参考博客：Android从相册中获取图片以及路径

一、截图方法

屏幕截图，屏幕截图只能截取到当前窗体的图形，并不能截取,网上找了一大堆代码，雷同度太多了，根本无法截取到状态栏，

竟然还是有人在避免截取状态栏，只是一种讽刺么？可笑至极。

1.1首先来看你一种截取屏幕

getWindow().getDecorView().setDrawingCacheEnabled(true);
Bitmap screenBitmap = getWindow().getDecorView().getDrawingCache();
img_display.setImageBitmap(screenBitmap);
getWindow().getDecorView().setDrawingCacheEnable(false);//这里必须设置false,否则截图只能调用一次

1.2下面的是每次都可以截取到（只能截取到可见屏幕部分，不可见部分无法截取）

View decorView = getWindow().getDecorView();
Bitmap screenBitmap = Bitmap.createBitmap(decorView.getWidth(), decorView.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(screenBitmap);
decorView.draw(canvas);

1.3截取可见与不可见屏幕部分（除ListView和GridView,只能截取ScrollView和HorizontalScrollView），原因是ListView和GridView的适配机制是不断的remove和add

注意：这里截取的是View而不是屏幕

ScrollView和HorizontalScrollView必须只有一个子布局，也就是说，他的子布局的来作为容器，它来作为滚动控件

ScrollView sv = (ScrollView)findViewById(R.id.scrollbox);
LinearLayout panel= (LinearLayout)sv.findViewById(R.id.scrollbox_panel);
int sumHeight = 0;
for(int i=0;i<panel.getChildCount();i++)
{sumHeight += panel.getChildAt(i).getHeight();
}Bitmap bmp = Bitmap.createBitmap(panel.getWidth(),sumHeight,Config.ARGB_8888);
Canvas canvas = new Canvas(bmp);
decorView.draw(canvas);
//over 至于有人认为，截取到的有些部分是黑色，那是英文你截取到的控件背景很可能是透明的，价格白色试试。

当然View内部提供了为公开的View 截图方法，createSnapshot，我们使用时只需要反射就行

 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) {int width = mRight - mLeft;int height = mBottom - mTop;final AttachInfo attachInfo = mAttachInfo;final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f;width = (int) ((width * scale) + 0.5f);height = (int) ((height * scale) + 0.5f);Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality);if (bitmap == null) {throw new OutOfMemoryError();}Resources resources = getResources();if (resources != null) {bitmap.setDensity(resources.getDisplayMetrics().densityDpi);}Canvas canvas;if (attachInfo != null) {canvas = attachInfo.mCanvas;if (canvas == null) {canvas = new Canvas();}canvas.setBitmap(bitmap);// Temporarily clobber the cached Canvas in case one of our children// is also using a drawing cache. Without this, the children would// steal the canvas by attaching their own bitmap to it and bad, bad// things would happen (invisible views, corrupted drawings, etc.)attachInfo.mCanvas = null;} else {// This case should hopefully never or seldom happencanvas = new Canvas(bitmap);}if ((backgroundColor & 0xff000000) != 0) {bitmap.eraseColor(backgroundColor);}computeScroll();final int restoreCount = canvas.save();canvas.scale(scale, scale);canvas.translate(-mScrollX, -mScrollY);// Temporarily remove the dirty maskint flags = mPrivateFlags;mPrivateFlags &= ~DIRTY_MASK;// Fast path for layouts with no backgroundsif ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) {dispatchDraw(canvas);} else {draw(canvas);}mPrivateFlags = flags;canvas.restoreToCount(restoreCount);canvas.setBitmap(null);if (attachInfo != null) {// Restore the cached Canvas for our siblingsattachInfo.mCanvas = canvas;}return bitmap;}

二、保存图片到相册

顺便提一下，MediaStore保存图片到相册，在手机中，相册和图片的联系是，相册中的图片一定是图片，但手机中的图片不一定是相册中的图片。

也就是说，相册并不保存图片，而是保存图片的路径，在手机中，并不是任何一张图片都能保存在相册中。

图片保存是使用ContentProvider提供的接口，下面是相册的Uri定位

Images.Media.EXTERNAL_CONTENT_URI

2.1最简单的保存方式

String uriString = MediaStore.Images.Media.insertImage(context.getContentResolver(), bmp, "截图-20141121", "这是我的截图");
//返回值是 Uri 协议字符串

2.2最完整的保存方式

ContentResolver contentResolver = context.getContentResolver();
ContentValues values = new ContentValues(4);
values.put(Images.Media.DATE_TAKEN, System.currentTimeMillis());
values.put(Images.Media.MIME_TYPE, "image/png");
values.put(Images.Media.ORIENTATION, 0);
values.put(Images.Media.TITLE, title);
values.put(Images.Media.DESCRIPTION, description);
Uri url = null;try {url = contentResolver.insert(Images.Media.EXTERNAL_CONTENT_URI, values); //其实质是返回 Image.Meida.DATA中图片路径path的转变而成的uriif (bmp != null){OutputStream imageOut = contentResolver.openOutputStream(url);try {bmp.compress(Bitmap.CompressFormat.PNG, 100, imageOut);} finally {imageOut.close();}long id = ContentUris.parseId(url);Images.Thumbnails.getThumbnail(contentResolver, id,Images.Thumbnails.MINI_KIND, null);//获取缩略图} else {Log.e("SAVE", "Failed to create thumbnail, removing original");contentResolver.delete(url, null, null);url = null;}}catch (Exception e) {Log.e("SAVE", "Failed to insert image", e);if (url != null) {contentResolver.delete(url, null, null);url = null;}}

 Images.Thumbnails.getThumbnail(contentResolver, id,Images.Thumbnails.MINI_KIND, null);//获取缩略图

2.3图片的保存的另一种方式（try catch太多，下面是简写方式，但代码绝对正确）

File file = new File("/mnt/sdcard/Pictures/"+imageDate+".png");
FileOutputStream  out = new FileOutputStream(file);
out.flush();
out.close();ContentResolver contentResolver = context.getContentResolver();
ContentValues values = new ContentValues(4);
values.put(Images.Media.DATE_TAKEN, System.currentTimeMillis());
values.put(Images.Media.MIME_TYPE, "image/png");
values.put(Images.Media.ORIENTATION, 0);
values.put(Images.Media.TITLE, title);
values.put(Images.Media.DESCRIPTION, description);
values.put(Images.Media.DATA, file.getAbsolutePath()); //保存图片路径
Uri url = contentResolver.insert(Images.Media.EXTERNAL_CONTENT_URI, values);

try doing it;