Create a TetherEnabler class to manage tether settings switch
This class is created to manage the switch state of overall tethering state. It can turn on/off each type of tethering based on stored value in SharedPreference. Also, it listens to data saver state change. Bug: 145923107 Test: TetherEnablerTest Change-Id: I7f360329569f53f34cf13065aa0e00ad9b55f659
This commit is contained in:
Zhen Zhang
254
src/com/android/settings/network/TetherEnabler.java
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254
src/com/android/settings/network/TetherEnabler.java
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/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.settings.network;
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import static android.net.ConnectivityManager.TETHERING_BLUETOOTH;
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import static android.net.ConnectivityManager.TETHERING_USB;
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import static android.net.ConnectivityManager.TETHERING_WIFI;
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import android.bluetooth.BluetoothAdapter;
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import android.bluetooth.BluetoothPan;
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import android.content.BroadcastReceiver;
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import android.content.Context;
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import android.content.Intent;
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import android.content.IntentFilter;
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import android.content.SharedPreferences;
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import android.net.ConnectivityManager;
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import android.net.wifi.WifiManager;
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import android.os.Handler;
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import android.os.Looper;
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import android.text.TextUtils;
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import androidx.lifecycle.Lifecycle;
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import androidx.lifecycle.LifecycleObserver;
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import androidx.lifecycle.OnLifecycleEvent;
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import androidx.preference.PreferenceManager;
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import com.android.internal.annotations.VisibleForTesting;
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import com.android.settings.datausage.DataSaverBackend;
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import com.android.settings.widget.SwitchWidgetController;
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import java.util.ArrayList;
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import java.util.concurrent.atomic.AtomicReference;
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/**
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* TetherEnabler is a helper to manage Tethering switch on/off state. It turns on/off
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* different types of tethering based on stored values in {@link SharedPreferences} and ensures
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* tethering state updated by data saver state.
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*/
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public final class TetherEnabler implements SwitchWidgetController.OnSwitchChangeListener,
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DataSaverBackend.Listener, LifecycleObserver {
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@VisibleForTesting
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static final String WIFI_TETHER_KEY = "enable_wifi_tethering";
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@VisibleForTesting
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static final String USB_TETHER_KEY = "enable_usb_tethering";
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@VisibleForTesting
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static final String BLUETOOTH_TETHER_KEY = "enable_bluetooth_tethering";
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private final SwitchWidgetController mSwitchWidgetController;
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private final WifiManager mWifiManager;
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private final ConnectivityManager mConnectivityManager;
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private final DataSaverBackend mDataSaverBackend;
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private boolean mDataSaverEnabled;
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private final Context mContext;
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@VisibleForTesting
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final ConnectivityManager.OnStartTetheringCallback mOnStartTetheringCallback =
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new ConnectivityManager.OnStartTetheringCallback() {
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@Override
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public void onTetheringFailed() {
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super.onTetheringFailed();
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mSwitchWidgetController.setChecked(false);
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setSwitchWidgetEnabled(true);
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}
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};
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private final AtomicReference<BluetoothPan> mBluetoothPan;
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private final SharedPreferences mSharedPreferences;
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private boolean mBluetoothEnableForTether;
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private final BluetoothAdapter mBluetoothAdapter;
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TetherEnabler(Context context, SwitchWidgetController switchWidgetController,
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AtomicReference<BluetoothPan> bluetoothPan) {
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mContext = context;
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mSwitchWidgetController = switchWidgetController;
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mDataSaverBackend = new DataSaverBackend(context);
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mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(mContext);
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mConnectivityManager =
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(ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
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mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
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mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
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mBluetoothPan = bluetoothPan;
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mDataSaverEnabled = mDataSaverBackend.isDataSaverEnabled();
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}
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@OnLifecycleEvent(Lifecycle.Event.ON_START)
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public void onStart() {
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mDataSaverBackend.addListener(this);
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mSwitchWidgetController.setListener(this);
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mSwitchWidgetController.startListening();
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IntentFilter filter = new IntentFilter(ConnectivityManager.ACTION_TETHER_STATE_CHANGED);
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filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
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mContext.registerReceiver(mTetherChangeReceiver, filter);
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mSwitchWidgetController.setChecked(isTethering());
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setSwitchWidgetEnabled(true);
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}
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@OnLifecycleEvent(Lifecycle.Event.ON_STOP)
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public void onStop() {
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mDataSaverBackend.remListener(this);
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mSwitchWidgetController.stopListening();
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mContext.unregisterReceiver(mTetherChangeReceiver);
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}
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private void setSwitchWidgetEnabled(boolean enabled) {
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mSwitchWidgetController.setEnabled(enabled && !mDataSaverEnabled);
