android GPS定位

最新推荐文章于 2024-07-10 16:44:07 发布

转载最新推荐文章于 2024-07-10 16:44:07 发布 · 854 阅读

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#android gps

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本文深入探讨了Android应用中如何使用LocationManager获取GPS位置信息，并实现位置更新机制，包括获取最佳位置对象、位置更新监听及室内定位策略。

public class LocationMianActivity extends AppCompatActivity {

    LocationManager locationManager;
    TextView textView;
    Location location;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.location_main_activity);

        textView = (TextView) findViewById(R.id.txt_content);
        locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
        // 获取location对象
        location = getBestLocation(locationManager);

        updateView(location);
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 3000, 8, new LocationListener() {

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

                    @Override
                    public void onProviderEnabled(String provider) {
                        updateView(locationManager.getLastKnownLocation(provider));
                    }

                    @Override
                    public void onProviderDisabled(String provider) {
                        updateView(null);
                    }

                    @Override
                    public void onLocationChanged(Location location) {
                        location = getBestLocation(locationManager);// 每次都去获取GPS_PROVIDER优先的location对象
                        updateView(location);
                    }
                });
    }

    private void updateView(Location location) {
        if (location != null) {
            StringBuffer sb = new StringBuffer();
            sb.append("位置信息：\n");
            sb.append("经度：" + location.getLongitude() + ", 纬度：" + location.getLatitude());
            textView.setText(sb.toString());
        } else {
            textView.setText("");
        }
    }

    /**
     * 获取location对象，优先以GPS_PROVIDER获取location对象，当以GPS_PROVIDER获取到的locaiton为null时
     * ，则以NETWORK_PROVIDER获取location对象，这样可保证在室内开启网络连接的状态下获取到的location对象不为空
     * @param locationManager
     * @return
     */
    private Location getBestLocation(LocationManager locationManager) {
        Location result = null;
        if (locationManager != null) {
            result = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            if (result != null) {
                return result;
            } else {
                result = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                return result;
            }
        }
        return result;
    }
}