如何将位图从第二个活动共享到第一个活动

Question

我是kotlin的新手，正在尝试发送位图。就像我在recyclerview卡中一样，我添加了一个图像，然后我必须编辑卡，这样我才能发送位图，有人能帮我吗。提前谢谢。

这是我的代码：

主要活动kt：-

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.util.Log
import android.view.Menu
import android.view.MenuItem
import android.view.View
import android.widget.Button
import android.widget.LinearLayout
import android.widget.Toast
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
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,
temp.total
)
)
adapter = CustomAdapter(activity, userList)
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
userList[i].total = temp.total
}
}
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
}
}
override fun onWindowFocusChanged(hasFocus: Boolean) {
super.onWindowFocusChanged(hasFocus)
if (hasFocus) Toast.makeText(applicationContext, "Phone Rotated", Toast.LENGTH_SHORT).show()
}
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, AddDetails::class.java)
intent.putExtra("isFor", "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)
}
}

自定义适配器.kt:-

package com.example.itemgetset
import android.R.attr.bitmap
import android.app.Activity
import android.app.AlertDialog
import android.content.ContentValues.TAG
import android.content.Intent
import android.graphics.Bitmap
import android.graphics.Bitmap.CompressFormat
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
import java.io.ByteArrayOutputStream

@Suppress("UNREACHABLE_CODE")
class CustomAdapter(
private var activity: Activity,
private val userList: ArrayList<ProductInfoGetSet>,
) :
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
holder.txtTotal.text = productInfoGetSet.total
holder.imgList.setImageBitmap(productInfoGetSet.image)
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")
val bStream = ByteArrayOutputStream()
productInfoGetSet.image?.compress(CompressFormat.PNG, 100, bStream)
val byteArray = bStream.toByteArray()
intent.putExtra("imagebitmap", byteArray)
intent.putExtra("id", productInfoGetSet.id)
intent.putExtra("name", productInfoGetSet.name)
intent.putExtra("quantity", productInfoGetSet.quantity)
intent.putExtra("price", productInfoGetSet.price)
intent.putExtra("total", productInfoGetSet.total)
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(R.id.txt_name) as TextView
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 txtTotal = itemView.findViewById(R.id.txt_result1) 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.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.text.Editable
import android.text.TextWatcher
import android.util.Log
import android.widget.*
import androidx.appcompat.app.AppCompatActivity

@Suppress("DEPRECATION")
class AddDetails : AppCompatActivity() {
private lateinit var btnSubmit: Button
private lateinit var edtName: EditText
private lateinit var img_add: ImageView
private var edtQuantity: EditText? = null
private var edtPrice: EditText? = null
private var txtResult: TextView? = null
private var txtTotal: TextView? = null
private var bitmap: Bitmap? = null
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()
edtPrice?.addTextChangedListener(priceWatcher)
edtQuantity?.addTextChangedListener(textWatcher)
if (intent.getStringExtra("isFor").equals("Update")) {
val byteArray = intent.getByteArrayExtra("imagebitmap")
bitmap = byteArray?.size?.let { BitmapFactory.decodeByteArray(byteArray, 0, it) }
img_add.setImageBitmap(bitmap)
edtName.setText(intent.getStringExtra("name"))
edtQuantity?.setText(intent.getStringExtra("quantity"))
edtPrice?.setText(intent.getStringExtra("price"))
}
}
private fun findViewById() {
btnSubmit = findViewById(R.id.btn_submit)
txtResult = findViewById(R.id.txt_result)
txtTotal = findViewById(R.id.txt_final)
edtName = findViewById(R.id.edt_name)
edtQuantity = findViewById(R.id.edt_quantity)
edtPrice = findViewById(R.id.edt_price)
img_add = 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 = bitmap
temp.name = edtName.text.toString()
temp.quantity = edtQuantity?.text.toString()
temp.price = edtPrice?.text.toString()
temp.total = txtResult?.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()
}
}
}
img_add.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()
}
}
}
private val priceWatcher = object : TextWatcher {
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
}
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
}
override fun afterTextChanged(s: Editable?) {
val num1: String = edtPrice?.text.toString()
val mnum1 = num1.toIntOrNull()
val num2: String = edtQuantity?.text.toString()
val mnum2 = num2.toIntOrNull()
val res = mnum2?.let { mnum1?.times(it) }
Log.e("<><> res1", res.toString())
txtResult?.text = res.toString()
}
}
private val textWatcher = object : TextWatcher {
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
}
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
}
override fun afterTextChanged(s: Editable?) {
val num1: String = edtPrice?.text.toString()
val mnum1 = num1.toIntOrNull()
val num2: String = edtQuantity?.text.toString()
val mnum2 = num2.toIntOrNull()
val res = mnum2?.let { mnum1?.times(it) }
Log.e("<><> res1", res.toString())
txtResult?.text = res.toString()
}
}
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) {
img_add.setImageURI(data.data)
val pickedImage: Uri? = data.data
val filePath = arrayOf(MediaStore.Images.Media.DATA)
val cursor: Cursor? =
pickedImage?.let { contentResolver.query(it, filePath, null, null, null) }
cursor?.moveToFirst()
val imagePath: String = cursor!!.getString(cursor.getColumnIndex(filePath[0]))
val options = BitmapFactory.Options()
options.inPreferredConfig = Bitmap.Config.ARGB_8888
bitmap = BitmapFactory.decodeFile(imagePath, options)
cursor.close()
}
}
}

