无法收听 android wi-fi 管理器的状态? [英] Unable to listen to android wi-fi manager's state?

问题描述

我在使用 BroadCast 接收器检查 Wi-Fi 状态时遇到了一些问题.你能帮忙吗?

I am having some trouble with BroadCast receiver for checking the Wi-fi state. Could you please help?

这是我的清单文件.

<uses-permission android:name="android.permission.READ_PHONE_STATE"> </uses-permission>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"> </uses-permission>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"> </uses-permission>
<uses-permission android:name="android.permission.INTERNET"> </uses-permission>
<application 
        android:icon="@drawable/icon" 
        android:label="@string/app_name">
    <activity 
        android:name=".MainActivity"
            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=".MainActivity">
<intent-filter android:name="android.net.wifi.WIFI_STATE_CHANGED"/>
       </receiver>  
   </application>
</manifest>

这是 MainActivity.java

And this is the MainActivity.java

public class MainActivity extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        int state = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, -1);
        String msg = null;
        switch (state) {
        case WifiManager.WIFI_STATE_DISABLED:
            msg = "it is disabled";
            break;
        case WifiManager.WIFI_STATE_ENABLED:
            msg = "it is enabled";
            break;
        case WifiManager.WIFI_STATE_DISABLING:
            msg = "it is switching off";
            break;
        case WifiManager.WIFI_STATE_ENABLING:
            msg = "wifi is getting enabled";
            break;
        default:
            msg = "not working properly";
            break;
        }
        if (msg != null) {
            Log.d("************%%%%%%%%wifi state ", "WIFI" + msg);
            Toast.makeText(context, "Wifi state is" + msg, Toast.LENGTH_LONG)
                    .show();
        }
    }
}

我不确定我在哪里犯了错误.任何输入将不胜感激.
我没有收到任何错误，只是日志文件没有显示所需的消息.

I am unsure where am I making my mistake. Any input would be appreciated.
I am not getting any errors just that the log file doesn't show the required message.

推荐答案

你还没有为意图过滤器添加参数，最终清单应该是这样的

You have had not added the parameters for the intent filter, the final manifest should look like this

<uses-permission android:name="android.permission.READ_PHONE_STATE"> </uses-permission>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"> </uses-permission>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"> </uses-permission>
<uses-permission android:name="android.permission.INTERNET"> </uses-permission>
<application 
            android:icon="@drawable/icon" 
            android:label="@string/app_name">
<activity 
            android:name=".MainActivity"
            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=".MainActivity">
    <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" /> 
            <action android:name="android.net.wifi.WIFI_STATE_CHANGED"/>
    </intent-filter>
    </receiver>
</application>

希望这会有所帮助.

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