;
 92         }
 93         return gpsModel;
 94     }
 95 
 96     // 显示信息
 97     private void showInfo(GPSModel gpsModel, int infotype) {
 98         if (gpsModel == null) {
 99             if (infotype == -1) {
100                 tv_Latitude.setText("GPS功能已关闭");
101                 tv_Longitude.setText("");
102                 tv_High.setText("");
103                 tv_Direction.setText("");
104                 tv_Speed.setText("");
105                 tv_GpsTime.setText("");
106                 tv_InfoType.setText("");
107                 manual_btn.setEnabled(false);
108                 settimespace_btn.setEnabled(false);
109                 et_SetTimeSpace.setEnabled(false);
110             }
111         } else {
112             double y = gpsModel.Latitude;// 纬度
113             double x = gpsModel.Longitude;// 经度
114             tv_Latitude.setText("纬度：y=" + String.valueOf(y));
115             tv_Longitude.setText("经度：x=" + String.valueOf(x));
116             tv_High.setText(String.format("海拔:%f", gpsModel.High));
117             tv_Direction.setText(String.format("方向:%f", gpsModel.Direct));
118             tv_Speed.setText(String.format("速度:%f", gpsModel.Speed));
119             tv_GpsTime.setText(String.format("GPS时间:%s", gpsModel.GpsTime));
120 
121             gpsModel.InfoType = infotype;
122             switch (infotype) {
123             case 1:
124                 tv_InfoType.setText("信息来源状态:手动获取更新");
125                 break;
126             case 2:
127                 tv_InfoType.setText("信息来源状态:位置改变更新");
128                 break;
129             }
130         }
131 
132     }
133 
134     @SuppressWarnings("static-access")
135     @Override
136     public void onClick(View v) {
137         if (v.equals(manual_btn)) {
138             showInfo(getLastPosition(), 1);
139         }
140         if (v.equals(settimespace_btn)) {
141             if (TextUtils.isEmpty(et_SetTimeSpace.getText().toString())) {
142                 Toast.makeText(this, "请输入更新时间间隔", Toast.LENGTH_LONG).show();
143                 et_SetTimeSpace.requestFocus();
144                 return;
145             }
146 
147             int timespace = Integer.valueOf(et_SetTimeSpace.getText()
148                     .toString()) * 1000;
149             if (locationManager.isProviderEnabled(locationManager.GPS_PROVIDER))
150                 locationManager.requestLocationUpdates(provider, timespace, 10,
151                         locationListener);
152         }
153         if (v.equals(exit_btn))
154             android.os.Process.killProcess(android.os.Process.myPid());
155     }
156 
157     private final LocationListener locationListener = new LocationListener() {
158 
159         @Override
160         public void onLocationChanged(Location arg0) {
161             showInfo(getLastPosition(), 2);
162         }
163 
164         @Override
165         public void onProviderDisabled(String arg0) {
166             showInfo(null, -1);
167         }
168 
169         @Override
170         public void onProviderEnabled(String arg0) {
171         }
172 
173         @Override
174         public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
175         }
176 
177     };
178 
179     private void initView() {
180         tv_Latitude = (TextView) findViewById(R.id.tvlatitude);
181         tv_Longitude = (TextView) findViewById(R.id.tvlongitude);
182         tv_High = (TextView) findViewById(R.id.tvhigh);
183         tv_Direction = (TextView) findViewById(R.id.tvdirection);
184         tv_Speed = (TextView) findViewById(R.id.tvspeed);
185         tv_GpsTime = (TextView) findViewById(R.id.tvgpstime);
186         tv_InfoType = (TextView) findViewById(R.id.tvinfotype);
187         et_SetTimeSpace = (EditText) findViewById(R.id.ettimespace);
188 
189         manual_btn = (Button) findViewById(R.id.btnmanual);
190         manual_btn.setOnClickListener(this);
191         settimespace_btn = (Button) findViewById(R.id.btnsettimespace);
192         settimespace_btn.setOnClickListener(this);
193         exit_btn = (Button) findViewById(R.id.btnexit);
194         exit_btn.setOnClickListener(this);
195     }
196 
197 }