Android wifi 信号强度的显示以及周边信号的代码

先把activity_main.xml文件代码贴出来.TextView充满屏幕

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3. xmlns:tools="http://schemas.android.com/tools"
   
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5. android:layout_width="match_parent"
   
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7. android:layout_height="match_parent"
   
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9. android:paddingBottom="@dimen/activity_vertical_margin"
   
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11. android:paddingLeft="@dimen/activity_horizontal_margin"
    
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13. android:paddingRight="@dimen/activity_horizontal_margin"
    
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15. android:paddingTop="@dimen/activity_vertical_margin"
    
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17. tools:context=".MainActivity" >
    
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22. android:id="@+id/textView1"
    
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24. android:layout_width="match_parent"
    
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26. android:layout_height="match_parent"
    
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28. android:gravity="center"
    
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30. android:textColor="@android:color/black"
    
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32. android:textSize="25sp" />
    
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AndroidMenifest.xml中，加入两行，作用：获取权限

最后是MainActivity.java中的程序：
查看源码打印?

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2. package com.example.wifistrength;
   
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5. import java.util.List;
   
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8. import android.net.wifi.ScanResult;
   
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10. import android.net.wifi.WifiInfo;
    
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12. import android.net.wifi.WifiManager;
    
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14. import android.os.Bundle;
    
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16. import android.app.Activity;
    
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18. import android.content.Context;
    
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20. import android.view.Menu;
    
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22. import android.widget.TextView;
    
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24. import android.widget.Toast;
    
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27. public class MainActivity extends Activity {
    
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30. TextView tv;
    
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33. @Override
    
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35. protected void onCreate(Bundle savedInstanceState) {
    
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37. super.onCreate(savedInstanceState);
    
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39. setContentView(R.layout.activity_main);
    
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42. String wserviceName = Context.WIFI_SERVICE;
    
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44. WifiManager wm = (WifiManager) getSystemService(wserviceName);
    
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47. WifiInfo info = wm.getConnectionInfo();
    
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49. int strength = info.getRssi();
    
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51. int speed = info.getLinkSpeed();
    
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53. String units = WifiInfo.LINK_SPEED_UNITS;
    
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55. String ssid = info.getSSID();
    
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58. tv  = (TextView) findViewById(R.id.textView1);
    
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61. List results = wm.getScanResults();
    
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63. String otherwifi = "The existing network is: \n\n";
    
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66. for (ScanResult result : results) {
    
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68. otherwifi += result.SSID  + ":" + result.level + "\n";
    
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70. }
    
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73. String text = "We are connecting to " + ssid + " at " + String.valueOf(speed) + "   " + String.valueOf(units) + ". Strength : " + strength;
    
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75. otherwifi += "\n\n";
    
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77. otherwifi += text;
    
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80. tv.setText(otherwifi);
    
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83. }
    
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87. @Override
    
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89. public boolean onCreateOptionsMenu(Menu menu) {
    
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91. // Inflate the menu; this adds items to the action bar if it is present.
    
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93. getMenuInflater().inflate(R.menu.main, menu);
    
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95. return true;
    
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97. }
    
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100. }

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结果图：


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