How to draw a rectangle on a canvas in Android

Instead of showing default activity layout, we can create our custom class. Here in this example I’m going to share a script to draw a rectangle on a canvas in Android.

This codes for your Main Activity:

package com.zofiakreasi.canvastest;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(new CustomView(this));

    }
}

And this one for your custom class called CustomView.java

package com.zofiakreasi.canvastest;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.view.View;

/**
 * Created by user on 10/10/2017.
 */
public class CustomView extends View {
    private Rect rectangle;
    private Paint paint;

    boolean notRunning = false;

    public CustomView(Context context){
        super(context);
        int x = 50;
        int y = 50;
        int sideLength = 200;

        //create rectangle
        rectangle = new Rect(x, y, sideLength, sideLength);

        //create paint and set its color
        paint = new Paint();
        paint.setColor(Color.GRAY);

    }

    @Override
    protected void onDraw(Canvas canvas){
        canvas.drawColor(Color.BLUE);
        canvas.drawRect(rectangle, paint);
    }
}