Andriod中的数据绑定：SimpleCursorAdapter篇

最新推荐文章于 2025-08-08 23:51:41 发布

weixin_33805557

最新推荐文章于 2025-08-08 23:51:41 发布

阅读量118

点赞数

文章标签：移动开发数据库 ui

本文详细介绍了SimpleCursorAdapter的构造方法及使用方式，包括如何通过参数设置数据与UI间的绑定关系，以及如何使用ViewBinder自定义数据绑定过程。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

public SimpleCursorAdapter(Context context, int layout, Cursor c, String[] from, int[] to, int flags)

Since: API Level 11

Standard constructor.

Parameters

context	The context where the ListView associated with this SimpleListItemFactory is running
layout	resource identifier of a layout file that defines the views for this list item. The layout file should include at least those named views defined in "to"
c	The database cursor. Can be null if the cursor is not available yet.
from	A list of column names representing the data to bind to the UI. Can be null if the cursor is not available yet.
to	The views that should display column in the "from" parameter. These should all be TextViews. The first N views in this list are given the values of the first N columns in the from parameter. Can be null if the cursor is not available yet.
flags	Flags used to determine the behavior of the adapter, as per `CursorAdapter(Context, Cursor, int)`.

SimpleCursorAdapter.ViewBinder

This class can be used by external clients of SimpleCursorAdapter to bind values fom the Cursor to views. You should use this class to bind values from the Cursor to views that are not directly supported by SimpleCursorAdapter or to change the way binding occurs for views supported by SimpleCursorAdapter.

public abstract boolean setViewValue (View view, Cursor cursor, int columnIndex)

Since: API Level 1

Binds the Cursor column defined by the specified index to the specified view. When binding is handled by this ViewBinder, this method must return true. If this method returns false, SimpleCursorAdapter will attempts to handle the binding on its own.

Parameters

view	the view to bind the data to
cursor	the cursor to get the data from
columnIndex	the column at which the data can be found in the cursor

Returns

true if the data was bound to the view, false otherwise

Cursor要实现AbstractCursor

public boolean setViewValue(View view, Cursor cursor, int columnIndex)
    {
        MyCursor = (MyCursor) cursor;
        MyFavorite fav = cur.getBean();


         switch (view.getId())
    {
         case R.id.A_name:

            TextView nView = (TextView) view;
                String name = fav.getName()
                nView.setText(name);
        case R.id.B_name:
       ImageView imageView = (ImageView) view;
       imageView.setVisibility(View.VISIBLE);
       imageView.setImageResource(R.drawable.icon1)
    ....






     }
        Return true

    }

Public Methods

public void bindView(View view, Context context, Cursor cursor)

Since: API Level 1

Binds all of the field names passed into the "to" parameter of the constructor with their corresponding cursor columns as specified in the "from" parameter. Binding occurs in two phases. First, if a SimpleCursorAdapter.ViewBinder is available, setViewValue(android.view.View, android.database.Cursor, int) is invoked. If the returned value is true, binding has occured. If the returned value is false and the view to bind is a TextView, setViewText(TextView, String) is invoked. If the returned value is false and the view to bind is an ImageView, setViewImage(ImageView, String) is invoked. If no appropriate binding can be found, an IllegalStateException is thrown.

Parameters

view	Existing view, returned earlier by newView
context	Interface to application's global information
cursor	The cursor from which to get the data. The cursor is already moved to the correct position.