Work with Image without Libraries

app/build.gradle.kts

@@ -33,6 +33,9 @@ android {
     kotlinOptions {
         jvmTarget = "1.8"
     }
+    buildFeatures {
+        viewBinding = true
+    }
 }
 
 dependencies {

app/src/main/AndroidManifest.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
+    <uses-permission android:name="android.permission.INTERNET" />
 
     <application
         android:allowBackup="true"

app/src/main/java/com/example/workwithview/MainActivity.kt

@@ -1,11 +1,88 @@
 package com.example.workwithview
 
-import androidx.appcompat.app.AppCompatActivity
+import android.content.Context
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
 import android.os.Bundle
+import android.view.KeyEvent
+import android.view.View
+import android.view.inputmethod.EditorInfo
+import android.view.inputmethod.InputMethodManager
+import android.widget.TextView
+import android.widget.Toast
+import androidx.appcompat.app.AppCompatActivity
+import androidx.lifecycle.lifecycleScope
+import com.example.workwithview.databinding.ActivityMainBinding
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import java.net.URL
 
 class MainActivity : AppCompatActivity() {
+    private lateinit var binding: ActivityMainBinding
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_main)
+        binding = ActivityMainBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        binding.editText.setOnEditorActionListener(object : TextView.OnEditorActionListener {
+            override fun onEditorAction(v: TextView?, actionId: Int, event: KeyEvent?): Boolean {
+                if (actionId == EditorInfo.IME_ACTION_DONE || (event != null && event.action == KeyEvent.ACTION_DOWN && event.keyCode == KeyEvent.KEYCODE_ENTER)) {
+                    hideKeyboard()
+                    showProgressBar()
+                    loadImageFromUrl(v?.text.toString())
+                    return true
+                }
+                return false
+            }
+        })
+    }
+
+    private fun loadImageFromUrl(url: String) {
+        lifecycleScope.launch(Dispatchers.IO) {
+            try {
+                val bitmap = downloadBitmap(url)
+                withContext(Dispatchers.Main) {
+                    hideProgressBar()
+                    binding.imageView.setImageBitmap(bitmap)
+                }
+            } catch (e: Exception) {
+                withContext(Dispatchers.Main) {
+                    hideProgressBar()
+                    Toast.makeText(
+                        this@MainActivity,
+                        "Ошибка загрузки изображения $url",
+                        Toast.LENGTH_SHORT
+                    ).show()
+                }
+            }
+        }
+    }
+
+    private fun downloadBitmap(url: String): Bitmap {
+        val connection = URL(url).openConnection()
+            .apply {
+                connect()
+            }
+        val inputStream = connection.inputStream
+        return BitmapFactory.decodeStream(inputStream)
+    }
+
+    private fun hideKeyboard() {
+        val imm = getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
+        imm.hideSoftInputFromWindow(binding.editText.windowToken, 0)
+    }
+
+    private fun showProgressBar() {
+        binding.progressBar.visibility = View.VISIBLE
+        binding.imageView.visibility = View.GONE
+
+    }
+
+    private fun hideProgressBar() {
+        binding.progressBar.visibility = View.GONE
+        binding.imageView.visibility = View.VISIBLE
+
     }
 }

app/src/main/res/drawable/rounded_edittext.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="#FFFFFF" />
+
+    <stroke
+        android:width="2dp"
+        android:color="#FF0000" />
+
+    <corners android:radius="0dp" />
+</shape>

app/src/main/res/layout/activity_main.xml

@@ -6,13 +6,39 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-    <TextView
+    <ProgressBar
+        android:id="@+id/progressBar"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
+        android:visibility="gone"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <ImageView
+        android:id="@+id/imageView"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:layout_constraintBottom_toTopOf="@+id/editText"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        android:src="@drawable/placeholder_image"/>
+
+    <EditText
+        android:id="@+id/editText"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="50dp"
+        android:background="@drawable/rounded_edittext"
+        android:layout_marginHorizontal="50dp"
+        android:inputType="text"
+        android:text="https://picsum.photos/"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        android:layout_marginBottom="30dp"
+         />
+
 </androidx.constraintlayout.widget.ConstraintLayout>