How to Capture Screen shot in android

1)//**********************************************************************************************************************
//This function is store image
    public static void ClickLinear(){
        lytDisplayQuote.setDrawingCacheEnabled(true);
        imgPrivious.setVisibility(ImageView.INVISIBLE);
        imgNext.setVisibility(ImageView.INVISIBLE);
        imgfavs.setVisibility(ImageView.INVISIBLE);
        Bitmap mBitmap=lytDisplayQuote.getDrawingCache();
            if(mBitmap!=null){
                StoreBitmap(mBitmap);
               System.out.println("Saved");
            }
    }
//******************************************************************************************************************************   
    private static void StoreBitmap(Bitmap mBitmap){
        try{
            ByteArrayOutputStream bytes = new ByteArrayOutputStream();
            mBitmap.compress(Bitmap.CompressFormat.PNG, 100, bytes);
           
            //you can create a new file name "test.jpg" in sdcard folder.
            File f = new File(Constant.IMAGEURL);
            f.createNewFile();
            //write the bytes in file
            FileOutputStream fo = new FileOutputStream(f);
            fo.write(bytes.toByteArray());
            fo.close();
           
            lytDisplayQuote.setDrawingCacheEnabled(false);
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        finally{
            imgPrivious.setVisibility(ImageView.VISIBLE);
            imgNext.setVisibility(ImageView.VISIBLE);
            imgfavs.setVisibility(ImageView.VISIBLE);
        }
    }
=================================
  getTabWidget().getChildAt(0).setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    DisplayQuote.ClickLinear();
                    ShareAlertdialog();
                    tabHost.setCurrentTab(0);
                }
            });