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How to convert an image to Base 64 string on Android?
This example demonstrates how do I convert an image to Base 64 string on 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" tools:context=".MainActivity"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/textView" android:padding="4dp"/> </RelativeLayout>
Step 3 – Copy paste an image in the res/drawable. Example: res/drawable/logo.png
Step 4 − Add the following code to src/MainActivity.java
import android.annotation.SuppressLint; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Base64; import android.widget.TextView; import java.io.ByteArrayOutputStream; public class MainActivity extends AppCompatActivity { TextView textView; String string; Bitmap bitmap; @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 = BitmapFactory.decodeResource(getResources(),R.drawable.logo); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, byteArrayOutputStream); byte[] bytes = byteArrayOutputStream.toByteArray(); string = Base64.encodeToString(bytes, Base64.DEFAULT); textView.setText(string); } }
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 android studio, open one of your project's activity files and click Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen –
Click here to download the project code.
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