Android 7.1.1 又出幺蛾子了 —— 再谈 Android 上的 Wifi 连接

2023-02-23 20:45:11

在之前的博客文章中,我写了点在 Android 6 系统中连接到指定名称的 Wifi 的体验.然而,在 Android 7 中,有一些东西又变化了.另外就是在那篇文章中我说要提供代码,结果拖到这篇文章,也没有提供.那么,请忽略那篇文章,来看看这篇吧.

不变

首先聊下 Android 6 到 Android 7之间没有变化的一些东西.想要让设备连接到指定名称的热点,那么一定要经历以下的几个过程:

打开 Wifi
包装出 WifiConfiguration 对象
用 WifiConfiguration 对象获得 WifiManager 对象中 WifiConfiguration 的 index
用 enableNetwork 连接网络
使用完毕,断开网络然后删除创建出的配置文件
关闭 Wifi

变

在 Android 6 中,如果系统中已经存在了其他的 app 或者是由系统生成的热点信息,那么它将会返回 -1,而在 Android 7上并不是这个设定,是直接返回 index 的值
在 Android 7 中,无法使用 removeNetwork 这个公开的方法删除一个已有的配置,虽然在删除后,在系统中显示已经被删除,但是当重新关闭再打开 Wifi 开关时,会发现被删除的配置由系统进行创建.这里,需要使用系统的隐藏方法 forget 进行删除

以上就是所有信息了.以下是代码:

package com.xxxxxxxx.wifitest7;

import android.content.Context;

import android.net.wifi.WifiConfiguration;

import android.net.wifi.WifiManager;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.text.TextUtils;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

import java.util.List;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private static final String TAG = "MainActivity";

    private final static String WIFI_SSID = "TP-LINK_ACA6";

    private Button mBtnOpenWifi;

    private Button mBtnCloseWifi;

    private Button mBtnAddWifi;

    private Button mBtnDelWifi;

    private Button mBtnConnect;

    private Button mBtnDisConnect;

    private TextView mTextViewShowResult;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        initUi();

    }

    private void initUi() {

        mBtnOpenWifi = (Button) findViewById(R.id.btnOpenWifi);

        mBtnOpenWifi.setOnClickListener(this);

        mBtnCloseWifi = (Button) findViewById(R.id.btnCloseWifi);

        mBtnCloseWifi.setOnClickListener(this);

        mBtnAddWifi = (Button) findViewById(R.id.btnAddWifi);

        mBtnAddWifi.setOnClickListener(this);

        mBtnDelWifi = (Button) findViewById(R.id.btnDelWifi) ;

        mBtnDelWifi.setOnClickListener(this);

        mBtnConnect = (Button) findViewById(R.id.btnConnect);

        mBtnConnect.setOnClickListener(this);

        mBtnDisConnect = (Button) findViewById(R.id.btnDisConnect);

        mBtnDisConnect.setOnClickListener(this);

        mTextViewShowResult = (TextView) findViewById(R.id.textViewShowResult);

    }

    @Override

    public void onClick(View view) {

        WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);

        mTextViewShowResult.setText("");

        // "TP-LINK_ACA6"

        switch (view.getId()) {

            case R.id.btnOpenWifi:

                if (openWifi()) {

                    mTextViewShowResult.setText("正在打开 Wifi,请稍等");

                } else {

                    mTextViewShowResult.setText("打开 Wifi 失败,Wifi 已经开启?");

                }

                break;

            case R.id.btnCloseWifi:

                if (closeWifi()) {

                    mTextViewShowResult.setText("正在关闭 Wifi,请稍等");

                } else {

                    mTextViewShowResult.setText("关闭 Wifi 失败,Wifi 已经关闭?");

                }

                break;

            case R.id.btnAddWifi:

                int networkId = addWifiItem(WIFI_SSID);

                mTextViewShowResult.setText("得到的 Wifi 的 ID 是:" + networkId);

                break;

            case R.id.btnDelWifi:

                forgetConfiguration(this,createWifiConfiguration(WIFI_SSID));

                break;

            case R.id.btnConnect:

                connectToSpecSsid(addWifiItem(WIFI_SSID));

                break;

            case R.id.btnDisConnect:

                disableSpecSsid(addWifiItem(WIFI_SSID));

                break;

        }

    }

    public static WifiConfiguration createWifiConfiguration(String SSID) {

        WifiConfiguration wifiConfiguration = new WifiConfiguration();

        wifiConfiguration.allowedKeyManagement.clear();

        wifiConfiguration.allowedAuthAlgorithms.clear();

        wifiConfiguration.hiddenSSID = true;

        // 无密码

        wifiConfiguration.SSID = "\"" + SSID + "\"";

        wifiConfiguration.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);

        return wifiConfiguration;

    }

    private boolean openWifi() {

        WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);

        boolean result = false;

        switch (wifiManager.getWifiState()) {

            case WifiManager.WIFI_STATE_DISABLED:

            case WifiManager.WIFI_STATE_DISABLING:

                wifiManager.setWifiEnabled(true);

                result = true;

                break;

            case WifiManager.WIFI_STATE_ENABLED:

            case WifiManager.WIFI_STATE_ENABLING:

                result = false;

                break;

        }

        return result;

