在之前的博客文章中,我寫了點在 Android 6 系統中連接到指定名稱的 Wifi 的體驗.然而,在 Android 7 中,有一些東西又變化了.另外就是在那篇文章中我說要提供代碼,結果拖到這篇文章,也沒有提供.那么,請忽略那篇文章,來看看這篇吧.
不變
首先聊下 Android 6 到 Android 7之間沒有變化的一些東西.想要讓設備連接到指定名稱的熱點,那么一定要經歷以下的幾個過程:
- 打開 Wifi
- 包裝出
WifiConfiguration對象 - 用
WifiConfiguration對象獲得 WifiManager 對象中 WifiConfiguration 的 index - 用 enableNetwork 連接網絡
- 使用完畢,斷開網絡然后刪除創建出的配置文件
- 關閉 Wifi
變
- 在 Android 6 中,如果系統中已經存在了其他的 app 或者是由系統生成的熱點信息,那么它將會返回 -1,而在 Android 7上並不是這個設定,是直接返回 index 的值
- 在 Android 7 中,無法使用 removeNetwork 這個公開的方法刪除一個已有的配置,雖然在刪除后,在系統中顯示已經被刪除,但是當重新關閉再打開 Wifi 開關時,會發現被刪除的配置由系統進行創建.這里,需要使用系統的隱藏方法
forget進行刪除
以上就是所有信息了.以下是代碼:
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("正在打開 Wifi,請稍等");
} else {
mTextViewShowResult.setText("打開 Wifi 失敗,Wifi 已經開啟?");
}
break;
case R.id.btnCloseWifi:
if (closeWifi()) {
mTextViewShowResult.setText("正在關閉 Wifi,請稍等");
} else {
mTextViewShowResult.setText("關閉 Wifi 失敗,Wifi 已經關閉?");
}
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;
// 無密碼
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: 找到對應的 ssid,編號為:" + networkId);
break;
}
}
}
if (networkId != -10) {
Log.i(TAG, "delWifiItem: 執行刪除指定網絡的過程");
wifiManager.removeNetwork(networkId);
result = true;
}
wifiConfigurations = wifiManager.getConfiguredNetworks();
for (WifiConfiguration wifiConfiguration : wifiConfigurations) {
if (wifiConfiguration.SSID.equals("\"" + ssid + "\"")) {
Log.i(TAG, "delWifiItem: 又找到對應的 ssid,編號為:" + 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>