. NET programmers quickly learn how Android development-layout and click events are written

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This series of courses is dedicated to veteran programmers who can quickly get started with Android development. System-wide from one. NET Programmer's perspective to summarize Android development in one step.

Previous lesson: All-Stack engineers must: Android mobile phone development, lesson six

Main content:

Layout

Click events

1. Layout

When it comes to the development of the Android front page, you have to say the Android layout. That is, where the control should be placed.

1.1 Relative layout

When we create a new layout file, the default is relative layout. Relative layouts are relative to non-relative layouts. As the name implies, a relative layout is a layout relative to the position of some controls. All controls are positioned relative to each other.

In the relative layout, it can be easily used. Controls that are added by default in relative layouts are stacked by default in the upper-left corner:

Centered relative to the parent control:

Set the position relative to a control:

1.2 Linear layout (this type of layout is generally used)

Linear layouts are arranged horizontally or vertically in linear order. All controls are placed in turn. For example, we can change the default relative layout to a linear layout:

We can set whether the Orientation property is horizontal or vertical.

By default, they are arranged horizontally.

The effect of horizontal arrangement of three columns is achieved by linear layout.

1.3 Table layout

Click events

First: OnClick Property

Front page:

Background processing:

Second way: Anonymous class

The Third Kind: inner class

The fourth kind: When the button is too much, let the activity implement the Onclicklistener interface, through the ID to determine how to operate.

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. NET programmers quickly learn how Android development-layout and click events are written