如何在添加新项

时间：2016-07-18 14:18:59

标签： android sorting listview android-fragments

我是android的新手。我尝试使用自定义列表视图并遇到一些问题。我有2个片段，片段A显示列表视图，片段B添加新项目。当我单击按钮添加片段B时，片段A将显示，我希望新项目将添加到列表视图中，然后排序列表视图跟随Alphabel。每件事看起来都很棒，但是当在ListView中添加项目时，它总是位于列表视图的末尾，并且没有使用旧项目进行排序。我的ListView只是将我刚刚添加到listview中的项目排序。例如：我的列表视图显示名称：Ironman，Captain，Warmachine。我添加的新名称是：Dare Devil，Alibaba，Songoku。 listView将显示为：Captain，Ironman，Warmachine，Alibaba，Dare Devil，Songoku。我希望我的列表视图必须如此：阿里巴巴，船长，DareDevel，Ironman，Songoku和warachine。任何人都可以让我知道我该怎么做？。

这是我的代码：

MainActivity 

public class MainActivity extends AppCompatActivity implements IMainClass, ICommunicator{
private  ArrayList<StudentModel> arrayListStudent;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    displayFragment();

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

@Override
public void findViewByID() {

}

@Override
public void displayFragment() {
    MainFragment mainFragment = new MainFragment();
    FragmentManager fragmentManager = this.getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.replace(R.id.container_body,mainFragment, "main");
    fragmentTransaction.commit();
}

@Override
public void eventClickButton() {

}


@Override
public void add(StudentModel studentModel) {
    MainFragment mainFragment = (MainFragment)getSupportFragmentManager().findFragmentByTag("main");
    mainFragment.addStudentToList(studentModel);
}

自定义适配器 

public class ArrayAdapterStudent extends ArrayAdapter<StudentModel> {
List<StudentModel> listStudent;
@Override
public int getPosition(StudentModel item) {
    return super.getPosition(item);
}

public ArrayAdapterStudent(Context context, int resource, List<StudentModel> objects) {
    super(context, resource, objects);
    this.listStudent = objects;
}

@Override
public StudentModel getItem(int position) {
    return super.getItem(position);
}

@Override
public int getCount() {
    return super.getCount();
}

@Override
public Context getContext() {
    return super.getContext();
}

@Override
public long getItemId(int position) {
    return super.getItemId(position);
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    ViewHolder viewHolder;
    if(convertView==null){
        convertView = LayoutInflater.from(getContext()).inflate(R.layout.custom_row_listview,parent,false);
        viewHolder = new ViewHolder();
        viewHolder.tvName = (TextView)convertView.findViewById(R.id.tv_name);
        viewHolder.tvAge = (TextView)convertView.findViewById(R.id.tv_age);
        viewHolder.tvClass = (TextView)convertView.findViewById(R.id.tv_class);
        viewHolder.tvSubject = (TextView)convertView.findViewById(R.id.tv_subjects);
        viewHolder.chkStudent = (CheckBox)convertView.findViewById(R.id.chk_student);
        viewHolder.chkStudent.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                int getPosition = (Integer)buttonView.getTag();
                listStudent.get(getPosition).set_isChecked(buttonView.isChecked());
            }
        });
        convertView.setTag(viewHolder);

    }
    else{
        viewHolder = (ViewHolder)convertView.getTag();
    }
    viewHolder.tvName.setText("Name: "+listStudent.get(position).get_name());
    viewHolder.tvAge.setText("Age: "+listStudent.get(position).get_age()+"");
    viewHolder.tvClass.setText("Class: "+listStudent.get(position).get_class());
    viewHolder.tvSubject.setText("Subject: "+listStudent.get(position).get_subject());
    viewHolder.chkStudent.setTag(position);
    viewHolder.chkStudent.setChecked(listStudent.get(position).is_Checked());
    return convertView;
}

ViewHolder 

public class ViewHolder {
TextView tvName, tvAge,tvClass,tvSubject;
CheckBox chkStudent;

