如何创建自定义光标适配器列表视图与图像和文字的使用？ [英] how do i create a custom cursor adapter for a listview for use with images and text?

问题描述

喜想创建一个自定义光标适配器，这样我就可以用2行文字显示图像。 我有一些很难理解的定义光标适配器，但我不知道如何添加的ImageView从路径在我的数据库填补。

Hi want to create a custom cursor adapter so I can display an image with 2 lines of text. I have had some trouble understanding the custom cursor adapters but I do not understand how to add an imageview to be filled from the path in my database.

推荐答案

请问，

其实我已经实现令人难以置信的东西类似于你在找什么。下面是我的实现。

I've actually implemented something incredibly similar to what you are looking for. Here is my implementation.

import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.Resources;
import android.database.Cursor;
import android.preference.PreferenceManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CursorAdapter;
import android.widget.ImageView;
import android.widget.TextView;


public class ItemAdapter extends CursorAdapter {
    private LayoutInflater mLayoutInflater;
    private Context mContext;
    public ItemAdapter(Context context, Cursor c) {
        super(context, c);
        mContext = context;
        mLayoutInflater = LayoutInflater.from(context); 
    }

    @Override
    public View newView(Context context, Cursor cursor, ViewGroup parent) {
        View v = mLayoutInflater.inflate(R.layout.items_row, parent, false);
        return v;
    }

    /**
     * @author will
     * 
     * @param   v
     *          The view in which the elements we set up here will be displayed.
     * 
     * @param   context
     *          The running context where this ListView adapter will be active.
     * 
     * @param   c
     *          The Cursor containing the query results we will display.
     */

    @Override
    public void bindView(View v, Context context, Cursor c) {
        String title = c.getString(c.getColumnIndexOrThrow(ItemDbAdapter.KEY_TITLE));
        String date = c.getString(c.getColumnIndexOrThrow(ItemDbAdapter.KEY_DATE));
        String imagePath = c.getString(c.getColumnIndexOrThrow(ItemDbAdapter.KEY_IMG));
        int deletion = c.getInt(c.getColumnIndexOrThrow(ItemDbAdapter.KEY_DELETION));
        int priority = c.getInt(c.getColumnIndexOrThrow(ItemDbAdapter.KEY_PRIORITY));

        /**
         * Next set the title of the entry.
         */

        TextView title_text = (TextView) v.findViewById(R.id.item_text);
        if (title_text != null) {
            title_text.setText(title);
        }

        /**
         * Set Date
         */

        TextView date_text = (TextView) v.findViewById(R.id.item_date);
        if (date_text != null) {
            date_text.setText(date);
        }       

        /**
         * Decide if we should display the paper clip icon denoting image attachment
         */

        ImageView item_image = (ImageView) v.findViewById(R.id.item_attachment);
        item_image.setVisibility(ImageView.INVISIBLE);
        if (imagePath != null && imagePath.length() != 0 && item_image != null) {
            item_image.setVisibility(ImageView.VISIBLE);
        }

        /**
         * Decide if we should display the deletion indicator
         */
        ImageView del_image = (ImageView) v.findViewById(R.id.item_deletion);
        del_image.setVisibility(ImageView.INVISIBLE);
        if (deletion == 1) {
            del_image.setVisibility(ImageView.VISIBLE);
        }
    }
}

XML只是柜面...

XML just incase...

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:background="@drawable/list_bg">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView android:id="@+id/item_text"
            android:layout_width="200dp"
            android:layout_height="wrap_content"
            android:lines="1"
            android:scrollHorizontally="true"
            android:ellipsize="end"
            android:paddingLeft="2sp"
            android:paddingTop="2sp"
            android:textSize="18sp"
            android:textStyle="bold"
            android:shadowColor="#90909090"
            android:shadowDx="1.0"
            android:shadowDy="1.0"
            android:shadowRadius="1.0"/>

        <TextView android:id="@+id/item_date"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="12sp"
            android:textColor="#FF808080"
            android:paddingLeft="2sp"
            android:paddingTop="2sp"/>
    </LinearLayout>

    <ImageView android:id="@+id/item_deletion"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/deletion"
        android:visibility="invisible"
        android:layout_centerVertical="true"
        android:layout_alignParentRight="true"
        android:paddingRight="5sp"/>

    <ImageView android:id="@+id/item_attachment"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/attachment"
        android:visibility="invisible"
        android:layout_centerVertical="true"
        android:layout_toLeftOf="@id/item_deletion"/>

</RelativeLayout>

这显示两行文字和最多2图像，根据某些条件的文字的权利。

This displays two rows of text and up to 2 images to the right of the text depending on certain conditions.

我希望这可以给你一个基础，从工作！

I hope this can give you a basis to work from!

祝：]

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