android wifi基本操作代碼

判斷當前網絡是否可用

//判斷當前網絡是否可用
        public boolean note_Intent(Context context) {  
            ConnectivityManager con = (ConnectivityManager) context  
                .getSystemService(Context.CONNECTIVITY_SERVICE);  
            NetworkInfo networkinfo = con.getActiveNetworkInfo();  
            if (networkinfo == null || !networkinfo.isAvailable()) {  
            // 當前網絡不可用   
                Toast.makeText(context.getApplicationContext(), "當前網絡不可用",  
                Toast.LENGTH_SHORT).show();  
                return false;  
            }  
            boolean wifi = con.getNetworkInfo(ConnectivityManager.TYPE_WIFI)  
                .isConnectedOrConnecting();  
            if (!wifi) { // 提示使用wifi   
                Toast.makeText(context.getApplicationContext(), "建議您使用WIFI以減少流量！",  
                Toast.LENGTH_SHORT).show();  
            }  
            return true;  
          
        }


跳轉到系統wifi設置接界面：
Intent localIntent = new Intent();
                              localIntent.setComponent( new ComponentName(
                                           "com.android.settings",
                                           "com.android.settings.wifi.WifiPickerActivity" ));
                              startActivityForResult(localIntent, 1);

先獲得可用對象  ：

wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
			wifiInfo = wifiManager.getConnectionInfo();

之後你就可以通過這兩個對象進行各種操作：

StringBuffer sb = new StringBuffer();
			sb.append("Wifi信息\n");
			sb.append("MAC地址：" + wifiInfo.getMacAddress() + "\n");
			sb.append("接入點的BSSID：" + wifiInfo.getBSSID() + "\n");
			sb.append("IP地址（int）：" + wifiInfo.getIpAddress() + "\n");
			sb.append("IP地址（Hex）："
					+ Integer.toHexString(wifiInfo.getIpAddress()) + "\n");
			getBSSID = wifiInfo.getBSSID();
			sb.append("IP地址：" + ipIntToString(wifiInfo.getIpAddress()) + "\n");
			sb.append("網絡ID：" + wifiInfo.getNetworkId() + "\n");
			sb.append("網絡名字：" + wifiInfo.getSSID() + "\n");
			sb.append("網絡的信號：" + wifiInfo.getRssi() + "\n");
			sb.append("網絡連接的速度：" + wifiInfo.getLinkSpeed() + "\n");
			sb.append("客戶端狀態的信息：" + wifiInfo.getSupplicantState() + "\n");
			sb.append("獲取一個wifi 接入點是否有效：" + wifiManager.getWifiState() + "\n");
			sb.append("判斷一個wifi 連接是否有效：" + wifiManager.isWifiEnabled() + "\n");
			sb.append("WiFi網絡是否連接成功：" + isWifiConnect() + "\n");

下面是自己寫的一個簡單類

package com.example.wifidemo;

import java.net.Inet4Address;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.ComponentName;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.net.wifi.WifiManager.WifiLock;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
	private WifiManager wifiManager;
	private WifiInfo wifiInfo;
	// 掃描出的網絡連接列表
	CheckBox checkbox;
	TextView textview;
	Button look;
	WifiLock mWifiLock;// 鎖住wifi表示不會斷開連接
	static String WifiBSSID = "38:22:d6:93:0e:a0";
	String getBSSID = "";

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		checkbox = (CheckBox) findViewById(R.id.checkbox);
		textview = (TextView) findViewById(R.id.textview);
		look = (Button) findViewById(R.id.look);
		new GetAsyncData().execute();
		look.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				new GetAsyncData().execute();
				switch (checkState()) {
				case 0:
					break;
				case 1:
					Toast.makeText(getApplicationContext(),
							"wifi網卡不可用，先打開Wifi", Toast.LENGTH_SHORT).show();

					break;
				case 2:
					break;
				case 3:
					if (getBSSID.equals(WifiBSSID)) {
						Toast.makeText(getApplicationContext(), "wifi配置正確",
								Toast.LENGTH_SHORT).show();
					} else {
						Toast.makeText(getApplicationContext(), "請連接到正確的網絡",
								Toast.LENGTH_SHORT).show();
						Intent localIntent = new Intent();
						localIntent
								.setComponent(new ComponentName(
										"com.android.settings",
										"com.android.settings.wifi.WifiPickerActivity"));
						startActivityForResult(localIntent, 1);
					}
					break;
				case 4:
					Toast.makeText(getApplicationContext(), "未知網卡狀態",
							Toast.LENGTH_SHORT).show();
					break;
				}
			}
		});
		checkbox.setOnCheckedChangeListener(new OnCheckedChangeListener() {

