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问题描述
我要当用户激活互联网进行操作,但我得到了以下错误:
java.lang.InstantiationException:无法实例类com.project.proj.NetworkChangeReceiver;没有空的构造
在一个活动类我写了下面的
NetworkChangeReceiver净值=新NetworkChangeReceiver(getBaseContext());
我要去哪里错了。请帮助!
公共类NetworkChangeReceiver扩展广播接收器
{
上下文mContext;
公共NetworkChangeReceiver(上下文的背景下)
{
mContext =背景;
} @覆盖
公共无效的onReceive(最终上下文的背景下,最终的意图意图){ 字符串状态= NetworkUtil.getConnectivityStatusString(背景);
如果(状态==WLAN网络)
{
数据库信息=新的数据库(mContext);
details.open();
清单<串GT; detailsId;
detailsId = details.getRecords();
retrieveValuesFromListMethod1(detailsId);
Toast.makeText(背景下,正常工作,Toast.LENGTH_SHORT).show();
}
Toast.makeText(上下文,状态Toast.LENGTH_SHORT).show();
}
公共无效retrieveValuesFromListMethod1(名单detailsId)
{ 迭代器ITR = detailsId.iterator();
而(itr.hasNext())
{
//做一点事 }
}
}
解决方案
删除:
上下文mContext;
公共NetworkChangeReceiver(上下文的背景下)
{
mContext =背景;
}
I want to perform operation when the user has internet activated but i get the following error :
java.lang.InstantiationException: can't instantiate class com.project.proj.NetworkChangeReceiver; no empty constructor
In an activity class i have written the following
NetworkChangeReceiver net = new NetworkChangeReceiver(getBaseContext());
where am I going wrong. Please help !
public class NetworkChangeReceiver extends BroadcastReceiver
{
Context mContext;
public NetworkChangeReceiver(Context context)
{
mContext= context;
}
@Override
public void onReceive(final Context context, final Intent intent) {
String status = NetworkUtil.getConnectivityStatusString(context);
if (status == "Wifi enabled")
{
Database details=new Database(mContext);
details.open();
List<String> detailsId;
detailsId=details.getRecords();
retrieveValuesFromListMethod1(detailsId);
Toast.makeText(context, "working properly", Toast.LENGTH_SHORT).show();
}
Toast.makeText(context, status, Toast.LENGTH_SHORT).show();
}
public void retrieveValuesFromListMethod1(List detailsId)
{
Iterator itr = detailsId.iterator();
while(itr.hasNext())
{
//do something
}
}
}
解决方案
Remove:
Context mContext;
public NetworkChangeReceiver(Context context)
{
mContext= context;
}
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