Logcat：-

2020-09-14 19:46:21.834 26263-26263/? E/mple.itemgetse: Unknown bits set in runtime_flags: 0x28000
2020-09-14 19:46:43.406 26263-26263/com.example.itemgetset E/<><> res1: null
2020-09-14 19:46:43.754 26263-26263/com.example.itemgetset E/<><> res1: null
2020-09-14 19:46:45.992 26263-26263/com.example.itemgetset E/<><> res1: 32
2020-09-14 19:46:47.908 26263-26263/com.example.itemgetset E/<><> res1: null
2020-09-14 19:46:48.491 26263-26263/com.example.itemgetset E/<><> res1: 64
2020-09-14 19:46:51.002 26263-26263/com.example.itemgetset E/ContentValues: List item ID: 1
2020-09-14 19:46:54.533 26263-26263/com.example.itemgetset E/ContentValues: List item ID: 1
2020-09-14 19:46:55.167 26263-26263/com.example.itemgetset E/ContentValues: List item ID: 1
2020-09-14 19:47:02.993 26263-26263/com.example.itemgetset E/JavaBinder: !!! FAILED BINDER TRANSACTION !!!  (parcel size = 16777976)
2020-09-14 19:47:02.995 26263-26263/com.example.itemgetset E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.itemgetset, PID: 26263
java.lang.RuntimeException: Failure from system
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1904)
at android.app.Activity.startActivityForResult(Activity.java:5215)
at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:676)
at android.app.Activity.startActivityForResult(Activity.java:5173)
at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:663)
at android.app.Activity.startActivity(Activity.java:5544)
at android.app.Activity.startActivity(Activity.java:5512)
at com.example.itemgetset.CustomAdapter$onBindViewHolder$1$1.onMenuItemClick(CustomAdapter.kt:69)
at android.widget.PopupMenu$1.onMenuItemSelected(PopupMenu.java:108)
at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:787)
at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:151)
at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:934)
at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:924)
at com.android.internal.view.menu.MenuPopup.onItemClick(MenuPopup.java:128)
at android.widget.AdapterView.performItemClick(AdapterView.java:330)
at android.widget.AbsListView.performItemClick(AbsListView.java:1257)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:3265)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
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$MethodAndArgsCaller.run(RuntimeInit.java:516)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
Caused by: android.os.TransactionTooLargeException: data parcel size 16777976 bytes
at android.os.BinderProxy.transactNative(Native Method)
at android.os.BinderProxy.transact(BinderProxy.java:557)
at android.app.IActivityTaskManager$Stub$Proxy.startActivity(IActivityTaskManager.java:3887)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1898)
at android.app.Activity.startActivityForResult(Activity.java:5215) 
at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:676) 
at android.app.Activity.startActivityForResult(Activity.java:5173) 
at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:663) 
at android.app.Activity.startActivity(Activity.java:5544) 
at android.app.Activity.startActivity(Activity.java:5512) 
at com.example.itemgetset.CustomAdapter$onBindViewHolder$1$1.onMenuItemClick(CustomAdapter.kt:69) 
at android.widget.PopupMenu$1.onMenuItemSelected(PopupMenu.java:108) 
at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:787) 
at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:151) 
at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:934) 
at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:924) 
at com.android.internal.view.menu.MenuPopup.onItemClick(MenuPopup.java:128) 
at android.widget.AdapterView.performItemClick(AdapterView.java:330) 
at android.widget.AbsListView.performItemClick(AbsListView.java:1257) 
at android.widget.AbsListView$PerformClick.run(AbsListView.java:3265) 
at android.os.Handler.handleCallback(Handler.java:883) 
at android.os.Handler.dispatchMessage(Handler.java:100) 
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) 

从Customadpade到adddetails，我必须发送位图。

Answer 1

在onActivityResult中，您收到拾取的图像Uri，然后可以将其从一个活动传递到下一个活动，方法是将Uri转换为字符串，然后使用.putExtra((将其附加到意图，如下所示：

val intent = Intent(this, Activity::class.java)
intent.putExtra("Uri", imageUri)
startActivity(intent)

然后可以在下一个活动中通过以下方式接收信息：

if (intent.getStringExtra("Uri") != null){
val uri = intent.getStringExtra("Uri")
}

Uri将是字符串形式，所以您所要做的就是将其转换回Uri形式。

要将位图转换为Uri，请使用以下代码：

public Uri getImageUri(Context inContext, Bitmap inImage) {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
String path = MediaStore.Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
return Uri.parse(path);

}