Setting学习笔记-Wifi/Bluetooth开关

mySelf
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1.WLAN

基础：

NetworkDashboardFragment.java => network_and_internet.xml

  • fragment : WifiSettings.java => WifiSettings2.java

  • controller :

     final WifiMasterSwitchPreferenceController wifiPreferenceController =
     new WifiMasterSwitchPreferenceController(context, metricsFeatureProvider);

WLAN开关

WifiMasterSwitchPreferenceController.java

[implements] LifecycleObserver | OnResume | OnPause | OnStart | OnStop

  • 创建 WifiEnabler 对象【很重要】

     mWifiEnabler = new WifiEnabler(
     mContext, 
     new MasterSwitchController(mWifiPreference),
     mMetricsFeatureProvider);

  • WifiEnabler.java

    • 包含 Switch开关 - SwitchWidgetController，可操控 isChecked | isEnabled

       mSwitchWidget.setListener(this); //注册回调，回调：onSwitchToggled()

    • onSwitchToggled() => 通过aidl，mWifiManager-开关Wifi

    • 注册广播接收器，收到 WifiManager.WIFI_STATE_CHANGED_ACTION 后，更新Switch状态

  • MasterSwitchController.java [extends SwitchWidgetController.java]

    WLAN开关-Switch具体对应的PreferenceController

    onPreferenceChange() => switch状态变化时，会回调 WifiEnabler的 onSwitchToggled (true|false)

     public MasterSwitchController(MasterSwitchPreference preference) {
     mPreference = preference;
 }

  • MasterSwitchPreference.java [extends RestrictedPreference.java]

    WLAN开关-Switch具体对应的Preference

    包含成员变量：Switch mSwitch

    注册switch 的点击事件，并最终调用到 onPreferenceChange()

WifiSettings2-开关

WifiSettings2 : WLAN开关Preference，点击后跳转的Fragment

创建 WifiEnabler 【包括 switch开关 逻辑】

 private WifiEnabler createWifiEnabler() {
 final SettingsActivity activity = (SettingsActivity) getActivity();
 return new WifiEnabler(
   activity, 
   new SwitchBarController(activity.getSwitchBar()),
   mMetricsFeatureProvider);
 }

 com.android.settings.widget 【包名,不是应用开发的 SwitchBar】
 SwitchBar | SwitchBarController

SwitchBar.java

开关对象，注册监听，开启/关闭 swtich时，更新背景(绿/灰)

setTextViewLabelAndBackground() 【更新背景】

onCheckedChanged()

=> 回调 SwitchBarController的 onSwitchChanged()

=> 回调 mListener的 onSwitchToggled() 【WifiEnabler::onSwitchToggled()】

SwitchBarController.java [ extends SwitchWidgetController.java ]

  • 生命周期 startListening() => 注册回调接口

     mSwitchBar.addOnSwitchChangeListener(this);

  • onSwitchChanged() => 回调 mListener的 onSwitchToggled() 【注册回调和WLAN开关一样，在WifiEnabler中】

WifiSettings2-list展示

WifiSettings2.java

两个回调方法：

  • onWifiStateChanged()
  • onWifiEntriesChanged()

onWifiEntriesChanged() => updateWifiEntryPreferencesDelayed() 【显示进度条，异步执行Runnable任务】

=> 异步任务:【 updateWifiEntryPreferences() 】

已连接网络： mConnectedWifiEntryPreferenceCategory

  • 点击事件: launchNetworkDetailsFragment ( pref )
  • 跳转 WifiNetworkDetailsFragment2.java

WifiEntries： mWifiEntryPreferenceCategory

  • 点击事件: connect() => ConfigureWifiEntryFragment.java => WifiConfigController2.java
  • 触发 onWifiEntriesChanged() ，从而更新两个 PreferenceCategory

添加网络Pref点击事件： launchAddNetworkFragment()

wifi列表每个项:

  • ConnectedWifiEntryPreference.java
  • LongPressWifiEntryPreference.java
  • WifiEntryPreference.java

2.已连接设备

connected_devices.xml

其他设备-USB

调用关系：

 // ConnectedDeviceDashboardFragment.java
 use(ConnectedDeviceGroupController.class).init(this);
 ​
 ​
 // ConnectedDeviceGroupController.java
 // init()方法：创建一系列Updater对象(new)：
 ConnectedBluetoothDeviceUpdater | ConnectedUsbDeviceUpdater | connectedDockUpdater
 // displayPreference()方法：
 mConnectedUsbDeviceUpdater.initUsbPreference(context); //创建Preference【usb连接的Preference】
 //onStart()|onStop()中,注册|注销 BroadcastReceiver
 ​
 ​
 // ConnectedUsbDeviceUpdater.java
 // 构造方法
 ConnectedUsbDeviceUpdater(Context context, DashboardFragment fragment,
                  DevicePreferenceCallback devicePreferenceCallback, UsbBackend usbBackend) {
 mFragment = fragment; // ConnectedDeviceDashboardFragment
 mDevicePreferenceCallback = devicePreferenceCallback; //传入ConnectedDeviceGroupController，其实现了该接口
 mUsbBackend = usbBackend;
 mUsbReceiver = new UsbConnectionBroadcastReceiver(context,
                                              mUsbConnectionListener, mUsbBackend);
 mMetricsFeatureProvider = FeatureFactory.getFactory(mFragment.getContext())
 .getMetricsFeatureProvider();
 }
 // initUsbPreference()方法，创建Preference
 //点击事件：跳转 UsbDetailsFragment
 new SubSettingLauncher(mFragment.getContext())
 .setDestination(UsbDetailsFragment.class.getName())
 .setTitleRes(R.string.device_details_title)
 .setSourceMetricsCategory(mFragment.getMetricsCategory())
 .launch();
 ​
 //////////////////////////
 UsbDetailsFragment extends DashboardFragment{} // USB偏好设置页
 /*【重要】*/UsbConnectionBroadcastReceiver extends BroadcastReceiver implements LifecycleObserver,OnResume,OnPause{}
 ​
 // UsbDetailsFragment中 使用 UsbConnectionBroadcastReceiver：
 this.getSettingsLifecycle().addObserver(mUsbReceiver);
 // 未使用过：疑问点
 import com.android.settingslib.core.lifecycle.LifecycleObserver;
 import com.android.settingslib.core.lifecycle.events.OnPause;
 import com.android.settingslib.core.lifecycle.events.OnResume;

 // USB 的用途 : 文件传输|USB网络共享|不进行数据传输...
 // UsbDetailsFragment.java : createControllerList()【赋值给成员变量：mControllers】
 //mControllers: USB受控于: | USB的用途 ...[PreferenceCategory]
 new UsbDetailsFunctionsController(context, fragment, usbBackend);
 ​
 /*【重要】*/ UsbDetailsFunctionsController extends UsbDetailsController implements RadioButtonPreference.OnClickListener{}

UsbDetailsFunctionsController.java

  • 创建 RadioButtonPreference :

    UsbDetailsFunctionsController.java :

    • 成员变量 FUNCTIONS_MAP : Map<Long,Integer> 【五个键值对，UsbManager.FUNCTION_NONE ...】
    • refresh() =调用=> getProfilePreference() 【创建Preference，并add进 mProfilesContainer】

    UsbDetailsFragment.java：

    • 成员变量 mUsbConnectionListener：UsbConnectionBroadcastReceiver.UsbConnectionListener
    • UsbConnectionListener 回调方法：onUsbConnectionChanged()；会调用controller.refresh() 【mControllers里取值】

    UsbConnectionBroadcastReceiver.java：

    • 收到广播后，调用

       mUsbConnectionListener.onUsbConnectionChanged(
     mConnected, mFunctions, mPowerRole,mDataRole);

  • RadioButtonPreference 点击事件

    UsbDetailsFunctionsController.java :: onRadioButtonClicked()

    mUsbBackend对象：setCurrentFunctions() | getCurrentFunctions()

     mUsbManager.setCurrentFunctions(functions);
 mUsbManager.getCurrentFunctions();

UsbManager::setCurrentFunctions() ==具体实现==> UsbService::setCurrentFunctions()

=> UsbDeviceManager::setCurrentFunctions() 【mHandler.sendMessage(MSG_SET_CURRENT_FUNCTIONS, functions);】

=> UsbDeviceManager::setEnabledFunctions(functions, false);

=> setUsbConfig()

=> setCurrentUsbFunctionsCb() 【内部类UsbGadgetCallback 的方法】

=> updateUsbStateBroadcastIfNeeded(functions);【发送广播 action: UsbManager.ACTION_USB_STATE】

config:

  • 文件传输 【5
  • USB网络共享 【33
  • MIDI 【9
  • PTP 【17
  • 仅充电(不进行数据传输) 【1

//疑问：如何导入的类？

import android.hardware.usb.gadget.V1_0.IUsbGadget; import android.hardware.usb.gadget.V1_0.IUsbGadgetCallback;

