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[英]The method getSupportFragmentManager() is undefined for the type Fragment
[英]Android - The method “…” is undefined for the type Fragment
我在片段類內部創建了一個名為“ changeText”的方法,該方法將在創建片段后立即更改該片段的兩個TextView。 問題是我無法從我的活動中調用方法“ changeText”,因為我收到錯誤消息“對於類型Fragment,未定義方法changeText(String [])”,就像它不存在一樣。
我在哪里做錯了?
這是我的片段類:
package com.example.quizone_2;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class fragment_corretto extends Fragment {
TextView questionTv, answerTv;
public fragment_corretto() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_corretto, container,
false);
questionTv = (TextView)rootView.findViewById(R.id.question);
answerTv = (TextView)rootView.findViewById(R.id.answer);
return rootView;
}
public void changeText(String[] text){
questionTv.setText(text[1]);
answerTv.setText(text[0]);
}
}
這是我的活動文件中的方法,在這里我將其稱為changeText方法:
public void answerTrue(View view){
if(info[2] == "1"){
// Create new fragment and transaction
Fragment newFragment = new fragment_corretto();
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack
transaction.replace(R.id.container, newFragment);
// Commit the transaction
transaction.commit();
newFragment.changeText(info);
}else{
// Create new fragment and transaction
Fragment newFragment = new Fragment_sbagliato();
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack
transaction.replace(R.id.container, newFragment);
// Commit the transaction
transaction.commit();
newFragment.changeText(info);
}
}
提前非常感謝您。
在您的Activity
, newFragment
被聲明為Fragment
。 一個簡單的Fragment
沒有changeText
方法或子類的其他任何方法。
解決方案是將newFragment
聲明為fragment_corretto
:
fragment_corretto newFragment = new fragment_corretto();
PS。 您應遵循使用pascal大小寫命名類的約定。 換句話說,不要將其命名為fragment_corretto
,而是將其命名為FragmentCorretto
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