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android 上如何判断是否已获取GPS位置？

发布于 2024-11-05 06:45:17 字数 115 浏览 0 评论 0原文

假设我有一个按钮，仅当系统知道确切的用户位置时才会调用另一个活动。我创建了一个对话框，要求用户在禁用 GPS 的情况下打开它，但是当用户启用 GPS 并再次按下按钮时，我可能还没有确切的位置。谁能帮我解决这个问题吗？

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书信已泛黄 2024-11-12 06:45:17

您需要创建一个LocationListener，并等待回调。 api docs 对此进行了很好的描述：

// Acquire a reference to the system Location Manager
LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);

// Define a listener that responds to location updates
LocationListener locationListener = new LocationListener() {
  public void onLocationChanged(Location location) {
     // When you get here you have a location...
     useTheNewLocationToEnableTheButton(location); 
  }

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

  public void onProviderEnabled(String provider) {}

  public void onProviderDisabled(String provider) {}
};

// Register the listener with the Location Manager to receive location updates
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);

You need to create a LocationListener, and wait for the callback. It is pretty well described in the api docs:

// Acquire a reference to the system Location Manager
LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);

// Define a listener that responds to location updates
LocationListener locationListener = new LocationListener() {
  public void onLocationChanged(Location location) {
     // When you get here you have a location...
     useTheNewLocationToEnableTheButton(location); 
  }

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

  public void onProviderEnabled(String provider) {}

  public void onProviderDisabled(String provider) {}
};

// Register the listener with the Location Manager to receive location updates
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);

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梦醒灬来后我 2024-11-12 06:45:17

您可以监听 GpsStatus 事件，以确保用户确实启用了 GPS (GPS_EVENT_STARTED)，并在 GPS 获得定位时收到通知 (GPS_EVENT_FIRST_FIX)。

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踏月而来 2024-11-12 06:45:17

如果您不知道坐标，最好的方法是显示 ProgressDialog 在检索位置时，获取位置后，关闭 ProgressDialog 并启动您的活动。

final LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
LocationListener locationListener = new LocationListener() {
  public void onLocationChanged(Location location) {
    //here you can get coordinates via location.getLongitude() and
    //location.getLatitude() methods, dismiss the progress dialog and
    //start your activity
    locationManager.removeUpdates(this);
  }
  public void onStatusChanged(String provider, int status, Bundle extras) {}
  public void onProviderEnabled(String provider) {}
  public void onProviderDisabled(String provider) {}
};
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);

If you don't know coordinates, the best way is to display a ProgressDialog while retrieving a location and, when you got it, dismiss ProgressDialog and launch your activity.

final LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
LocationListener locationListener = new LocationListener() {
  public void onLocationChanged(Location location) {
    //here you can get coordinates via location.getLongitude() and
    //location.getLatitude() methods, dismiss the progress dialog and
    //start your activity
    locationManager.removeUpdates(this);
  }
  public void onStatusChanged(String provider, int status, Bundle extras) {}
  public void onProviderEnabled(String provider) {}
  public void onProviderDisabled(String provider) {}
};
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);

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