Question

我想通过点击它来隐藏一个片段XML的按钮，因为它总是会被隐藏，直到通过共享首选项卸载应用程序。但我收到错误，＆＃39; android.widget.button＆＃39;的未知方法setVisibility和＆＃39; btnsearch变量必须是最终用于本地课程＆＃39; 。这是我的代码：

package com.niezwm.bododictionary.fragments;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Toast;
import android.view.ViewGroup;
import android.widget.Button;
import android.content.Context;
import android.content.SharedPreferences;
import com.niezwm.bododictionary.R;


public class SearchFragment extends Fragment{

SharedPreferences sharedPreferences;
Button btnsearch;



public SearchFragment() {
// Required empty public constructor
 }

@Override
public void onCreate(Bundle     savedInstanceState) {
     super.onCreate(savedInstanceState);
}
@Override
public View   onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState){
View rootView =  inflater.inflate(R.layout.fragment_search, container,false);
Button btnsearch =(Button) rootView.findViewById(R.id.btnsearch);
SharedPreferences sharedPreferences =this.getActivity().getSharedPreferences("pref",0);
btnsearch.setVisiblity(sharedPreferences.getBoolean("visiblity",false));
      btnsearch.setOnClickListener(new   View.OnClickListener(){
@Override 
public void onClick(View view){
if(
                        btnsearch.getVisibility()==View.INVISIBLE){
      btnsearch.setVisibility(View.VISIBLE);
SharedPreferences.Editor editor = sharedPreferences.edit();  
                    editor.putBoolean("visiblity",true)
                        .commit();
                        }
                   Toast.makeText(getActivity(), "search", Toast.LENGTH_LONG).show();
}
// end onClick
});
return rootView;
}
// end onCreateView
}

Answer 1

如果您在匿名内部类中访问这两个变量，则必须使它们成为最终：

final Button btnsearch = (Button) rootView.findViewById(R.id.btnsearch);
final SharedPreferences sharedPreferences = this.getActivity().getSharedPreferences("pref", 0);

修改

setVisibility()想要一个int，而不是布尔值。

boolean visibility = sharedPreferences.getBoolean("visiblity", false); btnsearch.setVisibility(visibility ? View.VISIBLE : View.GONE);

在片段中单击它时隐藏按钮，始终使用共享首选项

1 个答案: