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[操作系统]androd 获得wifi列表


AndroidManifest.

<??><manifest ="http://schemas.android.com/apk/res/android"  package="com.example.yanlei.wifi" >  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />  <!-- 在SDCard中创建与删除文件权限 -->  <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>  <!-- 连接<a href="http://www.it165.net/news/nhlw/" target="_blank" >互联网</a>Internet权限 -->  <uses-permission android:name="android.permission.INTERNET" />  <!-- GPS定位权限 -->  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />  <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />  <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />  <uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />  <uses-permission android:name="android.permission.INTERNET" />  <application    android:allowBackup="true"    android:icon="@mipmap/ic_launcher"    android:label="@string/app_name"    android:theme="@style/AppTheme" >    <activity      android:name=".MainActivity"      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>

activity_main.

<RelativeLayout ="http://schemas.android.com/apk/res/android"  ="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=".WifiListActivity" >  <ListView    android:id="@+id/listView"    android:layout_width="match_parent"    android:layout_height="wrap_content" >  </ListView></RelativeLayout> 

item_wifi_list.

<??><RelativeLayout ="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent" >  <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>

MainActivity.java

package com.example.yanlei.wifi;import android.content.Context;import android.net.wifi.ScanResult;import android.net.wifi.WifiManager;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;import java.util.List;public class MainActivity extends AppCompatActivity {  private WifiManager wifiManager;  List<ScanResult> list;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    init();  }  private void init() {    wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);    openWifi();    list = wifiManager.getScanResults();    ListView listView = (ListView) findViewById(R.id.listView);    if (list == null) {      Toast.makeText(this, "wifi未打开!", Toast.LENGTH_LONG).show();    }else {      listView.setAdapter(new MyAdapter(this,list));    }  }  /**   * 打开WIFI   */  private void openWifi() {    if (!wifiManager.isWifiEnabled()) {      wifiManager.setWifiEnabled(true);    }  }  public class MyAdapter extends BaseAdapter {    LayoutInflater inflater;    List<ScanResult> list;    public MyAdapter(Context context, List<ScanResult> list) {      // TODO Auto-generated constructor stub      this.inflater = LayoutInflater.from(context);      this.list = list;    }    @Override    public int getCount() {      // TODO Auto-generated method stub      return list.size();    }    @Override    public Object getItem(int position) {      // TODO Auto-generated method stub      return position;    }    @Override    public long getItemId(int position) {      // TODO Auto-generated method stub      return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {      // TODO Auto-generated method stub      View view = null;      view = inflater.inflate(R.layout.item_wifi_list, 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);      //判断信号强度,显示对应的指示图标      if (Math.abs(scanResult.level) > 100) {        imageView.setImageDrawable(getResources().getDrawable(R.drawable.a0));      } else if (Math.abs(scanResult.level) > 80) {        imageView.setImageDrawable(getResources().getDrawable(R.drawable.a1));      } else if (Math.abs(scanResult.level) > 70) {        imageView.setImageDrawable(getResources().getDrawable(R.drawable.a0));      } else if (Math.abs(scanResult.level) > 60) {        imageView.setImageDrawable(getResources().getDrawable(R.drawable.a1));      } else if (Math.abs(scanResult.level) > 50) {        imageView.setImageDrawable(getResources().getDrawable(R.drawable.a0));      } else {        imageView.setImageDrawable(getResources().getDrawable(R.drawable.a1));      }      return view;    }  }  @Override  public boolean onCreateOptionsMenu(Menu menu) {    // Inflate the menu; this adds items to the action bar if it is present.    getMenuInflater().inflate(R.menu.menu_main, menu);    return true;  }  @Override  public boolean onOptionsItemSelected(MenuItem item) {    // Handle action bar item clicks here. The action bar will    // automatically handle clicks on the Home/Up button, so long    // as you specify a parent activity in AndroidManifest.    int id = item.getItemId();    //noinspection SimplifiableIfStatement    if (id == R.id.action_settings) {      return true;    }    return super.onOptionsItemSelected(item);  }}

来自:android wifi讲解 wifi列表显示