Android WiFi开发(WiFi编程)实例演示
Android SDK 提供了 WIFI 开发的相关 API,被保存在 android.net.wifi 和 android.net.wifi.p2p 包下。借助于 Android SDK 提供的相关开发类,可以方便地在 Android 系统的手机上开发基于 WIFI 的应用程序。
实例 WIFIDemo 演示了使用 WIFI 进行连接设备搜索并获取相应信息的过程,运行效果如图 1 所示。
图 1 WIFIDemo 运行结果
实例 WIFIDemo 中所使用的布局文件 main.xml 的内容如下:
实例 WIFIDemo 演示了使用 WIFI 进行连接设备搜索并获取相应信息的过程,运行效果如图 1 所示。
图 1 WIFIDemo 运行结果
实例 WIFIDemo 中所使用的布局文件 main.xml 的内容如下:
<?xml version="1.0" encoding="utf-8"?> <ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/mScrollView" android:layout_width="fill_parent" android:layout_height="wrap_content" android:scrollbars="vertical"> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical"> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:id="@+id/open_bt" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="打开wifi" /> <Button android:id="@+id/close_bt" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="关闭wifi" /> <Button android:id="@+id/check_bt" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="检查wifi" /> <Button android:id="@+id/search_bt" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="扫描wifi" /> </LinearLayout> <TextView android:id="@+id/text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="null" /> </LinearLayout> </ScrollView>实例 WIFIDemo 中 AndroidManifest.xml 文件的代码如下:
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="introduction.android.wifidemo"> <uses-sdk android:minSdkVersion="10" /> <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" /> <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>实例 WIFIDemo 中主 Activity 文件 MainActivity.java 的代码如下:
package introduction.android.wifidemo; import java.util.List; import android.R.string; import android.app.Activity; import android.content.Context; import android.net.wifi.ScanResult; import android.net.wifi.WifiInfo; import android.net.wifi.WifiManager; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ScrollView; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends Activity { private Button open_bt, close_bt, check_bt, search_bt; private TextView textView; private WifiManager wifiManager; private WifiInfo wifiInfo; private ScrollView scrollView; private List WifiConfiguration; private ScanResult scanResult; private List<ScanResult> WifiList; private StringBuffer stringBuffer = new StringBuffer(); /** * Called when the activity is first created. */ public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); scrollView = (ScrollView) findViewById(R.id.mScrollView); open_bt = (Button) findViewById(R.id.open_bt); close_bt = (Button) findViewById(R.id.close_bt); check_bt = (Button) findViewById(R.id.check_bt); search_bt = (Button) findViewById(R.id.search_bt); textView = (TextView) findViewById(R.id.text); open_bt.setOnClickListener(new open_btListener()); close_bt.setOnClickListener(new close_btListener()); check_bt.setOnClickListener(new check_btListener()); search_bt.setOnClickListener(new search_btListener()); } class search_btListener implements OnClickListener { public void onClick(View v) { // TODO Auto-generated method stub wifiManager.startScan(); WifiList = wifiManager.getScanResults(); wifiInfo = wifiManager.getConnectionInfo(); if (stringBuffer != null) { stringBuffer = new StringBuffer(); } stringBuffer = stringBuffer.append("Wifi名").append(" ").append("Wifi地址").append(" ") .append("Wifi频率").append("").append("Wifi信号") .append("\n"); if (WifiList != null) { for (int i = 0; i < WifiList.size(); i++) { scanResult = WifiList.get(i); stringBuffer = stringBuffer.append(scanResult.SSID).append(" ") .append(scanResult.BSSID).append(" ") .append(scanResult.frequency).append(" ") .append(scanResult.level).append("\n"); textView.setText(stringBuffer.toString()); } stringBuffer = stringBuffer.append ("-----------------------------------------------").append("\n"); textView.setText(stringBuffer.toString()); stringBuffer = stringBuffer.append("当前Wifi—BSSID").append(":").append(wifiInfo.getBSSID()).append("\n") .append("当前wifi—HiddenSSID").append(": ").append(wifiInfo.getHiddenSSID()).append("\n") .append("当前Wifi—IpAddress").append(": ").append(wifiInfo.getIpAddress()).append("\n") .append("当前Wifi—LinkSpeed").append(": ").append(wifiInfo.getLinkSpeed()).append("\n") .append("当前Wifi—MacAddress").append(": ").append(wifiInfo.getMacAddress()).append("\n") .append("当前Wifi—Network ID").append(": ").append(wifiInfo.getNetworkId()).append("\n") .append("当前Wifi—RSSI").append(": ").append(wifiInfo.getRssi()).append("\n") .append("当前Wifi—SSID").append(": ").append(wifiInfo.getSSID()).append("\n") .append("-----------------------------------------------").append("\n") .append("全部打印出关于本机Wifi信息").append(": ").append (wifiInfo.toString()); textView.setText(stringBuffer.toString()); } //stringBuffer=stringBuffer.append("-----------------------------------------------").append("\n"); //textView.setText() } } class check_btListener implements OnClickListener { public void onClick(View v) { // TODO Auto-generated method stub wifiManager = (WifiManager) MainActivity.this .getSystemService(Context.WIFI_SERVICE); System.out.println(wifiManager.getWifiState()); Toast.makeText(MainActivity.this, "当前网卡状态为:" + change(), Toast.LENGTH_SHORT) .show(); } } class close_btListener implements OnClickListener { public void onClick(View v) { // TODO Auto-generated method stub wifiManager = (WifiManager) MainActivity.this .getSystemService(Context.WIFI_SERVICE); wifiManager.setWifiEnabled(false); System.out.println(wifiManager.getWifiState()); Toast.makeText(MainActivity.this, "当前网卡状态为" + change(), Toast.LENGTH_SHORT) .show(); } } class open_btListener implements OnClickListener { public void onClick(View v) { // TODO Auto-generated method stub wifiManager = (WifiManager) MainActivity.this.getSystemService(Context.WIFI_SERVICE); wifiManager.setWifiEnabled(true); System.out.println(wifiManager.getWifiState()); Toast.makeText(MainActivity.this, "当前网卡状态为" + change(), Toast.LENGTH_SHORT) .show(); } } public String change() { String temp = null; switch (wifiManager.getWifiState()) { case 0: temp = "wifi正在关闭ING"; break; case 1: temp = "wifi已经关闭"; break; case 2: temp = "wifi正在打开ING"; break; case 3: temp = "wifi已经打开"; break; default: break; } return temp; } }
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