标签:android gps location locationmanager location-provider
我的应用程序不想使用GPS和使用网络获取位置.我通过分析纬度和经度来检查它们,它们有点随机(如网络位置).
如果我使用另一个使用GPS的应用程序(例如Endomondo Sports tracker),我会看到特征标记,这意味着GPS正在运行:
当我启动我的应用程序时,根本就没有标记.
我正在使用以下代码(Lars Vogella代码,来源:http://www.vogella.com/articles/AndroidLocationAPI/article.html):
import android.app.Activity;
import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;
public class ShowLocationActivity extends Activity implements LocationListener {
private TextView latituteField;
private TextView longitudeField;
private LocationManager locationManager;
private String provider;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
latituteField = (TextView) findViewById(R.id.TextView02);
longitudeField = (TextView) findViewById(R.id.TextView04);
// Get the location manager
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Define the criteria how to select the locatioin provider -> use
// default
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
// Initialize the location fields
if (location != null) {
System.out.println("Provider " + provider + " has been selected.");
onLocationChanged(location);
} else {
latituteField.setText("Location not available");
longitudeField.setText("Location not available");
}
}
/* Request updates at startup */
@Override
protected void onResume() {
super.onResume();
locationManager.requestLocationUpdates(provider, 400, 1, this);
}
/* Remove the locationlistener updates when Activity is paused */
@Override
protected void onPause() {
super.onPause();
locationManager.removeUpdates(this);
}
@Override
public void onLocationChanged(Location location) {
int lat = (int) (location.getLatitude());
int lng = (int) (location.getLongitude());
latituteField.setText(String.valueOf(lat));
longitudeField.setText(String.valueOf(lng));
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
Toast.makeText(this, "Enabled new provider " + provider,
Toast.LENGTH_SHORT).show();
}
@Override
public void onProviderDisabled(String provider) {
Toast.makeText(this, "Disabled provider " + provider,
Toast.LENGTH_SHORT).show();
}
}
当然我在AndroidManifest.xml文件中添加了权限:
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
有任何想法吗?
解决方法:
解:
您可以使用GPS而不是通过决定标准选择最佳提供商.
示例,替换:
locationManager.requestLocationUpdates(provider, 400, 1, this);
附:
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 400, 1, this);
阐释:
根据应用程序的使用情况,您必须选择特定的位置提供程序
即LocationManager.GPS_PROVIDER或LocationManager.NETWORK_PROVIDER
或者,您可以提供一些输入条件,如准确性,功率要求,货币成本等,并让Android决定最接近的匹配位置提供商
// Retrieve a list of location providers that have fine accuracy, no monetary cost, etc
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setCostAllowed(false);
String providerName = locManager.getBestProvider(criteria, true);
//and then you can make location update request with selected best provider
locationManager.requestLocationUpdates(provider, 400, 1, this);
请查看how to use locationmanager,how to specify Criteria和how getBestProvider method works以供参考
标签:android,gps,location,locationmanager,location-provider 来源: https://codeday.me/bug/20190620/1244043.html
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