    }

    private boolean closeWifi() {

        WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);

        boolean result = false;

        switch (wifiManager.getWifiState()) {

            case WifiManager.WIFI_STATE_ENABLED:

            case WifiManager.WIFI_STATE_ENABLING:

                wifiManager.setWifiEnabled(false);

                result = true;

                break;

            case WifiManager.WIFI_STATE_DISABLED:

            case WifiManager.WIFI_STATE_DISABLING:

                result = false;

                break;

        }

        return result;

    }

    private int addWifiItem (String ssid) {

        WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);

        List<WifiConfiguration> wifiConfigurations = wifiManager.getConfiguredNetworks();

        int networkId = -10;

        if (null != wifiConfigurations) {

            for (WifiConfiguration wifiConfiguration : wifiConfigurations) {

                if (wifiConfiguration.SSID.equals("\"" + ssid + "\"")) {

                    networkId = wifiConfiguration.networkId;

                    break;

                }

            }

        }

        if (networkId == -10) {

            networkId = wifiManager.addNetwork(createWifiConfiguration(ssid));

        }

        return networkId;

    }

    private boolean delWifiItem (String ssid) {

        WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);

        List<WifiConfiguration> wifiConfigurations = wifiManager.getConfiguredNetworks();

        boolean result = false;

        int networkId = -10;

        if (null != wifiConfigurations) {

            for (WifiConfiguration wifiConfiguration : wifiConfigurations) {

                if (wifiConfiguration.SSID.equals("\"" + ssid + "\"")) {

                    networkId = wifiConfiguration.networkId;

                    Log.i(TAG, "delWifiItem: 找到对应的 ssid,编号为:" + networkId);

                    break;

                }

            }

        }

        if (networkId != -10) {

            Log.i(TAG, "delWifiItem: 执行删除指定网络的过程");

            wifiManager.removeNetwork(networkId);

            result = true;

        }

        wifiConfigurations = wifiManager.getConfiguredNetworks();

        for (WifiConfiguration wifiConfiguration : wifiConfigurations) {

            if (wifiConfiguration.SSID.equals("\"" + ssid + "\"")) {

                Log.i(TAG, "delWifiItem: 又找到对应的 ssid,编号为:" + networkId);

                result = false;

                break;

            }

        }

        return result;

    }

    private boolean connectToSpecSsid(int netId) {

        WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);

        return wifiManager.enableNetwork(netId,true);

    }

    private boolean disableSpecSsid(int netId) {

        WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);

        return wifiManager.disableNetwork(netId);

    }

    public static void forgetConfiguration(Context context, WifiConfiguration config) {

        if (config == null) {

            return;

        }

        WifiManager wifiMan = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);

        List<WifiConfiguration> configuredNetworks = wifiMan.getConfiguredNetworks();

        if (configuredNetworks == null) {

            Log.e(TAG, "failed to get configured networks");

            return;

        }

        for (WifiConfiguration wc : configuredNetworks) {

            if (wc != null && wc.SSID != null && TextUtils.equals(wc.SSID, config.SSID)) {

                wifiMan.forget(wc.networkId, null);

                Log.d(TAG, "forgot network config: " + wc.toString());

                break;

            }

        }

    }

}

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout

    xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context="com.xxxxxx.wifitest7.MainActivity">

    <Button

        android:id="@+id/btnOpenWifi"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginStart="32dp"

        android:layout_marginTop="32dp"

        android:text="@string/open_wifi"

        app:layout_constraintLeft_toLeftOf="parent"

        app:layout_constraintTop_toTopOf="parent"

        />

    <Button

        android:id="@+id/btnCloseWifi"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginEnd="32dp"

        android:layout_marginTop="32dp"

        android:text="@string/close_wifi"

        app:layout_constraintRight_toRightOf="parent"

        app:layout_constraintTop_toTopOf="parent"

        />

    <TextView

        android:id="@+id/textViewShowResult"

        android:layout_width="321dp"

        android:layout_height="220dp"

        android:layout_marginLeft="16dp"

        android:layout_marginRight="16dp"

        android:layout_marginTop="16dp"

        app:layout_constraintLeft_toLeftOf="@+id/btnOpenWifi"

        app:layout_constraintRight_toRightOf="@+id/btnCloseWifi"

        app:layout_constraintTop_toBottomOf="@+id/btnConnect"

        app:layout_constraintHorizontal_bias="0.484"/>

    <Button

        android:id="@+id/btnConnect"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginStart="32dp"

        android:layout_marginTop="8dp"

        android:text="@string/connect"

        app:layout_constraintLeft_toLeftOf="parent"

        app:layout_constraintTop_toBottomOf="@+id/btnAddWifi"/>

    <Button

        android:id="@+id/btnDisConnect"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginEnd="32dp"

        android:layout_marginTop="8dp"

        android:text="@string/disconnect"

        app:layout_constraintRight_toRightOf="parent"

        app:layout_constraintTop_toBottomOf="@+id/btnDelWifi"/>

    <Button

        android:id="@+id/btnAddWifi"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginTop="8dp"

        android:text="@string/addwifi"

        app:layout_constraintTop_toBottomOf="@+id/btnOpenWifi"

        android:layout_marginStart="32dp"

        app:layout_constraintLeft_toLeftOf="parent"/>

    <Button

        android:id="@+id/btnDelWifi"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginTop="8dp"

        android:text="@string/delwifi"

        app:layout_constraintTop_toBottomOf="@+id/btnCloseWifi"

        android:layout_marginEnd="32dp"

        app:layout_constraintRight_toRightOf="parent"/>

</android.support.constraint.ConstraintLayout>

码农公寓

不变

变

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