ListView实现多布局(下)

最新推荐文章于 2019-06-19 21:30:14 发布

原创最新推荐文章于 2019-06-19 21:30:14 发布 · 372 阅读

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文章标签：

#listview #布局 #控件 #泛型 #源码

android 专栏收录该内容

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本文介绍了一种自定义泛型适配器的方法，并通过示例代码展示了如何为不同类型的对象创建不同的视图布局，包括学生和老师的布局。通过继承自定义泛型适配器，可以有效地实现多布局效果。

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上一篇我们说到了自定义的泛型适配器，那么如何调用呢？

首先，我们要写一个适配器，继承自定义的泛型适配器

<strong><span style="font-size:18px;">public class ObjectAdapter extends MyAdapter<Object>{

    public ObjectAdapter(List<Object> items) {
        super(items);
    }
</span></strong>

<strong><span style="font-size:18px;">
</span></strong>

<strong><span style="font-size:18px;">    @Override//设置布局
    public View getItemView(int position, View convertView, ViewGroup parent) {
        int i=getItemViewType(position);
        if(i==1){//学生布局
            return View.inflate(parent.getContext(), R.layout.studenu,null);
        }else if(i==2){//老师布局
            return View.inflate(parent.getContext(), R.layout.teacher,null);
        }
        return null;
    }

    @Override
    public ViewHolaer onCreateViewHolaer(int position, View convertView) {
        int i=getItemViewType(position);
        ViewHolaer holaer=null;

        if(i==1){//学生布局
           holaer= new MyStudentHolaer(convertView);

        }else if(i==2){//老师布局
            holaer= new MyTeacherHolaer(convertView);
        }
        return holaer;

    }

    @Override
    public void onBindViewHolaer(int position, ViewHolaer holaer) {
        int i=getItemViewType(position);
        Object object=getItem(position);

        if(i==1){//设置控件显示的内容
            Student student= (Student) object;
            MyStudentHolaer holaer1= (MyStudentHolaer) holaer;
            holaer1.student_name.setText(student.name);
            holaer1.student_age.setText(student.age+"");
            holaer1.student_time.setText(new SimpleDateFormat("yyyy-MM-dd  HH:mm:ss").format(System.currentTimeMillis()));

        }else if(i==2){
            Teacher teacher= (Teacher) object;
            MyTeacherHolaer holaer1= (MyTeacherHolaer) holaer;
            holaer1.teacher_name.setText(teacher.name);
            holaer1.teacher_age.setText(teacher.age+"");
        }
    }

    public class MyStudentHolaer extends ViewHolaer{
        public TextView student_name,student_age,student_time;
        public MyStudentHolaer(View view) {
            super(view);
            student_name= (TextView) view.findViewById(R.id.student_name);
            student_age= (TextView) view.findViewById(R.id.student_age);
            student_time= (TextView) view.findViewById(R.id.student_time);
        }
    }


  public class MyTeacherHolaer extends ViewHolaer{
        public TextView teacher_name,teacher_age;
        public MyTeacherHolaer(View view) {
            super(view);
            teacher_name= (TextView) view.findViewById(R.id.teache_name);
            teacher_age= (TextView) view.findViewById(R.id.teache_age);
        }
    }</span></strong>

<strong><span style="font-size:18px;">
</span></strong>

在Activity中实现多布局效果的代码：

public class ListViewActivity extends AppCompatActivity {
    private ListView listView;
    private List<Teacher>teachers=new ArrayList<>();
    private List<Student>students=new ArrayList<>();

    private List<Object>objects=new ArrayList<>();
    private final int Count=20;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_list_view);

        initView();
    }

    private void initView() {
        listView= (ListView) findViewById(R.id.listview);
        initData();//初始化数据源

        listView.setAdapter(new ObjectAdapter(objects));



    }

    private void initData() {

         for(int i=0;i< Count;i++){
             if(i%2==0){
            objects.add(new Teacher("杨钰莹"+(i+1)+"号",(i+1)));
             }else{
            objects.add(new Student("莫妮卡"+(i+1)+"号",(i+1)));
             }
        }


    }
}