			@Override
			public void onCheckedChanged(CompoundButton buttonView,
					boolean isChecked) {
				if (isChecked) {
					wifiManager.setWifiEnabled(true);
					checkbox.setText("Wifi已開啓");
				} else {
					wifiManager.setWifiEnabled(false);
					checkbox.setText("Wifi已關閉");
				}
			}
		});
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		if (requestCode == 1) {
			new GetAsyncData().execute();
			if (getBSSID.equals(WifiBSSID)) {
				Toast.makeText(getApplicationContext(), "wifi配置正確",
						Toast.LENGTH_SHORT).show();
			} else {
				makeDialog();
			}
		}
		super.onActivityResult(requestCode, resultCode, data);
	}

	private void makeDialog() {
		new AlertDialog.Builder(MainActivity.this)
				.setTitle("提示")
				.setMessage("你還沒有連接到正確的網絡，是否要回到軟件頁面？")
				.setPositiveButton("確定", new DialogInterface.OnClickListener() {

					@Override
					public void onClick(DialogInterface dialog, int which) {
						Toast.makeText(getApplicationContext(), "沒有連接到正確的網絡",
								Toast.LENGTH_SHORT).show();
					}
				})
				.setNegativeButton("繼續配置",
						new DialogInterface.OnClickListener() {

							@Override
							public void onClick(DialogInterface dialog,
									int which) {
								Intent localIntent = new Intent();
								localIntent
										.setComponent(new ComponentName(
												"com.android.settings",
												"com.android.settings.wifi.WifiPickerActivity"));
								startActivityForResult(localIntent, 1);
							}
						}).create().show();
	}

	// 將int類型的IP轉換成字符串形式的IP
	private String ipIntToString(int ip) {
		try {
			byte[] bytes = new byte[4];
			bytes[0] = (byte) (0xff & ip);
			bytes[1] = (byte) ((0xff00 & ip) >> 8);
			bytes[2] = (byte) ((0xff0000 & ip) >> 16);
			bytes[3] = (byte) ((0xff000000 & ip) >> 24);
			return Inet4Address.getByAddress(bytes).getHostAddress();
		} catch (Exception e) {
			return "";
		}
	}

	public int checkState() {
		return wifiManager.getWifiState();
	}

	// 鎖定wifiLock
	public void acquireWifiLock() {
		mWifiLock.acquire();
	}

	// 解鎖wifiLock
	public void releaseWifiLock() {
		// 判斷是否鎖定
		if (mWifiLock.isHeld()) {
			mWifiLock.acquire();
		}
	}

	// 添加一個網絡並連接
	public void addNetWork(WifiConfiguration configuration) {
		int wcgId = wifiManager.addNetwork(configuration);
		wifiManager.enableNetwork(wcgId, true);
	}

	// 斷開指定ID的網絡
	public void disConnectionWifi(int netId) {
		wifiManager.disableNetwork(netId);
		wifiManager.disconnect();
	}

	public boolean isWifiConnect() {
		ConnectivityManager connManager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
		NetworkInfo mWifi = connManager
				.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
		return mWifi.isConnected();
	}

	class GetAsyncData extends AsyncTask<Void, Void, String> {

		@Override
		protected void onPostExecute(String result) {
			if (wifiManager.isWifiEnabled()) {
				checkbox.setText("Wifi已開啓");
				checkbox.setChecked(true);
			} else {
				checkbox.setText("Wifi已關閉");
				checkbox.setChecked(false);
			}
			textview.setText(result);
			super.onPostExecute(result);
		}

		@Override
		protected String doInBackground(Void... params) {
			wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
			wifiInfo = wifiManager.getConnectionInfo();
			StringBuffer sb = new StringBuffer();
			sb.append("Wifi信息\n");
			sb.append("MAC地址：" + wifiInfo.getMacAddress() + "\n");
			sb.append("接入點的BSSID：" + wifiInfo.getBSSID() + "\n");
			sb.append("IP地址（int）：" + wifiInfo.getIpAddress() + "\n");
			sb.append("IP地址（Hex）："
					+ Integer.toHexString(wifiInfo.getIpAddress()) + "\n");
			getBSSID = wifiInfo.getBSSID();
			sb.append("IP地址：" + ipIntToString(wifiInfo.getIpAddress()) + "\n");
			sb.append("網絡ID：" + wifiInfo.getNetworkId() + "\n");
			sb.append("網絡名字：" + wifiInfo.getSSID() + "\n");
			sb.append("網絡的信號：" + wifiInfo.getRssi() + "\n");
			sb.append("網絡連接的速度：" + wifiInfo.getLinkSpeed() + "\n");
			sb.append("客戶端狀態的信息：" + wifiInfo.getSupplicantState() + "\n");
			sb.append("獲取一個wifi 接入點是否有效：" + wifiManager.getWifiState() + "\n");
			sb.append("判斷一個wifi 連接是否有效：" + wifiManager.isWifiEnabled() + "\n");
			sb.append("WiFi網絡是否連接成功：" + isWifiConnect() + "\n");
			return sb.toString();
		}
	}
}