android - 如何在listview kotlin中添加搜索过滤器栏
问题描述
我已经创建了一个列表视图并且代码工作正常。还创建了一个搜索框。我想根据列表的特定字段实现搜索功能。l 在分离类中使用的列表适配器不在主要活动类中。我想在类列表适配器中使用搜索栏过滤器。
主要活动课
package com.iraqairoirt.iraqairports
import android.app.AlertDialog
import android.os.AsyncTask
import android.support.design.widget.TabLayout
import android.support.v7.app.AppCompatActivity
import android.support.v4.app.Fragment
import android.support.v4.app.FragmentManager
import android.support.v4.app.FragmentPagerAdapter
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.fragment_arrivel.*
import kotlinx.android.synthetic.main.fragment_dep.*
import org.json.JSONArray
import org.json.JSONObject
import java.net.HttpURLConnection
import java.net.URL
import android.widget.TextView
import com.iraqairoirt.iraqairports.flightsDep.ListAdapteDep
import com.iraqairoirt.iraqairports.flightsArr.ListAdapteArr
class MainActivity : AppCompatActivity() {
private var mSectionsPagerAdapter: SectionsPagerAdapter? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val url = "xxxxxxxxxxxxxxxxxxxxxxx"
Arr().execute(url)
Dep().execute(url)
setSupportActionBar(toolbar)
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = SectionsPagerAdapter(supportFragmentManager)
// Set up the ViewPager with the sections adapter.
container.adapter = mSectionsPagerAdapter
container.addOnPageChangeListener(TabLayout.TabLayoutOnPageChangeListener(tabs))
tabs.addOnTabSelectedListener(TabLayout.ViewPagerOnTabSelectedListener(container))
}
// full class for json api
inner class Arr : AsyncTask<String, String, String>(){
val progressDialog = AlertDialog.Builder(this@MainActivity)
val dialogView = layoutInflater.inflate(R.layout.progress_dialog,null)
val message = dialogView.findViewById<TextView>(R.id.message_id)
val dialog = progressDialog.create()
override fun onPreExecute() {
super.onPreExecute()
dialog.setMessage("loading")
dialog.setCancelable(false)
dialog.show()
}
// for build connection
override fun doInBackground(vararg url: String?): String{
var text : String
val connection = URL(url[0]).openConnection() as HttpURLConnection
try {
connection.connect()
text = connection.inputStream.use { it.reader().use{reader -> reader.readText()} }
} finally{
connection.disconnect()
}
return text
}
override fun onPostExecute(result: String?) {
super.onPostExecute(result)
handleJson(result)
dialog.dismiss();
}
override fun onProgressUpdate(vararg text: String?) {
}
private fun handleJson (jsonString: String?){
val schedule = pluginData.getJSONObject("schedule")
val arrivals = schedule.getJSONObject("arrivals")
// val data = arrivals.getJSONObject("data")
val jsonArray = JSONArray(arrivals.get("data").toString())
val list = ArrayList<FlightShdu>()
var x = 0
while (x < jsonArray.length()){
val jsonObject = jsonArray.getJSONObject(x)
list.add(FlightShdu(
jsonObject.getJSONObject("flight").getJSONObject("identification").getJSONObject("number").getString("default"),
jsonObject.getJSONObject("flight").getJSONObject("airline").getString("short"),
jsonObject.getJSONObject("flight").getJSONObject("status").getJSONObject("generic").getJSONObject("status").getString("text"),
jsonObject.getJSONObject("flight").getJSONObject("airline").getJSONObject("code").getString("icao"),
jsonObject.getJSONObject("flight").getJSONObject("time").getJSONObject("scheduled").getString("arrival"),
jsonObject.getJSONObject("flight").getJSONObject("airport").getJSONObject("origin").getJSONObject("code").getString("iata"),
jsonObject.getJSONObject("flight").getJSONObject("aircraft").getJSONObject("model").getString("text"),
// for more information
jsonObject.getJSONObject("flight").getJSONObject("time").getJSONObject("real").getString("departure"),
jsonObject.getJSONObject("flight").getJSONObject("time").getJSONObject("estimated").getString("arrival"),
// jsonObject.getJSONObject("flight").getJSONObject("time").getJSONObject("estimated").getString("arrival"),
jsonObject.getJSONObject("flight").getJSONObject("aircraft").getString("registration"),
jsonObject.getJSONObject("flight").getJSONObject("status").getJSONObject("generic").getJSONObject("status").getString("diverted"),
arrivals.getString("timestamp"),
jsonObject.getJSONObject("flight").getJSONObject("status").getString("icon")
))
x++
}
list.forEach(::println)
val adapter = ListAdapteArr(this@MainActivity, list)
flight_arrivel_list.adapter = adapter
}
}
/**
* A [FragmentPagerAdapter] that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
inner class SectionsPagerAdapter(fm: FragmentManager) : FragmentPagerAdapter(fm) {
override fun getItem(position: Int): Fragment? {
return when (position) {
0 -> {
fragment_Arr()
}
1 ->{
fragment_Dep()
}
2->{
fragment_Weather()
}
else-> {
return null
}
}
}
override fun getCount(): Int {
// Show 3 total pages.
