我想在我的应用中实现搜索功能。我正在为ArrayAdapter<String>使用自定义listview，因为我连续有两个textViews。我的应用程序不强制关闭，但搜索无法正常工作。它不会过滤listview，但是当我在listview中输入不存在的内容时，它会正确显示no item found页面。可能有什么不对？这是代码。请引导我走正确的道路！
MainActivity.java
public class MainActivity extends Activity {
final String[] elename ={"Hydrogen","Helium","Lithium","Beryllium","Boron","Carbon","Nitrogen","Oxygen","Fluorine","Neon","Sodium","Magnesium","Aluminium","Silicon","Phosphorous","Sulphur","Chlorine","Argon","Potassium","Calcium","Scandium","Titanium","Vanadium","Chromium","Manganese","Iron","Cobalt","Nickel","Copper","Zinc","Gallium","Germanium","Arsenic","Selenium","Bromine","Krypton","Rubidium","Strontium","Yttrium","Zirconium","Niobium","Molybdenum","Technetium","Ruthenium","Rhodium","Palladium","Silver","Cadmium","Indium","Tin","Antimony","Tellurium","Iodine","Xenon","Caesium","Barium","Lanthanum","Cerium","Praseodymium","Neodymium","Promethium","Samarium","Europium","Gadolinium","Terbium","Dysprosium","Holmium","Erbium","Thulium","Ytterbium","Lutetium","Hafnium","Tantalum","Tungsten","Rhenium","Osmium","Iridium","Platinum","Gold","Mercury","Thallium","Lead","Bismuth","Polonium","Astatine","Radon","Francium","Radium","Actinium","Thorium","Protactinium","Uranium","Neptunium","Plutonium","Americium","Curium","Berkelium","Californium","Einsteinium","Fermium","Mendelevium","Nobelium","Lawrencium","Rutherfordium","Dubnium","Seaborgium","Bohrium","Hassium","Meitnerium","Darmstadtium","Roentgenium","Copernicium","Ununtrium","Ununquadium","Ununpentium","Ununhexium","Ununseptium","Ununoctium"};
final String[] nos = {"1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28","29","30","31","32","33","34","35","36","37","38","39","40","41","42","43","44","45","46","47","48","49","50","51","52","53","54","55","56","57","58","59","60","61","62","63","64","65","66","67","68","69","70","71","72","73","74","75","76","77","78","79","80","81","82","83","84","85","86","87","88","89","90","91","92","93","94","95","96","97","98","99","100","101","102","103","104","105","106","107","108","109","110","111","112","113","114","115","116","117","118"};
CustomAdapter cus;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText searchBar = (EditText) findViewById(R.id.searchbar);
final DrawerLayout drawer = (DrawerLayout)findViewById(R.id.drawer_layout);
final ListView navList = (ListView) findViewById(R.id.left_drawer);
final LinearLayout linearLayout = (LinearLayout)findViewById(R.id.left_drawer_layout);
cus = new CustomAdapter(MainActivity.this,elename,nos);
navList.setAdapter(cus);
navList.setOnItemClickListener(new AdapterView.OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> parent, View view, final int pos,long id){
//Change view according to numbers
drawer.closeDrawer(linearLayout);
}
});
//filter list view after search instantly
searchBar.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// When user changed the Text
MainActivity.this.cus.getFilter().filter(cs);
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,int arg3) {
}
@Override
public void afterTextChanged(Editable s) {
}
});
//hide the keyboard after search on touch list view
navList.setOnScrollListener(new AbsListView.OnScrollListener() {
public void onScrollStateChanged(AbsListView view, int scrollState) {
//hide keyboard
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(navList.getWindowToken(), 0);
}
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
}
});
navList.setEmptyView(findViewById(R.id.empty));
}
}
CustomAdapter.java
class CustomAdapter extends ArrayAdapter<String>
{
String A[],B[];
LayoutInflater mInflater;
public CustomAdapter(Context context, String[] A,String B[])
{
super(context,R.layout.list_item,A);
this.A = A;
this.B = B;
mInflater = LayoutInflater.from(context);
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if(convertView==null)
{
convertView = mInflater.inflate(R.layout.list_item,parent,false);
holder = new ViewHolder();
holder.tv1 = (TextView)convertView.findViewById(R.id.element_name);
holder.tv2 = (TextView)convertView.findViewById(R.id.element_nos);
convertView.setTag(holder);
}else{
holder = (ViewHolder)convertView.getTag();
}
holder.tv1.setText(A[position]);
holder.tv2.setText(B[position]);
return convertView;
}
static class ViewHolder
{
