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Android 当点击飞行模式都发生了什么？
source link: http://wuxiaolong.me/2019/04/14/AirplaneMode/
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今天中午午休时，我把手机开飞行模式了，能看到 WiFi 、蜂窝数据和蓝牙都关闭了，心想，这时候还能收到短信吗？顺着好奇心，我们不妨来研究一下源码，看看点击飞行模式都发生了什么？
基于 Android 9.0 源码分析。
AirplaneModeTile#handleClick
飞行模式设置入口，下拉状态栏，点击飞行模式图标，我们就从这里看起，其他入口逻辑差不多。这个源码位于AOSP/frameworks/base/packages/SystemUI/src/com/android/systemui/qs/tiles/AirplaneModeTile.java直接看其点击事件。
public class AirplaneModeTile extends QSTileImpl<BooleanState> {
//省略其他代码
@Override
public void handleClick() {
boolean airplaneModeEnabled = mState.value;
MetricsLogger.action(mContext, getMetricsCategory(), !airplaneModeEnabled);
if (!airplaneModeEnabled && Boolean.parseBoolean(
SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE))) {
Dependency.get(ActivityStarter.class).postStartActivityDismissingKeyguard(
new Intent(TelephonyIntents.ACTION_SHOW_NOTICE_ECM_BLOCK_OTHERS), 0);
return;
setEnabled(!airplaneModeEnabled);
private void setEnabled(boolean enabled) {
final ConnectivityManager mgr =
(ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
mgr.setAirplaneMode(enabled);
//省略其他代码
接下来调用 ConnectivityManager#setAirplaneMode 方法。
ConnectivityManager#setAirplaneMode
AOSP/frameworks/base/core/java/android/net/ConnectivityManager.java
@RequiresPermission(anyOf = {
android.Manifest.permission.NETWORK_SETTINGS,
android.Manifest.permission.NETWORK_SETUP_WIZARD,
android.Manifest.permission.NETWORK_STACK})
@SystemApi
public void setAirplaneMode(boolean enable) {
mService.setAirplaneMode(enable);
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
mService 是 IConnectivityManager，是个接口，其实现看 ConnectivityService#setAirplaneMode。
ConnectivityService#setAirplaneMode
/AOSP/frameworks/base/services/core/java/com/android/server
@Override
public void setAirplaneMode(boolean enable) {
enforceNetworkStackSettingsOrSetup();
final long ident = Binder.clearCallingIdentity();
final ContentResolver cr = mContext.getContentResolver();
Settings.Global.putInt(cr, Settings.Global.AIRPLANE_MODE_ON, encodeBool(enable));
Intent intent = new Intent(Intent.ACTION_AIRPLANE_MODE_CHANGED);
intent.putExtra("state", enable);
mContext.sendBroadcastAsUser(intent, UserHandle.ALL);
} finally {
Binder.restoreCallingIdentity(ident);
这里设置了飞行模式状态的系统变量以及发送 ACTION_AIRPLANE_MODE_CHANGED 系统广播，接下来看看该广播的接受。经过查找，ACTION_AIRPLANE_MODE_CHANGED 广播接受有好几次，，而手机开启或关闭飞行模式时，主要是开启或关闭 Radio 无线通信，其处理逻辑在 PhoneGlobals 类中。另外 WiFi 、蜂窝数据和蓝牙处理都能相应追踪到。
补充：什么是 Radio？Radio 是无线通信模块的驱动程序，负责网络通信。
PhoneGlobals
AOSP/packages/services/Telephony/src/com/android/phone/PhoneGlobals.java
public class PhoneGlobals extends ContextWrapper {
//省略其他代码
private void handleAirplaneModeChange(Context context, int newMode) {
int cellState = Settings.Global.getInt(context.getContentResolver(),
Settings.Global.CELL_ON, PhoneConstants.CELL_ON_FLAG);
boolean isAirplaneNewlyOn = (newMode == 1);
switch (cellState) {
case PhoneConstants.CELL_OFF_FLAG:
// Airplane mode does not affect the cell radio if user
// has turned it off.
