[SettingsLib] Wrapper for the "fix connectivity" Settings action (a8460318) · Commits · e / os / android_frameworks_base

packages/SettingsLib/src/com/android/settingslib/connectivity/ConnectivitySubsystemsRecoveryManager.java

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		/*
		* Copyright (C) 2020 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		package com.android.settingslib.connectivity;

		import android.annotation.NonNull;
		import android.content.BroadcastReceiver;
		import android.content.Context;
		import android.content.Intent;
		import android.content.IntentFilter;
		import android.content.pm.PackageManager;
		import android.net.wifi.WifiManager;
		import android.os.Handler;
		import android.os.HandlerExecutor;
		import android.provider.Settings;
		import android.telephony.PhoneStateListener;
		import android.telephony.TelephonyManager;
		import android.text.TextUtils;
		import android.util.Log;

		/**
		* An interface class to manage connectivity subsystem recovery/restart operations.
		*/
		public class ConnectivitySubsystemsRecoveryManager {
		private static final String TAG = "ConnectivitySubsystemsRecoveryManager";

		private final Context mContext;
		private final Handler mHandler;
		private RecoveryAvailableListener mRecoveryAvailableListener = null;

		private static final long RESTART_TIMEOUT_MS = 15_000; // 15 seconds

		private WifiManager mWifiManager = null;
		private TelephonyManager mTelephonyManager = null;
		private final BroadcastReceiver mApmMonitor = new BroadcastReceiver() {
		@Override
		public void onReceive(Context context, Intent intent) {
		RecoveryAvailableListener listener = mRecoveryAvailableListener;
		if (listener != null) {
		listener.onRecoveryAvailableChangeListener(isRecoveryAvailable());
		}
		}
		};
		private boolean mApmMonitorRegistered = false;
		private boolean mWifiRestartInProgress = false;
		private boolean mTelephonyRestartInProgress = false;
		private RecoveryStatusCallback mCurrentRecoveryCallback = null;
		private final BroadcastReceiver mWifiMonitor = new BroadcastReceiver() {
		@Override
		public void onReceive(Context context, Intent intent) {
		if (!mWifiRestartInProgress \|\| mCurrentRecoveryCallback == null) {
		stopTrackingWifiRestart();
		}

		// TODO: harden this code to avoid race condition. What if WiFi toggled just before
		// recovery triggered. Either use new broadcasts from framework or detect more state
		// changes.
		boolean recoveryDone = false;
		if (TextUtils.equals(intent.getAction(), WifiManager.WIFI_STATE_CHANGED_ACTION)) {
		if (intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE,
		WifiManager.WIFI_STATE_UNKNOWN) == WifiManager.WIFI_STATE_ENABLED) {
		recoveryDone = true;
		}
		} else if (TextUtils.equals(intent.getAction(),
		WifiManager.WIFI_AP_STATE_CHANGED_ACTION)) {
		if (intent.getIntExtra(WifiManager.EXTRA_WIFI_AP_STATE,
		WifiManager.WIFI_AP_STATE_FAILED) == WifiManager.WIFI_AP_STATE_ENABLED) {
		recoveryDone = true;
		}
		}

		if (recoveryDone) {
		mWifiRestartInProgress = false;
		stopTrackingWifiRestart();
		checkIfAllSubsystemsRestartsAreDone();
		}
		}
		};
		private final PhoneStateListener mPhoneStateListener = new PhoneStateListener() {
		@Override
		public void onRadioPowerStateChanged(int state) {
		if (!mTelephonyRestartInProgress \|\| mCurrentRecoveryCallback == null) {
		stopTrackingTelephonyRestart();
		}

		if (state == TelephonyManager.RADIO_POWER_ON) {
		mTelephonyRestartInProgress = false;
		stopTrackingTelephonyRestart();
		checkIfAllSubsystemsRestartsAreDone();
		}
		}
		};

		public ConnectivitySubsystemsRecoveryManager(@NonNull Context context,
		@NonNull Handler handler) {
		mContext = context;
		mHandler = new Handler(handler.getLooper());

		if (mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_WIFI)) {
		mWifiManager = mContext.getSystemService(WifiManager.class);
		if (mWifiManager == null) {
		Log.e(TAG, "WifiManager not available!?");
		}
		}

		if (mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_TELEPHONY)) {
		mTelephonyManager = mContext.getSystemService(TelephonyManager.class);
		if (mTelephonyManager == null) {
		Log.e(TAG, "TelephonyManager not available!?");
		}
		}
		}

		/**
		* A listener which indicates to the caller whether a recovery operation is available across
		* the specified technologies.
		*
		* Set using {@link #setRecoveryAvailableListener(RecoveryAvailableListener)}, cleared
		* using {@link #clearRecoveryAvailableListener()}.
		*/
		public interface RecoveryAvailableListener {
		/**
		* Called whenever the recovery availability status changes.
		*
		* @param isAvailable True if recovery is available across ANY of the requested
		* technologies, false if recovery is not available across ALL of the
		* requested technologies.
		*/
		void onRecoveryAvailableChangeListener(boolean isAvailable);
		}

		/**
		* Set a {@link RecoveryAvailableListener} to listen to changes in the recovery availability
		* operation for the specified technology(ies).
		*
		* @param listener Listener to be triggered
		*/
		public void setRecoveryAvailableListener(@NonNull RecoveryAvailableListener listener) {
		mHandler.post(() -> {
		mRecoveryAvailableListener = listener;
		startTrackingRecoveryAvailability();
		});
		}

