为什么我的 BroadcastReceiver On Wifi 更改时有多个状态更改

Question

我想检测 wifi on/off 变化。我下面的代码工作正常，但我经历了广播接收器的几次迭代。例如，如果我在设置中打开 wifi，我将获得 8 倍的 false 和 2 倍的 true 作为布尔值。正常吗？

public class MainActivity extends AppCompatActivity {
TextView wifistate = null;

BroadcastReceiver broadcastReceiver;
WifiManager wifi;
Context context;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    context = getApplicationContext();

    wifistate = (TextView) findViewById(R.id.wifistate);
    wifi = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);

    BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();

            if (action.equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)) {
                NetworkInfo info = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
                boolean connected = info.isConnected();
                if (connected) {
                    Log.i("RCVR", "True");
                    wifistate.setText("Connected");
                } else {
                    Log.i("RCVR", "False");
                    wifistate.setText("Disconnected");
                }

            }
        }
    };

    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
    registerReceiver(broadcastReceiver, intentFilter);


}

}

这是迭代。最终结果是正确的。

Answer 1

我以前见过这个。所以这就是我所做的。

注意：我为接收器使用了不同的 action。

这是您的解决方案：

IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(broadcastReceiver, intentFilter);

那么接收者：

BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        final String action = intent.getAction();
        Bundle extras = intent.getExtras();

        if (action.equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
            NetworkInfo networkInfo = (NetworkInfo) extras.get(ConnectivityManager.EXTRA_NETWORK_INFO);
            boolean connected = info.isConnected();
            if (connected && isWifiConnected()) {
                Log.i("RCVR", "True");
                wifistate.setText("Connected");
            } else {
                Log.i("RCVR", "False");
                wifistate.setText("Disconnected");
            }
        }
    }
};

检查WiFi是否连接：

public static boolean isWifiConnected() {
    ConnectivityManager cm = (ConnectivityManager) appContext.getSystemService(Context.CONNECTIVITY_SERVICE);
    return (cm.getActiveNetworkInfo().getType() == ConnectivityManager.TYPE_WIFI);
}

通过这种方式，您可以检查连接是否可用并检查连接是否为 WiFi。
它似乎对我有用。希望对你有帮助。

为什么我的 BroadcastReceiver On Wifi 更改时有多个状态更改

Why do I have several states change for a BroadcastReceiver On Wifi changes

android

broadcastreceiver

android-wifi