android BroadcastReceiver遇到 java.lang.IllegalAccessException解决方法

android BroadcastReceiver 遇到java.lang.IllegalAccessException解决方法

我在android 中监听wifi变化服务时，遇到错误
java.lang.IllegalAccessException，sth is not accessible from class android.app.ActivityThread，主要是app中其他地方调用了默认的构造函数，必须增加默认构造函数且访问权限为public

1.错误的部分代码

//通过一个BroadcastReceiver（android 四大组建之一），用于动态注册监听网络变化public class NetworkConnectChangedReceiver extends BroadcastReceiver{      OnWifiChangedListener changed;    Activity act;    public NetworkConnectChangedReceiver(Activity act){        this.act = act;    }    public void setChangedListener(OnWifiChangedListener changed) {        this.changed = changed;    }    @Override      public void onReceive(Context context, Intent intent) {          if (null == intent.getAction()){            return ;        }        // TODO Auto-generated method stub          if(intent.getAction().equals(WifiManager.RSSI_CHANGED_ACTION)){              //signal strength changed          }          else if(intent.getAction().equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)){//wifi连接上与否              System.out.println("网络状态改变");              NetworkInfo info = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);              if (null == info.getState()){                return ;            }            if(info.getState().equals(NetworkInfo.State.DISCONNECTED)){                System.out.println("wifi网络连接断开");                 if (act != null){                    //CommonAction.showToastMessageL(act, "wifi网络连接断开");                }            }            else if(info.getState().equals(NetworkInfo.State.CONNECTED)){                  WifiManager wifiManager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);                  WifiInfo wifiInfo = wifiManager.getConnectionInfo();                                  if ((null != wifiInfo) && (null != wifiInfo.getSSID()) && (!wifiInfo.getSSID().contains("unknown"))){                    //获取当前wifi名称                      System.out.println("连接到网络 " + wifiInfo.getSSID());                      if (act != null){//                      CommonAction.showToastMessageL(act, "连接到网络 " + wifiInfo.getSSID());                        changed.onChange(wifiInfo.getSSID());                    }                }            }          }          else if(intent.getAction().equals(WifiManager.WIFI_STATE_CHANGED_ACTION)){//wifi打开与否              int wifistate = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_DISABLED);              if(wifistate == WifiManager.WIFI_STATE_DISABLED){                  System.out.println("系统关闭wifi");                  //CommonAction.showToastMessageL(act, "系统关闭wifi");                changed.onClose();            }              else if(wifistate == WifiManager.WIFI_STATE_ENABLED){                System.out.println("系统开启wifi");                  //CommonAction.showToastMessageL(act, "系统开启wifi");            }          }      }      public interface OnWifiChangedListener {          void onChange(String wifiName);        void onClose();    }//Activity 中使用上面BroadcastReceiver及注册的代码public class ComListActivity extends Activity {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_com_list);             registerNetChangerReciver();    }    private void registerNetChangerReciver() {        IntentFilter filter = new IntentFilter();        filter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);        filter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);        filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);        if (null == netChangeRec){            netChangeRec = new NetworkConnectChangedReceiver(this);            netChangeRec.setChangedListener(new OnWifiChangedListener(){                @Override                public void onChange(String wifiName) {                    // TODO 自动生成的方法存根                    if (!connectWifiName.equals(wifiName)){// connected wifi is chanded                        CommonAction.showToastMessageL(ComListActivity.this, "连接到网络 " + wifiName);                        updateAutoMemorytData();                        updateListViewData();                        connectWifiName = wifiName;                    }                }                @Override                public void onClose() {                    // TODO 自动生成的方法存根                    connectWifiName = "";                }            });        }        registerReceiver(netChangeRec, filter);    }}

2.错误提示如下：
FATAL EXCEPTION: main
Process: com.chaoyuan.signalmachineconfig, PID: 4087
java.lang.RuntimeException: Unable to instantiate receiver com.chaoyuan.signalmachineconfig.NetworkConnectChangedReceiver: java.lang.IllegalAccessException: com.chaoyuan.signalmachineconfig.NetworkConnectChangedReceiver() is not accessible from class android.app.ActivityThread
at android.app.ActivityThread.handleReceiver(ActivityThread.java:2565)
at android.app.ActivityThread.access 1700(ActivityThread.java:147)atandroid.app.ActivityThread H.handleMessage(ActivityThread.java:1362)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5238)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:909)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:704)
Caused by: java.lang.IllegalAccessException: com.chaoyuan.signalmachineconfig.NetworkConnectChangedReceiver() is not accessible from class android.app.ActivityThread
at java.lang.Class.newInstance(Class.java:1569)
at android.app.ActivityThread.handleReceiver(ActivityThread.java:2560)
… 9 more

3.错误修改说明
错误原因主要是app中其他地方调用了默认的构造函数，必须增加默认构造函数且访问权限为public:

public class NetworkConnectChangedReceiver extends BroadcastReceiver{

........//添加默认构造函数，且为publicpublic NetworkConnectChangedReceiver(){}public NetworkConnectChangedReceiver(Activity act){    this.act = act;}.......

}

android BroadcastReceiver 遇到java.lang.IllegalAccessException解决方法

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