}

ListFragment 

public class MainFragment extends Fragment implements IMainClass {
private ListView lvStudent;
private Button btnAdd;
ArrayAdapterStudent arrayAdapterStudent;
private  ArrayList<StudentModel> arrayListStudent;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    listStudent();
    Log.d("Test"," OnCreate");
}



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

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    findViewByID();
    loadStudentToListView();
    choosingStudentInListView();
    deleteStudent();
    eventClickButton();
    Log.d("Test", " OnActivityCreate");

}

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
}


private void loadStudentToListView(){
    /*Collections.sort(arrayListStudent, new Comparator<StudentModel>() {
        @Override
        public int compare(StudentModel lhs, StudentModel rhs) {
            return  lhs.get_name().compareTo(rhs.get_name());
        }
    });
    */
    arrayAdapterStudent = new ArrayAdapterStudent(getActivity(),R.layout.custom_row_listview,arrayListStudent);
    arrayAdapterStudent.sort(new Comparator<StudentModel>() {
        @Override
        public int compare(StudentModel lhs, StudentModel rhs) {
            return lhs.get_name().compareTo(rhs.get_name());
        }
    });

    lvStudent.setAdapter(arrayAdapterStudent);
    arrayAdapterStudent.notifyDataSetChanged();
}
@Override
public void findViewByID() {
    lvStudent = (ListView) getActivity().findViewById(R.id.lv_student);
    btnAdd = (Button)getActivity().findViewById(R.id.btn_add);
}

@Override
public void displayFragment() {

}

@Override
public void eventClickButton() {
    btnAdd.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            AddNewStudentFragment addNewStudentFragment = new AddNewStudentFragment();
            FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
            FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
            fragmentTransaction.replace(R.id.container_body, addNewStudentFragment);
            fragmentTransaction.addToBackStack(null);
            fragmentTransaction.commit();
        }
    });
}

private void choosingStudentInListView(){
    lvStudent.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            StudentModel studentModel = arrayListStudent.get(position);
            studentBundel(studentModel);
            Log.d("Test", "Student " + studentModel.is_Checked() + "is click");
        }
    });
}

private void deleteStudent(){
    lvStudent.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(final AdapterView<?> parent, View view, final int position, long id) {
            new AlertDialog.Builder(getActivity()).setTitle("Notification").setMessage("Are your sure deleting this student ?")
                    .setNeutralButton("Yes", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            arrayListStudent.remove(position);
                            arrayAdapterStudent.notifyDataSetChanged();
                        }
                    }).setPositiveButton("No", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {

                }
            }).show();
            return true;
        }
    });
}


private void studentBundel(StudentModel studentModel){
    DetailStudentFragment detailStudentFragment = new DetailStudentFragment();
    Bundle inforStudentBundel = new Bundle();
    inforStudentBundel.putSerializable("student",studentModel);
    detailStudentFragment.setArguments(inforStudentBundel);

    FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.replace(R.id.container_body,detailStudentFragment);
    fragmentTransaction.addToBackStack(null);
    fragmentTransaction.commit();
}

public ArrayList<StudentModel> listStudent(){
    String name = "";
    int age = 18;
    String Subject[] = {"Android","IOS","Java",".NET","C#"};
    int subjectPosition = 0;
    arrayListStudent = new ArrayList<StudentModel>();
    for (int i = 0; i < 10; i++){
        //Add student name Angela =>group name A
        name = "Angela "+i;
        StudentModel studentA = new StudentModel(name,age,"TVO",Subject[subjectPosition].toString());
        subjectPosition = subjectPosition++;
        arrayListStudent.add(studentA);

        //Add student name Beta =>Group name B
        name = "BeTa"+i;
        StudentModel studentB = new StudentModel(name,age,"TVO",Subject[subjectPosition].toString());
        subjectPosition = subjectPosition++;
        arrayListStudent.add(studentB);

        //Add student name Cadic =>Group name B
        name = "Cadic"+i;
        StudentModel studentC = new StudentModel(name,age,"TVO",Subject[subjectPosition].toString());
        subjectPosition = subjectPosition++;
        arrayListStudent.add(studentC);

        //Add Student name David
        name = "David"+i;
        StudentModel studentD = new StudentModel(name,age,"TVO",Subject[subjectPosition].toString());
        subjectPosition = subjectPosition++;
        arrayListStudent.add(studentD);

