private void screenshot()
{
    // 獲取螢幕
View dView = getWindow().getDecorView();
dView.setDrawingCacheEnabled(true);
dView.buildDrawingCache();
Bitmap bmp = dView.getDrawingCache();
if (bmp != null)
    {
        try {
            // 獲取內建SD卡路徑
String sdCardPath = Environment.getExternalStorageDirectory().getPath();
 
// 圖片檔案路徑
String filePath = sdCardPath + File.separator + "screenshot.png";
File file = new File(filePath);
FileOutputStream os = new FileOutputStream(file);
bmp.compress(Bitmap.CompressFormat.PNG, 100, os);
os.flush();
os.close();
} catch (Exception e) {
        }
    }
}