android Wifi 控制

android 当中 wifi 控制非常简单。

在android 系统当中 wifi 有五种状态：

// Wi-Fi AP is currently being disabled. The state will change to
public static final int WIFI_AP_STATE_DISABLING = 0;
// Wi-Fi AP is disabled.
public static final int WIFI_AP_STATE_DISABLED = 1;
// Wi-Fi AP is currently being enabled. The state will change to
public static final int WIFI_AP_STATE_ENABLING = 2;
// Wi-Fi AP is enabled.
public static final int WIFI_AP_STATE_ENABLED = 3;
// Wi-Fi AP is in a failed state. This state will occur when an error occurs during
public static final int WIFI_AP_STATE_FAILED = 4;

可以通过系统调用去改变其状态进而控制wifi

实例效果如下：点击按钮来改变 wifi 状态，并用 Toast 打印出当前的 wifi 状态

代码如下

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <Button        android:id="@+id/openWIFI"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="openWIFI" />    <Button        android:id="@+id/closeWIFI"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="closeWIFI" />    <Button        android:id="@+id/checkState"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="checkState" /></LinearLayout>

wifiActivity.java

package cie.WIFI;import cie.WIFI.R;import android.app.Activity;import android.content.Context;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.Toast;public class WIFIActivity extends Activity {    /** Called when the activity is first created. */private Button startButton = null;private Button stopButton = null;private Button checkButton = null;private WifiManager wifiManager = null;@Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                startButton = (Button)findViewById(R.id.openWIFI);        stopButton = (Button)findViewById(R.id.closeWIFI);        checkButton = (Button)findViewById(R.id.checkState);                startButton.setOnClickListener(new StartWifiListener());        stopButton.setOnClickListener(new StopWifiListener());        checkButton.setOnClickListener(new CheckWifiListener());    }class StartWifiListener implements OnClickListener{@Overridepublic void onClick(View v) {// TODO Auto-generated method stubwifiManager = (WifiManager)WIFIActivity.this.getSystemService(Context.WIFI_SERVICE);wifiManager.setWifiEnabled(true);System.out.println("wifi state ----" + wifiManager.getWifiState());Toast toast = Toast.makeText(WIFIActivity.this, "当前网卡状态为"+wifiManager.getWifiState(), Toast.LENGTH_LONG);toast.show();}}class StopWifiListener implements OnClickListener{@Overridepublic void onClick(View v) {// TODO Auto-generated method stubwifiManager = (WifiManager)WIFIActivity.this.getSystemService(Context.WIFI_SERVICE);wifiManager.setWifiEnabled(false);System.out.println("wifi state ----" + wifiManager.getWifiState());Toast toast = Toast.makeText(WIFIActivity.this, "当前网卡状态为"+wifiManager.getWifiState(), Toast.LENGTH_LONG);toast.show();}}class CheckWifiListener implements OnClickListener{@Overridepublic void onClick(View v) {// TODO Auto-generated method stubwifiManager = (WifiManager)WIFIActivity.this.getSystemService(Context.WIFI_SERVICE);System.out.println("wifi state ----" + wifiManager.getWifiState());Toast toast = Toast.makeText(WIFIActivity.this, "当前网卡状态为"+wifiManager.getWifiState(), Toast.LENGTH_LONG);toast.show();}}}

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