Android - 按行分割字符串

Question

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

显示所有在相同的索引：

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（负载）

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

您的如果条件错误。

在TubeDataFragment，在onClick()方法使用下面的代码：

............. 
    .................. 
    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++; 
    } 

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