我如何从一个片段到另一个片段的列表视图适配器进行事务

Posted 2023-05-07

【中文标题】我如何从一个片段到另一个片段的列表视图适配器进行事务

【英文标题】：How can i make transaction from a listview adapter from a fragment to another fragment

【发布时间】：2020-02-20 01:13:11

【问题描述】：

我有一个在片段中实现的列表视图。我想在单击一个项目的那一刻转换到详细信息片段，并且我想在另一个片段中显示详细信息，其中我有该图像的一个图像视图和名称、价格和详细信息的 3 个文本视图。我尝试了几种变体，但都没有成功。非常感谢

items.java

public class items 

    // Name of the object
    private String lName;

    // Costs
    private String lPrice;

    // Details
    private String lDetails;

    // Image resource id
    private int lImageId;

    // Constructor
    public items(String ObjectName,String ObjectPrice,int ImageResourceId,String DetailsItem)
        lName=ObjectName;
        lPrice=ObjectPrice;
        lImageId=ImageResourceId;
        lDetails=DetailsItem;

    

    // Getters
    public String getlName()  return lName; 
    public String getlPrice() return lPrice; 
    public int getlImageId() return lImageId; 
    public String getlDetails()  return lDetails; 

    

itemsAdapter.java

public class itemsAdapter extends ArrayAdapter<items>

    private static final String LOG_TAG = itemsAdapter.class.getSimpleName();

    /**
     * This is our own custom constructor (it doesn't mirror a superclass constructor).
     * The context is used to inflate the layout file, and the list is the data we want
     * to populate into the lists.
     */
    public itemsAdapter(Activity context, ArrayList<items> item)
        super(context,0,item);
    

    //Provides a view for an AdapterView (ListView, GridView, etc.)
    public View getView(int position, View convertView, ViewGroup parent)
        // Check if the existing view is being reused, otherwise inflate the view
        View listItemView = convertView;
        if(listItemView == null) 
            listItemView = LayoutInflater.from(getContext()).inflate(
                    R.layout.list_item, parent, false);
        

        // Get the object located at this posiiton in the list
        items currentItems=getItem(position);

        // Find the TextView in the list_item.xml layout with the id name_items
        TextView nameTextView=(TextView)listItemView.findViewById(R.id.name_item);

        // Get the name from the current items object and set this text on the name TextView
        nameTextView.setText(currentItems.getlName());

        // Find the TextView in the list_item.xml layout with the id price_items
        TextView priceTextView=(TextView)listItemView.findViewById(R.id.price_item);

        // Get the price from the current items object and set this text on the price TextView
        priceTextView.setText(currentItems.getlPrice());

        // Find the ImageView in the list_item.xml layout with the id icon_item
        ImageView iconImageView=(ImageView)listItemView.findViewById(R.id.icon_item);

        // Get the image from the current items object and set this image on the image view
        iconImageView.setImageResource(currentItems.getlImageId());


        // Find the TextView in the list_item.xml layout with the id details_item
        TextView detailsView=(TextView)listItemView.findViewById(R.id.details_item);

        // Get the details from the current items object and set this text on the details TextView
        detailsView.setText(currentItems.getlDetails());

        return listItemView;
    

list_item.xml

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_
    android:layout_
    android:gravity="center_vertical"
    android:minHeight="?android:attr/listPreferredItemHeight"
    android:orientation="horizontal"
    android:padding="16dp">

    <ImageView
        android:id="@+id/icon_item"
        android:layout_
        android:layout_ />

    <LinearLayout
        android:layout_
        android:layout_
        android:layout_weight="1"
        android:orientation="vertical"
        android:paddingLeft="16dp">

        <TextView
            android:layout_
            android:layout_
            android:text="Name"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/name_item"
            android:layout_
            android:layout_ />

        <TextView
            android:layout_
            android:layout_
            android:text="Price"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/price_item"
            android:layout_
            android:layout_ />

    </LinearLayout>

    <LinearLayout
        android:layout_
        android:layout_
        android:layout_weight="1"
        android:orientation="vertical"

        >

        <TextView
            android:layout_
            android:layout_
            android:text="Details"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/details_item"
            android:layout_
            android:layout_ />

    </LinearLayout>

</LinearLayout>


beds_fragment.xml


    <ListView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/listview_beds"
    android:layout_
    android:layout_
    android:layout_gravity="bottom"
    android:background="#e3e3e3"
    />

bedsFragment.java

public class bedsFragment extends Fragment 

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 

        View view = inflater.inflate(R.layout.beds_fragment, container, false);


        // Create an ArrayList of items objects
        ArrayList<items> beds=new ArrayList<items>();
        beds.add(new items("Bed1","23$",R.drawable.bed1,"Beds for sleeping well, best buy if you want to sleep."));
        beds.add(new items("Bed2","43$",R.drawable.bed2,"Beds for sleeping well, best buy if you want to sleep."));
        beds.add(new items("Bed3","54$",R.drawable.bed3,"Beds for sleeping well, best buy if you want to sleep."));
        beds.add(new items("Bed4","34$",R.drawable.bed4,"Beds for sleeping well, best buy if you want to sleep."));
        beds.add(new items("Bed5","65$",R.drawable.bed5,"Beds for sleeping well, best buy if you want to sleep."));

        // Create an @link itemsAdapter, whose data source is a list of @items. The adapter
        // know how to create a list item views for each item in the list

        itemsAdapter itAdapter=new itemsAdapter(this.getActivity(),beds);

        // Get a reference to the ListView, and attach the adapter to the listView
        ListView listView=(ListView)view.findViewById(R.id.listview_beds);
        listView.setAdapter(itAdapter);

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() 
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) 

                FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
                fragmentTransaction.replace(R.id.listview_beds, new storeFragment());
                fragmentTransaction.addToBackStack(null).commit();
            
        );


        return view;
    

    

detailsFragment.java

public class detailsFragment extends Fragment 
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 

    View view = inflater.inflate(R.layout.details_fragment, container, false);
    return view;
  

【参考方案1】：

您好，您可以使用以下代码。

首先一个接口创建成适配器类和First Fragment实现接口。

接口有一个回调方法。所以当用户点击列表项时，下面的方法

@覆盖 回调（）

进入第一个片段。

转换代码右下方的内部回调方法。

 FragmentTransaction fragmentTransaction = getSupportFragmentManager()
                    .beginTransaction();
    Fragment profileFragment = new MovieDetailFragment();//the fragment you want to show
    profileFragment.setArguments(bundle);
    fragmentTransaction
        .replace(R.id.content_frame, profileFragment);//R.id.content_frame is the layout you want to replace
    fragmentTransaction.addToBackStack(null);
    fragmentTransaction.commit();

【讨论】：

公共类 itemsAdapter 扩展 ArrayAdapter public interface transitionInterface void callback();

这是接口，我实现了，“实现 itemsAdapter.transitionInterface

public void callback() FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction(); Fragment profileFragment = new detailsFragment();//你要展示的片段 //profileFragment.setArguments(bundle); fragmentTransaction.replace(R.id.beds_category, profileFragment); fragmentTransaction.addToBackStack(null); fragmentTransaction.commit();

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() @Override public void onItemClick(AdapterView> parent, View view, int position, long id) callback(); );

当我点击时，我的应用程序崩溃