记录几种截图相关的方法

长图截图

以scrollview为例子，截取scrollview中的所有内容，如果是截取单个view，方式一样，bitmap宽高直接取view的宽高

/**
 * 获取长截图
 * @return
 */
public Bitmap getFullScreenBitmap() {
    int h = 0;
    Bitmap bitmap;
    for (int i = 0; i < scrollVew.getChildCount(); i++) {
        h += scrollVew.getChildAt(i).getHeight();
    }
    // 创建对应大小的bitmap
    bitmap = Bitmap.createBitmap(scrollVew.getWidth(), h,
            Bitmap.Config.ARGB_8888);
    final Canvas canvas = new Canvas(bitmap);
    scrollVew.draw(canvas);
    // 测试输出
    saveBitmapToFile(bitmap);
    return bitmap;
}

## 截图合并 ``` /** * 将两个bitmap合并成一个 */ public static Bitmap newBitmap(Bitmap bit1, Bitmap bit2, int padding) { Bitmap newBit = null; int width = bit1.getWidth(); if (bit2.getWidth() != width) { int h2 = bit2.getHeight() * width / bit2.getWidth(); newBit = Bitmap.createBitmap(width, bit1.getHeight() + h2, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(newBit); Bitmap newSizeBitmap2 = getNewSizeBitmap(bit2, width, h2); canvas.drawBitmap(bit1, 0, 0, null); canvas.drawBitmap(newSizeBitmap2, 0, bit1.getHeight() - padding, null); } else { newBit = Bitmap.createBitmap(width, bit1.getHeight() + bit2.getHeight(), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(newBit); canvas.drawBitmap(bit1, 0, 0, null); canvas.drawBitmap(bit2, 0, bit1.getHeight() - padding, null); } // 测试输出 saveBitmapToFile(newBit); return newBit; }

/** * bitmap缩放 */ public static Bitmap getNewSizeBitmap(Bitmap bitmap, int newWidth, int newHeight) { float scaleWidth = ((float) newWidth) / bitmap.getWidth(); float scaleHeight = ((float) newHeight) / bitmap.getHeight(); // 取得想要缩放的matrix参数 Matrix matrix = new Matrix(); matrix.postScale(scaleWidth, scaleHeight); // 得到新的图片 Bitmap bit1Scale = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); return bit1Scale; } ## 其他一些工具方法 ### 测试图片，保存到指定路径下 private void saveBitmapToFile(Bitmap bitmap) { String fullScreenPath = PhotoUtils.getAppSaveDirPath() + “/” + System.currentTimeMillis() + “.jpg”; FileOutputStream out = null; try { out = new FileOutputStream(fullScreenPath); } catch (FileNotFoundException e) { e.printStackTrace(); } try { if (null != out) { bitmap.compress(Bitmap.CompressFormat.PNG, 100, out); out.flush(); out.close(); } } catch (IOException e) { } }

/** * 获得文件保存目录路径 * * @return */ public static String getAppSaveDirPath() { File file = Environment.getExternalStorageDirectory(); File dir = new File(file, “/sdcard/photo/”); if (!dir.exists()) { dir.mkdirs(); }

return dir.getAbsolutePath(); } ```

bitmap加蒙版

   /**
     * bitmap加蒙版
     * @param src
     * @param color
     * @return
     */
    public static Bitmap createMaskBitmap(Bitmap src, int color) {
        if (src == null) {
            return null;
        }
        int width = src.getWidth();
        int height = src.getHeight();
        //创建一个bitmap
        Bitmap newb = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);// 创建一个新的和SRC长度宽度一样的位图
        //将该图片作为画布
        Canvas canvas = new Canvas(newb);
        Paint p = new Paint();
        p.setColor(color);
        //在画布 0，0坐标上开始绘制原始图片
        canvas.drawBitmap(src, 0, 0, null);
        //在画布上绘制水印图片
        canvas.drawRect(0,0,width,height,p); // 以原始Canvas画出一个矩形
        // 保存
        canvas.save(Canvas.ALL_SAVE_FLAG);
        // 存储
        canvas.restore();
        return newb;
    }

bitmap加水印

/**
 * 加水印
 */
public static Bitmap createWaterMaskBitmap(Bitmap src, Bitmap watermark,int paddingLeft, int paddingTop) {
    if (src == null) {
        return null;
    }
    int width = src.getWidth();
    int height = src.getHeight();
    //创建一个bitmap
    Bitmap newb = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);// 创建一个新的和SRC长度宽度一样的位图
    //将该图片作为画布
    Canvas canvas = new Canvas(newb);
    //在画布 0，0坐标上开始绘制原始图片
    canvas.drawBitmap(src, 0, 0, null);
    //在画布上绘制水印图片
    canvas.drawBitmap(watermark, paddingLeft, paddingTop, null);
    // 保存
    canvas.save(Canvas.ALL_SAVE_FLAG);
    // 存储
    canvas.restore();
    return newb;
}