Android架构

LocationManager

2016-05-11  本文已影响5341人  TTTqiu

一、LocationManager 基本用法


1. 获取 LocationManager 的实例。
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
2. 选择一个位置提供器。
String provider = LocationManager.NETWORK_PROVIDER;
判断有哪些位置提供器可用:
List<String> providerList = locationManager.getProviders(true);
// 传入 true 就表示只有启用的位置提供器才会被返回。

if (providerList.contains(LocationManager.GPS_PROVIDER)) {
    provider = LocationManager.GPS_PROVIDER;
} else if (providerList.contains(LocationManager.NETWORK_PROVIDER)) {
    provider = LocationManager.NETWORK_PROVIDER;
} 
3. 将位置提供器传入到 getLastKnownLocation() 方法中,得到一个 Location 对象。
Location location = locationManager.getLastKnownLocation(provider);

//纬度 location.getLatitude()
//经度 location.getLongitude()
4. 用 requestLocationUpdates() 方法在设备位置发生改变的时候获取到最新的位置信息。
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 10, new LocationListener() {
    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onLocationChanged(Location location) {
    }
});

二、确定自己位置的经纬度


public class MainActivity extends Activity {
    private TextView positionTextView;
    private LocationManager locationManager;
    private String provider;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        positionTextView = (TextView) findViewById(R.id.position_text_view);
        locationManager = (LocationManager) getSystemService(Context. LOCATION_SERVICE);
        // 获取所有可用的位置提供器
        List<String> providerList = locationManager.getProviders(true);
        if (providerList.contains(LocationManager.GPS_PROVIDER)) {
            provider = LocationManager.GPS_PROVIDER;
        } else if (providerList.contains(LocationManager.NETWORK_PROVIDER)) {
            provider = LocationManager.NETWORK_PROVIDER;
        } else {
            // 当没有可用的位置提供器时,弹出Toast提示用户
            Toast.makeText(this, "No location provider to use", Toast.LENGTH_SHORT).show();
            return;
        }
        Location location = locationManager.getLastKnownLocation(provider);
        if (location != null) {
            // 显示当前设备的位置信息
            showLocation(location);
        }
        locationManager.requestLocationUpdates(provider, 5000, 1, locationListener);
    }

    protected void onDestroy() {
        super.onDestroy();
        if (locationManager != null) {
            // 关闭程序时将监听器移除
            locationManager.removeUpdates(locationListener);
        }
    }

    LocationListener locationListener = new LocationListener() {
        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
        }
        @Override
        public void onProviderEnabled(String provider) {
        }
        @Override
        public void onProviderDisabled(String provider) {
        }
        @Override
        public void onLocationChanged(Location location) {
            // 更新当前设备的位置信息
            showLocation(location);
        }
    };

    private void showLocation(Location location) {
        String currentPosition = "latitude is " + location.getLatitude() + "\n"+ "longitude is " + location.getLongitude();
        positionTextView.setText(currentPosition);
    }
}
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.locationtest"
    android:versionCode="1"
    android:versionName="1.0" >
    ......
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    ......
</manifest>
上一篇 下一篇

猜你喜欢

热点阅读