		/**
		* Clear a listener set with
		* {@link #setRecoveryAvailableListener(RecoveryAvailableListener)}.
		*/
		public void clearRecoveryAvailableListener() {
		mHandler.post(() -> {
		mRecoveryAvailableListener = null;
		stopTrackingRecoveryAvailability();
		});
		}

		private boolean isApmEnabled() {
		return Settings.Global.getInt(mContext.getContentResolver(),
		Settings.Global.AIRPLANE_MODE_ON, 0) == 1;
		}

		private boolean isWifiEnabled() {
		// TODO: this doesn't consider the scan-only mode. I.e. WiFi is "disabled" while location
		// mode is enabled. Probably need to reset WiFi in that state as well. Though this may
		// appear strange to the user in that they've actually disabled WiFi.
		return mWifiManager != null && (mWifiManager.isWifiEnabled()
		\|\| mWifiManager.isWifiApEnabled());
		}

		/**
		* Provide an indication as to whether subsystem recovery is "available" - i.e. will be
		* executed if triggered via {@link #triggerSubsystemRestart(String, RecoveryStatusCallback)}.
		*
		* @return true if a subsystem recovery is available, false otherwise.
		*/
		public boolean isRecoveryAvailable() {
		if (!isApmEnabled()) return true;

		// even if APM is enabled we may still have recovery potential if WiFi is enabled
		return isWifiEnabled();
		}

		private void startTrackingRecoveryAvailability() {
		if (mApmMonitorRegistered) return;

		mContext.registerReceiver(mApmMonitor,
		new IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED), null, mHandler);
		mApmMonitorRegistered = true;
		}

		private void stopTrackingRecoveryAvailability() {
		if (!mApmMonitorRegistered) return;

		mContext.unregisterReceiver(mApmMonitor);
		mApmMonitorRegistered = false;
		}

		private void startTrackingWifiRestart() {
		IntentFilter filter = new IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION);
		filter.addAction(WifiManager.WIFI_AP_STATE_CHANGED_ACTION);
		mContext.registerReceiver(mWifiMonitor, filter, null, mHandler);
		}

		private void stopTrackingWifiRestart() {
		mContext.unregisterReceiver(mWifiMonitor);
		}

		private void startTrackingTelephonyRestart() {
		mTelephonyManager.registerPhoneStateListener(new HandlerExecutor(mHandler),
		mPhoneStateListener);
		}

		private void stopTrackingTelephonyRestart() {
		mTelephonyManager.unregisterPhoneStateListener(mPhoneStateListener);
		}

		private void checkIfAllSubsystemsRestartsAreDone() {
		if (!mWifiRestartInProgress && !mTelephonyRestartInProgress) {
		mCurrentRecoveryCallback.onSubsystemRestartOperationEnd();
		mCurrentRecoveryCallback = null;
		}
		}

		/**
		* Callbacks used with
		* {@link #triggerSubsystemRestart(String, RecoveryStatusCallback)} to get
		* information about when recovery starts and is completed.
		*/
		public interface RecoveryStatusCallback {
		/**
		* Callback for a subsystem restart triggered via
		* {@link #triggerSubsystemRestart(String, RecoveryStatusCallback)} - indicates
		* that operation has started.
		*/
		void onSubsystemRestartOperationBegin();

		/**
		* Callback for a subsystem restart triggered via
		* {@link #triggerSubsystemRestart(String, RecoveryStatusCallback)} - indicates
		* that operation has ended. Note that subsystems may still take some time to come up to
		* full functionality.
		*/
		void onSubsystemRestartOperationEnd();
		}

		/**
		* Trigger connectivity recovery for all requested technologies.
		*
		* @param reason An optional reason code to pass through to the technology-specific
		* API. May be used to trigger a bug report.
		* @param callback Callbacks triggered when recovery status changes.
		*/
		public void triggerSubsystemRestart(String reason, @NonNull RecoveryStatusCallback callback) {
		mHandler.post(() -> {
		boolean someSubsystemRestarted = false;

		if (mWifiRestartInProgress) {
		Log.e(TAG, "Wifi restart still in progress");
		return;
		}

		if (mTelephonyRestartInProgress) {
		Log.e(TAG, "Telephony restart still in progress");
		return;
		}

		if (isWifiEnabled()) {
		mWifiManager.restartWifiSubsystem(reason);
		mWifiRestartInProgress = true;
		someSubsystemRestarted = true;
		startTrackingWifiRestart();
		}

		if (mTelephonyManager != null && !isApmEnabled()) {
		if (mTelephonyManager.rebootRadio()) {
		mTelephonyRestartInProgress = true;
		someSubsystemRestarted = true;
		startTrackingTelephonyRestart();
		}
		}

		if (someSubsystemRestarted) {
		mCurrentRecoveryCallback = callback;
		callback.onSubsystemRestartOperationBegin();

		mHandler.postDelayed(() -> {
		stopTrackingWifiRestart();
		stopTrackingTelephonyRestart();
		mWifiRestartInProgress = false;
		mTelephonyRestartInProgress = false;
		mCurrentRecoveryCallback.onSubsystemRestartOperationEnd();
		mCurrentRecoveryCallback = null;
		}, RESTART_TIMEOUT_MS);
		}
		});
		}
		}