Android显示wifi信号强度以及周边信号的代码

先把activity_main.xml文件代码贴出来.TextView充满屏幕

    <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: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=".MainActivity" >                 <!--                 <TextView                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:background="@android:color/white" />         -->            <TextView                android:id="@+id/textView1"                android:layout_width="match_parent"                android:layout_height="match_parent"                android:gravity="center"                android:textColor="@android:color/black"                android:textSize="25sp" />                </LinearLayout>  

AndroidMenifest.xml中，加入两行，作用：获取权限

    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>        <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>  

最后是MainActivity.java中的程序：

    package com.example.wifistrength;                import java.util.List;                import android.net.wifi.ScanResult;        import android.net.wifi.WifiInfo;        import android.net.wifi.WifiManager;        import android.os.Bundle;        import android.app.Activity;        import android.content.Context;        import android.view.Menu;        import android.widget.TextView;        import android.widget.Toast;                public class MainActivity extends Activity {                        TextView tv;                    @Override            protected void onCreate(Bundle savedInstanceState) {                super.onCreate(savedInstanceState);                setContentView(R.layout.activity_main);                                String wserviceName = Context.WIFI_SERVICE;                WifiManager wm = (WifiManager) getSystemService(wserviceName);                                 WifiInfo info = wm.getConnectionInfo();                   int strength = info.getRssi();                int speed = info.getLinkSpeed();                  String units = WifiInfo.LINK_SPEED_UNITS;                  String ssid = info.getSSID();                                  tv  = (TextView) findViewById(R.id.textView1);                        List<ScanResult> results = wm.getScanResults();                String otherwifi = "The existing network is: \n\n";                                for (ScanResult result : results) {                      otherwifi += result.SSID  + ":" + result.level + "\n";                }                                String text = "We are connecting to " + ssid + " at " + String.valueOf(speed) + "   " + String.valueOf(units) + ". Strength : " + strength;                otherwifi += "\n\n";                otherwifi += text;                                tv.setText(otherwifi);                            }                            @Override            public boolean onCreateOptionsMenu(Menu menu) {                // Inflate the menu; this adds items to the action bar if it is present.                getMenuInflater().inflate(R.menu.main, menu);                return true;            }                    }  

结果图：


来自：http://blog.csdn.net/deng529828/article/details/10456417