Android实现截屏与截长图功能

// 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();
  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();
  }
 }

// 程序入口 截取当前屏幕
 public static void shootLoacleView(Activity a,String picpath) {
  ScreenShot.savePic(ScreenShot.takeScreenShot(a), picpath);
 }

 /**
  * 截取scrollview的屏幕
  * **/
 public static Bitmap getScrollViewBitmap(ScrollView scrollView,String picpath) {
  int h = 0;
  Bitmap bitmap;
  // 获取listView实际高度
  for (int i = 0; i < scrollView.getChildCount(); i++) {
   h += scrollView.getChildAt(i).getHeight();
  }
  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(picpath);
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  }
  try {
   if (null != out) {
    bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
    out.flush();
    out.close();
   }
  } catch (IOException e) {
  }
  return bitmap;
 }

 private static String TAG = "Listview and ScrollView item 截图:";

 /**
  * 截图listview
  * **/
 public static Bitmap getListViewBitmap(ListView listView,String picpath) {
  int h = 0;
  Bitmap bitmap;
  // 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(picpath);
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  }
  try {
   if (null != out) {
    bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
    out.flush();
    out.close();
   }
  } catch (IOException e) {
  }
  return bitmap;
 }

 // 程序入口 截取ScrollView
 public static void shootScrollView(ScrollView scrollView,String picpath) {
  ScreenShot.savePic(getScrollViewBitmap(scrollView, picpath), picpath);
 }

 // 程序入口 截取ListView
 public static void shootListView(ListView listView,String picpath) {
  ScreenShot.savePic(getListViewBitmap(listView,picpath), picpath);
 }