        //Add Student name Electro
        name = "Electro"+i;
        StudentModel studentE = new StudentModel(name,age,"TVO",Subject[subjectPosition].toString());
        subjectPosition = subjectPosition++;
        arrayListStudent.add(studentE);

        //Add Student name Kame
        name = "Kame"+i;
        StudentModel studentK = new StudentModel(name,age,"TVO",Subject[subjectPosition].toString());
        subjectPosition = subjectPosition++;
        arrayListStudent.add(studentK);

        //add Student name Songoku
        name = "Songoku"+i;
        StudentModel studentS = new StudentModel(name,age,"TVO",Subject[subjectPosition].toString());
        subjectPosition = subjectPosition++;
        arrayListStudent.add(studentS);
    }
    return arrayListStudent;
}

public void addStudentToList(StudentModel studentModel){
    arrayListStudent.add(studentModel);
  //  arrayAdapterStudent.notifyDataSetChanged();
    Log.d(" Test", arrayListStudent+"aaaaa");
    //
    // What is different when use arrListStudent.add an
    //arrayAdapterStudent.insert(studentModel,0);
}

添加片段 

public class AddNewStudentFragment extends Fragment implements IMainClass {
private EditText edtName, edtAge, edtClass, edtSubject;
private Button btnAddNewStudent;
ICommunicator iCommunicator;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.add_student_fragment,container,false);
    return rootView;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    findViewByID();
    iCommunicator = (ICommunicator)getActivity();
    eventClickButton();
}

@Override
public void findViewByID() {
    edtName = (EditText)getActivity().findViewById(R.id.edt_name);
    edtAge = (EditText)getActivity().findViewById(R.id.edt_age);
    edtClass = (EditText)getActivity().findViewById(R.id.edt_class);
    edtSubject = (EditText)getActivity().findViewById(R.id.edt_subject);
    btnAddNewStudent = (Button)getActivity().findViewById(R.id.btn_add_new_student);
}

@Override
public void displayFragment() {

}

@Override
public void eventClickButton() {
    btnAddNewStudent.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String name = edtName.getText().toString();
            int age = Integer.parseInt(edtAge.getText().toString());
            String classes = edtClass.getText().toString();
            String subject = edtSubject.getText().toString();
            StudentModel studentModel = new StudentModel(name, age, classes, subject);
            iCommunicator.add(studentModel);
            FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
            fragmentManager.popBackStack();
        }
    });
}

ICommunicator界面 

public interface ICommunicator {
public void add(StudentModel studentModel);

}

IMain界面 

public interface IMainClass  {
public void findViewByID();
public void displayFragment();
public void eventClickButton();

}

StudentModel 

public void set_name(String _name) {
    this._name = _name;
}

public int get_age() {
    return _age;
}

public void set_age(int _age) {
    this._age = _age;
}

public String get_class() {
    return _class;
}

public void set_class(String _class) {
    this._class = _class;
}

public String get_subject() {
    return _subject;
}

public void set_subject(String _subject) {
    this._subject = _subject;
}

}

p / s：谢谢你阅读我的问题。

3 个答案:

答案 0 :(得分：0)

您可以在ArrayAdapter上调用notifyDataSetChanged（）来刷新listview项目。

答案 1 :(得分：0)

在添加新学生后调用loadStudentToListView()以对视图进行排序和刷新：

public void addStudentToList(StudentModel studentModel){
    arrayListStudent.add(studentModel);
    loadStudentToListView();
}

答案 2 :(得分：0)

最后我知道我的问题是什么。我的问题来自排序功能。此函数遵循ASCII标准代码，因此它在upercase和小写之间有区别。所以，如果我想在插入新项目后对列表视图进行排序。我需要将所有这些转换为upercase或小写。就我而言，这段代码将完全排序。

Collections.sort(arrayListStudent, new Comparator<StudentModel>() {
   @Override
   public int compare(StudentModel lhs, StudentModel rhs) {
       return  lhs.get_name().toUpperCase().compareTo(rhs.get_name().toUpperCase());
}
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