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本文實例講述了Android編程實現wifi掃描及連接的方法。分享給大家供大家參考，具體如下：
主界面，搜索附近WIFI信息
/**
* Search WIFI and show in ListView
*
*/
public class MainActivity extends Activity implements OnClickListener,
OnItemClickListener {
private Button search_btn;
private ListView wifi_lv;
private WifiUtils mUtils;
private List<String> result;
private ProgressDialog progressdlg = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mUtils = new WifiUtils(this);
findViews();
setLiteners();
}
private void findViews() {
this.search_btn = (Button) findViewById(R.id.search_btn);
this.wifi_lv = (ListView) findViewById(R.id.wifi_lv);
}
private void setLiteners() {
search_btn.setOnClickListener(this);
wifi_lv.setOnItemClickListener(this);
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.search_btn) {
showDialog();
new MyAsyncTask().execute();
}
}
/**
* init dialog and show
*/
private void showDialog() {
progressdlg = new ProgressDialog(this);
progressdlg.setCanceledOnTouchOutside(false);
progressdlg.setCancelable(false);
progressdlg.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progressdlg.setMessage(getString(R.string.wait_moment));
progressdlg.show();
}
/**
* dismiss dialog
*/
private void progressDismiss() {
if (progressdlg != null) {
progressdlg.dismiss();
}
}
class MyAsyncTask extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... arg0) {
//掃描附近WIFI信息
result = mUtils.getScanWifiResult();
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
progressDismiss();
initListViewData();
}
}
private void initListViewData() {
if (null != result && result.size() > 0) {
wifi_lv.setAdapter(new ArrayAdapter<String>(
getApplicationContext(), R.layout.wifi_list_item,
R.id.ssid, result));
} else {
wifi_lv.setEmptyView(findViewById(R.layout.list_empty));
}
}
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
TextView tv = (TextView) arg1.findViewById(R.id.ssid);
if (!TextUtils.isEmpty(tv.getText().toString())) {
Intent in = new Intent(MainActivity.this, WifiConnectActivity.class);
in.putExtra("ssid", tv.getText().toString());
startActivity(in);
}
}
}
/**
* 連接指定的WIFI
*
*/
public class WifiConnectActivity extends Activity implements OnClickListener {
private Button connect_btn;
private TextView wifi_ssid_tv;
private EditText wifi_pwd_tv;
private WifiUtils mUtils;
// wifi之ssid
private String ssid;
private String pwd;
private ProgressDialog progressdlg = null;
@SuppressLint("HandlerLeak")
private Handler mHandler = new Handler() {
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case 0:
showToast("WIFI連接成功");
finish();
break;
case 1:
showToast("WIFI連接失敗");
break;
}
progressDismiss();
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_connect);
mUtils = new WifiUtils(this);
findViews();
setLiteners();
initDatas();
}
/**
* init dialog
*/
private void progressDialog() {
progressdlg = new ProgressDialog(this);
progressdlg.setCanceledOnTouchOutside(false);
progressdlg.setCancelable(false);
progressdlg.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progressdlg.setMessage(getString(R.string.wait_moment));
progressdlg.show();
}
/**
* dissmiss dialog
*/
private void progressDismiss() {
if (progressdlg != null) {
progressdlg.dismiss();
}
}
private void initDatas() {
ssid = getIntent().getStringExtra("ssid");
if (!TextUtils.isEmpty(ssid)) {
ssid = ssid.replace("\"", "");
}
this.wifi_ssid_tv.setText(ssid);
}
private void findViews() {
this.connect_btn = (Button) findViewById(R.id.connect_btn);
this.wifi_ssid_tv = (TextView) findViewById(R.id.wifi_ssid_tv);
this.wifi_pwd_tv = (EditText) findViewById(R.id.wifi_pwd_tv);
}
private void setLiteners() {
