You're overwriting the previous line each time you touch so the
application can only draw one line.
As far as I know each onDraw() call clears the screen and, therefore,
your previous strokes.
Take a look at the Path class, this provides an easy way of chaining
together multiple points into one long line.
On May 5, 7:43 am, Sukitha Udugamasooriya <suk...@gmail.com> wrote:
> Hi all,
>
> I'm relatively new to Android. 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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