您好,我想创建一个自定义光标适配器,以便我可以显示2行文字的图像。我在理解自定义光标适配器时遇到了一些问题,但我不知道如何添加要从我的数据库中的路径填充的图像视图。
发布于 2011-03-14 23:40:45
将要,
实际上,我已经实现了一些与您正在寻找的东西非常相似的东西。下面是我的实现。
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只是大小写...
<?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的右侧显示两行文本和最多两个图像。
我希望这能给你一个工作的基础!
祝你好运:]
发布于 2011-03-15 00:05:10
检查我所做的: BTW:CheckpointsView.getImageResId()
返回一个有效的可绘制引用
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>
你可以在http://code.google.com/p/droidtimesheet/上查看整个代码。
发布于 2011-03-14 23:41:00
这是一个很棒的tutorial,我以前使用过它来帮助我的自定义列表适配器。听起来它正在做和你想做的完全一样的事情。本教程展示了如何使用一个图像和两行文本构建自定义列表适配器。
https://stackoverflow.com/questions/5300787
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