connect_btn.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.connect_btn) {// 下一步操作
pwd = wifi_pwd_tv.getText().toString();
// 判斷密碼輸入情況
if (TextUtils.isEmpty(pwd)) {
Toast.makeText(this, "請輸入wifi密碼", Toast.LENGTH_SHORT).show();
return;
}
progressDialog();
// 在子線程中處理各種業務
dealWithConnect(ssid, pwd);
}
}
private void dealWithConnect(final String ssid, final String pwd) {
new Thread(new Runnable() {
@Override
public void run() {
Looper.prepare();
// 檢驗密碼輸入是否正確
boolean pwdSucess = mUtils.connectWifiTest(ssid, pwd);
try {
Thread.sleep(4000);
} catch (Exception e) {
e.printStackTrace();
}
if (pwdSucess) {
mHandler.sendEmptyMessage(0);
} else {
mHandler.sendEmptyMessage(1);
}
}
}).start();
}
private void showToast(String str) {
Toast.makeText(WifiConnectActivity.this, str, Toast.LENGTH_SHORT).show();
}
}
工具類：
public class WifiUtils {
// 上下文Context對象
private Context mContext;
// WifiManager對象
private WifiManager mWifiManager;
public WifiUtils(Context mContext) {
this.mContext = mContext;
mWifiManager = (WifiManager) mContext
.getSystemService(Context.WIFI_SERVICE);
}
/**
* 判斷手機是否連接在Wifi上
*/
public boolean isConnectWifi() {
// 獲取ConnectivityManager對象
ConnectivityManager conMgr = (ConnectivityManager) mContext
.getSystemService(Context.CONNECTIVITY_SERVICE);
// 獲取NetworkInfo對象
NetworkInfo info = conMgr.getActiveNetworkInfo();
// 獲取連接的方式為wifi
State wifi = conMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI)
.getState();
if (info != null && info.isAvailable() && wifi == State.CONNECTED)
{
return true;
} else {
return false;
}
}
/**
* 獲取當前手機所連接的wifi信息
*/
public WifiInfo getCurrentWifiInfo() {
return mWifiManager.getConnectionInfo();
}
/**
* 添加一個網絡并連接 傳入參數：WIFI發生配置類WifiConfiguration
*/
public boolean addNetwork(WifiConfiguration wcg) {
int wcgID = mWifiManager.addNetwork(wcg);
return mWifiManager.enableNetwork(wcgID, true);
}
/**
* 搜索附近的熱點信息，并返回所有熱點為信息的SSID集合數據
*/
public List<String> getScanWifiResult() {
// 掃描的熱點數據
List<ScanResult> resultList;
// 開始掃描熱點
mWifiManager.startScan();
resultList = mWifiManager.getScanResults();
ArrayList<String> ssids = new ArrayList<String>();
if (resultList != null) {
for (ScanResult scan : resultList) {
ssids.add(scan.SSID);// 遍歷數據，取得ssid數據集
}
}
return ssids;
}
/**
* 連接wifi 參數：wifi的ssid及wifi的密碼
*/
public boolean connectWifiTest(final String ssid, final String pwd) {
boolean isSuccess = false;
boolean flag = false;
mWifiManager.disconnect();
boolean addSucess = addNetwork(CreateWifiInfo(ssid, pwd, 3));
if (addSucess) {
while (!flag && !isSuccess) {
try {
Thread.sleep(10000);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
String currSSID = getCurrentWifiInfo().getSSID();
if (currSSID != null)
currSSID = currSSID.replace("\"", "");
int currIp = getCurrentWifiInfo().getIpAddress();
if (currSSID != null && currSSID.equals(ssid) && currIp != 0) {
isSuccess = true;
} else {
flag = true;
}
}
}
return isSuccess;
}
/**
* 創建WifiConfiguration對象 分為三種情況：1沒有密碼;2用wep加密;3用wpa加密
*
* @param SSID
* @param Password
* @param Type
* @return
*/
public WifiConfiguration CreateWifiInfo(String SSID, String Password,
int Type) {
WifiConfiguration config = new WifiConfiguration();
config.allowedAuthAlgorithms.clear();
config.allowedGroupCiphers.clear();
config.allowedKeyManagement.clear();
config.allowedPairwiseCiphers.clear();
config.allowedProtocols.clear();
config.SSID = "\"" + SSID + "\"";
WifiConfiguration tempConfig = this.IsExsits(SSID);
if (tempConfig != null) {
mWifiManager.removeNetwork(tempConfig.networkId);
}
if (Type == 1) // WIFICIPHER_NOPASS
{
config.wepKeys[0] = "";
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
