Question

我在我的设备上实现了一个简单的应用程序，可以获取并显示您的GPS经度和纬度。然而，即使我在我的建筑物中移动，坐标也没有改变。这是我的实施：

foodActivity.java

public class foodActivity extends Activity {

LocationListener mlocListener;
Location location;
String provider;
private double latitude = 0;
private double longitude = 0;
private Handler mHandler;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);

    setContentView(R.layout.activity_food);

    getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.header_food);


    LocationManager mlocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

    Criteria criteria = new Criteria();
    provider = mlocManager.getBestProvider(criteria, false);

    if (provider != null && !provider.equals("")) {

        location = mlocManager.getLastKnownLocation(provider);
        mlocListener = new MyLocationListener();
        mlocManager.requestLocationUpdates(provider, 0, 0, mlocListener);

        if (location != null) {
            mHandler = new Handler();
            mHandler.postDelayed(updateTask, 0);

        } else {
            Toast.makeText(getBaseContext(), "Location can;t be retrieved", Toast.LENGTH_SHORT).show();
        }
    } else {
        Toast.makeText(getBaseContext(), "No Provider found", Toast.LENGTH_SHORT).show();
    }
}
/* Class My Location Listener */

public class MyLocationListener implements LocationListener {

    @Override
    public void onLocationChanged(Location loc) {
        // TODO Auto-generated method stub

        TextView lats = (TextView) findViewById(R.id.tv_latitude);
        TextView longs = (TextView) findViewById(R.id.tv_longitude);

        latitude = loc.getLatitude();
        longitude = loc.getLongitude();

        lats.setText("Latitude :" + latitude);
        longs.setText("Longitude :" + longitude);

    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub
    }

    @Override
    public void onProviderEnabled(String provider) {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "GPS Enabled", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "GPS Disabled", Toast.LENGTH_SHORT).show();
    }

}

public Runnable updateTask = new Runnable(){
    public void run(){
        mlocListener.onLocationChanged(location);
        mHandler.postDelayed(updateTask,50000);
    }
};
}

activity_food.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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.example.hkuapp.foodActivity">

<TextView
    android:text="Hello"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/tv_latitude"
    android:layout_below="@+id/tv_longitude"
    android:layout_alignParentLeft="true"
    android:layout_marginTop="32dp" />

<TextView
    android:text="Yo"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/tv_longitude"/>

</RelativeLayout>

Answer 1

在此方法mlocManager.requestLocationUpdates(provider, 0, 0, mlocListener);中，第二个参数是位置更新之间的时间间隔，以毫秒为单位。尝试将其更改为1000（1秒）。

Answer 2

从我在您的代码中看到的内容：

您只需每50秒更新一次您的位置
您说您在室内进行了测试，因此您的设备可能无法检测到任何位置变化。

GPS坐标在移动时不会改变 - Android

2 个答案: