android 7.1 上wifi 热点上的接口变化

在android 7.1 之前设置wifi ap方法如下:

WifiManager mWifiManager = (WifiManager)mContext.getSystemService(Context.WIFI_SERVICE);
mWifiManager.setWifiApEnabled(null, true)

android 7.1后 api 发生了变化用 setWifiApEnabled打开会导致连接热点失败,通过在 android 原生setting 查看源码发现 7.1后改用

import static android.net.ConnectivityManager.TETHERING_WIFI;private Handler mHandler = new Handler();
private OnStartTetheringCallback mStartTetheringCallback;...................mStartTetheringCallback = new OnStartTetheringCallback(this);
ConnectivityManager mCm = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);mCm.startTethering(TETHERING_WIFI, true, mStartTetheringCallback, mHandler);private static final class OnStartTetheringCallback extendsConnectivityManager.OnStartTetheringCallback {final WeakReference<TetherSettings> mTetherSettings;OnStartTetheringCallback(TetherSettings settings) {mTetherSettings = new WeakReference<TetherSettings>(settings);}@Overridepublic void onTetheringStarted() {update();}@Overridepublic void onTetheringFailed() {update();}private void update() {TetherSettings settings = mTetherSettings.get();if (settings != null) {settings.updateState();}}}

这里7.1采用ConnectivityManager类的 startTethering方法我们看下framework源码里面 startTethering原型

    @SystemApi  public void startTethering(int type, boolean showProvisioningUi,final OnStartTetheringCallback callback) {startTethering(type, showProvisioningUi, callback, null);}@SystemApipublic void startTethering(int type, boolean showProvisioningUi,final OnStartTetheringCallback callback, Handler handler) {ResultReceiver wrappedCallback = new ResultReceiver(handler) {@Overrideprotected void onReceiveResult(int resultCode, Bundle resultData) {if (resultCode == TETHER_ERROR_NO_ERROR) {callback.onTetheringStarted();} else {callback.onTetheringFailed();}}};try {mService.startTethering(type, wrappedCallback, showProvisioningUi);} catch (RemoteException e) {Log.e(TAG, "Exception trying to start tethering.", e);wrappedCallback.send(TETHER_ERROR_SERVICE_UNAVAIL, null);}}@SystemApipublic void stopTethering(int type) {try {mService.stopTethering(type);} catch (RemoteException e) {throw e.rethrowFromSystemServer();}}

startTethering方法参数官方具体解释如下:
/**
* Runs tether provisioning for the given type if needed and then starts tethering if
* the check succeeds. If no carrier provisioning is required for tethering, tethering is
* enabled immediately. If provisioning fails, tethering will not be enabled. It also
* schedules tether provisioning re-checks if appropriate.
*
* @param type The type of tethering to start. Must be one of
* {@link ConnectivityManager.TETHERING_WIFI},
* {@link ConnectivityManager.TETHERING_USB}, or
* {@link ConnectivityManager.TETHERING_BLUETOOTH}.
* @param showProvisioningUi a boolean indicating to show the provisioning app UI if there
* is one. This should be true the first time this function is called and also any time
* the user can see this UI. It gives users information from their carrier about the
* check failing and how they can sign up for tethering if possible.
* @param callback an {@link OnStartTetheringCallback} which will be called to notify the caller
* of the result of trying to tether.
* @param handler {@link Handler} to specify the thread upon which the callback will be invoked.
* @hide

我们代开wifi 热点用 ConnectivityManager.TETHERING_WIFI
显示UI更新 ,这里用到 ConnectivityManager.OnStartTetheringCallback
由于这是一个静态的类,我们可以用过弱引用找到父类的一些方法和 Context等
来更新打开热点的结果

      private static final class OnStartTetheringCallback extendsConnectivityManager.OnStartTetheringCallback {final WeakReference<TetherSettings> mTetherSettings;OnStartTetheringCallback(TetherSettings settings) {mTetherSettings = new WeakReference<TetherSettings>(settings);}@Overridepublic void onTetheringStarted() {update();}@Overridepublic void onTetheringFailed() {update();}private void update() {TetherSettings settings = mTetherSettings.get();//**通过get方法找到父类的引用 并调用方法**if (settings != null) {settings.updateState();}}}

最后在 7.1上面通过修改setWifiApEnabled方法并成功连接到wifi ap 上网

PS: android7.1 startTethering方法是系统api 只能在系统源码里面编译自己做了个jar包以及导入的方法还有demo apk 方便使用eclipse 的童鞋使用

注意:很多童鞋反应没有作用,请 ps | grep com.example.wifiap7 看下uid是否为 system , 7.1权限更严格.必须是system用户才能控制wifi热点,附件里面提供的platform签名文件为android原生的,其他厂家可能自己有改