Java 如何在搜索期间更新listview
这是我启动时的应用程序: 当我在列表视图中单击某个项目时,它将打开一个新活动并显示一些数据 当我搜索某物时,它看起来如下: 当我点击列表中的一个项目时,它会启动一个新的活动。但它开始的活动并不准确 这是我的密码: 家庭活动。课堂Java 如何在搜索期间更新listview,java,android,listview,Java,Android,Listview,这是我启动时的应用程序: 当我在列表视图中单击某个项目时,它将打开一个新活动并显示一些数据 当我搜索某物时,它看起来如下: 当我点击列表中的一个项目时,它会启动一个新的活动。但它开始的活动并不准确 这是我的密码: 家庭活动。课堂 package com.thesis.herbalmedicines.activity; import java.util.ArrayList; import java.util.Arrays; import android.app.Activity; import
package com.thesis.herbalmedicines.activity;
import java.util.ArrayList;
import java.util.Arrays;
import android.app.Activity;
import android.content.Intent;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SearchView;
import android.widget.TextView;
import android.widget.Toast;
public class HomeActivity extends BaseActivity implements
SearchView.OnQueryTextListener {
ListView lv;
SearchView search;
String[] herb_names, sample_arr; //= ["Boils","",""];//, iso_codes;
TypedArray herb_pics;
ArrayList<Home> homelist;
HomeAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getLayoutInflater().inflate(R.layout.home_layout, frameLayout);
mDrawerList.setItemChecked(position, true);
setTitle(listArray[position]);
android.app.ActionBar ab = getActionBar();
ColorDrawable colorDrawable = new ColorDrawable(Color.parseColor("#50B222"));
ab.setBackgroundDrawable(colorDrawable);
lv = (ListView) findViewById(R.id.list_view);
search = (SearchView) findViewById(R.id.search_view);
herb_names = getResources().getStringArray(R.array.herb_names);
//iso_codes = getResources().getStringArray(R.array.iso_Code);
herb_pics = getResources().obtainTypedArray(R.array.herb_pics);
homelist = new ArrayList<Home>();
for (int i = 0; i < herb_names.length; i++) {
Home home = new Home(herb_names[i], //iso_codes[i],
herb_pics.getResourceId(i, -1));
homelist.add(home);
}
adapter = new HomeAdapter(getApplicationContext(), homelist);
lv.setAdapter(adapter);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
if (position == 0) {
Intent a = new Intent(HomeActivity.this, Boils.class);
startActivity(a);
/** Fading Transition Effect */
HomeActivity.this.overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
}
else if (position == 1) {
Intent b = new Intent(HomeActivity.this, Cystitis.class);
startActivity(b);
/** Fading Transition Effect */
HomeActivity.this.overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
}
else if (position == 2) {
Intent c = new Intent(HomeActivity.this, Asthma.class);
startActivity(c);
/** Fading Transition Effect */
HomeActivity.this.overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
}
else if (position == 3) {
Intent d = new Intent(HomeActivity.this, Feet.class);
startActivity(d);
/** Fading Transition Effect */
HomeActivity.this.overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
}
}
});
search.setOnQueryTextListener(this);
}
@Override
public boolean onQueryTextChange(String newText) {
adapter.getFilter().filter(newText);
return false;
}
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
}
HomeAdapter.java
package com.thesis.herbalmedicines.activity;
public class Home {
String name;
int pics;
Home(String name, int pics) {
this.name = name;
this.pics = pics;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getPics() {
return pics;
}
public void setPics(int pics) {
this.pics = pics;
}
}
package com.thesis.herbalmedicines.activity;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.ImageView;
import android.widget.TextView;
public class HomeAdapter extends BaseAdapter implements Filterable {
Context context;
ArrayList<Home> homelist;
ArrayList<Home> mStringFilterList;
ValueFilter valueFilter;
HomeAdapter(Context context, ArrayList<Home> homelist) {
this.context = context;
this.homelist = homelist;
mStringFilterList = homelist;
}
@Override
public int getCount() {
return homelist.size();
}
@Override
public Object getItem(int position) {
return homelist.get(position);
}
@Override
public long getItemId(int position) {
return homelist.indexOf(getItem(position));
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater mInflater = (LayoutInflater) context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = null;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.list_item, null);
TextView name_tv = (TextView) convertView.findViewById(R.id.name);
ImageView iv = (ImageView) convertView.findViewById(R.id.pic);
Home home = homelist.get(position);
name_tv.setText(home.getName());
iv.setImageResource(home.getPics());
}
return convertView;
}
@Override
public Filter getFilter() {
if (valueFilter == null) {
valueFilter = new ValueFilter();
}
return valueFilter;
}
private class ValueFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
if (constraint != null && constraint.length() > 0) {
ArrayList<Home> filterList = new ArrayList<Home>();
for (int i = 0; i < mStringFilterList.size(); i++) {
if ((mStringFilterList.get(i).getName().toUpperCase())
.contains(constraint.toString().toUpperCase())) {
Home home = new Home(mStringFilterList.get(i)
.getName(), mStringFilterList.get(i)
.getPics());
filterList.add(home);
}
}
results.count = filterList.size();
results.values = filterList;
} else {
results.count = mStringFilterList.size();
