android显示wifi信号强度以及周边信号(源代码)

<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: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>

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

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;
}

}