Android:定制化CursorAdapter，简洁版

最新推荐文章于 2023-06-27 19:08:24 发布

Erwin_H

最新推荐文章于 2023-06-27 19:08:24 发布

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本文介绍如何在Android中实现自定义的CursorAdapter，用于ListView，以展示数据库中不同字段之间的关系。

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转自：http://blog.cluepusher.dk/2009/11/16/creating-a-custom-cursoradapter-for-android/

I’ve been writing a bit more Android code, and came upon the need to write a custom CursorAdapter for aListView, as the way I wanted to display data from a Cursor was dependent on relationships between different fields of the database.

Of the problems I encountered, the most obvious was when I tried to inflate views using View.inflate(), and found I would get the following error:

UnsupportedOperationException: addView(View, LayoutParams)
is not supported in AdapterView at android.widget.AdapterView

After a bit of rummaging around, I found that the following bit of code would work when attached to a ListView using setAdapter().

public class ExampleCursorAdapter extends CursorAdapter {
	public ExampleCursorAdapter(Context context, Cursor c) {
		super(context, c);
	}
 
	@Override
	public void bindView(View view, Context context, Cursor cursor) {
		TextView summary = (TextView)view.findViewById(R.id.summary);
		summary.setText(cursor.getString(
				cursor.getColumnIndex(ExampleDB.KEY_EXAMPLE_SUMMARY)));
	}
 
	@Override
	public View newView(Context context, Cursor cursor, ViewGroup parent) {
		LayoutInflater inflater = LayoutInflater.from(context);
		View v = inflater.inflate(R.layout.item, parent, false);
		bindView(v, context, cursor);
		return v;
	}
}

The above example code doesn’t actually require a CursorAdapter, it would easily be implemented using aSimpleCursorAdapter, but it serves to show the idea. Basicly, get a LayoutInflater from the context, and use the version of inflate() that does not attach to the root view.

Tags: Android, Java