results.values = mStringFilterList;
}
return results;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
homelist = (ArrayList<Home>) results.values;
notifyDataSetChanged();
}
}
}
package com.thesis.herbalmedicines.activity;
导入java.util.ArrayList;
导入android.app.Activity;
导入android.content.Context;
导入android.view.LayoutInflater;
导入android.view.view;
导入android.view.ViewGroup;
导入android.widget.BaseAdapter;
导入android.widget.Filter;
导入android.widget.Filterable;
导入android.widget.ImageView;
导入android.widget.TextView;
公共类HomeAdapter扩展BaseAdapter实现可筛选{
语境;
ArrayList homelist;
ArrayList mStringFilterList;
ValueFilter-ValueFilter;
HomeAdapter(上下文,ArrayList homelist){
this.context=上下文;
this.homelist=homelist;
mStringFilterList=家庭列表;
}
@凌驾
public int getCount(){
返回homelist.size();
}
@凌驾
公共对象getItem(int位置){
返回homelist.get(位置);
}
@凌驾
公共长getItemId(int位置){
返回homelist.indexOf(getItem(position));
}
@凌驾
公共视图getView(int位置、视图转换视图、视图组父视图){
LayoutInflater mInflater=(LayoutInflater)上下文
.getSystemService(活动.布局\充气机\服务);
convertView=null;
if(convertView==null){
convertView=mInflater.充气(R.layout.list_项,空);
TextView name_tv=(TextView)convertView.findViewById(R.id.name);
ImageView iv=(ImageView)convertView.findViewById(R.id.pic);
主页=主页列表。获取(位置);
name_tv.setText(home.getName());
iv.setImageResource(home.getPics());
}
返回视图;
}
@凌驾
公共过滤器getFilter(){
if(valueFilter==null){
valueFilter=新的valueFilter();
}
返回值过滤器;
}
私有类ValueFilter扩展了筛选器{
@凌驾
受保护的筛选器结果性能筛选(CharSequence约束){
FilterResults results=新的FilterResults();
if(constraint!=null&&constraint.length()>0){
ArrayList filterList=新建ArrayList();
对于(int i=0;i
在每个onSerch上将adpter设置为listview为什么要使用position导航到不同的活动
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
if (position == 0) {
Intent a = new Intent(HomeActivity.this, Boils.class);
startActivity(a);
/** Fading Transition Effect */
HomeActivity.this.overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
}
else if (position == 1) {
Intent b = new Intent(HomeActivity.this, Cystitis.class);
startActivity(b);
/** Fading Transition Effect */
HomeActivity.this.overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
}
else if (position == 2) {
Intent c = new Intent(HomeActivity.this, Asthma.class);
startActivity(c);
/** Fading Transition Effect */
HomeActivity.this.overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
}
else if (position == 3) {
Intent d = new Intent(HomeActivity.this, Feet.class);
startActivity(d);
/** Fading Transition Effect */
HomeActivity.this.overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
}
}
});
search.setOnQueryTextListener(this);
}
在活动中注册接收器,并传递要从适配器启动的活动类型
private ListViewClick callback;
HomeAdapter(Context context, ArrayList<Home> homelist,ListViewClick callback) {
this.context = context;
this.homelist = homelist;
mStringFilterList = homelist;
this.callback = callback;
}
private listview点击回调;
HomeAdapter(上下文上下文、ArrayList homelist、ListViewClick回调){
this.context=上下文;
this.homelist=homelist;
mStringFilterList=家庭列表;
this.callback=回调;
}
然后单击convertView的侦听器传递回调。onListClick(//要启动的活动类型)
只需保留“在家开展的活动类型”的参考。因此,您可以在单击列表视图的特定行时识别要启动的活动。添加一个字段,该字段保存要在
主类中加载的类。(id
字段是可选的)
在初始化主列表期间
添加id
// the classed to load
Class[] classes = {
Boils.class,
Cystitis.class,
Asthma.class,
Feet.class
};
for (int i = 0; i < herb_names.length; i++) {
Home home = new Home(i, herb_names[i], herb_pics.getResourceId(i, -1), classes[i]);
homelist.add(home);
}
您的适配器也应该做一些更改
在getView
中,您正在强制convertView
为空。这对性能不利。(也可以考虑使用ViewHolder
)
在publishResults
中,您正在为数据集创建一个新的引用。您应该更新现有的数据集
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
homelist.clear();
homelist.addAll((ArrayList<Home>) results.values);
notifyDataSetChanged();
}
@覆盖
受保护的void publishResults(CharSequence约束、FilterResults结果){
homelist.clear();
homelist.addAll((ArrayList)results.values);
notifyDataSetChanged();
}
你用过notifyDataSetChanged()吗?是的,我用过。我更新我的代码。请检查..你的结果是什么?打开了哪个活动?你能解释一下吗?但是它开始的活动不准确。有点?你能预测哪项活动将开始吗?很抱歉我没有很好地表达自己。看这段视频,这很清楚我的应用程序的问题。请尝试不将您的类实现为SearchView.OnQueryTextListenerint您的onQueryTextChange方法将返回false变为true。相同的结果将返回false变为true我认为您的方法存在问题。只需添加简单的textview并设置textChangeListner write yourAdapter.getFilters().filter(字符串);我已经照你说的做了,没有错
// the classed to load
Class[] classes = {
Boils.class,
Cystitis.class,
Asthma.class,
Feet.class
};
for (int i = 0; i < herb_names.length; i++) {
Home home = new Home(i, herb_names[i], herb_pics.getResourceId(i, -1), classes[i]);
homelist.add(home);
}
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Home item = (Home) adapter.getItem(position);
Intent d = new Intent(HomeActivity.this, item.getClazz());
startActivity(d);
/** Fading Transition Effect */
HomeActivity.this.overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
}
});
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.list_item, null);
}
TextView name_tv = (TextView) convertView.findViewById(R.id.name);
ImageView iv = (ImageView) convertView.findViewById(R.id.pic);
Home home = homelist.get(position);
name_tv.setText(home.getName());
iv.setImageResource(home.getPics());
return convertView;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
homelist.clear();
homelist.addAll((ArrayList<Home>) results.values);
notifyDataSetChanged();
}