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 happen
canvas = 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 mask
int flags = mPrivateFlags;
mPrivateFlags &= ~DIRTY_MASK;
// Fast path for layouts with no backgrounds
if ((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 siblings
attachInfo.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uri
if (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;
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