Java Android:传递给方法时,上下文为null
在我的应用程序类中,InboxTabFragment的实例化如下所示: InboxTabFragment.javaJava Android:传递给方法时,上下文为null,java,android,Java,Android,在我的应用程序类中,InboxTabFragment的实例化如下所示: InboxTabFragment.java public class InboxFragmentTab extends ListFragment implements LoaderManager.LoaderCallbacks<Cursor> { private static final Uri SMS_CONTENT_URI = Uri.parse("content://sms"); private stati
public class InboxFragmentTab extends ListFragment implements LoaderManager.LoaderCallbacks<Cursor> {
private static final Uri SMS_CONTENT_URI = Uri.parse("content://sms");
private static final Uri SMS_INBOX_CONTENT_URI = Uri.withAppendedPath(SMS_CONTENT_URI, "inbox");
private static final String COLUMNS[] = new String[] {"person", "address", "body", "date", "type"};
SimpleCursorAdapter adapter;
Context context;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.inbox_layout, container, false);
getLoaderManager().initLoader(0, null, this);
return rootView;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
CursorLoader loader = new CursorLoader(this.getActivity(), SMS_INBOX_CONTENT_URI, COLUMNS,
null, null, null);
return loader;
}
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor c) {
ArrayList<Sms> result = new ArrayList<Sms>();
if(c!=null) {
for(boolean hasData = c.moveToFirst(); hasData; hasData=c.moveToNext()){
boolean isSent = c.getInt(c.getColumnIndex("type")) == 2;
String address = c.getString(c.getColumnIndex("address"));
String sender = ContactManager.getContactName(context, address);
String receiver = "Me";
Sms sms = new Sms(address, c.getString(c.getColumnIndex("body")), new Date(Long.parseLong(c.getString(c.getColumnIndex("date")))), isSent ? sender : receiver);
sms.setSender(isSent ? receiver : sender);
result.add(sms);
}
}
SmsAdapter adapter = new SmsAdapter(getActivity(), R.layout.row, result);
setListAdapter(adapter);
}
@Override
public void onLoaderReset(Loader<Cursor> loader) {
}
方法参数中传递的上下文为null,我不知道如何处理这个问题。
如果有人愿意帮我解决这个问题,我将不胜感激。试试
context=this.getActivity().getApplicationContext()请在使用它之前使用它。尝试context=this.getActivity().getApplicationContext()在使用它之前进行编码。您从未将at值赋值给上下文对象。加:
context=this.getActivity().getApplicationContext()
您从未将at值赋值给上下文
对象。加:
context=this.getActivity().getApplicationContext()
尝试传递getActivity()
而不是context
使用getApplicationContext()
或你的活动类的this
尝试传递getActivity()
而不是context
使用getApplicationContext()
或你的活动类的this
String sender = ContactManager.getContactName(context, address);