如何在android中使用listview使用搜索视图
我想使用listview在操作栏上添加搜索视图。我在操作栏上添加了搜索视图，但它不是搜索列表视图。我得到了空指针错误如何在android中使用listview使用搜索视图,android,listview,android-actionbar,android-arrayadapter,searchview,Android,Listview,Android Actionbar,Android Arrayadapter,Searchview,我想使用listview在操作栏上添加搜索视图。我在操作栏上添加了搜索视图，但它不是搜索列表视图。我得到了空指针错误 main活动 protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); actionBar = getActi
main活动protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
actionBar = getActionBar();
list = new ArrayList<Personinfo>();
databaseHelper = new DatabaseHelper(this);
csvToSqlite();
listView = (ListView) findViewById(R.id.listview);
getlistData();
adapterfilter = new AdapterFilter(this, R.layout.child_listview, list);
listView.setAdapter(adapterfilter);
listView.setTextFilterEnabled(true);
synchronized (listView) {
listView.notify();
// }
}
}
public void getlistData() {
// TODO Auto-generated method stub
Cursor cursor = databaseHelper.getData();
cursor.moveToFirst();
do {
String name = cursor.getString(cursor.getColumnIndex("Name"));
String phoneNo = cursor.getString(cursor.getColumnIndex("PhoneNo"));
Personinfo personinfo = new Personinfo(name, phoneNo);
list.add(personinfo);
} while (cursor.moveToNext());
cursor.close();
}
public void csvToSqlite() {
try {
String reader = "";
boolean skipheader = true;
InputStream inputStream = getResources().openRawResource(
R.raw.agrawalsurnamedata);
BufferedReader in = new BufferedReader(new InputStreamReader(
inputStream));
while ((reader = in.readLine()) != null) {
// skip header column name from csv
if (skipheader) {
skipheader = false;
continue;
}
String[] RowData = reader.split(",");
if (databaseHelper.insertContact(RowData) == true) {
Log.i("inside csvToSqlite()", " data inserted successfully");
} else {
Log.i("inside csvToSqlite()",
" data is not inserted into db");
}
}
in.close();
} catch (Exception e) {
e.getMessage();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
SearchView searchView = (SearchView) menu.findItem(R.id.action_search)
.getActionView();
searchView.setSearchableInfo(searchManager
.getSearchableInfo(getComponentName()));
SearchView.OnQueryTextListener textChangeListener = new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextChange(String newText) {
// this is your adapter that will be filtered
adapterfilter.getFilter().filter(newText);
System.out.println("on text chnge text: " + newText);
return true;
}
@Override
public boolean onQueryTextSubmit(String query) {
// this is your adapter that will be filtered
adapterfilter.getFilter().filter(query);
System.out.println("on query submit: " + query);
return true;
}
};
searchView.setOnQueryTextListener(textChangeListener);
return super.onCreateOptionsMenu(menu);
}
LogCat08-03 16:32:49.993: E/AndroidRuntime(12722): FATAL EXCEPTION: main
08-03 16:32:49.993: E/AndroidRuntime(12722): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.androidhub4you.searchactionbardemo/com.androidhub4you.searchactionbardemo.SearchActivity}: java.lang.NullPointerException
08-03 16:32:49.993: E/AndroidRuntime(12722): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2121)
08-03 16:32:49.993: E/AndroidRuntime(12722): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2146)
08-03 16:32:49.993: E/AndroidRuntime(12722): at android.app.ActivityThread.access$700(ActivityThread.java:140)
08-03 16:32:49.993: E/AndroidRuntime(12722): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1238)
08-03 16:32:49.993: E/AndroidRuntime(12722): at android.os.Handler.dispatchMessage(Handler.java:99)
08-03 16:32:49.993: E/AndroidRuntime(12722): at android.os.Looper.loop(Looper.java:177)
08-03 16:32:49.993: E/AndroidRuntime(12722): at android.app.ActivityThread.main(ActivityThread.java:4947)
08-03 16:32:49.993: E/AndroidRuntime(12722): at java.lang.reflect.Method.invokeNative(Native Method)
08-03 16:32:49.993: E/AndroidRuntime(12722): at java.lang.reflect.Method.invoke(Method.java:511)
08-03 16:32:49.993: E/AndroidRuntime(12722): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
08-03 16:32:49.993: E/AndroidRuntime(12722): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
08-03 16:32:49.993: E/AndroidRuntime(12722): at dalvik.system.NativeStart.main(Native Method)
08-03 16:32:49.993: E/AndroidRuntime(12722): Caused by: java.lang.NullPointerException
08-03 16:32:49.993: E/AndroidRuntime(12722): at com.androidhub4you.searchactionbardemo.SearchActivity.onCreate(SearchActivity.java:86)
08-03 16:32:49.993: E/AndroidRuntime(12722): at android.app.Activity.performCreate(Activity.java:5207)
08-03 16:32:49.993: E/AndroidRuntime(12722): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
08-03 16:32:49.993: E/AndroidRuntime(12722): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2085)
08-03 16:32:49.993: E/AndroidRuntime(12722): ... 11 more
在“活动”中，执行类似操作，并在键入“操作栏搜索”时调用筛选器
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_contacts, menu);
invalidateOptionsMenu();
// Associate searchable configuration with the SearchView
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
SearchView searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
SearchView.OnQueryTextListener queryTextWatcher = new SearchView.OnQueryTextListener(){
@Override
public boolean onQueryTextSubmit(String query) {
// TODO Auto-generated method stub
return true;
}
@Override
public boolean onQueryTextChange(String newText) {
// TODO Auto-generated method stub
objAdapter.filter(newText);
return true;
}
};
searchView.setOnQueryTextListener(queryTextWatcher);
return super.onCreateOptionsMenu(menu);
}
public void filter(String charText ) {
// TODO Auto-generated method stub
charText = charText.toLowerCase(Locale.getDefault());
//charText = charText.replace(" ", "");
items.clear();
if (charText.length() == 0) {
items.addAll(arraylist);
}
else {
for (ContactBean ob : arraylist){
if (ob.getName().toLowerCase(Locale.getDefault()).contains(charText)
|| ob.getPhoneNo().toLowerCase(Locale.getDefault()).contains(charText)){
items.add(ob);
}
}
}
notifyDataSetChanged();
我在我的应用程序中使用了此代码，但必须使用您的数据对其进行更改。可能重复的代码不是此链接的重复。它只解释NPE，但我的问题不同@SelvinIt在你的代码中是NPE+你甚至没有尝试去理解什么东西是空的，为什么是空的。。。所以是的，这是一个重复，你能解释一下我在实现中的错误吗@塞尔文：只需跟随链接。。。
public void filter(String charText ) {
// TODO Auto-generated method stub
charText = charText.toLowerCase(Locale.getDefault());
//charText = charText.replace(" ", "");
items.clear();
if (charText.length() == 0) {
items.addAll(arraylist);
}
else {
for (ContactBean ob : arraylist){
if (ob.getName().toLowerCase(Locale.getDefault()).contains(charText)
|| ob.getPhoneNo().toLowerCase(Locale.getDefault()).contains(charText)){
items.add(ob);
}
}
}
notifyDataSetChanged();