我试图在我的android应用程序中显示连接的wifi网络的信号强度。我试过以下方法:

//Receiver for information on the network info
private BroadcastReceiver mNetworkReceiver = new BroadcastReceiver()
{
    @Override
    public void onReceive(Context context, Intent intent)
    {
        Log.d("INFO", "onReceive()");
        List<ScanResult> scanResult = mWifi.getScanResults();
        for(ScanResult scan : scanResult)
        {
            Log.d("INFO","Network strength: " + String.valueOf(scan.level) + " dBm " + scan.SSID);
        }
    }
};

然后在onresume()/onpause()上注册/注销接收器:
@Override
public void onResume()
{
    super.onResume();
    mActivity.registerReceiver(mNetworkReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)); //network info
}

@Override
public void onPause()
{
    super.onPause();
    mActivity.unregisterReceiver(mNetworkReceiver);
}

但这似乎行不通。我还启用了ACCESS_WIFI_STATE权限。只有当我手动调用<WiFiManager>.startScan()时,才会调用我的接收器,但我正在尝试使它与广播接收器一起工作,以便每当信号强度发生变化时,我总能显示它。我注意到onReceive()提供了一个列表,如果我只需要连接的网络的统计信息,这个列表是不必要的。有什么办法可以改变吗?
编辑:还有,我知道这方面有一些相关的问题,但是我读过的那些问题并没有太大帮助。
编辑2:澄清了我的问题。主要问题是,除非我调用startScan(),否则永远不会调用我的接收器。

最佳答案

好吧,这段代码可以很好地与我一起使用toast来通知wifi信号强度,所以
我的接收器是这样的

@Override
  public void onReceive(Context context, Intent intent) {
    List<ScanResult> results = wifiDemo.wifi.getScanResults();
    ScanResult bestSignal = null;
    for (ScanResult result : results) {
      if (bestSignal == null
          || WifiManager.compareSignalLevel(bestSignal.level, result.level) < 0)
        bestSignal = result;
    }

    String message = String.format("%s networks found. %s is the strongest.",
        results.size(), bestSignal.SSID);
    Toast.makeText(context, message, Toast.LENGTH_LONG).show();

    Log.d("Debug", "onReceive() message: " + message);
  }

这是我的启动活动中注册接收器并在textview上获取wifi信息的内容
public class WiFiDemo extends Activity {

    WifiManager wifi;
    BroadcastReceiver receiver;

    TextView textStatus;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // Setup UI
        textStatus = (TextView) findViewById(R.id.textStatus);

        // Setup WiFi
        wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);

        // Get WiFi status
        WifiInfo info = wifi.getConnectionInfo();
        textStatus.append("\n\nWiFi Status: " + info.toString());

        // List available networks
        List<WifiConfiguration> configs = wifi.getConfiguredNetworks();
        for (WifiConfiguration config : configs) {
            textStatus.append("\n\n" + config.toString());
        }

        // Register Broadcast Receiver
        if (receiver == null)
            receiver = new WiFiScanReceiver(this);

        registerReceiver(receiver, new IntentFilter(
                WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
        Log.d(TAG, "onCreate()");
    }

    @Override
    public void onStop() {
        unregisterReceiver(receiver);
            super.onStop();
    }
    }

我在xml布局文件的textview上放置了scroll视图
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <ScrollView
        android:id="@+id/ScrollView01"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:id="@+id/textStatus"
            android:text="WiFi Connections :" />
    </ScrollView>

</LinearLayout>

最后我的清单是这样的
    <uses-sdk android:minSdkVersion="10" />
      <uses-permission android:name="android.permission.ACCESS_WIFI_STATE">
</uses-permission>
      <uses-permission android:name="android.permission.CHANGE_WIFI_STATE">
</uses-permission>

    <activity android:name=".WiFiDemo" android:label="@string/app_name">
          <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
          </intent-filter>
        </activity>

        <receiver android:name=".WiFiScanReceiver">
          <intent-filter>
            <action android:name="com.rdc" />
          </intent-filter>
        </receiver>

还是有麻烦告诉我!!

关于android - 获取连接网络的WiFi信号强度,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/11389492/

10-09 09:21