Android - 按行分割字符串

Question

我正在尝试在SharedPreferences上保存4个变量的数据并将其加载到列表中。我的问题是它显示了列表第一行中的所有数据。我想分开：每次我点击保存按钮我想保存4个变量，当我再次点击它时，我想保存新变量并显示一个新行。

在同一索引上显示全部：

TubeDataFragment（保存）：

public class TubeDataFragment extends Fragment {

List<String> tubeData = new ArrayList<>();


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


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_tube_data, container, false);

    final Spinner spinnerMaterial = (Spinner) view.findViewById(R.id.snipperMaterial);
    ArrayAdapter<String> myAdapter = new ArrayAdapter<String>(getActivity(), R.layout.spinner_item, getResources().getStringArray(R.array.material));
    myAdapter.setDropDownViewResource(R.layout.spinner_dropdown_item);
    spinnerMaterial.setAdapter(myAdapter);
    //controls
    Button btn_saveTube = (Button) view.findViewById(R.id.btn_save_tube);
    final EditText et_diameter = (EditText) view.findViewById(R.id.et_diameter);
    final EditText et_clr = (EditText) view.findViewById(R.id.et_clr);
    final EditText et_thickness = (EditText) view.findViewById(R.id.et_thickness);

    //guarda dados do tubo
    btn_saveTube.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            tubeData.add(" Diameter: " + et_diameter.getText().toString());
            tubeData.add(" Thickness: " + et_thickness.getText().toString());
            tubeData.add(" CLR: " + et_clr.getText().toString());
            tubeData.add(" Material: " + spinnerMaterial.getSelectedItem().toString());

            StringBuilder stringBuilder = new StringBuilder();
            int i = 1;
            for(String data : tubeData)
            {
                stringBuilder.append(data);
                stringBuilder.append(";");

                if(i++ == tubeData.size())
                {
                    stringBuilder.append("\n");
                }

            }
            SharedPreferences settings = getActivity().getSharedPreferences("PREFS",0);
            SharedPreferences.Editor editor = settings.edit();
            editor.putString("tubeData", stringBuilder.toString());
            editor.commit();
        }
    });

    return view;
}

}

ArchiveFragment（加载）

public class ArchiveFragment extends Fragment {


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


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_archive, container, false);

    ListView tubeDataList = (ListView) view.findViewById(R.id.tubeData_list);

    //load tube data
    SharedPreferences settings = getActivity().getSharedPreferences("PREFS",0);
    String tubeDataString = settings.getString("tubeData", "");
    String[] tubeDataSplit = tubeDataString.split("\n");

    List<String> tubeDataItems = new ArrayList<>();

    for(int i=0; i<tubeDataSplit.length;i++)
    {
        tubeDataItems.add(tubeDataSplit[i]);
    }

    ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(),
            android.R.layout.simple_list_item_1, android.R.id.text1, tubeDataItems);


    // Assign adapter to ListView
    tubeDataList.setAdapter(adapter);

    return view;
}

}

Answer 1

if 条件错误。

在TubeDataFragment中，使用onClick()方法中的以下代码：

    .............
    ..................
    StringBuilder stringBuilder = new StringBuilder();
    int i = 1;
    for(String data : tubeData)
    {
        stringBuilder.append(data);
        stringBuilder.append(";");

        if(i == 4)
        {
            stringBuilder.append("\n");
            i = 0;
        }
        i++;
    }

    ...............
    .......................