Android imitation wechat photo selector to preview and view pictures

Well, let's get to the point. Let's take a look at the implementation effect first:

Let's introduce the code:

This idea is:

Take a look at the specific code:

First, start a thread to scan the picture

The code is very detailed, not to mention the pop-up event of folder popwindow

Finally, set the click event of the picture

In order to match the previous blog, I added the operations of selecting and deselecting pictures, deleting and adding pictures in bimp.tempselectbitmap, and updating the number of selected pictures, that is, the following two codes:

Here's a note: I encountered an error when writing and removing pictures. Java concurrentmodificationexception. This error means that when the data source in our vector, list or ArrayList changes, you will encounter this exception error when you operate the list. The solution is to traverse the picture array, Compare whether the paths are the same (the best way is to compare whether the IDs are the same). If an array of new contains the same pictures, finally remove them with the previous picture array removeAll, so that no exception error will be reported. Of course, our new array must be less or equal to our previous array data sources.

The above is the whole content of this article. I hope it will help you learn Android Software Programming.