Android编程之截屏实现方法(包括scrollview与listview)

本文实例讲述了android编程之截屏实现方法。分享给大家供大家参考，具体如下：

public class screenshot {
 // 获取指定activity的截屏，保存到png文件
 public 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 b1 = 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(b1, 0, 25, 320, 455);
  bitmap b = bitmap.createbitmap(b1, 0, statusbarheight, width, height
    - statusbarheight);
  view.destroydrawingcache();
  savepic(b, "/sdcard/screen_test.png");
  return b;
 }
 // 保存到sdcard
 public 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();
  }
 }
 /**
  * 把view对象转换成bitmap
  * */
 public static bitmap convertviewtobitmap(view view) {
  view.measure(measurespec.makemeasurespec(0, measurespec.unspecified),
    measurespec.makemeasurespec(0, measurespec.unspecified));
  view.layout(0, 0, view.getmeasuredwidth(), view.getmeasuredheight());
  view.builddrawingcache();
  bitmap bitmap = view.getdrawingcache();
  if (bitmap != null) {
   system.out.println("这不是nullde1");
   log.d("nullde1", "nullde1");
  } else {
   system.out.println("这nullnulllnulnlul");
  }
  return bitmap;
 }
 // 程序入口1
 public static void shoot(activity a) {
  screenshot.savepic(screenshot.takescreenshot(a), "/sdcard/screen_test.png");
 }
 // 程序入口2
 public static void shootview(view view) {
  screenshot.savepic(screenshot.convertviewtobitmap(view),
    "sdcard/xx.png");
 }
 public static bitmap getviewbitmap(view v) {
  v.clearfocus();
  v.setpressed(false);
  boolean willnotcache = v.willnotcachedrawing();
  v.setwillnotcachedrawing(false);
  // reset the drawing cache background color to fully transparent
  // for the duration of this operation
  int color = v.getdrawingcachebackgroundcolor();
  v.setdrawingcachebackgroundcolor(0);
  if (color != 0) {
   v.destroydrawingcache();
  }
  v.builddrawingcache();
  bitmap cachebitmap = v.getdrawingcache();
  if (cachebitmap == null) {
   log.e("ttttttttactivity", "failed getviewbitmap(" + v + ")",
     new runtimeexception());
   return null;
  }
  bitmap bitmap = bitmap.createbitmap(cachebitmap);
  // restore the view
  v.destroydrawingcache();
  v.setwillnotcachedrawing(willnotcache);
  v.setdrawingcachebackgroundcolor(color);
  return bitmap;
 }
 /**
  * 截取scrollview的屏幕
  * **/
 public static bitmap getbitmapbyview(scrollview scrollview) {
  int h = 0;
  bitmap bitmap = null;
  // 获取listview实际高度
  for (int i = 0; i < scrollview.getchildcount(); i++) {
   h += scrollview.getchildat(i).getheight();
   scrollview.getchildat(i).setbackgroundresource(r.drawable.bg3);
  }
  log.d(tag, "实际高度:" + h);
  log.d(tag, " 高度:" + scrollview.getheight());
  // 创建对应大小的bitmap
  bitmap = bitmap.createbitmap(scrollview.getwidth(), h,
    bitmap.config.argb_8888);
  final canvas canvas = new canvas(bitmap);
  scrollview.draw(canvas);
  // 测试输出
  fileoutputstream out = null;
  try {
   out = new fileoutputstream("/sdcard/screen_test.png");
  } catch (filenotfoundexception e) {
   e.printstacktrace();
  }
  try {
   if (null != out) {
    bitmap.compress(bitmap.compressformat.png, 100, out);
    out.flush();
    out.close();
   }
  } catch (ioexception e) {
   // todo: handle exception
  }
  return bitmap;
 }
 private static string tag = "listview and scrollview item 截图:";
 /**
  * 截图listview
  * **/
 public static bitmap getbbitmap(listview listview) {
  int h = 0;
  bitmap bitmap = null;
  // 获取listview实际高度
  for (int i = 0; i < listview.getchildcount(); i++) {
   h += listview.getchildat(i).getheight();
  }
  log.d(tag, "实际高度:" + h);
  log.d(tag, "list 高度:" + listview.getheight());
  // 创建对应大小的bitmap
  bitmap = bitmap.createbitmap(listview.getwidth(), h,
    bitmap.config.argb_8888);
  final canvas canvas = new canvas(bitmap);
  listview.draw(canvas);
  // 测试输出
  fileoutputstream out = null;
  try {
   out = new fileoutputstream("/sdcard/screen_test.png");
  } catch (filenotfoundexception e) {
   e.printstacktrace();
  }
  try {
   if (null != out) {
    bitmap.compress(bitmap.compressformat.png, 100, out);
    out.flush();
    out.close();
   }
  } catch (ioexception e) {
   // todo: handle exception
  }
  return bitmap;
 }
}

希望本文所述对大家android程序设计有所帮助。