要使用Android API獲取GNSS(全球導航衛星系統)的詳細狀態,您需要使用LocationManager
類和相關的接口
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
LocationManager
實例:LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
boolean isGnssSupported = locationManager.getProvider(LocationManager.GPS_PROVIDER) != null;
GnssStatus.Callback
實例以接收GNSS狀態更新:private GnssStatus.Callback gnssStatusCallback = new GnssStatus.Callback() {
@Override
public void onStarted() {
// GNSS已啟動
}
@Override
public void onStopped() {
// GNSS已停止
}
@Override
public void onFirstFix(int ttffMillis) {
// 第一次定位成功,ttffMillis為定位時間(毫秒)
}
@Override
public void onSatelliteStatusChanged(GnssStatus status) {
// GNSS衛星狀態發生變化,可以獲取詳細信息
int numSatellites = status.getSatelliteCount();
for (int i = 0; i < numSatellites; i++) {
int svid = status.getSvid(i);
float cn0DbHz = status.getCn0DbHz(i);
float elevationDegrees = status.getElevationDegrees(i);
float azimuthDegrees = status.getAzimuthDegrees(i);
boolean hasAlmanacData = status.hasAlmanacData(i);
boolean hasEphemerisData = status.hasEphemerisData(i);
boolean usedInFix = status.usedInFix(i);
// 處理衛星信息
}
}
};
GnssStatus.Callback
以開始接收GNSS狀態更新:if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
locationManager.registerGnssStatusCallback(gnssStatusCallback);
} else {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_CODE_LOCATION_PERMISSION);
}
GnssStatus.Callback
以停止接收GNSS狀態更新:locationManager.unregisterGnssStatusCallback(gnssStatusCallback);
請注意,這些代碼示例僅適用于Android N(API級別24)及更高版本。對于較早的Android版本,您需要使用GpsStatus.Listener
而不是GnssStatus.Callback
。