break;
case PhoneConstants.CELL_ON_FLAG:
maybeTurnCellOff(context, isAirplaneNewlyOn);
break;
case PhoneConstants.CELL_OFF_DUE_TO_AIRPLANE_MODE_FLAG:
maybeTurnCellOn(context, isAirplaneNewlyOn);
break;
* Returns true if the radio must be turned off when entering airplane mode.
private boolean isCellOffInAirplaneMode(Context context) {
String airplaneModeRadios = Settings.Global.getString(context.getContentResolver(),
Settings.Global.AIRPLANE_MODE_RADIOS);
return airplaneModeRadios == null
|| airplaneModeRadios.contains(Settings.Global.RADIO_CELL);
private void setRadioPowerOff(Context context) {
Log.i(LOG_TAG, "Turning radio off - airplane");
Settings.Global.putInt(context.getContentResolver(), Settings.Global.CELL_ON,
PhoneConstants.CELL_OFF_DUE_TO_AIRPLANE_MODE_FLAG);
SystemProperties.set("persist.radio.airplane_mode_on", "1");
Settings.Global.putInt(getContentResolver(), Settings.Global.ENABLE_CELLULAR_ON_BOOT, 0);
PhoneUtils.setRadioPower(false);
private void setRadioPowerOn(Context context) {
Log.i(LOG_TAG, "Turning radio on - airplane");
Settings.Global.putInt(context.getContentResolver(), Settings.Global.CELL_ON,
PhoneConstants.CELL_ON_FLAG);
Settings.Global.putInt(getContentResolver(), Settings.Global.ENABLE_CELLULAR_ON_BOOT,
SystemProperties.set("persist.radio.airplane_mode_on", "0");
PhoneUtils.setRadioPower(true);
private void maybeTurnCellOff(Context context, boolean isAirplaneNewlyOn) {
if (isAirplaneNewlyOn) {
// If we are trying to turn off the radio, make sure there are no active
// emergency calls. If there are, switch airplane mode back to off.
TelecomManager tm = (TelecomManager) context.getSystemService(TELECOM_SERVICE);
if (tm != null && tm.isInEmergencyCall()) {
// Switch airplane mode back to off.
ConnectivityManager.from(this).setAirplaneMode(false);
Toast.makeText(this, R.string.radio_off_during_emergency_call, Toast.LENGTH_LONG)
.show();
Log.i(LOG_TAG, "Ignoring airplane mode: emergency call. Turning airplane off");
} else if (isCellOffInAirplaneMode(context)) {
setRadioPowerOff(context);
} else {
Log.i(LOG_TAG, "Ignoring airplane mode: settings prevent cell radio power off");
private void maybeTurnCellOn(Context context, boolean isAirplaneNewlyOn) {
if (!isAirplaneNewlyOn) {
setRadioPowerOn(context);
* Receiver for misc intent broadcasts the Phone app cares about.
private class PhoneAppBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(Intent.ACTION_AIRPLANE_MODE_CHANGED)) {
int airplaneMode = Settings.Global.getInt(getContentResolver(),
Settings.Global.AIRPLANE_MODE_ON, AIRPLANE_OFF);
// Treat any non-OFF values as ON.
if (airplaneMode != AIRPLANE_OFF) {
airplaneMode = AIRPLANE_ON;
handleAirplaneModeChange(context, airplaneMode);
} //省略其他代码
//省略其他代码
PhoneUtils.setRadioPower 会继续调用 GsmCdmaPhone#setRadioPower，调用 mSST.setRadioPower，最终由 mSST 对象向 RIL 对象发起关闭或开启 Radio 无线通信模块的请求，这里就不细看了，有兴趣可以自己继续跟下去。到这里我们就对“Android 当点击飞行模式都发生了什么？”流程有了大致了解，就酱紫，Over。
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