config.wepTxKeyIndex = 0;
}
if (Type == 2) // WIFICIPHER_WEP
{
config.hiddenSSID = true;
config.wepKeys[0] = "\"" + Password + "\"";
config.allowedAuthAlgorithms
.set(WifiConfiguration.AuthAlgorithm.SHARED);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);
config.allowedGroupCiphers
.set(WifiConfiguration.GroupCipher.WEP104);
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
config.wepTxKeyIndex = 0;
}
if (Type == 3) // WIFICIPHER_WPA
{
config.preSharedKey = "\"" + Password + "\"";
config.hiddenSSID = true;
config.allowedAuthAlgorithms
.set(WifiConfiguration.AuthAlgorithm.OPEN);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
config.allowedPairwiseCiphers
.set(WifiConfiguration.PairwiseCipher.TKIP);
// config.allowedProtocols.set(WifiConfiguration.Protocol.WPA);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
config.allowedPairwiseCiphers
.set(WifiConfiguration.PairwiseCipher.CCMP);
config.status = WifiConfiguration.Status.ENABLED;
}
return config;
}
private WifiConfiguration IsExsits(String SSID) {
List<WifiConfiguration> existingConfigs = mWifiManager
.getConfiguredNetworks();
for (WifiConfiguration existingConfig : existingConfigs) {
if (existingConfig.SSID.equals("\"" + SSID + "\"")) {
return existingConfig;
}
}
return null;
}
}
—–相關布局文件————–
主頁面
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<Button
android:id="@+id/search_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:text="搜索附近WIFI"
android:textSize="16sp" >
</Button>
<ListView
android:id="@+id/wifi_lv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/search_btn"
android:layout_marginTop="10dp"
android:divider="#d1d1d1"
android:dividerHeight="1px"
android:scrollbars="none" >
</ListView>
</RelativeLayout>
連接頁面
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/wifi_ssid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:padding="10dp"
android:text="@string/wifi_ssid"
android:textSize="16sp" />
<TextView
android:id="@+id/wifi_ssid_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:layout_toRightOf="@id/wifi_ssid"
android:padding="10dp"
android:textSize="16sp" />
<TextView
android:id="@+id/wifi_pwd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/wifi_ssid"
android:layout_marginTop="15dp"
android:padding="10dp"
android:text="@string/wifi_pwd"
android:textSize="16sp" />
<EditText
android:id="@+id/wifi_pwd_tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/wifi_ssid_tv"
android:layout_marginRight="15dp"
android:layout_marginTop="15dp"
android:layout_toRightOf="@id/wifi_pwd"
android:hint="@string/input_pwd_hint"
android:padding="10dp"
android:textSize="16sp" />
<Button
android:id="@+id/connect_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_margin="10dp"
android:text="連接WIFI"
android:textSize="16sp" >
</Button>
</RelativeLayout>
主頁面ListView的item
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="40dp"
android:background="#FFFFFF" >
<TextView
android:id="@+id/ssid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerInParent="true"
android:paddingLeft="15dp"
android:textColor="#333333"
android:textSize="16sp" />
</RelativeLayout>
主界面未搜索 到WIFI的展示
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFFFFF" >
<TextView
android:id="@+id/ssid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="附近暫時沒有WIFI"
android:textColor="#333333"
android:textSize="16sp" />
</RelativeLayout>
github上DEMO下載地址：https://github.com/ldm520/WIFI_TOOL
更多關于Android相關內容感興趣的讀者可查看本站專題：《Android通信方式總結》、《Android硬件相關操作與應用總結》、《Android資源操作技巧匯總》、《Android視圖View技巧總結》、《Android開發入門與進階教程》及《Android控件用法總結》
希望本文所述對大家Android程序設計有所幫助。
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