1
我有一个列表视图，上面有一个搜索EditText。列表视图中的每一行都由几个文本和图片组成。当用户在搜索EditText中输入关键字时，我希望用包含关键字的行更新列表视图。我已经借用this的实现如下。使用自定义适配器在ListView中搜索关键字
我的自定义适配器：
public class CustomAdapter extends BaseAdapter implements Filterable {
private LayoutInflater inflater;
private ArrayList<CustomObject> objects;//mOriginalValues
private Activity activity;
private ArrayList<Bitmap> newsImageList;
private Context context;
private ArrayList<CustomObject> filteredObjects; // Values to be displayed after filtering
private class ViewHolder {
TextView titleTextView;
TextView dateTextView;
TextView bodyTextView;
ImageView logoView;
ImageView newsImageView;
ProgressBar progressBar;
}
public CustomAdapter(Context context, ArrayList<CustomObject> objects, Activity activity) {
// super(context, R.layout.news_item, objects);
inflater = LayoutInflater.from(context);
this.objects = objects;
this.filteredObjects=objects;
this.activity= activity;
this.newsImageList= new ArrayList<Bitmap>();
this.context= context;
for(int i=0; i<objects.size(); i++)
newsImageList.add(null);
}
@Override
public int getCount() {
return filteredObjects.size();
}
@Override
public CustomObject getItem(int position) {
return filteredObjects.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
System.out.println("IN GET VIEW");
ViewHolder holder = null;
if(convertView == null) {
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.news_item, null);
holder.titleTextView = (TextView) convertView.findViewById(R.id.txtTitle);
holder.dateTextView = (TextView) convertView.findViewById(R.id.txtDate);
holder.bodyTextView = (TextView) convertView.findViewById(R.id.txtBody);
holder.logoView= (ImageView) convertView.findViewById(R.id.source_imageView);
holder.newsImageView= (ImageView) convertView.findViewById(R.id.news_imageView);
holder.progressBar= (ProgressBar) convertView.findViewById(R.id.img_progress_bar);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.titleTextView.setText(objects.get(position).getTitle());
holder.dateTextView.setText(objects.get(position).getDate());
holder.bodyTextView.setText(objects.get(position).getBody());
//for the source logo
String uri = "@drawable/"+objects.get(position).getSource_logo()+"_logo";
int imageResource = activity.getResources().getIdentifier(uri, null, activity.getPackageName());
Drawable res =activity.getResources().getDrawable(imageResource);
holder.logoView.setImageDrawable(res);
//the news image
String newsImageURL = objects.get(position).getNewsImageURL();
if(newsImageURL!=null) {
// show The Image in a ImageView
//pre-execute
holder.progressBar.setVisibility(View.VISIBLE);
holder.newsImageView.setVisibility(View.VISIBLE);
RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) holder.bodyTextView.getLayoutParams();
params.addRule(RelativeLayout.BELOW, R.id.relative_container);
Picasso.with(context).load(newsImageURL).into(holder.newsImageView);//EXECUTE in background
holder.progressBar.setVisibility(View.INVISIBLE);//post-execute
}
else
{
System.out.println("NO IMAGE");
//adjusting the view
holder.progressBar.setVisibility(View.INVISIBLE);
holder.newsImageView.setVisibility(View.GONE);
RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) holder.bodyTextView.getLayoutParams();
params.addRule(RelativeLayout.BELOW, R.id.txtDate);
}
return convertView;
}
@Override
public Filter getFilter() {
Filter filter = new Filter() {
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,FilterResults results) {
filteredObjects = (ArrayList<CustomObject>) results.values; // has the filtered values
notifyDataSetChanged(); // notifies the data with new filtered values
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
System.out.println("FILTERING with the keyword:"+ constraint);
FilterResults results = new FilterResults(); // Holds the results of a filtering operation in values
ArrayList<Object> FilteredArrList = new ArrayList<Object>();
if (objects == null) {
objects = new ArrayList<CustomObject>(filteredObjects); // saves the original data in mOriginalValues
}
/********
*
* If constraint(CharSequence that is received) is null returns the mOriginalValues(Original) values
* else does the Filtering and returns FilteredArrList(Filtered)
*
********/
if (constraint == null || constraint.length() == 0) {
// set the Original result to return
results.count = objects.size();
results.values = objects;
} else {
constraint = constraint.toString().toLowerCase();
for (int i = 0; i < objects.size(); i++) {
System.out.println("loop "+i);
String title = objects.get(i).getTitle();
String date = objects.get(i).getDate();
String body = objects.get(i).getBody();
String source_logo = objects.get(i).getSource_logo();
String newsImageURL = objects.get(i).getNewsImageURL();
System.out.println("title of this item:"+title+", key word:"+constraint.toString());
if (title.contains(constraint.toString()) || date.contains(constraint.toString()) || body.contains(constraint.toString())) {
System.out.println("FOUND!");
FilteredArrList.add(new CustomObject(title,date, body, source_logo, newsImageURL));
}
}
// set the Filtered result to return
results.count = FilteredArrList.size();
results.values = FilteredArrList;
}
return results;
}
};
return filter;
}
}
class CustomObject {
private String title;
private String date;
private String body;
private String source_logo;
private String newsImageURL;
public CustomObject(String prop1, String prop2, String prop3, String prop4, String prop5) {
this.title = prop1;
this.date = prop2;
this.body=prop3;
this.source_logo=prop4;
this.newsImageURL=prop5;
}
public String getTitle() {
return title;
}
public String getDate() {
return date;
}
public String getBody(){
return body;
}
public String getSource_logo()
{
return source_logo;
}
public String getNewsImageURL(){ return newsImageURL; }
}
在我的活动：
我的动态XML文件：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<RelativeLayout
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
<EditText
android:id="@+id/news_search_editText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="البحث"
/>
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/activity_main_swipe_refresh_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/news_search_editText">
<ListView
android:id="@+id/activity_main_listview"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
</ListView>
</android.support.v4.widget.SwipeRefreshLayout>
</RelativeLayout>
<Button
android:text="تحديث ↑"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/refresh_button"
android:background="@drawable/button_refresh"
android:layout_alignParentTop="true"
android:layout_centerInParent="true"
android:layout_gravity="center"
android:layout_marginTop="50dp"
/>
</RelativeLayout>
不幸的是，过滤的行为是不正确的。虽然我可以在日志中看到关键字与每行内容之间的比较是否正确完成，并且只有匹配关键字被添加到已过滤列表中，但更新列表并不正确。当我输入列表中的关键字时，它会显示列表中的前几个项目（其中一些与关键字无关）并删除其余项目。当我输入不在列表中的关键字时，它将清除列表视图。因此，这种行为是奇怪的和意外的。有人可以提出解决方案吗？