检测wifi信号强度的android源代码

package com.mingrisoft.wifidemo; import java.util.Timer; import java.util.TimerTask; import android.annotation.SuppressLint; 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 android.app.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 //得到的值是一个0到-100的区间值，是一个int型数据，其中0到-50表示信号最好， // -50到-70表示信号偏差，小于-70表示最差，有可能连接不上或者掉线。 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.setBackgroundResource(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.setBackgroundResource(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.setBackgroundResource(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.setBackgroundResource(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.setBackgroundResource(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.setBackgroundResource(R.drawable.single0); Toast.makeText(MainActivity.this, "无信号", Toast.LENGTH_SHORT).show(); break; } } }; } }