Follow Fang!: Android Scan AP

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.cy.getwifi"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="10"
        android:targetSdkVersion="18" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.cy.getwifi.GetWiFi"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Layout:

<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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".GetWiFi" >

    <ListView
        android:id="@+id/listView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true" >
    </ListView>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:text="Button" />

</RelativeLayout>

Code:

package com.cy.getwifi;

import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;

public class GetWiFi extends Activity {

 private ArrayAdapter<String> adapter;
 private Button button;
 private ListView listView;
 private WifiManager manager;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_get_wi_fi);
  init();
 }

 private void init() {
  button = (Button) findViewById(R.id.button1);
  listView = (ListView) findViewById(R.id.listView1);
  adapter = new ArrayAdapter<String>(this,
    android.R.layout.simple_list_item_1);
  manager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
  button.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    Boolean isEnable = manager.isWifiEnabled();
    if (isEnable == false)
     manager.setWifiEnabled(true);

    manager.startScan();

    if (adapter.getCount() > 0)
     adapter.clear();

    List<ScanResult> l = manager.getScanResults();
    for (ScanResult s : l) {
     adapter.add(s.SSID);
    }

    if (adapter.getCount() > 0)
     listView.setAdapter(adapter);

   }
  });
 }

}

參考資料：
http://developer.android.com/reference/android/net/wifi/WifiManager.html
http://developer.android.com/reference/android/net/wifi/WifiManager.html#startScan()
http://developer.android.com/reference/android/net/wifi/WifiManager.html#getScanResults()
http://developer.android.com/reference/android/net/wifi/WifiManager.html#setWifiEnabled(boolean)
http://developer.android.com/reference/android/net/wifi/ScanResult.html

2014/03/05

Android Scan AP