Android wifi type,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 mTetherSettings;

OnStartTetheringCallback(TetherSettings settings) {

mTetherSettings = new WeakReference(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 mTetherSettings;

OnStartTetheringCallback(TetherSettings settings) {

mTetherSettings = new WeakReference(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

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