how can you Drawing on lyout

package com.myandroid.kidsapp
Activity Name : Drawing.java
Target set :2.1

in this application have two java file and on xml that paint.xml

no need to take any permission into manifest.xml file
//////////////////////////////////////////////////////////////////
1. Drawing .java (main activity )


public class Drawing extends Activity implements OnTouchListener {

SignaturePad paint_llayout;
LinearLayout initpad1 ;
Button Btsave,btreset ,btSave;
ImageButton tvSeeting;
private int pos;

EditText inputFileName;

final String[] items = {
             "Red", "Green",
             "Blue","Black"
      };


String fileName;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.paint);
    initpad1=(LinearLayout)findViewById(R.id.linearLayout2_paint_paint);
        btreset=(Button)findViewById(R.id.btReset_paint);
        btreset.setOnTouchListener(this);
       
        btSave=(Button)findViewById(R.id.btSave_paint);
        btSave.setOnTouchListener(this);
       
        tvSeeting=(ImageButton)findViewById(R.id.img_setting_paint);
        tvSeeting.setOnTouchListener(this);
       

 
        // set canvas ///
       
      setSignatureCanvas();
     
      /////////////////
       
       
       
    }
       
        public boolean onTouch(View v, MotionEvent event)
    {
    switch(event.getAction())
    {
        case  MotionEvent.ACTION_DOWN :
    switch(v.getId())
      {
        case R.id.btReset_paint:
     
    break;
        case R.id.btSave_paint:
         
        break;
           }
                 break;
     case  MotionEvent.ACTION_UP :
          switch(v.getId())
            {
                 case R.id.btReset_paint :
                 paint_llayout.discard();
       
             break;
           
                 case R.id.img_setting_paint :
               
                 // alert Dialog for pic color Name //
               
                 AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setIcon(R.drawable.piccolor_sml);
                 builder.setTitle("Pick a color");
                           
                  builder.setSingleChoiceItems(items, 0, new DialogInterface.OnClickListener()
                        {  
                      public void onClick(DialogInterface dialog, int item)
                      {  
                            pos=item;
                            SignaturePad.mPaint.setColor(0xFF000000);
                            Toast.makeText(getApplicationContext(), items[item], Toast.LENGTH_SHORT).show();
                        }}).setPositiveButton("Ok", new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {

//* set color value as per select * //    

if(items[pos].equalsIgnoreCase("Red"))
{
   
       SignaturePad.mPaint.setColor(0xFFaa0000);
}
     else if(items[pos].equalsIgnoreCase("Green"))
  {
        SignaturePad.mPaint.setColor(0xFF00aa00);
  }
else if(items[pos].equalsIgnoreCase("Blue"))
 {
    SignaturePad.mPaint.setColor(0xFF0000aa);
   }
    else if(items[pos].equalsIgnoreCase("Black"))
      {
SignaturePad.mPaint.setColor(0xFF000000);
}
    else
    {
    SignaturePad.mPaint.setColor(0xFF000000);
    }

}
}).setNegativeButton("Cancel", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
     }
  });
                  builder.show();
             
             break;
     
                 case R.id.btSave_paint:
               
               
                 AlertDialog.Builder alert1 = new AlertDialog.Builder(this);
                 alert1.setTitle(" Save ");
                 alert1.setMessage("Put file name ");
                 alert1.setIcon(R.drawable.save_sml);

                 // Set an EditText view to get user input
               
                 inputFileName= new EditText(this);
               
                 alert1.setView(inputFileName);

                 alert1.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                 public void onClick(DialogInterface dialog, int whichButton) {
                               
                    fileName=inputFileName.getText().toString();
                   
                   if(fileName==null)
                    {
                      paint_llayout.save("default.PNG");
                    Toast.makeText(Drawing.this, "you must provied file name ? ", Toast.LENGTH_LONG).show();
                    }
                    else
                    {
                    paint_llayout.save(fileName+".PNG");
                    Toast.makeText(Drawing.this, " file "+fileName, Toast.LENGTH_LONG).show();
                    }
                 
            }
                 });

                 alert1.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int whichButton) {
                   
                   }
                 });

                 alert1.show();
               
                             
               break;
          }
     break;
     
    }
   
    return false;
   
       
         
   
    }
   
  private void setSignatureCanvas() {
     
    paint_llayout = new SignaturePad(Drawing.this);
initpad1.addView(paint_llayout.getSignaturePad());

}

////////////////////////////////////////////////////////////////
2.SignaturePad.java

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////


public class SignaturePad extends View {

Context _context;
public static Paint   mPaint;
@SuppressWarnings("unused")
private MaskFilter  mEmboss;
@SuppressWarnings("unused")
private MaskFilter  mBlur;
private String filename;

private View v1;
MyView v;
private String storagePath = Environment.getExternalStorageDirectory().toString();

 
public SignaturePad(Context context) {
super(context);
_context = context;
v = new MyView(context);      
v1 = v.getRootView();
       
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        mPaint.setColor(0xFF000000);
             
     
        // mPaint.setColor(0xFFaa0000);
       
