摘要:Android GPS Example
Implement LocationListener interface
package com.kent.gps;
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;
public class GpsTestActivity extends Activity implements LocationListener {
private LocationManager mLocationManager;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
mLocationManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, this);
TextView mTextView00 = (TextView)findViewById(R.id.TextView00);
mTextView00.setText("GPS Information");
}
@Override
public void onResume(){
if (mLocationManager != null) {
}
super.onResume();
}
@Override
protected void onPause() {
if (mLocationManager != null) {
mLocationManager.removeUpdates((LocationListener) this);
}
super.onPause();
}
public void onLocationChanged(Location location) {
TextView mTextView01 = (TextView)findViewById(R.id.TextView01);
TextView mTextView02 = (TextView)findViewById(R.id.TextView02);
TextView mTextView03 = (TextView)findViewById(R.id.TextView03);
TextView mTextView04 = (TextView)findViewById(R.id.TextView04);
TextView mTextView05 = (TextView)findViewById(R.id.TextView05);
TextView mTextView06 = (TextView)findViewById(R.id.TextView06);
TextView mTextView07 = (TextView)findViewById(R.id.TextView07);
mTextView01.setText("Latitude： " + String.valueOf(location.getLatitude()));
mTextView02.setText("Longitude： " + String.valueOf(location.getLongitude()));
mTextView03.setText("Accuracy： " + String.valueOf(location.getAccuracy()));
mTextView04.setText("Latitude： " + String.valueOf(location.getAltitude()));
mTextView05.setText("Time： " + String.valueOf(location.getTime()));
mTextView06.setText("Speed： " + String.valueOf(location.getSpeed()));
mTextView07.setText("Bearing： " + String.valueOf(location.getBearing()));
}
public void onProviderDisabled(String provider) {
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
Framework:
GpsLocation結構: 表示定位相關資訊
typedef struct {
// set to sizeof(GpsLocation)
size_t size;
//旗標位元
uint16_t flags;
//緯度
double latitude;
//經度
double longitude;
//高度
double altitude;
//速度
float speed;
//方位
float bearing;
//精準度
float accuracy;
//時間戳記
GpsUtcTime timestamp;
} GpsLocation;
GpsStatusValue定義: 表示GPS晶片狀態
typedef uint16_t GpsStatusValue; //儲存GPS狀態 下面狀態的 0~4
#define GPS_STATUS_NONE 0
#define GPS_STATUS_SESSION_BEGIN 1//啟動導航
#define GPS_STATUS_SESSION_END 2//停止導航
#define GPS_STATUS_ENGINE_ON 3//未啟動導航
#define GPS_STATUS_ENGINE_OFF 4//電源關閉
GpsSvInfo結構: 描述衛星狀態
typedef struct {
size_t size;
int prn; //偽亂碼 即衛星編號
float snr;//衛星訊號
float elevation;//高度
float azimuth;//方位角
} GpsSvInfo;
GpsInterface結構: 連通上下層 為主要GPS的架構
typedef struct {
size_t size;
int (*init)( GpsCallbacks* callbacks );//初始化 並設定回調函數
int (*start)( void );//啟動導航
int (*stop)( void ); //關閉導航
void (*cleanup)( void );
int (*inject_time)(GpsUtcTime time, int64_t timeReference, int uncertainty);//插入目前時間
int (*inject_location)(double latitude, double longitude, float accuracy);//插入位置資訊
void (*delete_aiding_data)(GpsAidingData flags);//刪除輔助資訊
int (*set_position_mode)(GpsPositionMode mode, GpsPositionRecurrence recurrence, uint32_t
min_interval, uint32_t preferred_accuracy, uint32_t preferred_time);//設定位置模式
const void* (*get_extension)(const char* name);//取得擴充介面
} GpsInterface;