[Android custom control] TextView details and custom

As one of the most common controls of android, it has the following common attributes:

Layout_width, layout_height: required properties for each control

Text: text display, INPUT attribute

TextColor: text color attribute

TextSize: Text Size

There are also some features used in some occasions

AutoLink: sets whether the text is displayed as a URL link, email, phone number, or map. The text is displayed as a clickable link.

AutoText: the spelling of the input value is automatically corrected.

DrawableBottom: Output A drawable under text.

DrawableRight: Output A drawable on the Right of text.

DrawableTop: Output A drawable on the top of the text.

Editable: Set whether to edit

Ellipsize: Set how to display the control when the text is too long

EMS: Set the width to N characters

ShadowRadius: Set the shadow radius.

ShadowColor: Specifies the color of text shadow, which must be used with shadowRadius and must be set with shadowRadius.

 

ShadowDx: Set the start position of the Shadow horizontal coordinate.

ShadowDy: Specifies the start position of the Shadow vertical coordinate.

 

There are many other attributes. These android textviews provide a lot of information. You are familiar with them and have a good grasp of some common attributes. You can check the APIs for other features.

Next, I will focus on it. When we need the TextView function of some features, but the provided api cannot meet the requirements, for example, to make a skewed Textview,

This requires customization.

Steps:

1. Write a MyTextView class to inherit the View and override the onDraw () method of the View.

2. We also need a Paint brush to help us draw TextView;

 

Paint p = new Paint (); p. setColor (Color. BLUE); p. setAntiAlias (true); // remove missing sertices

3. the paint brush is ready and the content is painted. At this time, TextView is displayed normally. to tilt TextView, We can tilt the canvas.

 

 

Canvas c = new Canvas (); c. save (); // save, which appears in pairs with restore. save the canvas status and do not affect c. rotate (45); // set the canvas to rotate 45 degrees c. drawPaint (p); c. restore ();

4. After the custom TextView is completed, we can reference it in Xml.

 

 

You're done. Do you want to go back and try it yourself?