android 7.1 上wifi 热点 上的接口变化

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 extends            ConnectivityManager.OnStartTetheringCallback {        final WeakReference<TetherSettings> mTetherSettings;        OnStartTetheringCallback(TetherSettings settings) {            mTetherSettings = new WeakReference<TetherSettings>(settings);        }        @Override        public void onTetheringStarted() {            update();        }        @Override        public 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);    }    @SystemApi    public void startTethering(int type, boolean showProvisioningUi,            final OnStartTetheringCallback callback, Handler handler) {        ResultReceiver wrappedCallback = new ResultReceiver(handler) {            @Override            protected 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);        }    }    @SystemApi    public 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 extends            ConnectivityManager.OnStartTetheringCallback {        final WeakReference<TetherSettings> mTetherSettings;        OnStartTetheringCallback(TetherSettings settings) {            mTetherSettings = new WeakReference<TetherSettings>(settings);        }        @Override        public void onTetheringStarted() {            update();        }        @Override        public 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

android 7.1 wifi热点Demo