我正在开发一个应用程序。其中显示列表视图，其中数据来自SQLite数据库。我在String []中获取数据。
现在需要申请的是：我想在活动的顶部添加一个搜索栏。此搜索栏应仅在活动上显示的列表中执行搜索。
当用户在搜索栏中输入一个字母时，所有数据都应显示在列表视图中，其中包含该字母。
我尝试了以下代码。
在main.java中
EditText search= (EditText) findViewById(R.id.edittext_searchbar);
search.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence s, int start, int before, int count) {
adapter.getFilter().filter(s);
adapter.notifyDataSetChanged();
}
public void beforeTextChanged(CharSequence s, int start, int count,int after) {
}
@Override
public void afterTextChanged(Editable s) {
}
});
listView.setAdapter(adapter);
在Adapter类中：
public void setData(String[] menuList) {
menuListofAdapter = menuList;//contains class items data.
}
@Override
public Filter getFilter() {
return new Filter() {
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
if (results != null && results.count >= 0) {
setData((String[]) results.values);//if results of search is null set the searched results data
} else {
setData(menuListofAdapter);// set original values
}
notifyDataSetInvalidated();
}
@SuppressWarnings("null")
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults result = new FilterResults();
if (!TextUtils.isEmpty(constraint)) {
constraint = constraint.toString();
String[] fItem = null;
if(Utility.mainMenuList!=null){
for(int i=0,j=0;i<Utility.mainMenuList.length;i++){
if (Utility.mainMenuList[i].equalsIgnoreCase(constraint.toString())) {
fItem[j] = Utility.mainMenuList[i];
j=j+1;
}else{
}
}
}
result.count = fItem.length;
result.values = fItem;
} else{
result.count=-1;// no search results found
}
return result;
}
};
}
我应该为此做些什么。数据在String []中。在列表视图中显示。
请建议我需要进行哪些更改。
当我应用上面的代码并运行我的应用程序并尝试搜索时，我得到错误：
03-12 18:16:19.215: D/AndroidRuntime(836): Shutting down VM
03-12 18:16:19.215: W/dalvikvm(836): threadid=1: thread exiting with uncaught exception (group=0x40015560)
03-12 18:16:19.215: E/AndroidRuntime(836): FATAL EXCEPTION: main
03-12 18:16:19.215: E/AndroidRuntime(836): java.lang.ClassCastException: java.util.ArrayList
03-12 18:16:19.215: E/AndroidRuntime(836): at com.abc.example.adapters.MyListAdapter$1.publishResults(MainMenuListAdapter.java:41)
03-12 18:16:19.215: E/AndroidRuntime(836): at android.widget.Filter$ResultsHandler.handleMessage(Filter.java:282)
03-12 18:16:19.215: E/AndroidRuntime(836): at android.os.Handler.dispatchMessage(Handler.java:99)
03-12 18:16:19.215: E/AndroidRuntime(836): at android.os.Looper.loop(Looper.java:123)
03-12 18:16:19.215: E/AndroidRuntime(836): at android.app.ActivityThread.main(ActivityThread.java:3683)
03-12 18:16:19.215: E/AndroidRuntime(836): at java.lang.reflect.Method.invokeNative(Native Method)
03-12 18:16:19.215: E/AndroidRuntime(836): at java.lang.reflect.Method.invoke(Method.java:507)
03-12 18:16:19.215: E/AndroidRuntime(836): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
03-12 18:16:19.215: E/AndroidRuntime(836): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
03-12 18:16:19.215: E/AndroidRuntime(836): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)
根据您的要求，您必须在android中使用Sectioned List视图。请看这个链接。 http://samir-mangroliya.blogspot.in/2012/05/android-sectioned-listview-with-search_6865.html。 它会帮助你。让我知道你有任何疑问。
答案 1 :(得分：0)
在列表视图的顶部有一个editext。我建议你有一个自定义列表适配器。
列出数据库的原始值。
有另一个列表来设置临时数据以匹配搜索条件。
如果您的搜索条件与列表中的匹配，请将这些条件添加到founditmes并在列表中显示数据。如果它与列表中的显示原始数据不匹配。
我已经提出了一个大致的想法。以下代码可以根据您的需要进行修改。我自己实现了搜索，但它确实有效。
我在SO中问了一个问题，我从How to implement search in CustomListView based on class item of POJO class in Android?得到了答案。
尝试以下操作，如果您无法使其正常工作，您可以随时在SO中发布问题。
search= (EditText) findViewById(R.id.search);
//look for text changing in edittext.
