安卓ListView自定義Adapter
阿新 • • 發佈:2018-11-25
list.xml
<ListView
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
item.xml
<TextView android:id="@+id/name" android:layout_width="100dp" android:layout_height="match_parent" app:layout_constraintRight_toLeftOf="@+id/price"/> <TextView android:id="@+id/price" android:layout_width="100dp" android:layout_height="match_parent" app:layout_constraintLeft_toRightOf="@+id/name"/>
Book.java
public class Book { private String bookName; private String bookPrice; public Book(String bookName, String bookPrice) { this.bookName = bookName; this.bookPrice = bookPrice; } public String getBookName() { return bookName; } public String getBookPrice() { return bookPrice; } public void setBookName(String bookName) { this.bookName = bookName; } public void setBookPrice(String bookPrice) { this.bookPrice = bookPrice; } }
list.java
List<Book> data = new ArrayList<>(); for(int i = 0; i < 3; i++) { Book b = new Book("book","100"); data.add(b); } ListView listview = (ListView) findViewById(R.id.listview); MyListViewAdapter t = new MyListViewAdapter(this, data); listview.setAdapter(t);
MyListViewAdapter.java
public class MyListViewAdapter extends BaseAdapter {
private List<Book> list;
LayoutInflater inflater;
public MyListViewAdapter(Context context, List<Book> list) {
this.list = list;
inflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
if (list == null) {
return 0;
}
return list.size();
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public Object getItem(int i) {
if (list == null) {
return null;
}
return list.get(i);
}
@Override
public View getView(int i, View convertView, ViewGroup viewGroup) {
ViewHolder viewHolder;
// 當view為空時才載入佈局,否則,直接修改內容
if (convertView == null) {
// 通過inflate的方法載入佈局,context需要在使用這個Adapter的Activity中傳入。
convertView = inflater.inflate(R.layout.item, null);
viewHolder = new ViewHolder();
viewHolder.bookName = (TextView) convertView.findViewById(R.id.name);
viewHolder.bookPrice = (TextView) convertView.findViewById(R.id.price);
convertView.setTag(viewHolder); // 用setTag方法將處理好的viewHolder放入view中
} else { // 否則,讓convertView等於view,然後從中取出ViewHolder即可
viewHolder = (ViewHolder) convertView.getTag();
}
// 從viewHolder中取出對應的物件,然後賦值給他們
viewHolder.bookName.setText(list.get(i).getBookName());
viewHolder.bookPrice.setText(list.get(i).getBookPrice());
// 將這個處理好的view返回
return convertView;
}
private class ViewHolder {
public TextView bookName;
public TextView bookPrice;
}
}