android 如何判断当前是否为飞行模式

android中如何判断系统当前是否处于飞行模式中：

public static boolean isairmodeon(context context) {
return (settings.system.getint(context.getcontentresolver(),
settings.system.airplane_mode_on, 0) == 1 ? true : false);
}

如何切换飞行模式

public static void setairplanemode(context context, boolean enabling) {
settings.system.putint(context.getcontentresolver(),
settings.system.airplane_mode_on, enabling ? 1 : 0);
intent intent = new intent(intent.action_airplane_mode_changed);
intent.putextra("state", enabling);
context.sendbroadcast(intent);
}

如何注册和取消自动飞行时间
注册

alarmmanager am = (alarmmanager) context
.getsystemservice(context.alarm_service);
intent intent = new intent(air_alert_action);
parcel out = parcel.obtain();
air.writetoparcel(out, 0);
out.setdataposition(0);
intent.putextra(air_raw_data, out.marshall());
pendingintent sender = pendingintent.getbroadcast(context, 0, intent,
pendingintent.flag_cancel_current);
am.set(alarmmanager.rtc_wakeup, attimeinmillis, sender);取消
alarmmanager am = (alarmmanager) context
.getsystemservice(context.alarm_service);
endingintent sender = pendingintent.getbroadcast(context, 0,
new intent(action), pendingintent.flag_cancel_current);
am.cancel(sender);

如何控制切换飞行模式的硬件（cell,bluetooth,wifi）

settings.system.putstring(context.getcontentresolver(),
settings.system.airplane_mode_radios, air_mode_radios);air_mode_radios为一个这样的字符串，看android源码中android/provider/settings.java

/***
* whether airplane mode is on.
*/
public static final string airplane_mode_on = "airplane_mode_on";
/***
* constant for use in airplane_mode_radios to specify bluetooth radio.
*/
public static final string radio_bluetooth = "bluetooth";
/***
* constant for use in airplane_mode_radios to specify wi-fi radio.
*/
public static final string radio_wifi = "wifi";
/***
* constant for use in airplane_mode_radios to specify cellular radio.
*/
public static final string radio_cell = "cell";
/***
* a comma separated list of radios that need to be disabled when airplane mode
* is on. this overrides wifi_on and bluetooth_on, if wi-fi and bluetooth are
* included in the comma separated list.
*/
public static final string airplane_mode_radios = "airplane_mode_radios";
/***
* a comma separated list of radios that should to be disabled when airplane mode
* is on, but can be manually reenabled by the user. for example, if radio_wifi is
* added to both airplane_mode_radios and airplane_mode_toggleable_radios, then wifi
* will be turned off when entering airplane mode, but the user will be able to reenable
* wifi in the settings app.
*
* {@hide}
*/
public static final string airplane_mode_toggleable_radios = "airplane_mode_toggleable_radios";

如果air_mode_radios=“cell,bluetooth,wifi”,这就便是切换飞行模式是切换字符串中的这cell,bluetooth,wifi硬件，我们可以通过设置该字符串的值，来控制这三个硬件是否在切换飞行模式是进行切换状态。