Android获取当前所在位置的WiFi热点，并保存到本地文件中

直接上源码了，如果有问题欢迎留言一起讨论。

</pre><pre name="code" class="java">1、以下是activity中的代码public class MainActivity extends Activity implements OnClickListener {private WifiManager wifiManager;private List<String> oldDatas;//存储的数据private List<ScanResult> listdatas2;//需要存储的数据private Button refresh_btn;//刷新按钮private ListView listView;private MyAdapter myadapter;private Button save_btn;//保存按钮@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);init();}private void init() {listView = (ListView) findViewById(R.id.show_wifi_list);refresh_btn = (Button) findViewById(R.id.refresh_btn);refresh_btn.setOnClickListener(this);save_btn = (Button) findViewById(R.id.save_btn);save_btn.setOnClickListener(this);myadapter = new MyAdapter(this);openWifi();List<ScanResult> listdatas1 = wifiManager.getScanResults();listView.setAdapter(myadapter);refreshList(listdatas1);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.refresh_btn:save_btn.setEnabled(true);List<ScanResult> lists1 = wifiManager.getScanResults();refreshList(lists1);break;case R.id.save_btn:if(wifiManager.getScanResults().size()>0){saveWifiHot();}else{Toast.makeText(getApplication(), "没有数据需要保存", 1).show();// 保存成功}break;default:break;}}/** * 刷新数据 * @param lists1 */private void refreshList(List<ScanResult> lists1){listdatas2 = new ArrayList<ScanResult>();String id = "";for (int i = 0; i < lists1.size(); i++) {//去掉相同ssid的if (!id.equals(lists1.get(i).SSID)&& !(lists1.get(i).SSID.equals(""))) {id = lists1.get(i).SSID;listdatas2.add(lists1.get(i));}}myadapter.setList(listdatas2);myadapter.notifyDataSetChanged();}/** * 保存到sdcard的wifihot文本中 */private void saveWifiHot() {try {if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {saveToSDCard("wifihot");// 保存数据到SDCardToast.makeText(getApplication(), "保存成功", 1).show();// 保存成功save_btn.setEnabled(false);} else {save_btn.setEnabled(true);Toast.makeText(getApplication(), "保存失败", 1).show();// 保存失败}} catch (Exception e) {save_btn.setEnabled(true);Toast.makeText(getApplication(), "保存失败", 1).show();e.printStackTrace();}}// 保存数据到SDCardpublic void saveToSDCard(String filename) throws Exception {// 得到文件对象,找到SDCard的路径// File file = new File("mnt/sdcard", filename);File file = new File(Environment.getExternalStorageDirectory(),filename);String shareData;//文件存在则读取文件中的数据，不存在则创建新的文件再写入数据if(file.exists()){oldDatas = readSDCardData(filename);}else{oldDatas=new ArrayList<String>();}for (int i = 0; i < listdatas2.size(); i++) {shareData = "wifiName:" + listdatas2.get(i).SSID;oldDatas.add(shareData);}// 得到文件输出流对象FileOutputStream outStream = new FileOutputStream(file);outStream.write(oldDatas.toString().getBytes());outStream.close();}// 读取SDCard文件中的数据public List<String> readSDCardData(String filename) throws IOException {File file = new File(Environment.getExternalStorageDirectory(),filename);List<String> oldDatas = new ArrayList<String>();FileInputStream in = new FileInputStream(file);byte[] a = new byte[in.available()];in.read(a);oldDatas.add((new String(a)).substring(1, (new String(a)).length()));in.close();//Toast.makeText(getApplication(), oldDatas.toString(), 1).show();return oldDatas;}/** * 打开WIFI */private void openWifi() {if (!wifiManager.isWifiEnabled()) {Toast.makeText(this, "正在为您打开Wifi！，请稍等！！！", Toast.LENGTH_LONG).show();wifiManager.setWifiEnabled(true);}}public class MyAdapter extends BaseAdapter {LayoutInflater inflater;List<ScanResult> list;public MyAdapter(Context context) {this.inflater = LayoutInflater.from(context);}public void setList(List<ScanResult> list) {this.list = list;}@Overridepublic int getCount() {return list == null ? 0 : list.size();}@Overridepublic Object getItem(int position) {return position;}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {// TODO Auto-generated method stubView view = null;view = inflater.inflate(R.layout.wifi_list_item, null);ScanResult scanResult = list.get(position);TextView textView = (TextView) view.findViewById(R.id.textView);textView.setText(scanResult.SSID);TextView signalStrenth = (TextView) view.findViewById(R.id.signal_strenth);signalStrenth.setText(String.valueOf(Math.abs(scanResult.level)));ImageView imageView = (ImageView) view.findViewById(R.id.imageView);return view;}}}

2、xml里面的代码

<LinearLayout 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:orientation="vertical"><Button android:id="@+id/refresh_btn"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:text="刷新"/><Button android:id="@+id/save_btn"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:text="保存"/>    <ListView        android:id="@+id/show_wifi_list"        android:layout_width="fill_parent"        android:layout_height="wrap_content"/></LinearLayout>

3、listview item中的代码

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <ImageView        android:id="@+id/imageView"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true"        android:src="@drawable/ic_launcher" />    <TextView        android:id="@+id/textView"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBottom="@+id/imageView"        android:layout_marginBottom="14dp"        android:layout_toRightOf="@+id/imageView"        android:text="TextView" />    <TextView        android:id="@+id/signal_strenth"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBaseline="@+id/textView"        android:layout_alignBottom="@+id/textView"        android:layout_alignParentRight="true"        android:text="TextView" /></RelativeLayout>