public class ScreenShot {  
      
        // 获取指定Activity的截屏，保存到png文件  
        private static Bitmap takeScreenShot(Activity activity) {  
      
            // View是你需要截图的View  
            View view = activity.getWindow().getDecorView();  
            view.setDrawingCacheEnabled(true);  
            view.buildDrawingCache();  
            Bitmap bitmap = view.getDrawingCache();  
      
            // 获取状态栏高度  
            Rect frame = new Rect();  
            activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);  
            int statusBarHeight = frame.top;  
            System.out.println(statusBarHeight);  
      
            // 获取屏幕长和高  
            int width = activity.getWindowManager().getDefaultDisplay().getWidth();  
            int height = activity.getWindowManager().getDefaultDisplay().getHeight();  
      
            // 去掉标题栏  
            Bitmap b = Bitmap.createBitmap(bitmap, 0, statusBarHeight, width, height - statusBarHeight);  
            view.destroyDrawingCache();  
            return b;  
        }  
      
        // 保存到sdcard  
        private static void savePic(Bitmap b, String strFileName) {  
            FileOutputStream fos = null;  
            try {  
                fos = new FileOutputStream(strFileName);  
                if (null != fos) {  
                    b.compress(Bitmap.CompressFormat.PNG, 90, fos);  
                    fos.flush();  
                    fos.close();  
                }  
            } catch (FileNotFoundException e) {  
                e.printStackTrace();  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
        }  
      
        public static void shoot(Activity activity) {  
            ScreenShot.savePic(ScreenShot.takeScreenShot(activity), "sdcard/apic/image" + System.currentTimeMillis() + ".png");  
        }  
    }  

    ScreenShot.shoot(MainActivity.this);