我想通过android找到用户的当前位置，但总是返回特定区域10米范围内的位置。它不会返回实际的地方。我使用google play services location api来代替当前位置。
我如何检索准确的纬度和经度？
答案 0 :(得分：1)
试试这个。我希望它对你有所帮助
public class MainActivity extends Activity implements LocationListener {
private static final String TAG = "MainActivity";
LocationManager lm;
private static TextView lt;
private static TextView ln;
private static TextView ac;
private static WebView webview;
String provider;
Location l;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ln = (TextView) findViewById(R.id.lng);
lt = (TextView) findViewById(R.id.lat);
ac = (TextView) findViewById(R.id.acc);
webview = (WebView) findViewById(R.id.webview);
// get location service
lm = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
boolean isGPSProviderEnabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
boolean isNETProviderEnabled = lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if( !isGPSProviderEnabled || !isNETProviderEnabled) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Location is off"); // GPS not found
builder.setMessage("Location setting open"); // Want to enable?
builder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialogInterface, int i) {
startActivity(new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS));
}
});
builder.setNegativeButton(android.R.string.no, null);
builder.create().show();
return;
}
Criteria c = new Criteria();
// criteria object will select best service based on
// Accuracy, power consumption, response, bearing and monetary cost
// set false to use best service otherwise it will select the default
// Sim network
// and give the location based on sim network
// now it will first check satellite than Internet than Sim network
// location
provider = lm.getBestProvider(c, false);
// now you have best provider
// get location
l = lm.getLastKnownLocation(provider);
if (l != null) {
// get latitude and longitude of the location
double lng = l.getLongitude();
double lat = l.getLatitude();
double acc = l.getAccuracy();
// display on text view
updateview(lng, lat, acc);
} else {
// Register the listener with the Location Manager to receive location updates
lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 3000, 0, this);
ln.setText("No Provider");
lt.setText("No Provider");
ac.setText("No Provider");
}
}
// If you want location on changing place also than use below method
// otherwise remove all below methods and don't implement location listener
@Override
public void onLocationChanged(Location l) {
Log.v(TAG, "onLocationChanged");
double lng = l.getLongitude();
double lat = l.getLatitude();
double acc = l.getAccuracy();
updateview(lng, lat, acc);
}
private void updateview(final double lng, final double lat, final double acc) {
Log.v(TAG, "updateview");
Log.v(TAG, "lng:"+lng);
Log.v(TAG, "lat:"+lat);
Log.v(TAG, "acc:"+acc);
ln.setText(String.valueOf(lng));
lt.setText(String.valueOf(lat));
ac.setText(String.valueOf(acc));
String URL = "http://maps.google.com/maps/api/staticmap?center="+lat+","+lng+"&zoom=15&size=500x200&markers=color:red|"+lat+","+lng+"&sensor=false";
webview.getSettings().setLoadWithOverviewMode(true);
webview.getSettings().setUseWideViewPort(true);
webview.loadUrl(URL);
webview.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_UP:
String uri = String.format(Locale.getDefault(), "geo:%f,%f", lat, lng);
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
startActivity(intent);
return v.performClick();
}
return false;
}
});
}
@Override
public void onProviderDisabled(String arg0) {
Log.v(TAG, "onProviderDisabled"+arg0);
}
@Override
public void onProviderEnabled(String arg0) {
Log.v(TAG, "onProviderEnabled"+arg0);
}
@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
Log.v(TAG, "onStatusChanged"+arg0);
}
这是XML：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#89b" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="18dp"
android:layout_marginTop="16dp"
android:text="Longitude:" />
<TextView
android:id="@+id/lng"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView1"
android:layout_marginLeft="60dp"
android:layout_marginTop="14dp"
android:layout_toRightOf="@+id/textView1"
android:text=""
android:textSize="30sp" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/textView1"
android:layout_below="@+id/lng"
android:layout_marginTop="53dp"
android:text="Latitude:" />
<TextView
android:id="@+id/lat"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/lng"
android:layout_below="@+id/textView3"
android:text=""
android:textSize="30sp" />
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/textView3"
android:layout_below="@+id/lat"
android:layout_marginTop="53dp"
android:text="Accuracy:" />
<TextView
android:id="@+id/acc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/lat"
android:layout_below="@+id/textView4"
android:text=""
android:textSize="30sp" />
<WebView
android:id="@+id/webview"
android:layout_width="500dp"
android:layout_height="200dp"
android:layout_alignParentLeft="true"
android:layout_below="@+id/acc"
android:layout_marginTop="22dp" />
</RelativeLayout>