截屏与截长图功能的实现

Demo在GitHub的地址：

https://github.com/Hebin320/ScreenShoot

Demo在CSDN上的下载地址：

http://download.csdn.net/detail/hebin320320/9721970

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在Android开发中，有时候会遇到需要截屏分享到朋友圈或者QQ，截屏有截取当前屏幕，也有需要截取不仅一个屏幕，可能会很长。

截取当前屏幕并保存到内存卡的方法：

// 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);
    }

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当视图超过一个屏幕的时候，可能是listview，也可能是Scrollview，这时候，其实截图就是对listview或者Scrollview进行截图：

 /**
     * 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);
    }

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截长图的效果图：