在自定义listView中搜索，从工具栏- Kotlin
在自定义listView中搜索，从工具栏- Kotlin
提问于 2019-06-11 10:21:38
当我在工具栏中写东西的时候，我需要过滤我的列表视图。
CustomList:这是一个有3个textView的布局。FullList:这是一个带有ListView的活动
我从SQLite表填充FullList
FullList.kt：
override fun onCreate(savedInstanceState: Bundle?) {
...
setSupportActionBar(toolbar)
supportActionBar!!.setDisplayHomeAsUpEnabled(true)
var listView = findViewById<ListView>(R.id.listView)
val customAdptor = CustomAdapterListView(this)
listView.adapter=customAdptor
}
class CustomAdapterBJCP(private val context: Activity): BaseAdapter(){
var db = DataBaseHandler(context)
var data = db.DataExample()
override fun getView(p0: Int, p1: View?, p2: ViewGroup?): View {
val inflater = context.layoutInflater
val view1 = inflater.inflate(R.layout.CustomList,null)
var fName= view1.findViewById<TextView>(R.id.txtOne)
var FDetail= view1.findViewById<TextView>(R.id.txtTwo)
var fCount = view1.findViewById<TextView>(R.id.txtThree)
fName.text = data[p0].name
FDetail.text = data[p0].detail
fCount .text= data[p0].count
return view1
}
override fun getItem(p0: Int): Any {
return data.get(p0).name
}
override fun getItemId(p0: Int): Long {
return p0.toLong()
}
override fun getCount(): Int {
return data.size
}
}为了搜索listView，我实现了一个菜单项：
<menu...>
<item android:id="@+id/action_search"
android:title="Search"
app:showAsAction="always|collapseActionView"
android:icon="@android:drawable/ic_menu_search"
app:actionViewClass="android.support.v7.widget.SearchView" />
</menu>出于这个原因，我决定在FullList.kt中创建这个函数：
...
override fun onCreateOptionsMenu(menu: Menu): Boolean {
menuInflater.inflate(R.menu.menu_main,menu)
val searchItem = menu.findItem(R.id.action_search)
if(searchItem!=null){
val searchView=searchItem.actionView as SearchView
searchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener{
override fun onQueryTextSubmit(query: String?): Boolean {
return true
}
override fun onQueryTextChange(newText: String?): Boolean {
return true
}
})
}
return super.onCreateOptionsMenu(menu)
}
...现在，我需要在搜索工具栏中放入一个单词，然后在ListView中查找该项目
我如何在Kotlin中做到这一点？
回答 1
Stack Overflow用户
回答已采纳
发布于 2019-06-11 14:05:32
我希望这对你有用。
在Create()方法的活动中，从本地数据库而不是适配器中获取数据。
所以onCreate()方法是：
override fun onCreate(savedInstanceState: Bundle?) {
...
setSupportActionBar(toolbar)
supportActionBar!!.setDisplayHomeAsUpEnabled(true)
var db = DataBaseHandler(context)
var data = db.DataExample() //this method must be return interms of your pojo class type.
var listView = findViewById<ListView>(R.id.listView)
val customAdptor = CustomAdapterBJCP(this,data)
listView.adapter=customAdptor
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
menuInflater.inflate(R.menu.menu_main,menu)
val searchItem = menu.findItem(R.id.action_search)
if(searchItem!=null){
val searchView=searchItem.actionView as SearchView
searchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener {
override fun onQueryTextSubmit(query: String?): Boolean {
return true
}
override fun onQueryTextChange(newText: String?): Boolean {
if (newText != null) {
/* var dataList : List<Your Pojo Class> = list.filter { it.name.startsWith(newText) }
.sortedBy { it.name }*/
var dataList: MutableList<Your Pojo Class> = data.filter { it.name.startsWith(newText) }.toMutableList() // data is list (i.e you get data from db)
if (dataList.size.equals(0)) {
Toast.makeText(this@MainActivity, "No Record Found", Toast.LENGTH_SHORT).show()
}
for (item in dataList) {
System.out.println("Searched Data: " + item.name)
}
customAdptor = CustomAdapterBJCP(dataList , this@Your Activity)
listView.adapter = customAdptor
customAdptor?.notifyDataSetChanged
}
return true
}
})
}
return super.onCreateOptionsMenu(menu)
}修改适配器
class CustomAdapterBJCP(private val context: Context, var data: MutableList<Your Pojo Class>)BaseAdapter(){
// var db = DataBaseHandler(context)
//var data = db.DataExample()
override fun getView(p0: Int, p1: View?, p2: ViewGroup?): View {
val inflater = context.layoutInflater
val view1 = inflater.inflate(R.layout.CustomList,null)
var fName= view1.findViewById<TextView>(R.id.txtOne)
var FDetail= view1.findViewById<TextView>(R.id.txtTwo)
var fCount = view1.findViewById<TextView>(R.id.txtThree)
fName.text = data.get(p0).name
FDetail.text = data.get(p0).detail
fCount .text= data.get(p0).count
return view1
}
override fun getItem(p0: Int): Any {
return data.get(p0).name
}
override fun getItemId(p0: Int): Long {
return p0.toLong()
}
override fun getCount(): Int {
return data.count()
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/56535633
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