问题描述
我有一个回收站视图，并且必须在回收站视图中设置图像。我已经获得许可并以表格的形式获取了图像，但是必须从表格中将其发送到recyclerview卡中。
我尝试了位图处理，但没有成功。
MainActivity：
package com.example.itemgetset
import android.annotation.SuppressLint
import android.app.Activity
import android.content.Intent
import android.os.Bundle
import android.os.Handler
import android.os.Message
import android.view.Menu
import android.view.MenuItem
import android.view.View
import android.widget.Button
import android.widget.LinearLayout
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
@Suppress("DEPRECATION")
class MainActivity : AppCompatActivity() {
lateinit var activity: Activity
val userList = ArrayList<ProductInfoGetSet>()
private lateinit var btnProductAdd: Button
lateinit var llEmptyView: LinearLayout
lateinit var llMain: LinearLayout
lateinit var recyclerView: RecyclerView
private lateinit var llFab: LinearLayout
private lateinit var linearLayoutManager: LinearLayoutManager
private lateinit var gridLayoutManager: GridLayoutManager
private lateinit var adapter: CustomAdapter
private var isforlist = true
companion object {
var handler: Handler = Handler()
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
activity = this
initView()
onClicks()
setUpData()
handler = @SuppressLint("HandlerLeak")
object : Handler() {
override fun handleMessage(msg: Message) {
if (msg.what == 111) {
val temp: Temp = msg.obj as Temp
if (temp.id == "") {
userList.add(
ProductInfoGetSet(
(userList.size + 1).toString(),temp.image,temp.name,temp.quantity,temp.price,)
)
adapter = CustomAdapter(activity,userList,isforlist)
recyclerView.adapter = adapter
} else {
for (i in userList.indices) {
if (userList[i].id == temp.id) {
userList[i].id = temp.id
userList[i].image = temp.image
userList[i].name = temp.name
userList[i].quantity = temp.quantity
userList[i].price = temp.price
}
}
adapter.notifyDataSetChanged()
}
}
if (userList.size > 0) {
llEmptyView.visibility = View.GONE
llMain.visibility = View.VISIBLE
} else {
llEmptyView.visibility = View.VISIBLE
llMain.visibility = View.GONE
}
}
}
}
private fun changeLayoutManager() {
if (recyclerView.layoutManager == linearLayoutManager) {
recyclerView.layoutManager = gridLayoutManager
} else {
recyclerView.layoutManager = linearLayoutManager
}
}
private fun initView() {
btnProductAdd = findViewById(R.id.btn_product_add)
llFab = findViewById(R.id.ll_fab)
llEmptyView = findViewById(R.id.llEmptyView)
llMain = findViewById(R.id.llMain)
recyclerView = findViewById(R.id.recycler_view)
recyclerView.layoutManager = LinearLayoutManager(this)
linearLayoutManager = LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false)
gridLayoutManager = GridLayoutManager(this,2)
}
private fun onClicks() {
btnProductAdd.setOnClickListener {
val intent = Intent(this@MainActivity,AddDetails::class.java)
intent.putExtra("isFor","Add")
startActivity(intent)
}
llFab.setOnClickListener {
val intent = Intent(this@MainActivity,"Add")
startActivity(intent)
}
}
private fun setUpData() {
if (userList.size > 0) {
llEmptyView.visibility = View.GONE
llMain.visibility = View.VISIBLE
} else {
llEmptyView.visibility = View.VISIBLE
llMain.visibility = View.GONE
}
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
menuInflater.inflate(R.menu.menu_main,menu)
return true
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
if (item.itemId == R.id.menu_view) {
if (userList.size > 0) {
changeLayoutManager()
}
return true
}
return super.onOptionsItemSelected(item)
}
}
CustomAdapter：
package com.example.itemgetset
import android.app.Activity
import android.app.AlertDialog
import android.content.ContentValues.TAG
import android.content.Intent
import android.os.Build
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.LinearLayout
import android.widget.PopupMenu
import android.widget.TextView
import androidx.annotation.RequiresApi
import androidx.recyclerview.widget.RecyclerView
import com.google.android.material.snackbar.Snackbar
@Suppress("UNREACHABLE_CODE")
class CustomAdapter(
private var activity: Activity,private val userList: ArrayList<ProductInfoGetSet>,private var isforlist: Boolean,) :
RecyclerView.Adapter<CustomAdapter.ViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup,viewType: Int): ViewHolder {
val itemview =
LayoutInflater.from(parent.context).inflate(R.layout.list_layout,parent,false)
return ViewHolder(itemview)
}
@RequiresApi(Build.VERSION_CODES.N)
override fun onBindViewHolder(holder: ViewHolder,position: Int) {
val productInfoGetSet: ProductInfoGetSet = userList[position]
holder.txtId.text = productInfoGetSet.id
holder.txtName.text = productInfoGetSet.name
holder.txtQuantity.text = productInfoGetSet.quantity
holder.txtPrice.text = productInfoGetSet.price
val id = userList[position].id
Log.e(TAG,"List item ID: $id")
holder.buttonViewOption.setOnClickListener {
val popup = PopupMenu(activity,holder.buttonViewOption)
popup.inflate(R.menu.pop_menu)
popup.setOnMenuItemClickListener { item ->
when (item.itemId) {
R.id.edit -> {
val intent = Intent(activity,AddDetails::class.java)
intent.putExtra("isFor","Update")
intent.putExtra("id",productInfoGetSet.id)
intent.putExtra("image",productInfoGetSet.image)
intent.putExtra("name",productInfoGetSet.name)
intent.putExtra("quantity",productInfoGetSet.quantity)
intent.putExtra("price",productInfoGetSet.price)
activity.startActivity(intent)
}
R.id.delete -> {
val builder = AlertDialog.Builder(activity)
builder.setTitle("Delete")
builder.setMessage("Do you want to delete the item?")
