在项目\frameworks\base\wifi\java\android\net\wifi\WifiStateMachine.java里面，有如下的代码，是设置wifi热点保持状态的：如下：
private class HotspotAutoDisableObserver extends ContentObserver {
public HotspotAutoDisableObserver(Handler handler) {
super(handler);
mContext.getContentResolver().registerContentObserver(Settings.System.getUriFor(
Settings.System.WIFI_HOTSPOT_AUTO_DISABLE), false, this);
}
@Override
public void onChange(boolean selfChange) {
super.onChange(selfChange);
mDuration = Settings.System.getInt(mContext.getContentResolver(), Settings.System.WIFI_HOTSPOT_AUTO_DISABLE,
Settings.System.WIFI_HOTSPOT_AUTO_DISABLE_FOR_FIVE_MINS);
if (mDuration != Settings.System.WIFI_HOTSPOT_AUTO_DISABLE_OFF && mPluggedType == 0) {
if (mClientNum == 0 && WifiStateMachine.this.getCurrentState() == mTetheredState) {
mAlarmManager.cancel(mIntentStopHotspot);
Xlog.d(TAG, "Set alarm for setting changed, mDuration:" + mDuration);
mAlarmManager.set(AlarmManager.RTC_WAKEUP,
System.currentTimeMillis() + mDuration * HOTSPOT_DISABLE_MS, mIntentStopHotspot);
}
} else {
mAlarmManager.cancel(mIntentStopHotspot);
}
}
}
修改默认值为始终：
mDuration = Settings.System.getInt(mContext.getContentResolver(), Settings.System.WIFI_HOTSPOT_AUTO_DISABLE,
Settings.System.WIFI_HOTSPOT_AUTO_DISABLE_OFF); 最关键的部分是修改初始化：
private void initializeExtra() {
PowerManager powerManager = (PowerManager)mContext.getSystemService(Context.POWER_SERVICE);
mDhcpWakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "DHCP_WAKELOCK");
mDhcpWakeLock.setReferenceCounted(false);
mHotspotNative = new WifiNative("ap0");
mHotspotMonitor = new WifiMonitor(this, mHotspotNative);
HandlerThread wifiThread = new HandlerThread("WifiSMForObserver");
wifiThread.start();
mHotspotAutoDisableObserver = new HotspotAutoDisableObserver(new Handler(wifiThread.getLooper()));
Intent stopHotspotIntent = new Intent(ACTION_STOP_HOTSPOT);
mIntentStopHotspot = PendingIntent.getBroadcast(mContext, STOP_HOTSPOT_REQUEST, stopHotspotIntent, 0);
//mDuration = Settings.System.getInt(mContext.getContentResolver(), Settings.System.WIFI_HOTSPOT_AUTO_DISABLE,
// Settings.System.WIFI_HOTSPOT_AUTO_DISABLE_FOR_FIVE_MINS);
mDuration = Settings.System.getInt(mContext.getContentResolver(), Settings.System.WIFI_HOTSPOT_AUTO_DISABLE,
Settings.System.WIFI_HOTSPOT_AUTO_DISABLE_OFF);//---------修改为默认常开
// M: For stop scan after screen off in disconnected state feature @{
Intent stopScanIntent = new Intent(ACTION_STOP_SCAN, null);
mStopScanIntent = PendingIntent.getBroadcast(mContext, STOPSCAN_REQUEST, stopScanIntent, 0);
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("com.mtk.beamplus.activated");
intentFilter.addAction("com.mtk.beamplus.deactivated");
intentFilter.addAction(ACTION_STOP_HOTSPOT);
intentFilter.addAction(IWifiFwkExt.AUTOCONNECT_SETTINGS_CHANGE);
intentFilter.addAction(DisplayManager.ACTION_WIFI_DISPLAY_STATUS_CHANGED);
intentFilter.addAction(TelephonyIntents.ACTION_SIM_STATE_CHANGED);
intentFilter.addAction(Intent.ACTION_DUAL_SIM_MODE_CHANGED);
intentFilter.addAction(ACTION_STOP_SCAN);
final boolean isHotspotAlwaysOnWhilePlugged = mContext.getResources().getBoolean(