TextView tv1,tv2;
}
}
编辑：应用程序在接口实现后关闭。
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.Chinmay.navigationdrawer/com.Chinmay.navigationdrawer.MainActivity}: java.lang.ClassCastException: com.Chinmay.navigationdrawer.MainActivity
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
at android.app.ActivityThread.access$1500(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3687)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassCastException: com.Chinmay.navigationdrawer.MainActivity
at com.Chinmay.navigationdrawer.MainActivity.onCreate(MainActivity.java:49)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
答案 0 :(得分：0)
在cus.setSearchFilterItemListener(this);
navList.setAdapter(cus);
<强>更新
第1步 创建一个界面
public interface SearchFilterItemListener {
public void setData(String[] myArray);
}
第2步 更新自定义适配器类
class CustomAdapter extends ArrayAdapter<String> {
String A[], B[], origA[], origB[];
LayoutInflater mInflater;
public CustomAdapter(Context context, String[] A,String B[]) {
super(context, R.layout.list_item, A);
this.A = A;
this.B = B;
this.origA = A;
this.origB = B;
mInflater = LayoutInflater.from(context);
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if(convertView == null) {
convertView = mInflater.inflate(R.layout.list_item, parent, false);
holder = new ViewHolder();
holder.tv1 = (TextView)convertView.findViewById(R.id.element_name);
holder.tv2 = (TextView)convertView.findViewById(R.id.element_nos);
convertView.setTag(holder);
} else {
holder = (ViewHolder)convertView.getTag();
}
holder.tv1.setText(A[position]);
holder.tv2.setText(B[position]);
return convertView;
}
static class ViewHolder {
TextView tv1,tv2;
}
@Override
public Filter getFilter() {
if (listFilter == null)
listFilter = new TabFilter();
return listFilter;
}
private class TabFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
// TODO Auto-generated method stub
FilterResults results = new FilterResults();
// Filter Logic
if (constraint == null || constraint.length() == 0) {
// No filter, return all the list
results.values = origA; //considering that you want to filter on the String[] A
results.count = origA.size();
} else {
// We perform filtering operation
String[] nList = new String[A.length];
for (int counter = 0; counter < A.length; counter++) {
if (A[counter].toUpperCase(Locale.US).startsWith(constraint.toString().toUpperCase(Locale.US)))
nList[counter] = A[counter];
}
results.values = nList;
results.count = nList.length;
}
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
// TODO Auto-generated method stub
// Now we have to inform the adapter about the new filtered list
if (results.count == 0)
notifyDataSetInvalidated();
else {
A = (String[]) results.values;
String[] newList = new String[A.length];
newList = A.clone();
notifyDataSetChanged();
mSearchListener.setData(newList);
}
}
}
public String[] getSearchList() {
return A;
}
public void setSearchFilterItemListener(SearchFilterItemListener mSearchFilterListener) {
mSearchListener = mSearchFilterListener;
}
}
答案 1 :(得分：0)
好的，这是你的适配器：
class CustomAdapter extends ArrayAdapter<Item> {
LayoutInflater mInflater;
public CustomAdapter(Context context) {
super(context, 0);
mInflater = LayoutInflater.from(context);
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if(convertView == null) {
convertView = mInflater.inflate(android.R.layout.simple_expandable_list_item_2, parent, false);
holder = new ViewHolder();
holder.tv1 = (TextView)convertView.findViewById(android.R.id.text1);
holder.tv2 = (TextView)convertView.findViewById(android.R.id.text2);
convertView.setTag(holder);
} else {
holder = (ViewHolder)convertView.getTag();
}
Item item = getItem(position);
holder.tv1.setText(item.text1);
holder.tv2.setText(item.text2);
return convertView;
}
}
现在你有一个包含两个字符串的Item类：
class Item {
String text1;
String text2;
Item(String t1, String t2) {
text1 = t1;
text2 = t2;
}
@Override
public String toString() {
return text1;
}
}
和ViewHolder：
class ViewHolder {
TextView tv1, tv2;
}
现在在onCreate中测试它（尝试按任意字母，“p”例如过滤掉以“p”开头的项目：
CustomAdapter adapter = new CustomAdapter(this);
for (int i = 0; i < elename.length; i++) {
adapter.add(new Item(elename[i], nos[i]));
}
lv = new ListView(this);
lv.setTextFilterEnabled(true);
lv.setAdapter(adapter);
setContentView(lv);