问题描述
什么是检索绘制图像的最佳方式
文件夹中,而这些图片的名称都存储在 DB
,并显示在一个的ListView
?
What is the best way to retrieve images from drawable
folder while the name of those images are stored in a DB
and show them in a listView
?
假设我在绘制
文件夹三张照片,他们的名字都存储在数据库为:
Suppose i have three pictures in drawable
folder and their names are stored in DB as:
-
pic1.jpeg
pic1.jpeg
image2.jpeg
image2.jpeg
我也有一个名为方法 getAllimages()
其中i检索图像名称并返回它们作为一个光标
从DB:
I also have a method called getAllimages()
where i retrieve image names and return them as a Cursor
from DB:
public Cursor getAllImages(){
String sql = "SELECT iId as _id," + COLUMN_IMG_DESC + "," + COLUMN_IMG_NAME + " FROM " + TABLE_NAME";
Cursor cursor = db.rawQuery(sql, null);
if(cursor != null)
cursor.moveToFirst();
return cursor;
}
其中, COLUMN_IMG_DESC
是图片说明
和 COLUMN_IMG_NAME
是存储在数据库中的图像的名称
Where COLUMN_IMG_DESC
is an image description
and COLUMN_IMG_NAME
is the name of the image
stored in DB
然后我有一个的CursorAdapter
,其中我试图地图图片及其说明到的ListView
:
Then i have a CursorAdapter
where i tried to map images and their descriptions to a listView
:
ListView customListView = (ListView)findViewById(R.id.lvCustom);
String[] from = { DatabaseHelper.COLUMN_IMG_DESC, DatabaseHelper.COLUMN_IMG_NAME};
int[] to = {R.id.ivImg, R.id.tvTitle};
SimpleCursorAdapter cursorAdapter = new SimpleCursorAdapter(this, R.layout.custom_listview, cursor, from, to, 0);
cursorAdapter.setViewBinder(new SimpleCursorAdapter.ViewBinder() {
@Override
public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
ImageView imageImageView = (ImageView)findViewById(R.id.ivImg);
String imageValue = cursor.getString(1); //get image names
int[] imgResourceIds = new int[cursor.getColumnCount()]; //initialize array for resource Ids
String images[] = new String[cursor.getColumnCount()]; //initialize an array for image names
for(int i=0; i<cursor.getColumnCount(); i++){
images[i] = imageValue; //store image names to an initialized array
imgResourceIds[i] = getResources().getIdentifier(images[i], "drawable", packageName); //get image name
imageImageView.setImageResource(imgResourceIds[i]); //set image to imageView
}
return true;
}
});
customListView.setAdapter(cursorAdapter);
但我得到了这样的结果:我怎么晒黑解决这个问题?
but i got this result: How tan i solve this?
在此先感谢:)
推荐答案
好吧,问题是,我被分配我的适配器布局参数的错误。取而代之的 ListView_Row 我指着的ListView 本身
Ok the problem was that i was assigning my Adapter Layout Parameter wrong. Instead of ListView_Row i was pointing to ListView itself
所以:
SimpleCursorAdapter cursorAdapter = new SimpleCursorAdapter(this, R.layout.custom_listview, cursor, from, to, 0);
是:
SimpleCursorAdapter cursorAdapter = new SimpleCursorAdapter(this, R.layout.custom_listview_row, cursor, from, to, 0);
这篇关于在动态列表视图通过检索图像名来自Android的数据源设置图像的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!