Java 尝试调用虚拟方法';void android.widget.ListView.clearTextFilter()';关于空对象引用
现在我在我的listview中创建searchview 这是我的密码Java 尝试调用虚拟方法';void android.widget.ListView.clearTextFilter()';关于空对象引用,java,android,searchview,Java,Android,Searchview,现在我在我的listview中创建searchview 这是我的密码 package intikom.streammobile.Customer; import android.app.ProgressDialog; import android.app.SearchManager; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; i
package intikom.streammobile.Customer;
import android.app.ProgressDialog;
import android.app.SearchManager;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.SearchView;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
import java.util.ArrayList;
import java.util.List;
import intikom.streammobile.Index;
import intikom.streammobile.R;
import intikom.streammobile.Utility.BigProccess;
import intikom.streammobile.Utility.RESTClient;
import intikom.streammobile.Workflow.MyRequest.ListRequestItem;
import intikom.streammobile.Workflow.WorkflowActivity;
public class ListCustomer extends AppCompatActivity implements SearchView.OnQueryTextListener {
private static final String ARG_SECTION_NUMBER = "section_number";
private static String URLService;
private static String rowsPerPage;
private static ListView lv;
private static SharedPreferences pref;
private List<ListCustomerItem> mItems;
private List<ListCustomerItem> mItems2;
private ListCustomerItem item;
private static String customerID;
public ListCustomer() {
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_customer);
URLService = getString(R.string.URLService);
final ListView lv = (ListView)findViewById(R.id.lvCustomerList);
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
item = new ListCustomerItem();
item = mItems.get(position);
SharedPreferences pref = getApplicationContext().getSharedPreferences("MyPref", MODE_PRIVATE);
SharedPreferences.Editor editor = pref.edit();
editor.putString("CustomerID", item.CustID);
editor.putString("CustomerName", item.CustName);
editor.commit();
Intent i = new Intent(getApplicationContext(),WorkflowActivity.class);
i.putExtra("CustomerName", item.CustName);
setResult(1000, i);
finish();
}
});
getCustomer();
getLocal();
if (mItems==null)
{
if(mItems2==null) {
Toast.makeText(this, "Internet connection appears to be offline",
Toast.LENGTH_LONG).show();
}
else
{
lv.setAdapter(new ListCustomerAdapter(this, mItems2));
}
}
else
{
lv.setAdapter(new ListCustomerAdapter(this, mItems));
}
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.searchbox, menu);
SearchManager searchManager =
(SearchManager) getSystemService(Context.SEARCH_SERVICE);
SearchView searchView =
(SearchView) menu.findItem(R.id.action_search).getActionView();
searchView.setSearchableInfo(
searchManager.getSearchableInfo(getComponentName()));
searchView.setSubmitButtonEnabled(true);
searchView.setOnQueryTextListener(this);
return true;
}
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
if (TextUtils.isEmpty(newText))
{
lv.clearTextFilter();
}
else
{
lv.setFilterText(newText.toString());
}
return true;
}
}
包intikom.streammobile.Customer;
导入android.app.ProgressDialog;
导入android.app.SearchManager;
导入android.content.Context;
导入android.content.Intent;
导入android.content.SharedReferences;
导入android.os.Bundle;
导入android.support.v7.app.AppActivity;
导入android.support.v7.widget.SearchView;
导入android.text.TextUtils;
导入android.view.KeyEvent;
导入android.view.Menu;
导入android.view.MenuInflater;
导入android.view.MenuItem;
导入android.view.view;
导入android.widget.AdapterView;
导入android.widget.ListView;
导入android.widget.Toast;
导入org.json.simple.JSONArray;
导入org.json.simple.JSONObject;
导入org.json.simple.parser.JSONParser;
导入org.json.simple.parser.ParseException;
导入java.util.ArrayList;
导入java.util.List;
进口intikom.streammobile.Index;
进口intikom.streammobile.R;
导入intikom.streammobile.Utility.bigprocess;
导入intikom.streammobile.Utility.RESTClient;
导入intikom.streammobile.Workflow.MyRequest.ListRequestItem;
导入intikom.streammobile.Workflow.WorkflowActivity;
公共类ListCustomer扩展AppCompatActivity实现SearchView.OnQueryTextListener{
私有静态最终字符串ARG\u SECTION\u NUMBER=“SECTION\u NUMBER”;
私有静态字符串服务;
私有静态字符串行页面;
私有静态ListView lv;
私有静态SharedReferences优先;
私人名单;
私人名单2;
私有ListCustomerItem项目;
私有静态字符串customerID;
公共列表客户(){
}
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity\u list\u customer);
URLService=getString(R.string.URLService);
最终ListView lv=(ListView)findViewById(R.id.lvCustomerList);
lv.setTextFilterEnabled(真);
lv.setOnItemClickListener(新的AdapterView.OnItemClickListener(){
@凌驾
public void onItemClick(AdapterView父对象、视图、整型位置、长id){
item=新的ListCustomerItem();
item=mItems.get(位置);
SharedPreferences pref=getApplicationContext().getSharedPreferences(“MyPref”,MODE_PRIVATE);
SharedReferences.Editor=pref.edit();
editor.putString(“CustomerID”,item.CustID);
editor.putString(“CustomerName”,item.CustName);
commit();
Intent i=新的Intent(getApplicationContext(),WorkflowActivity.class);
i、 putExtra(“客户名称”,item.CustName);
setResult(1000,i);
完成();
}
});
getCustomer();
getLocal();
if(mItems==null)
{
if(mItems2==null){
Toast.makeText(此“Internet连接似乎处于脱机状态”,
Toast.LENGTH_LONG).show();
}
其他的
{
lv.setAdapter(新的ListCustomerAdapter(this,mItems2));
}
}
其他的
{
lv.setAdapter(新的ListCustomerAdapter(this,mItems));
}
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
getMenuInflater().充气(R.menu.searchbox,菜单);
搜索管理器搜索管理器=
(SearchManager)getSystemService(Context.SEARCH\u服务);
搜索视图搜索视图=
(SearchView)menu.findItem(R.id.action_search).getActionView();
searchView.setSearchableInfo(
getSearchableInfo(getComponentName());
searchView.setSubmitButtonEnabled(true);
setOnQueryTextListener(这个);
返回true;
}
@凌驾
公共布尔值onQueryTextSubmit(字符串查询){
返回false;
}
@凌驾
公共布尔onQueryTextChange(字符串newText){
if(TextUtils.isEmpty(newText))
{
lv.clearTextFilter();
}
其他的
{
lv.setFilterText(newText.toString());
}
返回true;
}
}
这是XMl布局菜单
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/action_search"
android:icon="@android:drawable/ic_menu_search"
app:showAsAction="collapseActionView|always"
android:title="Search"
app:actionViewClass="android.support.v7.widget.SearchView"/>
</menu>
在logcat中说:
尝试调用虚拟方法“void”
空对象引用上的android.widget.ListView.clearTextFilter()
你能告诉我哪里错了吗?换行:
为此:
您已经将listview
实例声明为global
,并且再次将其定义为local
变量,这就是为什么global
实例总是在null
中的原因
final ListView lv = (ListView)findViewById(R.id.lvCustomerList);
lv = (ListView)findViewById(R.id.lvCustomerList);