Android連接指定的wifi熱點

讓Android連接指定wifi，需要添加如下權限

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>

熱點的加密方式不同，其接入的方式也不同，但均是通過WifiConfigration來配置的，分爲以下三種情況：

1、完全開放的網絡

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

2、WEP加密類型的網絡

conf.wepKeys[0] = psd;
                conf.wepTxKeyIndex = 0;
                conf.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
                conf.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);

3、WPA加密類型的網絡

conf.preSharedKey = psd;

明白原理後，寫一個Activity測試，代碼如下：

package test.wifi;

import android.content.Context;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;

import com.cxq.selftestdemo.R;

import java.util.List;

public class TestWifiActivity extends AppCompatActivity {

    private static final String TAG = "TestWifiActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test_wifi);
    }


    public void begin(View v) {

    }

    public void end(View v) {
        connectWifi(networkSSID, networkPass, WifiEncType.WPA);
    }

    String networkSSID = "cxq.ssid";
    String networkPass = "cxq.password";

    enum WifiEncType {
        WEP, WPA, OPEN
    }

    public void connectWifi(String targetSsid, String targetPsd, WifiEncType enc) {
        // 1、注意熱點和密碼均包含引號，此處需要需要轉義引號
        String ssid = "\"" + targetSsid + "\"";
        String psd = "\"" + targetPsd + "\"";

        //2、配置wifi信息
        WifiConfiguration conf = new WifiConfiguration();
        conf.SSID = ssid;
        switch (enc) {
            case WEP:
                // 加密類型爲WEP
                conf.wepKeys[0] = psd;
                conf.wepTxKeyIndex = 0;
                conf.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
                conf.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);
                break;
            case WPA:
                // 加密類型爲WPA
                conf.preSharedKey = psd;
                break;
            case OPEN:
                //開放網絡
                conf.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
        }

        //3、鏈接wifi
        WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
        wifiManager.addNetwork(conf);
        List<WifiConfiguration> list = wifiManager.getConfiguredNetworks();
        for (WifiConfiguration i : list) {
            if (i.SSID != null && i.SSID.equals(ssid)) {
                wifiManager.disconnect();
                wifiManager.enableNetwork(i.networkId, true);
                wifiManager.reconnect();
                break;
            }
        }
    }
}