How to convert Image into base64 String in Android?

AndroidApps/ApplicationsMobile Development

This example demonstrates how to do I in android.

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.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:padding="8dp"
   tools:context=".MainActivity">
<TextView
   android:id="@+id/textView"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:layout_centerInParent="true"
   android:textSize="12sp"
   android:textStyle="bold" />
</RelativeLayout>

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

import androidx.appcompat.app.AppCompatActivity;
import android.annotation.SuppressLint;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.Base64;
import android.widget.TextView;
import java.io.ByteArrayOutputStream;
public class MainActivity extends AppCompatActivity {
   TextView textView;
   @SuppressLint("WrongThread")
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      textView = findViewById(R.id.textView);
      ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
      Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.instaimage);
      bitmap.compress(Bitmap.CompressFormat.JPEG, 100, byteArrayOutputStream);
      byte[] imageBytes = byteArrayOutputStream.toByteArray();
      String imageString = Base64.encodeToString(imageBytes, Base64.DEFAULT);
      textView.setText(imageString);
   }
}

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="app.com.sample">
   <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 the android studio, open one of your project's activity files and click the RunPlay Icon icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −

raja
Updated on 07-Jul-2020 13:15:14

Advertisements