Android不同系统版本依然能调用到正确的API方法Demo—

private static final Class<?>[] mSetForegroundSignature = new Class[] {

    boolean.class};

private static final Class<?>[] mStartForegroundSignature = new Class[] {

    int.class, Notification.class};

private static final Class<?>[] mStopForegroundSignature = new Class[] {

    boolean.class};

private NotificationManager mNM;

private Method mSetForeground;

private Method mStartForeground;

private Method mStopForeground;

private Object[] mSetForegroundArgs = new Object[1];

private Object[] mStartForegroundArgs = new Object[2];

private Object[] mStopForegroundArgs = new Object[1];

void invokeMethod(Method method, Object[] args) {

    try {

        method.invoke(this, args);

    } catch (InvocationTargetException e) {

        // Should not happen.

        Log.w("ApiDemos", "Unable to invoke method", e);

    } catch (IllegalAccessException e) {

        // Should not happen.

        Log.w("ApiDemos", "Unable to invoke method", e);

    }

}

/**

 * This is a wrapper around the new startForeground method, using the older

 * APIs if it is not available.

 */

void startForegroundCompat(int id, Notification notification) {

    // If we have the new startForeground API, then use it.

    if (mStartForeground != null) {

        mStartForegroundArgs[0] = Integer.valueOf(id);

        mStartForegroundArgs[1] = notification;

        invokeMethod(mStartForeground, mStartForegroundArgs);

        return;

    }

    // Fall back on the old API.

    mSetForegroundArgs[0] = Boolean.TRUE;

    invokeMethod(mSetForeground, mSetForegroundArgs);

    mNM.notify(id, notification);

}

/**

 * This is a wrapper around the new stopForeground method, using the older

 * APIs if it is not available.

 */

void stopForegroundCompat(int id) {

    // If we have the new stopForeground API, then use it.

    if (mStopForeground != null) {

        mStopForegroundArgs[0] = Boolean.TRUE;

        invokeMethod(mStopForeground, mStopForegroundArgs);

        return;

    }

    // Fall back on the old API.  Note to cancel BEFORE changing the

    // foreground state, since we could be killed at that point.

    mNM.cancel(id);

    mSetForegroundArgs[0] = Boolean.FALSE;

    invokeMethod(mSetForeground, mSetForegroundArgs);

}

@Override

public void onCreate() {

    mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);

    try {

        mStartForeground = getClass().getMethod("startForeground",

                mStartForegroundSignature);

        mStopForeground = getClass().getMethod("stopForeground",

                mStopForegroundSignature);

        return;

    } catch (NoSuchMethodException e) {

        // Running on an older platform.

        mStartForeground = mStopForeground = null;

    }

    try {

        mSetForeground = getClass().getMethod("setForeground",

                mSetForegroundSignature);

    } catch (NoSuchMethodException e) {

        throw new IllegalStateException(

                "OS doesn't have Service.startForeground OR Service.setForeground!");

    }

}

@Override

public void onDestroy() {

    // Make sure our notification is gone.

    stopForegroundCompat(R.string.foreground_service_started);

}
摘自：http://developer.android.com/reference/android/app/Service.html#startForeground(int, android.app.Notification)
巴特西

Android不同系统版本依然能调用到正确的API方法Demo——Service调用startForeground举例

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