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。我得到空指针错误。
MainActivity
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);
}
AdapterFilter.Class
这是我的适配器过滤器类，它由ArrayAdapter类扩展。
public class AdapterFilter extends ArrayAdapter<Personinfo> {
ArrayList<Personinfo> list = new ArrayList<Personinfo>();
Context context;
LayoutInflater inflater;
public AdapterFilter(Context context, int resource,
ArrayList<Personinfo> list) {
super(context, resource);
this.list = list;
this.context = context;
inflater = LayoutInflater.from(this.context);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
@Override
public Personinfo getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder viewHolder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.child_listview, parent,
false);
viewHolder = new ViewHolder(convertView);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
final Personinfo personinfo = (Personinfo) getItem(position);
viewHolder.txtName.setText(personinfo.getName());
viewHolder.txtPhone.setText(personinfo.getPhoneno());
viewHolder.imageButtonCalling.setOnClickListener(new OnClickListener() {
// Calling on selected number
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(context, "number button Clicked",
Toast.LENGTH_SHORT).show();
String selectedChildPhone = personinfo.getPhoneno();
String phoneNo = "tel:" + selectedChildPhone.trim();
Intent intent = new Intent(Intent.ACTION_CALL);
intent.setData(Uri.parse(phoneNo));
context.startActivity(intent);
}
});
viewHolder.imageButtonMessage.setOnClickListener(new OnClickListener() {
// Sending sms to whatsapp
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(context, "meesaage button Clicked",
Toast.LENGTH_SHORT).show();
String selectedChildPhone = personinfo.getPhoneno();
Uri mUri = Uri.parse("smsto:" + selectedChildPhone);
Intent mIntent = new Intent(Intent.ACTION_SENDTO, mUri);
mIntent.setPackage("com.whatsapp");
mIntent.putExtra("sms_body", "The text goes here");
mIntent.putExtra("chat", true);
context.startActivity(mIntent);
}
});
return convertView;
}
private class ViewHolder {
TextView txtName, txtPhone;
ImageButton imageButtonCalling, imageButtonMessage;
public ViewHolder(View item) {
txtName = (TextView) item.findViewById(R.id.person_name);
txtPhone = (TextView) item.findViewById(R.id.phoneno);
imageButtonCalling = (ImageButton) item
.findViewById(R.id.imageButtonCalling);
imageButtonMessage = (ImageButton) item
.findViewById(R.id.imageButtonMessage);
}
}
}
LogCat
08-03 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
答案 0 :(得分：0)
在您的“活动”中执行类似操作并在键入操作栏搜索时调用过滤器
@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);
}
在适配器中编写过滤器方法
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此代码，必须使用您的数据更改它。