Android:通过WifiManager监听Wifi信号强弱

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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"      android:layout_width="match_parent"      android:layout_height="match_parent" >        <ImageView          android:id="@+id/wifi_image"          android:layout_width="wrap_content"          android:layout_height="wrap_content"          android:layout_marginLeft="145dp"          android:layout_gravity="center" />    </LinearLayout>

用于获得信号强度并改变图片的Activity：MainActivity

package com.my.phonesingle;    import java.util.Timer;  import java.util.TimerTask;    import android.annotation.SuppressLint;  import android.app.Activity;  import android.net.wifi.WifiInfo;  import android.net.wifi.WifiManager;  import android.os.Bundle;  import android.os.Handler;  import android.os.Message;  import android.widget.ImageView;  import android.widget.Toast;    public class MainActivity extends Activity {      private WifiInfo wifiInfo = null;       //获得的Wifi信息      private WifiManager wifiManager = null; //Wifi管理器      private Handler handler;      private ImageView wifi_image;           //信号图片显示      private int level;                      //信号强度值        @SuppressLint("HandlerLeak")      @Override      public void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_main);          //图片控件初始化          wifi_image = (ImageView) findViewById(R.id.wifi_image);          // 获得WifiManager          wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);          // 使用定时器,每隔5秒获得一次信号强度值          Timer timer = new Timer();          timer.scheduleAtFixedRate(new TimerTask() {              @Override              public void run() {                  wifiInfo = wifiManager.getConnectionInfo();                  //获得信号强度值                  level = wifiInfo.getRssi();                  //根据获得的信号强度发送信息                  if (level <= 0 && level >= -50) {                      Message msg = new Message();                      msg.what = 1;                      handler.sendMessage(msg);                  } else if (level < -50 && level >= -70) {                      Message msg = new Message();                      msg.what = 2;                      handler.sendMessage(msg);                  } else if (level < -70 && level >= -80) {                      Message msg = new Message();                      msg.what = 3;                      handler.sendMessage(msg);                  } else if (level < -80 && level >= -100) {                      Message msg = new Message();                      msg.what = 4;                      handler.sendMessage(msg);                  } else {                      Message msg = new Message();                      msg.what = 5;                      handler.sendMessage(msg);                  }                }            }, 1000, 5000);          // 使用Handler实现UI线程与Timer线程之间的信息传递,每5秒告诉UI线程获得wifiInto          handler = new Handler() {                @Override              public void handleMessage(Message msg) {                  switch (msg.what) {                  // 如果收到正确的消息就获取WifiInfo，改变图片并显示信号强度                  case 1:                      wifi_image.setImageResource(R.drawable.single4);                      Toast.makeText(MainActivity.this,                              "信号强度：" + level + " 信号最好", Toast.LENGTH_SHORT)                              .show();                      break;                  case 2:                      wifi_image.setImageResource(R.drawable.single3);                      Toast.makeText(MainActivity.this,                              "信号强度：" + level + " 信号较好", Toast.LENGTH_SHORT)                              .show();                      break;                  case 3:                      wifi_image.setImageResource(R.drawable.single2);                      Toast.makeText(MainActivity.this,                              "信号强度：" + level + " 信号一般", Toast.LENGTH_SHORT)                              .show();                      break;                  case 4:                      wifi_image.setImageResource(R.drawable.single1);                      Toast.makeText(MainActivity.this,                              "信号强度：" + level + " 信号较差", Toast.LENGTH_SHORT)                              .show();                      break;                  case 5:                      wifi_image.setImageResource(R.drawable.single0);                      Toast.makeText(MainActivity.this,                              "信号强度：" + level + " 无信号", Toast.LENGTH_SHORT)                              .show();                      break;                  default:                      //以防万一                      wifi_image.setImageResource(R.drawable.single0);                      Toast.makeText(MainActivity.this, "无信号",                              Toast.LENGTH_SHORT).show();                  }              }            };        }  }

然后只需要打开Wifi测试一下，就行啦！

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