BroadcastReceiver를 이용한 Wifi 상태 감시

Question

receiver 클래스 입니다..

 

package com.example.iswifi;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.wifi.WifiManager;
import android.widget.Toast;

public class ShowWiFiMonitor extends BroadcastReceiver {
	public final static int WIFI_STATE_DISABLED = 0x00;
	public final static int WIFI_STATE_DISABLING = WIFI_STATE_DISABLED + 1;
	public final static int WIFI_STATE_ENABLED = WIFI_STATE_DISABLING + 1;
	public final static int WIFI_STATE_ENABLING = WIFI_STATE_ENABLED + 1;
	public final static int WIFI_STATE_UNKNOWN = WIFI_STATE_ENABLING + 1;
	public final static int NETWORK_STATE_CONNECTED = WIFI_STATE_UNKNOWN + 1;
	public final static int NETWORK_STATE_CONNECTING = NETWORK_STATE_CONNECTED + 1;
	public final static int NETWORK_STATE_DISCONNECTED = NETWORK_STATE_CONNECTING + 1;
	public final static int NETWORK_STATE_DISCONNECTING = NETWORK_STATE_DISCONNECTED + 1;
	public final static int NETWORK_STATE_SUSPENDED = NETWORK_STATE_DISCONNECTING + 1;
	public final static int NETWORK_STATE_UNKNOWN = NETWORK_STATE_SUSPENDED + 1;

	public interface OnChangeNetworkStatusListener {
		public void OnChanged(int status);
	}

	public ShowWiFiMonitor() {
		super();
	}

	private WifiManager wifiManager = null;
	private ConnectivityManager connManager = null;
	private OnChangeNetworkStatusListener onChangeNetworkStatusListener = null;

	public ShowWiFiMonitor(Context context) {
		wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
		connManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
	}

	public void setOnChangeNetworkStatusListener(OnChangeNetworkStatusListener listener) {
		onChangeNetworkStatusListener = listener;
	}

	@Override
	public void onReceive(Context context, Intent intent) {
		if (onChangeNetworkStatusListener == null) {
			return;
		}

		String strAction = intent.getAction();
		if (strAction.equals(WifiManager.WIFI_STATE_CHANGED_ACTION)) {
			switch (wifiManager.getWifiState()) {
			case WifiManager.WIFI_STATE_DISABLED:
				onChangeNetworkStatusListener.OnChanged(WIFI_STATE_DISABLED);
				Toast.makeText(context, "WIFI_STATE_DISABLED", Toast.LENGTH_SHORT).show();
				break;
			
.
.
.생략
			case WifiManager.WIFI_STATE_UNKNOWN:
				onChangeNetworkStatusListener.OnChanged(WIFI_STATE_UNKNOWN);
				Toast.makeText(context, "WIFI_STATE_UNKNOWN", Toast.LENGTH_SHORT).show();
				break;
			}
		} .
.
.생략
	}
}

 

 

메인 엑티비티입니다..

 

package com.example.iswifi;

import android.app.Activity;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.util.Log;


public class MainActivity extends Activity {

	private ShowWiFiMonitor showWifiMonitor = null;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		ShowWiFiMonitor showWiFiMonitor = new ShowWiFiMonitor(this);
		showWiFiMonitor.setOnChangeNetworkStatusListener(SnowChangedListener);
		registerReceiver(showWifiMonitor, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
		registerReceiver(showWifiMonitor, new IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION));
	}
	
		@Override
	protected void onDestroy() {
		super.onDestroy();
		unregisterReceiver(showWifiMonitor);
	}

	ShowWiFiMonitor.OnChangeNetworkStatusListener SnowChangedListener = new ShowWiFiMonitor.OnChangeNetworkStatusListener() {
		@Override
		public void OnChanged(int status) {
			switch (status) {
			case ShowWiFiMonitor.WIFI_STATE_DISABLED:
				Log.i("WIFIMONITOR", "[WifiMonitor] WIFI_STATE_DISABLED");
				break;

			case ShowWiFiMonitor.WIFI_STATE_DISABLING:
				Log.i("WIFIMONITOR", "[WifiMonitor] WIFI_STATE_DISABLING");
				break;

			
.
.
.
.생략
			case ShowWiFiMonitor.NETWORK_STATE_UNKNOWN:
				Log.i("WIFIMONITOR", "[WifiMonitor] WIFI_STATE_DISABLED");
				break;

			}
		}
	};

}

 

 

메니패스트입니다..

 

퍼미션

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />

리시버

 

<receiver
            android:name=".ShowWiFiMonitor"
            android:enabled="true"
            android:priority="0" >
            <intent-filter>
                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
            </intent-filter>
        </receiver>

 

 

메인 레이아웃은 그냥 helloworld입니다.

 

앱 실행하고 와이파이 상태를 껐다켰다했을 때 로그나 토스트를 띄워 확인을 하려 했으나

 

변화를 주는순간

 

 

05-07 11:27:32.324: E/AndroidRuntime(5372): FATAL EXCEPTION: main

05-07 11:27:32.324: E/AndroidRuntime(5372): java.lang.RuntimeException: Unable to instantiate receiver com.example.iswifi.ShowWiFiMonitor: java.lang.InstantiationException: can't instantiate class com.example.iswifi.ShowWiFiMonitor; no empty constructor

.

.

.

.

.

05-07 11:27:32.324: E/AndroidRuntime(5372): Caused by: java.lang.InstantiationException: can't instantiate class com.example.iswifi.ShowWiFiMonitor; no empty constructor

 

이런 에러로그가 뜨는데요..

 

기본 생성자가 없데서 생성도 해줬고..

 

InstantiationException이 인스턴스를 객체로 생성하려고 해서 생긴 예외라던데

 

그런적도 없고..,

 

뭐가 문제일까요..