它有一个Android事件监听器的速度？

Question

我有一个用于速度测量的应用程序，可以检测用户何时高于或低于特定速度。我是否必须不断监控速度或我可以创建的事件？

Answer 1

您需要监控位置更改，当您收到警报时，您需要检查当前位置hasSpeed()

/**
 *
 */
private void requestUpdates() {
    locMan = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

    // loop through all providers, and register them to send updates
    List<String> providers = locMan.getProviders(false);
    for (String provider : providers) {
        Log.e("birthdroid", "registering provider " + provider);
        long minTimeMs = 5 * 60 * 1000;// 5 minute interval
        float minDistance = Application.LOCATION_HOT_RADIUS_IN_METERS;
        locMan.requestLocationUpdates(provider, minTimeMs, minDistance,
                getIntent());
    }

}

/**
 * convenient method to get pending intent
 * @return
 */
private PendingIntent getIntent() {
    Intent intent = new Intent(this, LocationReceiver.class);
    return PendingIntent.getBroadcast(
            getApplicationContext(), 0, intent, 0);
}

和接收者可以

public class LocationReceiver extends BroadcastReceiver {

    /*
     * (non-Javadoc)
     * 
     * @see android.content.BroadcastReceiver#onReceive(android.content.Context,
     * android.content.Intent)
     */
    @Override
    public void onReceive(Context context, Intent intent) {
        try {
            Bundle b = intent.getExtras();
            Location loc = (Location) b
                    .get(android.location.LocationManager.KEY_LOCATION_CHANGED);
            if (loc != null) {


            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Answer 2

没有速度事件，只要速度高于阈值，你就必须计算并发出“警报”。