Question

我有两个片段。单击第一个按钮后，它会移动到带有一些SharedPreferences的第二个片段。每次我点击那个按钮，我想在另一个下面添加新的textview，并在第二个片段中添加来自SharedPreferences的文本。

以下是我要添加textviews的第二个片段的代码

    public class HomeFragment extends Fragment{


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

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.fragment_home, container, false);

        SharedPreferences sharedPreferences = this.getActivity().getSharedPreferences("MyData", Context.MODE_PRIVATE);
        String Income =sharedPreferences.getString("Income","N/A");

        LinearLayout m_ll = (LinearLayout) view.findViewById(R.id.home);

        m_ll.addView(createNewTextView(Income));
        return m_ll;
    }

    private TextView createNewTextView(String text) {
        final LinearLayoutCompat.LayoutParams lparams = new LinearLayoutCompat.LayoutParams(LinearLayoutCompat.LayoutParams.WRAP_CONTENT, LinearLayoutCompat.LayoutParams.WRAP_CONTENT);
        final TextView textView = new TextView(getActivity());
        textView.setLayoutParams(lparams);
        textView.setText("New text: " + text);
        return textView;
    }
}

它使用正确的文本添加textview，但是下次按下按钮时它只是更改textview的文本（或在另一个上创建一个textview？）

XML

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:id="@+id/home"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.xxxx.HomeFragment">

<!-- TODO: Update blank fragment layout -->
</LinearLayout>

Answer 1

我设法使它与TinyDB一起使用，它可以将字符串arraylist存储为SharedPreferences。

这就是我在片段中的按钮

TinyDB tinydb=new TinyDB(getActivity().getApplicationContext());

    incometemp = edttxt.getText().toString();
    mylist= tinydb.getListString("income");
    mylist.add(incometemp );
    tinydb.putListString("income", mylist);

第二个片段

TinyDB tinydb;
    ArrayList<String> mylist = new ArrayList<>();

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.fragment_home, container, false);
        tinydb = new TinyDB(getActivity().getApplicationContext());
        mylist = tinydb.getListString("income");
        LinearLayout m_ll = (LinearLayout) view.findViewById(R.id.home);

        for (int i=0;i<mylist.size();i++) {
            m_ll.addView(createNewTextView(mylist.get(i)));
        }


        return m_ll;
    }

    private TextView createNewTextView(String text) {
        final LinearLayoutCompat.LayoutParams lparams = new LinearLayoutCompat.LayoutParams(LinearLayoutCompat.LayoutParams.WRAP_CONTENT, LinearLayoutCompat.LayoutParams.WRAP_CONTENT);
        final TextView textView = new TextView(getActivity());
        textView.setLayoutParams(lparams);
        textView.setText("New text: " + text);
        return textView;
    }
}

单击另一个片段中的按钮后，在片段中添加新的textview

1 个答案: