从广播接收器（警报）类访问android全局变量

Question

我想创建可以从广泛的接收器类（重复警报）访问的全局变量。要创建全局变量，我使用了这个类：

public class GVar extends Application {
private Integer Hour;
private Integer Minute;

public void setHour(Integer hour) {
    Hour = hour;
}

public void setMinute(Integer minute) {
    Minute = minute;
}

public Integer getHour() {
    return Hour;
}

public Integer getMinute() {
    return Minute;
}
}

然后我的闹钟看起来像这样：

public class Alarm extends BroadcastReceiver {
private static Integer counter=0;

@Override
public void onReceive(Context context, Intent intent) {
    PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
    PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "");
    wl.acquire();

    // Put here YOUR code.
    //start activity
    Integer H=((GVar) this.getApplication()).getHour();

    Intent intentone = new Intent(context.getApplicationContext(), UssdCallActivity.class);
    intentone.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(intentone);
    //startActivity()

    //Toast.makeText(context, "Alarm! ("+counter.toString()+")", Toast.LENGTH_SHORT).show(); // For example
    counter++;
    wl.release();

}

getApplication（）方法无法解决。 从MainActivity类调用时，同样的方法也有效。