019 Java Android Program to Draw on a Canvas
Posted by Superadmin on December 21 2015 05:09:03

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Here is source code of the Program to Draw on a Canvas in Android. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.
Main Activity

package com.example.draw_canvas;

import android.app.Activity;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Menu;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setContentView(R.layout.activity_main);
SurafaceClass v = new SurafaceClass(this);
setContentView(v);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}


Surface Class

package com.example.draw_canvas;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class SurafaceClass extends SurfaceView implements
SurfaceHolder.Callback {
Bitmap mBitmap;

public SurafaceClass(Context context) {
super(context);
mBitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.ic_launcher);
// TODO Auto-generated constructor stub
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub

}

@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub

}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub

}

@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.BLACK);
}

}