Android custom ImageView to add layer effect on the picture

First, let's look at the renderings

Realization idea

These are two front and rear comparison pictures. The second picture on the right shows the robbed label pictures when there are no goods. In the center of each picture, the first idea is to set another layer of relativelayout on the outer layer of ImageView

Implementation method

Of course, this is OK. However, if the XML layout itself is very complex, it is not elegant to add a layer to the view tree in this way. Here is another implementation method: custom view

In XML:

Get the centerimage object in the code:

When the invalidate () method in setcenterimgshow () is called, the OnDraw () method of centerimage will be called again and redrawn, so that you can happily add a new layer on the ImageView.

summary

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