Android implementation of image verification code method analysis (self drawing control)

The contents of self drawn controls are drawn by themselves. The general process is as follows:

1. Define a class inheritance view

1. Use typedarray to initialize the attribute set. In the view construction method, there is a parameter of attributeset, which is obviously used to save the control attribute information. We can also obtain the information by looping and then using key value pairs. Typedarray is used to simplify our work

2. Override onmeasure measurement control size

3. Override OnDraw drawing control

2. Customize attributes in attrs file according to requirements

Declare styleable declares a custom attribute. You can customize a new attribute or reference an existing attribute. The difference between the two is that a format needs to be added to define the type of the new attribute

3. Use in the activity layout file

Custom picture verification code demonstration effect

Sample code

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