over 9 years ago
How to make Draw on a Canvas in Android. If you want to create Draw on a Canvas function check below example. In the below example I have created a Suraface class. Canvas works like as an interface. I have also used onDraw() method for drawing event.
Step(1)-MainActivity -
public class MainActivity extends Activity {
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- Suraface v = new Suraface(this);
- setContentView(v);
- }
- @Override
- public boolean onCreateOptionsMenu(Menu menu) {
- getMenuInflater().inflate(R.menu.main, menu);
- return true;
- }
- }
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Suraface v = new Suraface(this);
setContentView(v);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
Step(2)Suraface class-
- public class Suraface extends SurfaceView implements
- SurfaceHolder.Callback {
- Bitmap mBitmap;
- public SurafaceClass(Context context) {
- super(context);
- mBitmap = BitmapFactory.decodeResource(getResources(),
- R.drawable.ic_launcher);
- }
- @Override
- public void surfaceChanged(SurfaceHolder holder, int format, int width,
- int height) {
- }
- @Override
- public void surfaceCreated(SurfaceHolder holder) {
- }
- @Override
- public void surfaceDestroyed(SurfaceHolder holder) {
- }
- @Override
- protected void onDraw(Canvas canvas) {
- canvas.drawColor(Color.BLACK);
- }
- }
public class Suraface extends SurfaceView implements
SurfaceHolder.Callback {
Bitmap mBitmap;
public SurafaceClass(Context context) {
super(context);
mBitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.ic_launcher);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.BLACK);
}
}
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