builder.setPositiveButton("Yes") { _,_ ->
userList.removeAt(position)
notifyItemRemoved(position)
val snack = Snackbar
.make(
holder.linearly,"Item was removed from the list.",Snackbar.LENGTH_SHORT
)
snack.show()
}
builder.setNegativeButton("No") { _,_ ->
}
val dialog: AlertDialog = builder.create()
dialog.show()
}
}
false
}
popup.show()
}
}
override fun getItemId(position: Int): Long {
return position.toLong()
}
override fun getItemCount(): Int {
return userList.size
}
class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
val txtName = itemView.findViewById<TextView>(R.id.txt_name)
val txtId = itemView.findViewById(R.id.txt_id) as TextView
var imgList = itemView.findViewById(R.id.img_list) as ImageView
val txtQuantity = itemView.findViewById(R.id.txt_quantity) as TextView
val txtPrice = itemView.findViewById(R.id.txt_price) as TextView
val linearly: LinearLayout = itemView.findViewById(R.id.linearlayout)
val buttonViewOption = itemView.findViewById<View>(R.id.txt_Options) as TextView
}
}
添加详细信息：
package com.example.itemgetset
import android.annotation.SuppressLint
import android.app.Activity
import android.content.Intent
import android.content.pm.PackageManager
import android.database.Cursor
import android.graphics.Bitmap
import android.graphics.BitmapFactory
import android.net.Uri
import android.os.Build
import android.os.Bundle
import android.os.Message
import android.provider.MediaStore
import android.widget.Button
import android.widget.EditText
import android.widget.ImageView
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
class AddDetails : AppCompatActivity() {
private lateinit var btnSubmit: Button
private lateinit var edtName: EditText
private lateinit var edtQuantity: EditText
private lateinit var edtPrice: EditText
private lateinit var imageview: ImageView
companion object {
private const val IMAGE_PICK_CODE = 1000
private const val PERMISSION_CODE = 1001
}
@SuppressLint("SetTextI18n","ResourceType")
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.add_item)
supportActionBar?.hide()
findViewById()
onclick()
if (intent.getStringExtra("isFor").equals("Update")) {
intent.getStringExtra("image")?.toInt()?.let { imageview.setImageResource(it) }
edtName.setText(intent.getStringExtra("name"))
edtQuantity.setText(intent.getStringExtra("quantity"))
edtPrice.setText(intent.getStringExtra("price"))
}
}
private fun findViewById() {
btnSubmit = findViewById(R.id.btn_submit)
edtName = findViewById(R.id.edt_name)
edtQuantity = findViewById(R.id.edt_quantity)
edtPrice = findViewById(R.id.edt_price)
imageview = findViewById(R.id.img_add)
}
@SuppressLint("ResourceType")
private fun onclick() {
btnSubmit.setOnClickListener {
when {
edtName.text.trim().isEmpty() -> {
edtName.error = "Please Enter Product Name"
Toast.makeText(
applicationContext,"Please Enter Product Name",Toast.LENGTH_SHORT
)
.show()
}
edtQuantity.text.trim().isEmpty() -> {
edtQuantity.error = "Please Enter Product Quantity"
Toast.makeText(
applicationContext,"Please Enter Product Quantity",Toast.LENGTH_SHORT
).show()
}
edtPrice.text.trim().isEmpty() -> {
edtPrice.error = "Please Enter Product Price"
Toast.makeText(
applicationContext,"Please Enter Product Price",Toast.LENGTH_SHORT
)
.show()
}
else -> {
Toast.makeText(
applicationContext,"Product Added Successfully ",Toast.LENGTH_SHORT
).show()
val temp = Temp()
temp.image = imageview.()
temp.name = edtName.text.toString()
temp.quantity = edtQuantity.text.toString()
temp.price = edtPrice.text.toString()
if (intent.getStringExtra("isFor").equals("Update")) {
temp.id = intent.getStringExtra("id").toString()
}
val message: Message = Message.obtain()
message.what = 111
message.obj = temp
MainActivity.handler.sendMessage(message)
finish()
}
}
}
imageview.setOnClickListener {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (checkSelfPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE) ==
PackageManager.PERMISSION_DENIED
