嗨我试图在列表视图中显示文本,图像。要将内容加载到我的列表视图中,我有三种情况。Android:ListView滚动后无法正常工作
1.有时我只能从json获得文本。所以,在这种情况下,我必须隐藏ImageView
2.某些情况下,我只能从json获取图像url。所以,在这种情况下,我不得不隐藏的TextView
在其他情况下,我正从JSON两个图像的URL和文字,所以,在这种情况下,我没有隐瞒什么
通过遵循这些场景,我在第一时间正确加载所有内容,但是当我从上到下滚动和从下往上滚动时。所有图像视图都充满了图像(但对于特定的位置没有图像URL)
我的适配器代码是
package com.app.listviewitemid.adapter;
import java.util.ArrayList;
import com.app.listviewitemid.R;
import com.app.listviewitemid.model.Items;
import com.bumptech.glide.Glide;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
public class ItemsAdapter extends ArrayAdapter<Items>{
ArrayList<Items> itemsArrayList;
int Resource;
LayoutInflater inflater;
Context context;
ViewHolder holder;
Button btnCheck;
Items globPosition;
public ItemsAdapter(Context context, int resource, ArrayList<Items> objects){
super(context, resource, objects);
this.context = context;
this.Resource = resource;
this.itemsArrayList = objects;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if(v == null){
v = inflater.inflate(Resource, null);
holder = new ViewHolder();
holder.tvPostID = (TextView) v.findViewById(R.id.tv_post_id);
holder.tvPostText = (TextView) v.findViewById(R.id.tv_post_text);
holder.ivPostImage = (ImageView) v.findViewById(R.id.iv_post_img);
btnCheck = (Button) v.findViewById(R.id.btn_check);
v.setTag(holder);
}else{
holder = (ViewHolder) v.getTag();
}
globPosition = itemsArrayList.get(position);
holder.tvPostID.setText(itemsArrayList.get(position).getPostID());
if(globPosition.getPostText().equals(null) || globPosition.getPostText().equals("")){
}else {
holder.tvPostText.setText(globPosition.getPostText());
}
if(globPosition.getPostImage().equals(null) || globPosition.getPostImage().equals("")){
}else {
Glide.with(context).load(globPosition.getPostImage()).placeholder(R.drawable.loading_img).error(R.drawable.bg_480_800).into(holder.ivPostImage);
}
btnCheck.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Log.e("PostID", globPosition.getPostID());
}
});
return v;
}
static class ViewHolder{
TextView tvPostID;
TextView tvPostText;
ImageView ivPostImage;
}
}
适配器布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/tv_post_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/post_id"
android:textColor="#000000"
android:textSize="12sp" />
<TextView
android:id="@+id/tv_post_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#000000"
android:textSize="12sp" />
<ImageView
android:id="@+id/iv_post_img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="@string/empty" />
<Button
android:id="@+id/btn_check"
android:layout_width="match_parent"
android:layout_height="35dp"
android:background="#000000"
android:text="@string/check"
android:textColor="#FFFFFF" />
</LinearLayout>
如何获得摆脱这个?
u可以使用globPosition itemsArrayList。获取(位置)或本地声明globPosition –