search.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence s, int start, int before, int count) {
youradapter.getFilter().filter(s);
youradapter.notifyDataSetChanged();
}
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
public void afterTextChanged(Editable s) {
}
});
在列表中实施过滤器
public void setData(ArrayList mPpst) {
set data either searched data or original values from database
mPostingData = mPpst;//contains class items data.
}
@Override
public Filter getFilter() {
return new Filter() {
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
if (results != null && results.count >= 0) {
setData( results.values);//if results match set data
} else {
setData(mOri);// set data for listview original values.
}
notifyDataSetInvalidated();
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults result = new FilterResults();
if (!TextUtils.isEmpty(constraint)) {
ArrayList foundItems = new ArrayList();
constraint = constraint.toString().toLowerCase();
if(listitems!=null)
{
if(listitems.equals(constarint))//matching
foundItems.add(listitems);
}
else
{
}
}
}
result.count = foundItems.size();//search results found return count
result.values = foundItems;// return values
}
else
{
result.count=-1;// no search results found
}
return result;
}
};
}
编辑1
how to set json parsed data in a listview and then adding search functionality in it。链接中的答案有效。我使用了临时数据并对其进行了搜索功能。您可以显示数据表单数据库并进行修改。
编辑2：
public class MainActivity extends Activity {
// List view
private ListView lv;
// Listview Adapter
ArrayAdapter<String> adapter;
// Search EditText
EditText inputSearch;
// ArrayList for Listview
ArrayList<HashMap<String, String>> productList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Listview Data
String products[] = {"aaa","bbbb","cccc","dddd"};
lv = (ListView) findViewById(R.id.list_view);
inputSearch = (EditText) findViewById(R.id.inputSearch);
// Adding items to listview
adapter = new ArrayAdapter<String>(this, R.layout.list_item, R.id.product_name, products);
lv.setAdapter(adapter);
/**
* Enabling Search Filter
* */
inputSearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// When user changed the Text
MainActivity.this.adapter.getFilter().filter(cs);
}
@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
}
});
}
}
使用数据库中的数据编辑3搜索
public class SearchActivity extends ListActivity {
ArrayAdapter<String> dataAdapter = null;
private ArrayList<String> results = new ArrayList<String>();
private String tableName = DatabaseHandler.TABLE_SEARCH;
private SQLiteDatabase newDB;
ArrayAdapter<String> adapter = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.page_search);
DatabaseHandler dbHelper = new DatabaseHandler(this.getApplicationContext());
newDB = dbHelper.getWritableDatabase();
Cursor c = newDB.rawQuery("SELECT skeys FROM " +
tableName, null);
if (c != null ) {
if (c.moveToFirst()) {
do {
String skeys = c.getString(c.getColumnIndex("skeys"));
results.add(skeys);
}while (c.moveToNext());
}
}
dataAdapter = new ArrayAdapter<String>(this,
R.layout.listviews_search, results);
setListAdapter(new ArrayAdapter<String>(this,
R.layout.listviews_search, results));
ListView listView = (ListView) findViewById(android.R.id.list);
listView.setAdapter(dataAdapter);
listView.setTextFilterEnabled(true);
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(getApplicationContext(),
((TextView) view).getText(), Toast.LENGTH_SHORT).show();
}
});
EditText myFilter = (EditText) findViewById(R.id.search);
myFilter.addTextChangedListener(new TextWatcher(){
public void afterTextChanged(Editable s) {
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
public void onTextChanged(CharSequence s, int start, int before, int count) {
dataAdapter.getFilter().filter(s.toString());
}
});
}
}