先把activity_main.xml文件代码贴出来.TextView充满屏幕
[html] view plain copy
- <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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- <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：[java] view plain copy
- 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：
