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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