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeJoin(Paint.Join.ROUND);
        mPaint.setStrokeCap(Paint.Cap.ROUND);
        mPaint.setStrokeWidth(12);
        mEmboss = new EmbossMaskFilter(new float[] { 1, 1, 1 },
                                       0.4f, 6, 3.5f);
        mBlur = new BlurMaskFilter(8, BlurMaskFilter.Blur.NORMAL);

}



public View getSignaturePad()
{
//filename=filename1;
return v;
}

public void colorChanged(int color) {
        mPaint.setColor(color);
    }
public void discard(){
//mPaint.setARGB(0xff,125,125,125);
//v.mCanvas.drawPaint(mPaint);
v.mBitmap.eraseColor(0xFFAAAAAA);
v.invalidate();
}

    public class MyView extends View {

        @SuppressWarnings("unused")
private static final float MINP = 0.25f;
        @SuppressWarnings("unused")
private static final float MAXP = 0.75f;

        private Bitmap  mBitmap;
        private Canvas  mCanvas;
        private Path    mPath;
        private Paint   mBitmapPaint;

        public MyView(Context c,int col) {
            super(c);

            mPath = new Path();
            mBitmapPaint = new Paint(Paint.DITHER_FLAG);
        }

        public MyView(Context c) {
            super(c);

            mPath = new Path();
            mBitmapPaint = new Paint(Paint.DITHER_FLAG);
        }
        @Override
        protected void onSizeChanged(int w, int h, int oldw, int oldh) {
            super.onSizeChanged(w, h, oldw, oldh);
            if(w > 0 && h > 0){
           mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
           mCanvas = new Canvas(mBitmap);
            }
        }

        @Override
        protected void onDraw(Canvas canvas) {
        // set backround color//
            canvas.drawColor(0xFFAAAAAA);

           
            canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);

            canvas.drawPath(mPath, mPaint);
        }

        private float mX, mY;
        private static final float TOUCH_TOLERANCE = 4;

        private void touch_start(float x, float y) {
            mPath.reset();
            mPath.moveTo(x, y);
            mX = x;
            mY = y;
        }
        private void touch_move(float x, float y) {
            float dx = Math.abs(x - mX);
            float dy = Math.abs(y - mY);
            if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
                mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
                mX = x;
                mY = y;
            }
        }
        private void touch_up() {
            mPath.lineTo(mX, mY);
            // commit the path to our offscreen
            mCanvas.drawPath(mPath, mPaint);
            // kill this so we don't double draw
            mPath.reset();
        }

        @Override
        public boolean onTouchEvent(MotionEvent event) {
            float x = event.getX();
            float y = event.getY();

            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    touch_start(x, y);
                    invalidate();
                    break;
                case MotionEvent.ACTION_MOVE:
                    touch_move(x, y);
                    invalidate();
                    break;
                case MotionEvent.ACTION_UP:
                    touch_up();
                    invalidate();
                    break;
            }
            return true;
        }
    }
   
   
    public void save(String fName){
   
    filename=fName;
   
        System.out.println("Root View : "+v1);
        v1.setDrawingCacheEnabled(true);
        Bitmap bm = v1.getDrawingCache();
        System.out.println("Bitmap : "+bm);
       // String filename = "sign.png";
try {
OutputStream fOut = null;
File file = new File(storagePath, filename);
fOut = new FileOutputStream(file);
if(bm != null)
bm.compress(Bitmap.CompressFormat.PNG, 85, fOut);
fOut.flush();
fOut.close();
MediaStore.Images.Media.insertImage(_context.getContentResolver(), file
.getAbsolutePath(), file.getName(), file.getName());
} catch (FileNotFoundException e) {
Toast.makeText(_context,
"Exception at save: File not found" + e.getMessage(),
Toast.LENGTH_SHORT).show();
} catch (IOException e) {
Toast.makeText(_context,
"Exception at save: IO stream error" + e.getMessage(),
Toast.LENGTH_SHORT).show();
}
//Toast.makeText(_context, "Saved to: " + storagePath + "/" + filename,
//Toast.LENGTH_SHORT).show();
       
   }


}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
And main.xml file is :
in this case it is paint.xml



<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >











    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="fill_parent"
        android:layout_height="79dp"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/btReset_paint"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:layout_weight="0.02"
            android:text="Reset"
            android:visibility="visible" />



         <ImageButton
             android:id="@+id/img_setting_paint"
             android:layout_width="wrap_content"
             android:layout_height="fill_parent"
             android:layout_weight="0.02"
             android:background="#000000"
             android:text="Setting"
             android:visibility="visible" android:src="@drawable/piccolor"/>
       
        <Button
            android:id="@+id/btSave_paint"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:layout_weight="0.03"
            android:text="Save"/>

    </LinearLayout>




    <LinearLayout
        android:id="@+id/linearLayout2_paint_paint"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.08"
        android:background="#ffffff"
        android:orientation="vertical" >

    </LinearLayout>

</LinearLayout>

/////////////////////////////////////////////////////////////////////////////////////////////////////////

now you can run the aaplication .................