新设备配对-蓝牙

 <com.android.settingslib.RestrictedPreference
  android:key="add_bt_devices"
  android:title="@string/bluetooth_pairing_pref_title"
  android:fragment="com.android.settings.bluetooth.BluetoothPairingDetail"
  settings:controller="com.android.settings.connecteddevice.AddDevicePreferenceController"/>

BluetoothPairingDetail

设备名称：BluetoothDeviceRenamePreferenceController.java 【onAttach() 中声明】

footer: mFooterPreference

可用的设备：BluetoothProgressCategory mAvailableDevicesCategory;

  • 生命周期：onAttach() => onActivityCreated() => onStart()

    onStart() => updateBluetooth() => updateContent()

    => enableScanning() =...=> startScanning()

     //开始扫描-停止扫描
 void startScanning() {
  if (!mBluetoothAdapter.isDiscovering()) {
      mBluetoothAdapter.startDiscovery();
  }
 }
 void stopScanning() {
  if (mBluetoothAdapter.isDiscovering()) {
      mBluetoothAdapter.cancelDiscovery();
  }
 }

  • 搜索到的蓝牙设备：

    搜索到蓝牙：发送广播android.bluetooth.device.action.FOUND

    BluetoothEventManager.java

    【 内部类：BluetoothBroadcastReceiver】

    • 收到广播，进行处理【handler.onReceive(context, intent, device);】
    • intent中 保存有 BluetoothDevice对象(device)

    【内部类：DeviceFoundHandler implements Handler】

    • onReceive()方法中，创建 CachedBluetoothDevice 对象

      cachedDevice = mDeviceManager.addDevice(device);

    CachedBluetoothDeviceManager.java【mDeviceManager::addDevice()】

     // BluetoothDevice:搜索到的蓝牙设备，表示新蓝牙设备
 // CachedBluetoothDevice:平板已经缓存过的蓝牙设备
 public CachedBluetoothDevice addDevice(BluetoothDevice device) {
  CachedBluetoothDevice newDevice;
  final LocalBluetoothProfileManager profileManager = mBtManager.getProfileManager();
  synchronized (this) {
      newDevice = findDevice(device);  
      //如果新设备已经是缓存过的蓝牙设备,返回null;
      //否则添加进mCachedDevices列表
      if (newDevice == null) {
          newDevice = new CachedBluetoothDevice(mContext, profileManager, device);
          mHearingAidDeviceManager.initHearingAidDeviceIfNeeded(newDevice);
          if (!mHearingAidDeviceManager.setSubDeviceIfNeeded(newDevice)) {
              mCachedDevices.add(newDevice);
              mBtManager.getEventManager().dispatchDeviceAdded(newDevice);
          }
      }
  }
  return newDevice;
 }

    关键方法：mBtManager.getEventManager().dispatchDeviceAdded(newDevice);

    调用回到 BluetoothEventManager::dispatchDeviceAdded()

     void dispatchDeviceAdded(CachedBluetoothDevice cachedDevice) {
  for (BluetoothCallback callback : mCallbacks) {
      callback.onDeviceAdded(cachedDevice);
  }
 }
 //callback对象：BluetoothDeviceUpdater

    DeviceListPreferenceFragment::onDeviceAdded()

     public void onDeviceAdded(CachedBluetoothDevice cachedDevice) {
     ...
     if (mFilter.matches(cachedDevice.getDevice())) {
         createDevicePreference(cachedDevice);
     }
 }

  • BluetoothPairingDetail.java 的onStart() 【注册callback对象[回调方法]】

     //父类： DeviceListPreferenceFragment.java
 @Override
 public void onStart() {
     super.onStart();
     if (mLocalManager == null || isUiRestricted()) return;
 ​
     mLocalManager.setForegroundActivity(getActivity());
     mLocalManager.getEventManager().registerCallback(this);
 }
 // mLocalManager.getEventManager() 即获取 BluetoothEventManager对象
 // registerCallback(this): BluetoothEventManager的mCallbacks列表添加元素
 // 最终调用自己的 onDeviceAdded() 方法

  • 点击事件：DeviceListPreferenceFragment::onPreferenceTreeClick()

     => onDevicePreferenceClick(btPreference);
 => btPreference.onClicked();
 ​
 //BluetoothDevicePreference.java

image-20230626113053306.png

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