在android中如何在listview中使用searchview？
Listview 包含 imageview 和多个 textviews
当我过去在搜索中键入一些文本时，列表视图要根据我的搜索显示
如何执行此操作
在此先感谢
【问题讨论】：
像这样创建一个自定义适配器
public class PlanetAdapter extends ArrayAdapter<Planet> implements Filterable {
private List<Planet> planetList;
private Context context;
private Filter planetFilter;
private List<Planet> origPlanetList;
public PlanetAdapter(List<Planet> planetList, Context ctx) {
super(ctx, R.layout.img_row_layout, planetList);
this.planetList = planetList;
this.context = ctx;
this.origPlanetList = planetList;
}
public int getCount() {
return planetList.size();
}
public Planet getItem(int position) {
return planetList.get(position);
}
public long getItemId(int position) {
return planetList.get(position).hashCode();
}
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
PlanetHolder holder = new PlanetHolder();
// First let's verify the convertView is not null
if (convertView == null) {
// This a new view we inflate the new layout
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = inflater.inflate(R.layout.img_row_layout, null);
// Now we can fill the layout with the right values
TextView tv = (TextView) v.findViewById(R.id.name);
TextView distView = (TextView) v.findViewById(R.id.dist);
holder.planetNameView = tv;
holder.distView = distView;
v.setTag(holder);
}
else
holder = (PlanetHolder) v.getTag();
Planet p = planetList.get(position);
holder.planetNameView.setText(p.getName());
holder.distView.setText("" + p.getDistance());
return v;
}
public void resetData() {
planetList = origPlanetList;
}
/* *********************************
* We use the holder pattern
* It makes the view faster and avoid finding the component
* **********************************/
private static class PlanetHolder {
public TextView planetNameView;
public TextView distView;
}
/*
* We create our filter
*/
@Override
public Filter getFilter() {
if (planetFilter == null)
planetFilter = new PlanetFilter();
return planetFilter;
}
private class PlanetFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
// We implement here the filter logic
if (constraint == null || constraint.length() == 0) {
// No filter implemented we return all the list
results.values = origPlanetList;
results.count = origPlanetList.size();
}
else {
// We perform filtering operation
List<Planet> nPlanetList = new ArrayList<Planet>();
for (Planet p : planetList) {
if (p.getName().toUpperCase().startsWith(constraint.toString().toUpperCase()))
nPlanetList.add(p);
}
results.values = nPlanetList;
results.count = nPlanetList.size();
}
return results;
}
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
// Now we have to inform the adapter about the new list filtered
if (results.count == 0)
notifyDataSetInvalidated();
else {
planetList = (List<Planet>) results.values;
notifyDataSetChanged();
}
}
}
}
为行星创建 POJO（getter setter 类） 然后在你的活动中
//要显示的数据
List<Planet> planetsList = new ArrayList<Planet>();
PlanetAdapter aAdpt;
ListView lv = (ListView) findViewById(R.id.listView);
aAdpt = new PlanetAdapter(planetsList, this);
lv.setAdapter(aAdpt);
你可以像这样使用过滤
// TextFilter
lv.setTextFilterEnabled(true);
EditText editTxt = (EditText) findViewById(R.id.editTxt);
editTxt.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
System.out.println("Text ["+s+"] - Start ["+start+"] - Before ["+before+"] - Count ["+count+"]");
if (count < before) {
// We're deleting char so we need to reset the adapter data
aAdpt.resetData();
}
aAdpt.getFilter().filter(s.toString());
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
【讨论】：
iam 解决了这个问题，也使用 base adapter 你可以试试这个
公共类 SubjectsActivity 扩展 Activity {
private ImageView imgNavBarSubjectBook;
private ArrayList<String> arrSubjectResponse;
private ArrayList<String> arrChapterName;
private ArrayList<String> arrFileUrl;
private ArrayList<String> arrFileSize;
private ListView listChapter;
private TextView subjectName;
private EditText edtSearch;
private int textlength = 0;
// Google Analytics starts from here
private EasyTracker easyTracker = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_subjects);
easyTracker = EasyTracker.getInstance(SubjectsActivity.this);
subjectName = (TextView) findViewById(R.id.txtSubjectName);
imgNavBarSubjectBook = (ImageView) findViewById(R.id.img_nav_bar_Subject_book);
arrSubjectResponse = new ArrayList<String>();
arrChapterName = new ArrayList<String>();
arrFileUrl = new ArrayList<String>();
arrFileSize = new ArrayList<String>();
imgNavBarSubjectBook.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
}
});
Typeface tf = Typeface.createFromAsset(getAssets(), "Georgia.ttf");
subjectName.setTypeface(tf, Typeface.BOLD);
Bundle bundle = getIntent().getExtras();
if (bundle != null) {
arrSubjectResponse = bundle
.getStringArrayList("arr_subject_response");
for (int i = 1; i < arrSubjectResponse.size(); i = i + 8) {
arrChapterName.add(arrSubjectResponse.get(i + 2));
arrFileUrl.add(arrSubjectResponse.get(i + 6));
arrFileSize.add(arrSubjectResponse.get(i + 5));
}
}
listChapter = (ListView) findViewById(R.id.listChapter);
subjectName.setText(CoursesAdapter.Subject_Name);
listChapter.setAdapter(new SubjectAdapter(SubjectsActivity.this,
arrChapterName, arrFileUrl, arrFileSize));
edtSearch = (EditText) findViewById(R.id.edtSearchSubjects);
edtSearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
// TODO Auto-generated method stub
textlength = edtSearch.getText().length();
arrChapterName.clear();
arrFileUrl.clear();
for (int i = 1; i < arrSubjectResponse.size(); i = i + 8) {
String name = arrSubjectResponse.get(i + 2);
String searchtext = String.valueOf(s);// edtSearch.getText().toString();
if (textlength <= arrSubjectResponse.get(i + 2).length()) {
if (name.toLowerCase().indexOf
(searchtext.toLowerCase()) != -1) {
Log.d("",
"------------Entered add value to list-----");
arrChapterName.add(arrSubjectResponse.get(i + 2));
arrFileUrl.add(arrSubjectResponse.get(i + 6));
arrFileSize.add(arrSubjectResponse.get(i + 5));
}
}
}
listChapter.setAdapter(new SubjectAdapter(
SubjectsActivity.this, arrChapterName, arrFileUrl,
arrFileSize));
Log.d("", "Chapter------->" + arrChapterName);
Log.d("", "Fileurl---------->" + arrFileUrl);
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1,
int arg2, int arg3) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
}
});
}
@Override
public void onStart() {
super.onStart();
EasyTracker.getInstance(this).activityStart(this);
}
@Override
public void onStop() {
super.onStop();
EasyTracker.getInstance(this).activityStop(this);
}
}
【讨论】：