Java Measurement.Listener方法代码示例

import com.openxc.measurements.Measurement; //导入方法依赖的package包/类
public void register(Class<? extends Measurement> measurementType,
        Measurement.Listener listener) {
    try {
        // A bit of a hack to cache this measurement's ID field so we
        // can deserialize incoming measurements of this type. Why don't we
        // have a getId() in the Measurement interface? Ah, because it would
        // have to be static and you can't have static methods in an
        // interface. It would work if we were passed an instance of the
        // measurement in this function, but we don't really have that when
        // adding a listener.
        BaseMeasurement.getKeyForMeasurement(measurementType);
    } catch(UnrecognizedMeasurementTypeException e) { }

    mMeasurementTypeListeners.put(measurementType, listener);
}
 

import com.openxc.measurements.Measurement; //导入方法依赖的package包/类
public synchronized void unregister(
        Class<? extends Measurement> measurementType,
        Measurement.Listener listener) {
    mMeasurementTypeListeners.remove(measurementType, listener);
}
 

import com.openxc.measurements.Measurement; //导入方法依赖的package包/类
/**
 * Register to receive asynchronous updates for a specific Measurement type.
 *
 * A Measurement is a specific, known VehicleMessage subtype.
 *
 * Use this method to register an object implementing the
 * Measurement.Listener interface to receive real-time updates
 * whenever a new value is received for the specified measurementType.
 *
 * Make sure you unregister your listeners with
 * VehicleManager.removeListener(...) when your activity or service closes
 * and no longer requires updates.
 *
 * @param measurementType The class of the Measurement
 *      (e.g. VehicleSpeed.class) the listener was listening for
 * @param listener An listener instance to receive the callback.
 */
public void addListener(Class<? extends Measurement> measurementType,
        Measurement.Listener listener) {
    Log.i(TAG, "Adding listener " + listener + " for " + measurementType);
    mNotifier.register(measurementType, listener);
}
 

import com.openxc.measurements.Measurement; //导入方法依赖的package包/类
/**
 * Unregister a previously registered Measurement.Listener instance.
 *
 * When an application is no longer interested in receiving measurement
 * updates (e.g. when it's pausing or exiting) it should unregister all
 * previously registered listeners to save on CPU.
 *
 * @param measurementType The class of the requested Measurement
 *      (e.g. VehicleSpeed.class)
 * @param listener The listener to remove.
 */
public void removeListener(Class<? extends Measurement> measurementType,
        Measurement.Listener listener) {
    Log.i(TAG, "Removing listener " + listener + " for " + measurementType);
    mNotifier.unregister(measurementType, listener);
}