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}
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private boolean isTethering() {
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String[] tethered = mConnectivityManager.getTetheredIfaces();
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return isTethering(tethered);
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}
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private boolean isTethering(String[] tethered) {
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if (tethered != null && tethered.length != 0) {
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return true;
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}
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final BluetoothPan pan = mBluetoothPan.get();
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return pan != null && pan.isTetheringOn();
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}
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@Override
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public boolean onSwitchToggled(boolean isChecked) {
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if (isChecked) {
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startTether();
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} else {
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stopTether();
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}
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return true;
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}
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@VisibleForTesting
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void stopTether() {
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setSwitchWidgetEnabled(false);
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// Wi-Fi tether is selected by default
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if (mSharedPreferences.getBoolean(WIFI_TETHER_KEY, true)) {
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mConnectivityManager.stopTethering(TETHERING_WIFI);
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}
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// USB tether is not selected by default
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if (mSharedPreferences.getBoolean(USB_TETHER_KEY, false)) {
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mConnectivityManager.stopTethering(TETHERING_USB);
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}
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// Bluetooth tether is not selected by default
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if (mSharedPreferences.getBoolean(BLUETOOTH_TETHER_KEY, false)) {
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mConnectivityManager.stopTethering(TETHERING_BLUETOOTH);
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}
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}
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@VisibleForTesting
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void startTether() {
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setSwitchWidgetEnabled(false);
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// Wi-Fi tether is selected by default
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if (mSharedPreferences.getBoolean(WIFI_TETHER_KEY, true)) {
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startTethering(TETHERING_WIFI);
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}
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// USB tether is not selected by default
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if (mSharedPreferences.getBoolean(USB_TETHER_KEY, false)) {
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startTethering(TETHERING_USB);
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}
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// Bluetooth tether is not selected by default
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if (mSharedPreferences.getBoolean(BLUETOOTH_TETHER_KEY, false)) {
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startTethering(TETHERING_BLUETOOTH);
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}
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}
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@VisibleForTesting
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void startTethering(int choice) {
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if (choice == TETHERING_BLUETOOTH) {
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// Turn on Bluetooth first.
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if (mBluetoothAdapter.getState() == BluetoothAdapter.STATE_OFF) {
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mBluetoothEnableForTether = true;
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mBluetoothAdapter.enable();
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return;
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}
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} else if (choice == TETHERING_WIFI && mWifiManager.isWifiApEnabled()) {
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return;
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}
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mConnectivityManager.startTethering(choice, true /* showProvisioningUi */,
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mOnStartTetheringCallback, new Handler(Looper.getMainLooper()));
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}
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private final BroadcastReceiver mTetherChangeReceiver = new BroadcastReceiver() {
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@Override
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public void onReceive(Context context, Intent intent) {
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String action = intent.getAction();
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if (TextUtils.equals(ConnectivityManager.ACTION_TETHER_STATE_CHANGED, action)) {
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ArrayList<String> active = intent.getStringArrayListExtra(
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ConnectivityManager.EXTRA_ACTIVE_TETHER);
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mSwitchWidgetController.setChecked(
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isTethering(active.toArray(new String[active.size()])));
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setSwitchWidgetEnabled(true);
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} else if (TextUtils.equals(BluetoothAdapter.ACTION_STATE_CHANGED, action)) {
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if (mBluetoothEnableForTether) {
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switch (intent
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.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR)) {
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case BluetoothAdapter.STATE_ON:
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startTethering(TETHERING_BLUETOOTH);
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mBluetoothEnableForTether = false;
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break;
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case BluetoothAdapter.STATE_OFF:
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case BluetoothAdapter.ERROR:
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mBluetoothEnableForTether = false;
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break;
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default:
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// ignore transition states
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}
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}
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}
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}
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};
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@Override
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public void onDataSaverChanged(boolean isDataSaving) {
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mDataSaverEnabled = isDataSaving;
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setSwitchWidgetEnabled(!isDataSaving);
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}
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@Override
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public void onWhitelistStatusChanged(int uid, boolean isWhitelisted) {
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// we don't care, since we just want to read the value
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}
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@Override
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public void onBlacklistStatusChanged(int uid, boolean isBlacklisted) {
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// we don't care, since we just want to read the value
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}
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}
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