How does Android s batch loading work?

The introduction of SVG also needs to start with the digitalization of the first class. In general, there are two scenarios for storing ** as data. That.

First, it is the bitmap (raster map) that we traditionally use. Think of ** as a collection of densely arranged points on a plane. The light emitted by each point has an independent frequency and intensity, which is reflected visually, that is, color and brightness.

Bitmaps have a large family, including common jpeg, jpg, gif, tiff, png, bmp, etc. The second option is vector graphics (SVG is one of them). It looks at the graph from an abstract perspective, recording the patterns displayed in it rather than the raw data at the individual points.

It looks at it as a combination of individual "objects", recording the outline of the object with curves, and describing the pattern inside the object with a certain color pattern (e.g., gradients to describe gradients). For example, a photograph is seen as a combination of various characters and various scenes in the background. This higher perspective is the reflection of human consciousness when we see the world.

Vector formats include CGM, SVG, AI (Adobe Illustrator), CDR (CorelDraw), PDF, SWF, VML, etc.

Of course, multiple adapters can be loaded at the same time, and the adapter is an important link between the data and the UI (view), which is responsible for providing a data bridge for the related components.

However, the following points need to be clarified, taking listview using adapter as an example:

1. If you use multiple adapters, of course, you need to correspond to multiple listviews.

2. The adapter is the bridge of data, and the ListView is equipped with different adapters to display different content.

3. The adapter is just a data adapter, as long as the page needs the adapter, how many adapters are needed to display the data.

I don't understand what you mean by loading multiple adapters, generally similar to listview, a view corresponds to an adapter, if you want this view to load multiple adapters for, if it is a problem with the data source, you can organize the data into an adapter when organizing the data, if it is a list to display a variety of layouts, you can rewrite getviewcount() getViewType.

Here are a few ways to do this:

As the name suggests, merge means merge, merge. It can be used to effectively optimize some of the redundant levels that meet the criteria. There are two main occasions to use merge:

1) In the custom view, the parent element should be framelayout as much as possible, of course, if the parent element is another layout, and it is not too complicated, it can also be used.

2) The overall layout of the activity, the root element needs to be framelayout

viewstub

1) The viewstub can only be inflate once, after which the viewstub object will be left empty. In a nutshell, once a layout specified by a viewstub is injected, it can no longer be controlled by viewstub. So it's not suitable for situations where you need to show hiding on demand.

2) viewstub can only be used to include a layout file, not a specific view, of course, you can also write the view in a layout file. If you want to manipulate a specific view, you should use the visibility property.

3) Merge tags cannot be nested in viewstub. (I think I said it earlier).

But that doesn't hurt a lot, and we can still do a lot of things with viewstub.

include

This label is made purely broken for layout reuse, and there are usually some common parts of the layout in the project, such as self-defined titles, and we don't need to put a **ctrl c, ctrl v everywhere, which seriously violates the design idea of program simplicity and module.

There is a way for webviews to monitor whether a webview has finished loading!

Client is the WebViewClient class! Implement the methods inside, there are start, loading, and finish corresponding to the loading progress of the web page, which can be displayed in the update of the progress bar tonight!