return 2
}
}
}
列表适配器
class ListAdapteArr (val context: MainActivity, val list: ArrayList<FlightShdu>): BaseAdapter() {
@SuppressLint("ViewHolder", "NewApi")
override fun getView(p0: Int, convertView: View?, parent: ViewGroup?): View {
val view : View = LayoutInflater.from(context).inflate(R.layout.arr_list,parent,false)
val searchBar = view.findViewById(R.id.searchFlightId) as MaterialSearchBar
Airport.text= list.Airport
return view
}
override fun getItem(p0: Int): Any {
return list [p0]
}
override fun getItemId(p0: Int): Long {
return p0.toLong()
}
override fun getCount(): Int {
return list.size
}
}
xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/flight_arrivel_list"
style="@style/Widget.AppCompat.ListView"
android:paddingStart="10sp"
android:paddingEnd="10sp"
android:paddingTop="0dp" android:layout_alignParentStart="true" android:layout_alignParentTop="true"
android:layout_marginTop="58dp" android:layout_marginStart="0dp"/>
<com.mancj.materialsearchbar.MaterialSearchBar
style="@style/MaterialSearchBarLight"
app:mt_speechMode="true"
app:mt_hint="Custom hint"
app:mt_maxSuggestionsCount="10"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/searchBar" />
</RelativeLayout>
l 添加了搜索栏过滤器来搜索列表视图中的任何项目，但仍然没有功能可以做到这一点
解决方案
在您的活动中，在您的列表中执行搜索并重新分配值（保留 a val baseList，var filteredList因此如果需要，您可以默认返回原始值。首先，我们要将嵌套适配器移动到活动的顶部，以便我们可以访问它在它实例化之后。我们还想为此使用两个列表，baseList就像filteredList我private lateinit var adapter: ListAdapteArr? = null在活动顶部的下面一样。
private lateinit var adapter: ListAdapteArr? = null
private var baseList: List<FlightShdu> = listOf()
private var filteredList: MutableList<FlightShdu> = mutableListOf()
在您的handleJson()方法中，一旦列表中填充了所有FlightShdu对象，请将其分配给baseList
baseList = list
然后分配你的private lateinit var adapter：
adapter = ListAdapteArr(this@MainActivity, baseList)
flight_arrivel_list.adapter = adapter
有一种方法可以获取编辑文本搜索词并将其与您的列表进行比较
fun searchList() {
filteredList.clear()
baseList.forEach {
if (it.contains(search.text.toString())) {
filteredList.add(it)
}
}
adapter.updateList(filteredList)
然后在您的适配器更改中：
val list: ArrayList<FlightShdu>至var list: ArrayList<FlightShdu>
并有一个方法，如：
fun updateList(filteredList: List<FlightShdu>) {
list.clear()
list.addAll(filteredList)
notifyDataSetChanged()
}
使用活动中的更新列表，调用该方法adapter.updateList(filteredList)
我还建议使用 arecyclerview而不是listview
RecyclerView 与 ListView
您还可以考虑使用DiffUtils它，因为它在适配器中的列表之间转换时提供了很好的平滑动画。这个答案只是为了让你滚蛋。
val diffResult = DiffUtil.calculateDiff(object : DiffUtil.Callback() {
override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean = newList[newItemPosition] == oldList[oldItemPosition]
override fun getOldListSize(): Int = oldList.size
override fun getNewListSize(): Int = newList.size
override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean = newList[newItemPosition] == oldList[oldItemPosition]
}
diffResult.dispatchUpdatesTo(adapter)
推荐阅读
- delphi - 将 PNG 资源加载到 TGPImage
- google-app-engine - 如何在 Java 8 模式下运行 IntelliJ 的 Google App Engine Dev Server 插件
- apache-flink - Apache flink - 阅读后将文件移动到不同的文件夹
- vue.js - vue.js pass function to component as prop
- javascript - Display several images with vuejs
- typescript - Typescript Promise 文件上传
- php - How to show multiple images by ajax success
- node.js - Issue connecting to Mongo Atlas from Apostrophe CMS application on Elastic Beanstalk
- node.js - Mongoose populate not working as expected
- date - 比较日期范围内的注册表字符串值