问题陈述
我已尝试在论坛上发布与此问题相关的各种方法，但无法理解我的代码有什么问题。真的很感激任何指针来解决这个问题
我正在开发一个应用程序，在该应用程序中，基于某些选定值创建数据库查询，该数据库查询从数据库中获取相关行并在列表视图中显示它。除文本外，它还提供要与结果一起显示的图像文件的名称。图像文件存储在可绘制文件夹中，并随安装一起加载（无在线图像下载）。但是，在单击显示列表视图的按钮时，它会显示所获取数据和图像的重复记录。
我是Android和社区的新手，并且想在查询中添加如此多的文本而道歉
我的代码粘贴在
下面的活性 的
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class GiftResult extends Activity{
Bundle bundle;
ListView lv;
List<RowItem> rowitems;
DatabaseHelper dbhelp;
ListAdapter listadapter;
public void onCreate(Bundle savedInstanceState){
dbhelp = new DatabaseHelper(this);
dbhelp.addgift();
super.onCreate(savedInstanceState);
setContentView(R.layout.giftresult);
rowitems = new ArrayList<RowItem>();
ListView lv = (ListView)findViewById(R.id.giftlist);
ArrayList<RowItem> item = getdata();
listadapter = new ListAdapter(this,R.layout.list_row,item);
lv.setAdapter(listadapter);
listadapter.notifyDataSetChanged();
}
public ArrayList<RowItem> getdata(){
SQLiteDatabase db = dbhelp.getReadableDatabase();
bundle=this.getIntent().getExtras();
String relation = bundle.getString("relation");
String gender = bundle.getString("gender");
String occasion = bundle.getString("occasion");
String age = bundle.getString("age");
String TBL_NM_MSG = DatabaseHelper.TABLE_NAME;
String TBL_CLMN_IMAGE = DatabaseHelper.COLUMN_IMAGES;
String TBL_CLMN_GFT = DatabaseHelper.COLUMN_GIFT;
String TBL_CLMN_GFTDESC = DatabaseHelper.COLUMN_GIFTDESC;
String TBL_CLMN_GENDER = DatabaseHelper.COLUMN_GENDER;
String TBL_CLMN_RELATION = DatabaseHelper.COLUMN_RELATION;
String TBL_CLMN_OCCASION= DatabaseHelper.COLUMN_OCCASION;
String TBL_CLMN_AGE = DatabaseHelper.COLUMN_AGE;
ArrayList<RowItem> result = new ArrayList<RowItem>();
result.clear();
Cursor cur = db.rawQuery("SELECT " + TBL_CLMN_IMAGE +" ,"+ TBL_CLMN_GFT +" ,"+ TBL_CLMN_GFTDESC + " FROM " + TBL_NM_MSG
+" WHERE "+ TBL_CLMN_GENDER +" = '"+gender+"' AND "
+ TBL_CLMN_RELATION +" LIKE '%"+relation+"%' AND "
+ TBL_CLMN_OCCASION +" LIKE '%"+occasion+"%' AND "
+ TBL_CLMN_AGE +" LIKE '%"+age+"%';", null);
cur.moveToFirst();
while(cur.isAfterLast()== false){
String gift = cur.getString(cur.getColumnIndex(TBL_CLMN_GFT));
String giftdesc = cur.getString(cur.getColumnIndex(TBL_CLMN_GFTDESC));
String image = cur.getString(cur.getColumnIndex(TBL_CLMN_IMAGE));
int imageid = getResources().getIdentifier(image, "drawable", this.getPackageName());
RowItem item = new RowItem(imageid, gift, giftdesc) ;
if(result.contains(item)){
result.remove(item);
}
else
result.add(item);
cur.moveToNext();
}
cur.close();
return result;
}
}
Custome适配器
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class ListAdapter extends ArrayAdapter<RowItem> {
Context context;
public ListAdapter(Context context, int resourceId,
List<RowItem> items) {
super(context, resourceId, items);
// TODO Auto-generated constructor stub
this.context=context;
}
private class ViewHolder {
ImageView imageView;
TextView txtTitle;
TextView txtDesc;
}
public View getView(int position, View convertView,ViewGroup parent){
ViewHolder holder = null;
RowItem rowitem = getItem(position);
LayoutInflater mInflater = (LayoutInflater) context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.list_row, null);
holder = new ViewHolder();
holder.txtDesc = (TextView) convertView.findViewById(R.id.desc);
holder.txtTitle = (TextView) convertView.findViewById(R.id.title);
holder.imageView = (ImageView) convertView.findViewById(R.id.list_image);
convertView.setTag(holder);
} else
{
holder = (ViewHolder) convertView.getTag();
}
holder.txtDesc.setText(rowitem.getDesc());
holder.txtTitle.setText(rowitem.getTitle());
holder.imageView.setImageResource(rowitem.getImageId());
return convertView;
}
}
XML文件
<?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:padding="5dip"
android:background="@drawable/list_selector">
<!-- ListRow Left sied Thumbnail image -->
<LinearLayout android:id="@+id/thumbnail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="3dip"
android:layout_alignParentLeft="true"
android:layout_marginRight="5dip"
android:background="@drawable/image_bg">
<ImageView
android:id="@+id/list_image"
android:layout_width="100dip"
android:layout_height="100dip"/>
</LinearLayout>
<!-- Title Of Song-->
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/thumbnail"
android:layout_toRightOf="@+id/thumbnail"
android:textColor="#040404"
android:typeface="sans"
android:textSize="20dip"
android:textStyle="bold"/>
<!-- Description -->
<TextView
android:id="@+id/desc"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/title"
android:textColor="#343434"
android:textSize="16dip"
android:layout_marginTop="1dip"
android:layout_toRightOf="@+id/thumbnail"/>
<!--Rightend Duration -->
<TextView
android:id="@+id/duration"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignTop="@id/title"
android:gravity="right"
android:text="more.."
android:layout_marginRight="5dip"
android:textSize="18dip"
android:textColor="#10bcc9"
android:textStyle="bold"/>
</RelativeLayout>