Android显示wifi信号强度以及周边信号的代码

crespo09

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



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<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



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1 2	<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：



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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：