com.mediatek.internal.R.bool.is_mobile_hotspot_always_on_while_plugged);
Xlog.d(TAG, "isHotspotAlwaysOnWhilePlugged:" + isHotspotAlwaysOnWhilePlugged);
if (isHotspotAlwaysOnWhilePlugged) {
intentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
}
BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
Xlog.d(TAG, "onReceive, action:" + action);
if (action.equals("com.mtk.beamplus.activated")) {
mBeamPlusStarted.set(true);
sendMessage(M_CMD_UPDATE_BGSCAN);
} else if (action.equals("com.mtk.beamplus.deactivated")) {
mBeamPlusStarted.set(false);
sendMessage(M_CMD_UPDATE_BGSCAN);
} else if (action.equals(ACTION_STOP_HOTSPOT)) {
mWifiManager.setWifiApEnabled(null, false);
int wifiSavedState = 0;
try {
wifiSavedState = Settings.Global.getInt(mContext.getContentResolver(),
Settings.Global.WIFI_SAVED_STATE);
} catch (Settings.SettingNotFoundException e) {
Xlog.e(TAG, "SettingNotFoundException:" + e);
}
Xlog.d(TAG, "Received stop hotspot intent, wifiSavedState:" + wifiSavedState);
if (wifiSavedState == 1) {
mWifiManager.setWifiEnabled(true);
Settings.Global.putInt(mContext.getContentResolver(), Settings.Global.WIFI_SAVED_STATE, 0);
}
} else if (action.equals(IWifiFwkExt.AUTOCONNECT_SETTINGS_CHANGE)) {
sendMessage(M_CMD_UPDATE_SETTINGS);
} else if (action.equals(DisplayManager.ACTION_WIFI_DISPLAY_STATUS_CHANGED)) {
WifiDisplayStatus status = (WifiDisplayStatus)intent.getParcelableExtra(
DisplayManager.EXTRA_WIFI_DISPLAY_STATUS);
Xlog.d(TAG, "Received ACTION_WIFI_DISPLAY_STATUS_CHANGED.");
setWfdConnected(status);
sendMessage(M_CMD_UPDATE_BGSCAN);
} else if (action.equals(Intent.ACTION_BATTERY_CHANGED)) {
if (isHotspotAlwaysOnWhilePlugged) {
int pluggedType = intent.getIntExtra("plugged", 0);
Xlog.d(TAG, "ACTION_BATTERY_CHANGED pluggedType:" + pluggedType + ", mPluggedType:" + mPluggedType);
if (mPluggedType != pluggedType) {
mPluggedType = pluggedType;
if (mDuration != Settings.System.WIFI_HOTSPOT_AUTO_DISABLE_OFF && mPluggedType == 0) {
if (mClientNum == 0 && WifiStateMachine.this.getCurrentState() == mTetheredState) {
mAlarmManager.cancel(mIntentStopHotspot);
Xlog.d(TAG, "Set alarm for ACTION_BATTERY_CHANGED changed, mDuration:" + mDuration);
mAlarmManager.set(AlarmManager.RTC_WAKEUP,
System.currentTimeMillis() + mDuration * HOTSPOT_DISABLE_MS, mIntentStopHotspot);
}
} else {
mAlarmManager.cancel(mIntentStopHotspot);
}
}
}
} else if (action.equals(TelephonyIntents.ACTION_SIM_STATE_CHANGED)) {
String iccState = intent.getStringExtra(IccCardConstants.INTENT_KEY_ICC_STATE);
Xlog.d(TAG, "iccState:" + iccState);
if (!iccState.equals(IccCardConstants.INTENT_VALUE_ICC_LOADED)) {
return;
}
sendMessage(M_CMD_UPDATE_COUNTRY_CODE);
} else if (action.equals(Intent.ACTION_DUAL_SIM_MODE_CHANGED)) {
sendMessage(M_CMD_UPDATE_COUNTRY_CODE);
} else if (action.equals(ACTION_STOP_SCAN)) {
sendMessage(M_CMD_SLEEP_POLICY_STOP_SCAN);
}
}
};
mContext.registerReceiver(receiver, intentFilter);
mPppoeInfo = new PPPOEInfo();
mPppoeLinkProperties = new LinkProperties();
}
另外，System.xxxx的常量定义在源码中的路径：项目\frameworks\base\core\java\android\provider\Settings.java