簡體   English   中英

如何繞過片段類中的靜態引用?

[英]How to get around the static reference in a fragment class?

我正在嘗試引用linearLayout,並在fragment類的onViewCreated中使用sharedpreference,但這會產生3個語法錯誤,即“無法對非靜態方法進行靜態引用”。 我知道為什么會這樣,但我想不出辦法。 我嘗試將靜態標識符刪除到fragment類,但這只是導致一個問題導致下一個問題。 而且,我無法將這段代碼放在onCreate()中,因為我是在片段中引用視圖。

帶有靜態錯誤的代碼行是:

 getApplicationContext()
 findViewById()
 FillInInfo(v);

我可以通過將其靜態化來輕松修復FillInInfo(v),但我還是發布了它,以防萬一我不必使其靜態化。

這是片段類:

 public static class PlaceholderFragment extends Fragment {
    /**
     * The fragment argument representing the section number for this
     * fragment.
     */
    private static final String ARG_SECTION_NUMBER = "section_number";

    /**
     * Returns a new instance of this fragment for the given section number.
     */
    public static PlaceholderFragment newInstance(int sectionNumber) {
        PlaceholderFragment fragment = new PlaceholderFragment();
        Bundle args = new Bundle();
        args.putInt(ARG_SECTION_NUMBER, sectionNumber);
        fragment.setArguments(args);
        return fragment;
    }

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_manage_day,
                container, false);


        TextView textView = (TextView) rootView
                .findViewById(R.id.section_label);
        textView.setText(Integer.toString(getArguments().getInt(
                ARG_SECTION_NUMBER)));
        return rootView;
    }

    public void onViewCreated(View v, Bundle savedInstanceState) {
        super.onViewCreated(v, savedInstanceState);

        SharedPreferences activitiesFile = getApplicationContext().getSharedPreferences("Activities", 0);
        Set<String> keylist = activitiesFile.getAll().keySet();
        for (String s : keylist) {
            String active = activitiesFile.getString(s, "");
            Button activeName=new Button(getActivity());
            activeName.setText(active);
            activeName.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, 
                    LayoutParams.WRAP_CONTENT));
            LinearLayout layout=(LinearLayout) findViewById(R.id.ActivityList);
            activeName.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    FillInInfo(v);
                }
            });
            layout.addView(activeName);

        }

    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        ((ManageDay) activity).onSectionAttached(getArguments().getInt(
                ARG_SECTION_NUMBER));
    }
}

請記住,此代碼塊必須保持在一起:

  SharedPreferences activitiesFile = getApplicationContext().getSharedPreferences("Activities", 0);
        Set<String> keylist = activitiesFile.getAll().keySet();
        for (String s : keylist) {
            String active = activitiesFile.getString(s, "");
            Button activeName=new Button(getActivity());
            activeName.setText(active);
            activeName.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, 
                    LayoutParams.WRAP_CONTENT));
            LinearLayout layout=(LinearLayout) findViewById(R.id.ActivityList);
            activeName.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    FillInInfo(v);
                }
            });
            layout.addView(activeName);

        }

代碼到我的FillInInfo()方法:

 public void FillInInfo(View view){
    Intent intent=new Intent(this,ActivityInfo.class);
    Button button=(Button)view;
    String buttonName=button.getText().toString();
    intent.putExtra("Name",buttonName);

    SharedPreferences preferences = getPreferences(MODE_PRIVATE);
    SharedPreferences.Editor editor = preferences.edit();
    editor.putInt("count",count);

    startActivity(intent);

}

在片段內部時,僅當Fragment不是靜態的時,才可以直接訪問getApplicationContext() 如果是這樣,則為了獲取Context對象,請使用getActivity()

至於從片段布局文件訪問View,則必須從Fragment rootView調用findViewById() ,該函數在onViewCreated()回調第一個參數( View v)上返回。

暫無
暫無

聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.

 
粵ICP備18138465號  © 2020-2024 STACKOOM.COM