在Android中扫描wifi热点演示实例教程

转自:http://www.eoeandroid.com/viewthread.php?tid=386

1、首先新建了布局模板XML文件vifi.xml,代码很简单，如下：

    android:orientation="vertical"
    android:layout_
    android:layout_
    >
android:id="@+id/wifi"
    android:layout_ 
    android:layout_ 
    android:text="@string/hello"
    />

package com.archermind.wifi;

import java.util.List;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends Activity {
private TextView wifiText;
private WifiManager wifiManager;
private StringBuilder sb;
private List wifiList;
private WifiReceiver wifiReceiver;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

sb = new StringBuilder();
wifiText = (TextView) findViewById(R.id.wifi);
wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
wifiReceiver = new WifiReceiver();
registerReceiver(wifiReceiver, new IntentFilter(
WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
wifiManager.startScan();
wifiText.setText("\nStarting Scan\n");
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(0, 0, 0, "Refresh");
return super.onCreateOptionsMenu(menu);
}

@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
wifiManager.startScan();
wifiText.setText("Starting Scan");
return super.onMenuItemSelected(featureId, item);

}

@Override
protected void onPause() {
unregisterReceiver(wifiReceiver);
super.onPause();
}

@Override
protected void onResume() {
registerReceiver(wifiReceiver, new IntentFilter(
WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
super.onResume();
}

private final class WifiReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
sb = new StringBuilder();
wifiList = wifiManager.getScanResults();
for (int i = 0; i sb.append(new Integer(i + 1).toString() + ".");
sb.append((wifiList.get(i)).toString()).append("\n\n");
}
wifiText.setText(sb.toString());
}
}
}