Thats how I do it in my apps.
On May 5, 4:30 am, Mariano Kamp <mariano.k...@gmail.com> wrote:
> The onDraw() method starts from the scratch every time and so doesn't keep
> your drawings from the last invocation. Instead you would need to save all
> the previous points yourself and use them in onDraw().
>
> On Tue, May 5, 2009 at 9:25 AM, Sukitha Udugamasooriya
> <suk...@gmail.com>wrote:
>
>
>
> > I want to draw strokes on my screen when the user touches. Next stroke
> > should be drawn from the end point
> > of the previous stroke.
> > This is my code. What happens here is just only the current stroke is
> > drawn. Previous strokes are vanished? What is wrong here? Please
> > help..
>
> > package src.test;
>
> > import android.app.Activity;
> > import android.content.Context;
> > import android.graphics.Bitmap;
> > import android.graphics.Canvas;
> > import android.graphics.Color;
> > import android.graphics.Paint;
> > import android.os.Bundle;
> > import android.view.MotionEvent;
> > import android.view.View;
> > import android.view.View.OnTouchListener;
>
> > public class ActDraw extends Activity implements OnTouchListener {
>
> > float x = 200;
> > float y = 200;
> > float x1 = 10;
> > float y1 = 45;
> > float prvx = 150;
> > float prvy = 150;
> > MyView m;
>
> > �...@override
> > public void onCreate(Bundle savedInstanceState) {
> > super.onCreate(savedInstanceState);
>
> > m = new MyView(this);
> > m.setOnTouchListener(this);
> > setContentView(m);
>
> > }
> > public boolean onTouch(View v, MotionEvent event) {
> > switch (event.getAction()) {
> > case MotionEvent.ACTION_DOWN: {
> > prvx = x;
> > prvy = y;
> > x = event.getX();
> > y = event.getY();
> > m.invalidate();
> > }
> > }
> > return false;
> > }
>
> > class MyView extends View {
> > Paint p = new Paint();
> > Bitmap bm;
> > int i;
>
> > public MyView(Context context) {
> > super(context);
>
> > }
>
> > �...@override
> > protected void onDraw(Canvas canvas) {
> > super.onDraw(canvas);
> > p.setColor(Color.GREEN);
> > p.setStrokeWidth(4);
> > canvas.drawLine(prvx, prvy, x, y, p);
> > }
> > }
>
>
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