您好想创建一个自定义光标适配器，这样我就可以显示带有 2 行文本的图像。我在理解自定义光标适配器时遇到了一些麻烦，但我不明白如何添加要从数据库中的路径填充的图像视图。
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20723 次
4 回答
32
将要，
我实际上已经实现了与您正在寻找的非常相似的东西。这是我的实现。
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只是以防万一...
<?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>
这将根据特定条件在文本右侧显示两行文本和最多 2 个图像。
我希望这可以给你一个工作的基础！
祝你好运 ：]
于 2011-03-14T15:40:44.983 回答
1
添加图像和文本并不特定于CursorAdapter; 您对任何类型的适配器都使用相同的技术。您可以为您的行创建一个布局并在您的getView方法中对其进行扩展。包含在 Android SDK文件夹中的APIDemosandroid-sdk-PLATFORM/samples/android-XY/ApiDemos示例项目可以满足您的需求。您可以在 中找到行定义 list_item_icon_text.xml。这是文件内容的副本（无许可证）。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView android:id="@+id/icon"
android:layout_width="48dip"
android:layout_height="48dip" />
<TextView android:id="@+id/text"
android:layout_gravity="center_vertical"
android:layout_width="0dip"
android:layout_weight="1.0"
android:layout_height="wrap_content" />
</LinearLayout>
于 2011-03-14T15:42:10.943 回答
1
检查我做了什么：顺便说一句：CheckpointsView.getImageResId()返回一个有效的可绘制参考
public class CheckpointCursorAdapter extends ResourceCursorAdapter {
private int layoutType = 0;
public static final int BLOTTER = 1;
public static final int DAY = 2;
public static final int MONTH = 3;
public static final int OVERVIEW = 4;
public static final int LAYOUT_ID = R.layout.checkpoint_row;
public CheckpointCursorAdapter(Context context, int layoutType, Cursor cursor) {
super(context, LAYOUT_ID, cursor);
this.layoutType = layoutType;
}
@Override
public View newView(Context context, Cursor cur, ViewGroup parent) {
LayoutInflater li = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
return li.inflate(LAYOUT_ID, parent, false);
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
TextView tvListText = (TextView) view.findViewById(R.id.txtCheckPoint);
Date dt = new Date(cursor.getLong(cursor.getColumnIndex(DatabaseHelper.KEY_CHECKPOINT)));
switch (layoutType) {
case BLOTTER:
tvListText.setText(dt.toLocaleString());
((ImageView) view.findViewById(R.id.imgCheckpointInOut))
.setImageResource(CheckpointsView.getImageResId(cursor.getCount()
- cursor.getPosition()));
break;
case DAY:
tvListText.setText(new SimpleDateFormat("HH:mm:ss").format(dt));
((ImageView) view.findViewById(R.id.imgCheckpointInOut))
.setImageResource(CheckpointsView.getImageResId(cursor.getPosition() + 1));
break;
case MONTH:
tvListText.setText(new SimpleDateFormat("MMM dd HH:mm:ss").format(dt));
((ImageView) view.findViewById(R.id.imgCheckpointInOut))
.setImageResource(CheckpointsView.getImageResId(cursor.getPosition() + 1));
break;
case OVERVIEW:
break;
}
}
}
和 XML 以防万一
<?xml version="1.0" encoding="utf-8"?>
<TextView android:id="@+id/txtCheckPoint"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:textSize="20dp" android:padding="8dp" android:textStyle="bold">
</TextView>
<LinearLayout android:layout_width="fill_parent"
android:layout_height="wrap_content" android:orientation="horizontal"
android:gravity="right" android:layout_weight="1"
android:layout_marginRight="8px">
<TextView android:id="@+id/txtTotalHours"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:textSize="20dp" android:padding="8dp" android:paddingRight="12dp">
</TextView>
<TextView android:id="@+id/txtHourBalanceRow"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:textSize="12dp" android:padding="8dp">
</TextView>
<ImageView android:id="@+id/imgCheckpointInOut"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:src="@drawable/black_clock" />
</LinearLayout>
您可以在以下位置查看整个代码： http ://code.google.com/p/droidtimesheet/
于 2011-03-14T16:05:10.350 回答
0
这是我以前用来帮助自定义列表适配器的一个很棒的教程。听起来它正在做你想做的完全相同的事情。本教程展示了如何使用图像和两行文本构建自定义列表适配器。
于 2011-03-14T15:40:59.620 回答