android ScrollView，ListView 截屏并保存到图库

需求截图出如下长图片：

已经写成一个类可直接使用，直接上代码：

/**
 * 项目名称：测试截屏
 * 类描述：截屏
 * 创建人：ZhaoGL
 * 创建时间：2016/4/26 13:47
 */
public class ScreenShot {
    private static String TAG = "ScreenShot";


    /**
     * 获取指定Activity的截屏，保存到png文件
     * @param activity
     * @return
     */
    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
     * @param b
     * @param strFileName
     */
    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(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
        view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
        view.buildDrawingCache();
        Bitmap bitmap = view.getDrawingCache();
        return bitmap;
    }


    public static Bitmap getViewBitmap(View v) {
        v.clearFocus();
        v.setPressed(false);

        boolean willNotCache = v.willNotCacheDrawing();
        v.setWillNotCacheDrawing(false);

        int color = v.getDrawingCacheBackgroundColor();
        v.setDrawingCacheBackgroundColor(0);

        if (color != 0) {
            v.destroyDrawingCache();
        }
        v.buildDrawingCache();
        Bitmap cacheBitmap = v.getDrawingCache();
        if (cacheBitmap == null) {
            return null;
        }

        Bitmap bitmap = Bitmap.createBitmap(cacheBitmap);

        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).setBackgroundColor(
                    Color.parseColor("#ffffff"));
        }
        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);
        return bitmap;
    }

    /**
     * ListView 截屏
     * @param listView
     * @param context
     * @return
     */
    public  static Bitmap createBitmap(ListView listView, Context context){
        int titleHeight,width, height, rootHeight=0;
        Bitmap bitmap;
        Canvas canvas;
        int yPos = 0;
        int listItemNum;
        List childViews = null;

        width = getDisplayMetrics(context)[0];//宽度等于屏幕宽

        ListAdapter listAdapter = listView.getAdapter();
        listItemNum = listAdapter.getCount();
        childViews = new ArrayList(listItemNum);
        View itemView;
        //计算整体高度:
        for(int pos=0; pos < listItemNum; ++pos){
            itemView = listAdapter.getView(pos, null, listView);
            //measure过程
            itemView.measure(View.MeasureSpec.makeMeasureSpec(width, View. MeasureSpec.EXACTLY), View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
            childViews.add(itemView);
            rootHeight += itemView.getMeasuredHeight();
        }

        height = rootHeight;
        // 创建对应大小的bitmap
        bitmap = Bitmap.createBitmap(listView.getWidth(), height,
                Bitmap.Config.ARGB_8888);
        //bitmap = BitmapUtil.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        canvas = new Canvas(bitmap);

        Bitmap itemBitmap;
        int childHeight;
        //把每个ItemView生成图片，并画到背景画布上
        for(int pos=0; pos < childViews.size(); ++pos){
            itemView = childViews.get(pos);
            childHeight = itemView.getMeasuredHeight();
            itemBitmap = viewToBitmap(itemView,width,childHeight);
            if(itemBitmap!=null){
                canvas.drawBitmap(itemBitmap, 0, yPos, null);
            }
            yPos = childHeight +yPos;
        }

        canvas.save(Canvas.ALL_SAVE_FLAG);
        canvas.restore();
        return bitmap;
    }

    private static Bitmap viewToBitmap(View view, int viewWidth, int viewHeight){
        view.layout(0, 0, viewWidth, viewHeight);
        view.buildDrawingCache();
        Bitmap bitmap = view.getDrawingCache();
        return bitmap;
    }

    /**
     * 压缩图片
     * @param image
     * @return
     */
    public static Bitmap compressImage(Bitmap image) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        // 质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中
        image.compress(Bitmap.CompressFormat.JPEG, 100, baos);
        int options = 100;
        // 循环判断如果压缩后图片是否大于100kb,大于继续压缩
        while (baos.toByteArray().length / 1024 > 100) {
            // 重置baos
            baos.reset();
            // 这里压缩options%，把压缩后的数据存放到baos中
            image.compress(Bitmap.CompressFormat.JPEG, options, baos);
            // 每次都减少10
            options -= 10;
        }
        // 把压缩后的数据baos存放到ByteArrayInputStream中
        ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());
        // 把ByteArrayInputStream数据生成图片
        Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);
        return bitmap;
    }

    /**
     * 获取屏幕分辨率
     *
     * @param context
     * @return
     */
    public static final Integer[] getDisplayMetrics(Context context) {
        DisplayMetrics dm = new DisplayMetrics();
        dm = context.getApplicationContext().getResources().getDisplayMetrics();
        int screenWidth = dm.widthPixels;
        int screenHeight = dm.heightPixels;
        return new Integer[]{screenWidth, screenHeight};
    }

    /**
     * 保存图片并插入图库
     * @param context
     * @param bmp
     * @param dir 文件夹
     */
    public static void saveImageToGallery(Context context, Bitmap bmp,String dir) {
        // 首先保存图片
        File appDir = new File(Environment.getExternalStorageDirectory(), dir);
        if (!appDir.exists()) {
            appDir.mkdir();
        }
        String fileName = System.currentTimeMillis() + ".jpg";
        File file = new File(appDir, fileName);
        try {
            FileOutputStream fos = new FileOutputStream(file);
            bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        // 其次把文件插入到系统图库
        try {
            MediaStore.Images.Media.insertImage(context.getContentResolver(),
                    file.getAbsolutePath(), fileName, null);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        // 最后通知图库更新
        String path = appDir + fileName;
        context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + path)));
    }
}

调用方法很简单，下面放上例子：
例子代码下载