How to draw the content of a canvas on SurfaceView and ImageView in your Android App?

In this video it shows how one can draw certain objects on a canvas and then print it on a surface view or image view so that it is visible in the layout of the App.

I hope you like this video. For any questions, suggestions or appreciation please contact us at: https://programmerworld.co/contact/ or email at: programmerworld1990@gmail.com

Complete source code:

package com.programmerworld.canvasonsurfaceviewandimageview;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

private SurfaceView surfaceView;
private SurfaceHolder surfaceHolder;
private ImageView imageView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

surfaceView = findViewById(R.id.surfaceView);
surfaceHolder = surfaceView.getHolder();
imageView = findViewById(R.id.imageView);
}

public void buttonDrawCanvas(View view){
Bitmap bitmap = Bitmap.createBitmap(surfaceView.getWidth(), surfaceView.getHeight(), Bitmap.Config.ARGB_8888);
Paint paint = new Paint();
paint.setColor(Color.RED);
paint.setAntiAlias(true);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(8);

Canvas canvas = new Canvas(bitmap);
canvas.drawCircle(bitmap.getWidth()/2, bitmap.getHeight()/2, bitmap.getWidth()/5, paint);
imageView.setImageBitmap(bitmap);

canvas = surfaceHolder.lockCanvas();
canvas.drawCircle(bitmap.getWidth()/2, bitmap.getHeight()/2, bitmap.getWidth()/5, paint);
surfaceHolder.unlockCanvasAndPost(canvas);
}
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="100dp"
android:layout_marginTop="44dp"
android:onClick="buttonDrawCanvas"
android:text="Draw the Canvas"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />

<ImageView
android:id="@+id/imageView"
android:layout_width="167dp"
android:layout_height="129dp"
android:layout_marginStart="112dp"
android:layout_marginTop="33dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/surfaceView"
app:srcCompat="@drawable/ic_launcher_background" />

<SurfaceView
android:id="@+id/surfaceView"
android:layout_width="226dp"
android:layout_height="221dp"
android:layout_marginStart="92dp"
android:layout_marginTop="35dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button" />
</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="100dp"
android:layout_marginTop="44dp"
android:onClick="buttonDrawCanvas"
android:text="Draw the Canvas"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />

<ImageView
android:id="@+id/imageView"
android:layout_width="167dp"
android:layout_height="129dp"
android:layout_marginStart="112dp"
android:layout_marginTop="33dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/surfaceView"
app:srcCompat="@drawable/ic_launcher_background" />

<SurfaceView
android:id="@+id/surfaceView"
android:layout_width="226dp"
android:layout_height="221dp"
android:layout_marginStart="92dp"
android:layout_marginTop="35dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button" />
</androidx.constraintlayout.widget.ConstraintLayout>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.programmerworld.canvasonsurfaceviewandimageview">

<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/Theme.CanvasOnSurfaceViewAndImageView">
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

Leave a Reply

%d bloggers like this:
Available for Amazon Prime