my custom view looks as below
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package com.mypackage;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.RectShape;
import android.widget.ImageView;
public class CustomDrawableView extends ImageView {
// private ShapeDrawable mDrawable;
public int imageid = 0;
ShapeDrawable bgDrawable = null;
List<ShapeDrawable> ls = new ArrayList<ShapeDrawable>();
final int COUNT_SUMMERY = 3;
final int VERTICAL_OFFSET = 200;
final int HORIZENTAL_OFFSET = 20;
final int HORIZENTAL_GAP = 85;
final int VERTICAL_Y_POINT = 15;
final int VERTICAL_MAX_HEIGHT = 195;
final int HORIZENTAL_WIDTH = 60;
final int percentage[] = {25, 40, 35};
public CustomDrawableView(Context context, int id) {
super(context);
imageid = id;
switch(id) {
case R.drawable.summarychart:
for(int i = 0; i < COUNT_SUMMERY; i++) {
int x = HORIZENTAL_OFFSET + (HORIZENTAL_GAP *
i);
int width = HORIZENTAL_WIDTH;
int height = VERTICAL_MAX_HEIGHT *
percentage[i] / 100;
int y = VERTICAL_OFFSET + VERTICAL_Y_POINT +
VERTICAL_MAX_HEIGHT -
height;
ShapeDrawable objDrawable = new
ShapeDrawable(new RectShape());
int color = 0;
switch(i) {
case 0:
color = Color.RED;
break;
case 1:
color = Color.GREEN;
break;
case 2:
color = Color.YELLOW;
break;
}
objDrawable.getPaint().setColor(color);
objDrawable.setBounds(x, y, x + width, y +
height);
ls.add(objDrawable);
}
break;
default:
break;
}
int x = 0;
int y = 0;
int width = 320;
int height = 480;
bgDrawable = new ShapeDrawable(new RectShape());
bgDrawable.getPaint().setColor(0xffffffff);
bgDrawable.setBounds(x, y, x + width, y + height);
}
protected void onDraw(Canvas canvas) {
/* // Draw the white background
// bgDrawable.draw(canvas);
// Draw the bitmaps
Bitmap bmp = BitmapFactory.decodeResource(getResources(),
imageid);
canvas.drawBitmap(bmp, 0, VERTICAL_OFFSET, null);
*/ // Draw bars
super.onDraw(canvas);
for(int i = 0; i < COUNT_SUMMERY; i++) {
ShapeDrawable objDrawable = ls.get(i);
objDrawable.draw(canvas);
}
}
}
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now i do in layout
<com.mypackage.CustomDrawableView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/mychart" />
but in layout i see a message
NoSuchMethodException:com.mypackage.CustomDrawableView.<init>(Android.context.Context,
Android.util.AttributeSet)
and while i run it crashes. if i uncomment the drawable way, then it
works, but other layouts are not displayed.
any help is appreciated
thanksin advance
jags
_______________________________________________________________
On Jul 13, 9:45 pm, Matty <[email protected]> wrote:
> If you want to draw on top of an ImageView, I would extend it and
> override it's onDraw method. This provides you a [relative] canvas to
> draw on. Just be sure to call super.onDraw() if you want the image to
> show up also.
>
> On Jul 13, 11:23 am,Jags<[email protected]> wrote:
>
>
>
> > I am trying to put a background image and draw on top of that screen.
> > I assumed activity will have a on draw method, but it does not have.
> > it seems i need to use surfaceview. Can I put a surfaceview on top of
> > the image view and make it transparent ? any example/tutorial i can
> > refer to ?- Hide quoted text -
>
> - Show quoted text -
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