У меня проблема с использованием listView, потому что я отображаю много изображений в listview (о памяти)
Мне нужно преобразовать listview в recyclerview
Проблема:
Когда я показываю изображения на моем телефоне, используя последний вид, вы делаете много блокировок памяти, и это привело к остановке приложения, поэтому я хочу преобразовать представление списка в RecycleView.
MainActivity:
package com.masreta87.hussain
import android.app.Activity
import android.content.pm.PackageManager
import android.graphics.Bitmap
import android.graphics.drawable.BitmapDrawable
import android.os.Build
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.os.Environment
import android.view.View
import android.widget.AdapterView
import android.widget.ImageView
import android.widget.ListView
import android.widget.Toast
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import androidx.core.view.get
import java.io.File
import java.io.FileOutputStream
import java.io.OutputStream
import java.lang.Exception
import java.util.jar.Manifest
import androidx.core.content.ContextCompat.getSystemService
import android.icu.lang.UCharacter.GraphemeClusterBreak.T
import androidx.core.app.ComponentActivity.ExtraData
import androidx.core.content.ContextCompat.getSystemService
import android.icu.lang.UCharacter.GraphemeClusterBreak.T
import android.util.Log
import kotlinx.android.synthetic.*
class MainActivity : AppCompatActivity() {
lateinit var Img:ListView
lateinit var ImgArr:ArrayList<DataImg>
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
Img=findViewById(R.id.listviewB)
ImgArr=ArrayList()
ImgArr.add(DataImg(R.drawable.h))
ImgArr.add(DataImg(R.drawable.hh))
ImgArr.add(DataImg(R.drawable.hhh))
ImgArr.add(DataImg(R.drawable.v2))
ImgArr.add(DataImg(R.drawable.v3))
ImgArr.add(DataImg(R.drawable.v4))
ImgArr.add(DataImg(R.drawable.v5))
ImgArr.add(DataImg(R.drawable.v6))
//ImgArr.add(DataImg(R.drawable.v7))
ImgArr.add(DataImg(R.drawable.v8))
ImgArr.add(DataImg(R.drawable.v9))
Img.adapter=customAdapter(applicationContext,ImgArr)
Img.setOnItemClickListener{parent:AdapterView<*>, view:View, position:Int, id:Long ->
var ImgNa=ImgArr.get(position).image.toString()
Log.d("this",ImgNa)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
if (ContextCompat.checkSelfPermission(this,android.Manifest.permission.WRITE_EXTERNAL_STORAGE )
!=PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(this, arrayOf(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
,100)
}else{
saveImageToStorage(ImgNa)
}
}else{
saveImageToStorage(ImgNa)
}
}
}
override fun onRequestPermissionsResult(
requestCode: Int,
permissions: Array<out String>,
grantResults: IntArray
) {
if (requestCode==100){
if (grantResults.isNotEmpty() && grantResults[0]==PackageManager.PERMISSION_GRANTED){
// saveImageToStorage(ImgNa)
}else{
Toast.makeText(this,"No Permission for save",Toast.LENGTH_SHORT).show()
}
}
}
public fun saveImageToStorage(ImgNa:String){
val externalStorageState=Environment.getExternalStorageState()
if (externalStorageState.equals(Environment.MEDIA_MOUNTED)){
val storeDirectory=Environment.getExternalStorageDirectory().toString()
val rnds = (1000..100000000000).random().toString()
val file=File(storeDirectory,"$rnds.png")//Namephoto
try {
Log.d("output",ImgNa)
val stream:OutputStream =FileOutputStream(file)
var drawable=ContextCompat.getDrawable(applicationContext,ImgNa.toInt()) //edit
var bitmap=(drawable as BitmapDrawable).bitmap
bitmap.compress(Bitmap.CompressFormat.PNG,100,stream)
stream.flush()
stream.close()
Toast.makeText(this,"Image Saved",Toast.LENGTH_LONG).show()
}catch (e:Exception){
e.printStackTrace()
}
}else{
Toast.makeText(this,"unable to access the storage",Toast.LENGTH_SHORT).show()
}
}
}
И настраиваемый адаптер
package com.masreta87.hussain
import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.BaseAdapter
import android.widget.ImageView
class customAdapter(var context: Context,var data:ArrayList<DataImg>) :BaseAdapter(){
private class ViewHolder(row:View?){
var ivImage:ImageView
init {
this.ivImage=row?.findViewById(R.id.imageViewN) as ImageView
}
}
override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
var view:View?
var viewHolder:ViewHolder
if(convertView==null){
var layout=LayoutInflater.from(context)
view=layout.inflate(R.layout.listview_item,parent,false)
viewHolder=ViewHolder(view)
view.tag=viewHolder
}else{
view=convertView
viewHolder=view.tag as ViewHolder
}
var data:DataImg=getItem(position) as DataImg
viewHolder.ivImage.setImageResource(data.image)
return view as View
}
override fun getItem(position: Int): Any {
return data.get(position)
}
override fun getItemId(position: Int): Long {
return position.toLong()
}
override fun getCount(): Int {
return data.count()
}
}
И DataImg:
package com.masreta87.hussain
class DataImg(var image:Int) {
}
activity_Main. 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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<ListView
android:id="@+id/listviewB"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</RelativeLayout>
listview_item. xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/imageViewN"
android:background="@drawable/image_border"
android:layout_width="match_parent"
android:scaleType="fitXY"
android:layout_height="200dp"
/>
</LinearLayout>