Android displays code for WiFi signal strength and peripheral signals

First put the Activity_main.xml file code out. TextView Full Screen

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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, add two lines, function: Get permission

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

Finally, the program in Mainactivity.java:

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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;     }       }

Result diagram:

Android displays code for WiFi signal strength and peripheral signals