第一種

Intent intent = new Intent();
intent.setAction("android.net.wifi.PICK_WIFI_NETWORK");
startActivity(intent);

第二種

startActivity(new Intent(android.provider.Settings.ACTION_WIFI_SETTINGS));

第三種

Intent i = new Intent();
if(android.os.Build.VERSION.SDK_INT >= 11){
    
 
//Honeycomb
    i.setClassName("com.android.settings", "com.android.settings.Settings$WifiSettingsActivity");
 }else{
    //other versions
     i.setClassName("com.android.settings"
     , "com.android.settings.wifi.WifiSettings");
 }
 startActivity(i);

第四種

Intent wifiSettingsIntent = new
 
 Intent("android.settings.WIFI_SETTINGS");  
startActivity(wifiSettingsIntent);