) {
val permissions = arrayOf(android.Manifest.permission.READ_EXTERNAL_STORAGE)
requestPermissions(permissions,PERMISSION_CODE)
} else {
pickImageFromGallery()
}
} else {
pickImageFromGallery()
}
}
}
override fun onRequestPermissionsResult(
requestCode: Int,permissions: Array<out String>,grantResults: IntArray,) {
when (requestCode) {
PERMISSION_CODE -> {
if (grantResults.isNotEmpty() && grantResults[0] ==
PackageManager.PERMISSION_GRANTED
) {
pickImageFromGallery()
} else {
Toast.makeText(this,"Permission denied",Toast.LENGTH_SHORT).show()
}
}
}
super.onRequestPermissionsResult(requestCode,permissions,grantResults)
}
private fun pickImageFromGallery() {
val intent = Intent(Intent.ACTION_PICK)
intent.type = "image/*"
startActivityForResult(intent,IMAGE_PICK_CODE)
}
override fun onActivityResult(requestCode: Int,resultCode: Int,data: Intent?) {
super.onActivityResult(requestCode,resultCode,data)
if (requestCode == IMAGE_PICK_CODE && resultCode == RESULT_OK && data != null) {
val pickedImage: Uri? = data.data
val filePath = arrayOf(MediaStore.Images.Media.DATA)
val cursor: Cursor? =
pickedImage?.let { contentResolver.query(it,filePath,null,null) }
cursor?.moveToFirst()
val imagePath: String = cursor?.getString(cursor.getColumnIndex(filePath[0]))!!
val options = BitmapFactory.Options()
options.inPreferredConfig = Bitmap.Config.ARGB_8888
val bitmap = BitmapFactory.decodeFile(imagePath,options)
// Do something with the bitmap
intent = Intent(applicationContext,CustomAdapter::class.java)
intent.putExtra("image",bitmap)
startActivity(intent)
// At the end remember to close the cursor or you will end with the RuntimeException!
cursor.close()
}
}
}
温度Kt：
package com.example.itemgetset
class Temp {
var id: String = ""
var image = ""
var name: String = ""
var quantity: String = ""
var price: String = ""
}
ProductInfoGetSet: -
package com.example.itemgetset
import android.widget.ImageView
class ProductInfoGetSet(
var id: String,var image: String,var name: String,var quantity: String,var price: String
)
Logcat：
2020-09-10 17:33:00.170 9328-9328/? E/mple.itemgetse: Unknown bits set in runtime_flags: 0x28000
2020-09-10 17:33:11.669 9328-9328/com.example.itemgetset E/BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: /storage/emulated/0/Pictures/Instagram/IMG_20200830_174335_408.jpg: open failed: EACCES (Permission denied)
2020-09-10 17:33:11.672 9328-9328/com.example.itemgetset E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.itemgetset,PID: 9328
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null,request=1000,result=-1,data=Intent { dat=content://com.google.android.apps.photos.contentprovider/-1/1/content://media/external/images/media/498/ORIGINAL/NONE/image/jpeg/1143469803 flg=0x1 clip={text/uri-list U:content://com.google.android.apps.photos.contentprovider/-1/1/content%3A%2F%2Fmedia%2Fexternal%2Fimages%2Fmedia%2F498/ORIGINAL/NONE/image%2Fjpeg/1143469803} }} to activity {com.example.itemgetset/com.example.itemgetset.AddDetails}: java.lang.NullPointerException: BitmapFactory.decodeFile(imagePath,options) must not be null
at android.app.ActivityThread.deliverResults(ActivityThread.java:4973)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:5014)
at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:51)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2131)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7707)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:516)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
Caused by: java.lang.NullPointerException: BitmapFactory.decodeFile(imagePath,options) must not be null
at com.example.itemgetset.AddDetails.onActivityResult(AddDetails.kt:173)
at android.app.Activity.dispatchActivityResult(Activity.java:8145)
at android.app.ActivityThread.deliverResults(ActivityThread.java:4966)
如何在临时文件中定义imageview？
解决方法
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