[android-developers] Java based UI & Scrolling of text

[varun maini]

Hi All,

I am trying to create an application with UI totally in Java.

I have a view whose's onDraw function displays a large volume of text.
To add scrolling ability , i have created a new ScrollView and added
the previous view as a child.

The contents are being displayed on the screen , but the scrolling
functionality is not working.

Could anyone please guide me so as to how can i enable vertical n
horizontal scrolling of the text.

Here is the code snippet :-

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.ScrollView;

public class TempScrollView extends Activity {

   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       ParentView parentView = new ParentView(this);
       setContentView(parentView);
   }

   private class ChildView extends View{

       public ChildView(Context c)
       {
               super(c);
               this.setLayoutParams(new LayoutParams
(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT));
       }

       public void onDraw(Canvas c){
               Paint p = new Paint();
               p.setColor(Color.BLUE);
               for(int i=0;i<200;i++){
                       c.drawText("This is a
string",(float)0.0,(float)(i*10.0),p);
               }
       }
   }

   private class ParentView extends ScrollView{
       public ParentView(Context c)
       {
               super(c);
               childView = new ChildView(c);
               this.setLayoutParams(new LayoutParams
(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT));
               this.addView(childView);
               this.setFocusable(true);
               this.setFocusableInTouchMode(true);
       }
       public void onDraw(Canvas c)
       {
               childView.onDraw(c);
       }
       private ChildView childView;
   }
}

Any help would be greatly appreciated...

Thanks And Regards

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