android - android- requestLocationUpdates() 在 ICS 中工作，但在 android 2.2 中不工作

Question

在 android 2.2 中运行应用程序时，GPS 正在搜索位置，但不显示任何位置。此应用程序在 ICS 版本中运行良好。会是什么原因？

提前致谢。

这是完整的代码：-

package com.example.gps;

import android.app.Activity;
import android.location.Criteria;
import android.location.LocationListener;
import android.location.LocationManager;
import android.location.Location;
import android.os.Bundle;
import android.view.Window;
import android.widget.TextView;
import java.io.IOException;

public class GPSmap extends Activity implements LocationListener {

    public String mLatLongString = "";
    private String mBest;
    private TextView myLocationText;
    LocationManager mLocManager;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_LEFT_ICON);
        setContentView(R.layout.activity_gpsmap);
        myLocationText = (TextView) findViewById(R.id.myLocationText);
        getWindow().setFeatureDrawableResource(Window.FEATURE_LEFT_ICON,
                R.drawable.ic_launcher);
        mLocManager = (LocationManager) getSystemService(LOCATION_SERVICE);
        try {
            Criteria mCriteria = new Criteria();
            mCriteria.setAccuracy(Criteria.ACCURACY_FINE);
            mBest = mLocManager.getBestProvider(mCriteria, true);
            if (mLocManager.isProviderEnabled(mBest)) {
            }
        } catch (NullPointerException e) {
            myLocationText = (TextView) findViewById(R.id.myLocationText);
            myLocationText.setText("\n\nGPS Tracking: Disabled.");
        }
    }

    private void updateWithNewLocation(Location mLocation) {
        myLocationText = (TextView) findViewById(R.id.myLocationText);
        if (mLocation != null) {
            double mLatitude = mLocation.getLatitude();
            double mLongitude = mLocation.getLongitude();
            double mLatitudeFormatted = (double) Math.round(mLatitude * 100000) / 100000;
            double mLongitudeFormatted = (double) Math
                    .round(mLongitude * 100000) / 100000;
            mLatLongString = mLatitudeFormatted + ", " + mLongitudeFormatted;
            myLocationText.setText(mLatLongString);
        } else {
            mLatLongString = "\n\nNo Location Found.";
            myLocationText.setText(mLatLongString);
        }
    }

    /** Function to listen to location change */
    public void onLocationChanged(Location location) {
        updateWithNewLocation(location);
    }

    public void onProviderDisabled(String provider) {
        updateWithNewLocation(null);
    }

    public void onProviderEnabled(String provider) {}

    public void onStatusChanged(String provider, int status, Bundle extras) {}

    protected void onResume() {
        try {
            super.onResume();
            mLocManager.removeUpdates((android.location.LocationListener) this);
            mLocManager.requestLocationUpdates(mBest, 60000L, 0.0f, this);
        } catch (NullPointerException e) {
            myLocationText = (TextView) findViewById(R.id.myLocationText);
            myLocationText.setText("\n\nGPS Tracking: Disabled.");
        }
    }
}