How to convert a Drawable to a Bitmap in Android using Kotlin?

This example demonstrates how to convert a Drawable to a Bitmap in Android using Kotlin.

Step 1 − Create a new project in Android Studio, go to File? New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

Example

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:gravity="center"
   android:orientation="vertical"
   android:padding="4dp"
   tools:context=".MainActivity">
<ImageView
   android:id="@+id/imageView"
   android:layout_width="match_parent"
   android:layout_height="wrap_content" />
<Button
   android:id="@+id/btnConvert"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:text="Convert Drawable to Bitmap" />
</LinearLayout>

Step 3 − Add the following code to src/MainActivity.kt

import android.graphics.BitmapFactory
import android.os.Bundle
import android.widget.Button
import android.widget.ImageView
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
class MainActivity : AppCompatActivity() {
   override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      setContentView(R.layout.activity_main)
      title = "KotlinApp"
      val imageView: ImageView = findViewById(R.id.imageView)
      val btnConvert: Button = findViewById(R.id.btnConvert)
      btnConvert.setOnClickListener {
         val bitmap = BitmapFactory.decodeResource(resources, R.drawable.image)
         imageView.setImageBitmap(bitmap)
         Toast.makeText(applicationContext, "Image converted to Bitmap",
         Toast.LENGTH_SHORT).show()
      }
   }
}

Step 4 − Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.q11">
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
      <activity android:name=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen

Azhar

Updated on: 21-Jul-2020

2K+ Views

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