Question

是否有可能检查在ListView项中单击的视图是什么？
换句话说，当您在ListView项目应用内单击不同的视图时，应用应执行不同的操作。
详细地说，我有一个简单的Book.java类，其中包含一些书籍描述。
然后，我使用ListView<Book>创建BooksAdapter.class：

public class BooksAdapter extends ArrayAdapter<Book> {
    public BooksAdapter (Context context, List<Book> books) {
        super(context,0,books);
    }
    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

//        ConstraintLayout constraintLayout = new ConstraintLayout();
//        constraintLayout.setVisibility();
        View listItemView = convertView;
        if (listItemView == null) {
            listItemView = LayoutInflater.from(getContext()).inflate(
                    R.layout.books_list_item, parent, false);
        }
        Book currentBook = getItem(position);
        ImageView coverView = (ImageView) listItemView.findViewById(R.id.preview_image_view);
        if (currentBook.getImage() == "No cover") {
            coverView.setImageResource(R.drawable.no_book_cover);
        } else {
            Picasso.get().load(currentBook.getImage()).into(coverView);
        }
        TextView authorTextView = (TextView)listItemView.findViewById(R.id.autor_text);
        authorTextView.setText(formatAuthor(currentBook.getAuthor(),currentBook.getDate()));
        TextView titleTextView = (TextView)listItemView.findViewById(R.id.title_text);
        titleTextView.setText(currentBook.getTitle());
        //TextView descrTextView = (TextView)listItemView.findViewById(R.id.description_text);
        //descrTextView.setText(currentBook.getDescription());
        return listItemView;
    }

    private String formatAuthor (String name,String date ) {
        name = name.substring(2,name.length()-2);
        date = date.substring(0,4);
        String fullString = name + ", " + date;
        return(fullString);
    }
}

books_list_item.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/list_item"
        android:layout_width="match_parent"
        android:layout_height="120dp"
        android:orientation="horizontal"
        android:paddingEnd="16dp"
        android:paddingLeft="16dp"
        android:paddingRight="16dp"
        android:paddingStart="16dp"
        android:paddingBottom="16dp"
        android:paddingTop="8dp">
        <ImageView
            android:id="@+id/preview_image_view"
            android:layout_width="80dp"
            android:layout_height="match_parent" />
        <LinearLayout
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="match_parent"
            android:orientation="vertical">
            <TextView
                android:id="@+id/autor_text"
                android:layout_width="match_parent"
                android:layout_height="40dp"
                android:maxLines="1"
                android:paddingLeft="8dp"
                android:paddingRight="8dp"
                android:paddingTop="8dp"
                android:textColor="@color/textColorPrimary"
                android:textSize="16sp" />
            <TextView
                android:id="@+id/title_text"
                android:layout_width="match_parent"
                android:layout_height="80dp"
                android:layout_gravity="center_vertical"
                android:maxLines="2"
                android:paddingLeft="8dp"
                android:paddingRight="8dp"
                android:paddingTop="0dp"
                android:textColor="@color/textColorLight"
                android:textSize="16sp" />
        </LinearLayout>
        <ImageView
            android:layout_width="40dp"
            android:layout_height="match_parent"
            android:src="@drawable/ic_info_black_24dp"
            android:scaleType="center"/>
    </LinearLayout>
    <View
        android:layout_width="match_parent"
        android:layout_height="0.5dp"
        android:background="@android:color/darker_gray"/>
</LinearLayout>

在MainActivity.java中创建mAdapter并覆盖setOnItemClickListener：

   ListView booksListView = (ListView) findViewById(R.id.list);
    mAdapter = new BooksAdapter(this, new ArrayList<Book>());
    booksListView.setAdapter(mAdapter);

    booksListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
            Book book = mAdapter.getItem(position);

            ad = new AlertDialog.Builder(BooksListActivity.this);
            ad.setTitle("Book description");
            ad.setMessage(book.getDescription());

            AlertDialog alert = ad.create();
            alert.show();
            //ad.create();
        }
    });

这是一些常见的问题，我们可以在项目内部的不同onClickListeners（例如Views和@+id/autor_text）上设置@+id/title_text并在这些情况下执行不同的操作吗？ br /> 我正在阅读关于这几个地方的信息，但找不到任何有用的东西。谢谢您的帮助。

Answer 1

在您的getView()方法内部，将onClickListener设置为所有不同的Views并执行各自的操作。

通过实现以下代码：-

authorTextView.setOnClickListener(this);
titleTextView.setOnClickListener(this);  

public void onClick(View v) {

      switch(v.getId()){  
           case R.id.authorTextView:  
                //code to be written to handle the click event
           break;

           case R.id.titleTextView: 
                //code to be written to handle the click event 
           break;
      }
    }
};

Answer 2

在您的getView

内部

    authorTextView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            //Do your action
        }
    });


    titleTextView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            //Do your action
        }
    });

如何在ListView项目的视图上添加不同的OnClickListeners以执行不同的操作

2 个答案: