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 }