如何获取可用的 wifi 网络并将它们显示在 android 的列表中 [英] How to get available wifi networks and display them in a list in android

问题描述

朋友们，我想找到所有可用的 WiFi 网络并将它们显示在我尝试过的列表中，如下所示.但它不起作用.我已经编辑了我的代码，现在我得到了结果，但所有的结果都是我不需要的.我只需要列表中的 wifi 网络名称.

Friends, I want to find all available WiFi networks and display them in a list I have tried as below. But it's not working. I have edited my code, and now I got the result but with all the result that I don't need. I only need names of wifi network in my list.

public class MainActivity extends Activity {

    TextView mainText;
    WifiManager mainWifi;
    WifiReceiver receiverWifi;
    List<ScanResult> wifiList;
    StringBuilder sb = new StringBuilder();

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mainText = (TextView) findViewById(R.id.tv1);
        mainWifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);

        if (mainWifi.isWifiEnabled() == false)
        {  
             // If wifi disabled then enable it
             Toast.makeText(getApplicationContext(), "wifi is disabled..making it enabled",
             Toast.LENGTH_LONG).show();
             mainWifi.setWifiEnabled(true);
         } 

         receiverWifi = new WifiReceiver();
         registerReceiver(receiverWifi, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
         mainWifi.startScan();
         mainText.setText("Starting Scan...");

     }

     public boolean onCreateOptionsMenu(Menu menu) {
            menu.add(0, 0, 0, "Refresh");
            return super.onCreateOptionsMenu(menu);
     }

     public boolean onMenuItemSelected(int featureId, MenuItem item) {
            mainWifi.startScan();
            mainText.setText("Starting Scan");
            return super.onMenuItemSelected(featureId, item);
     }

     protected void onPause() {
            unregisterReceiver(receiverWifi);
            super.onPause();
     }

     protected void onResume() {
            registerReceiver(receiverWifi, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
            super.onResume();
     }

        // Broadcast receiver class called its receive method
        // when number of wifi connections changed

      class WifiReceiver extends BroadcastReceiver {

            // This method call when number of wifi connections changed
            public void onReceive(Context c, Intent intent) {

                sb = new StringBuilder();
                wifiList = mainWifi.getScanResults();
                sb.append("
        Number Of Wifi connections :"+wifiList.size()+"

");

                for(int i = 0; i < wifiList.size(); i++){

                    sb.append(new Integer(i+1).toString() + ". ");
                    sb.append((wifiList.get(i)).toString());
                    sb.append("

");
                }

                mainText.setText(sb); 
            }

       }
}

推荐答案

需要创建一个BroadcastReceiver来监听Wifi扫描结果:

You need to create a BroadcastReceiver to listen for Wifi scan results:

private final BroadcastReceiver mWifiScanReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context c, Intent intent) {
        if (intent.getAction().equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {
            List<ScanResult> mScanResults = mWifiManager.getScanResults();
            // add your logic here
        }
    }
}

在 onCreate() 中，您将分配 mWifiManager 并启动扫描:

In onCreate() you would assign mWifiManager and initiate a scan:

mWifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
registerReceiver(mWifiScanReceiver,
        new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
mWifiManager.startScan();

getScanResults() 仅在您具有适当权限时才会返回数据.为此，请将以下两行之一添加到您的 AndroidManifest.xml:

getScanResults() will return data only if you have appropriate permissions. For this, add one of the following two lines to your AndroidManifest.xml:

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

另请注意，在 API 23+ 中，必须在运行时请求权限.(对于实验室环境，您也可以改为在设置"中手动授予权限——所需的编码较少，但不建议用于最终用户应用.)

Also note that in API 23+, permissions must be requested at runtime. (For a lab environment, you can also grant permissions manually in Settings instead—less coding required, but not recommended for an end-user app.)

请注意，每次有新的扫描结果可用时，处理扫描结果的代码都会运行，更新结果.

Note that the code which handles your scan results would run every time a new scan result is available, updating the result.

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