Detailed explanation of automatic line feed in text drawing with staticlayout in Android
preface
Using canvas's DrawText to draw text will not wrap automatically. Even if a very long string is used, DrawText will only display one line, and the excess part is hidden outside the screen. You can calculate the width of each character one by one, divide the string into multiple parts through a certain algorithm, and then call DrawText to display part by part, but this display efficiency will be very low.
Staticlayout is a tool class in Android for processing text line breaks. Staticlayout has implemented text drawing line breaks. The following is an example of how to use staticlayout:
Sample code
This is the same as the effect of textview. In fact, textview also calls staticlayout to realize line feed.
There are three constructors for staticlayout:
Android staticlayout parameter interpretation
StaticLayout(CharSequence source,
TextPaint paint,
Alignment align,
float spacingmult,
boolean includepad,
TextUtils.TruncateAt ellipsize,int ellipsizedWidth)
1. String that requires a branch
2. Where does the string that needs to be branched start
3. Where does the string that needs a branch end
4. Brush object
5. The width of layout. When the string exceeds the width, it will wrap automatically.
6. Align is used for layout_ CENTER， ALIGN_ NORMAL， ALIGN_ Opposite has three types.
7. Relative line spacing, relative font size, 1.5f indicates that the line spacing is 1.5 times the font height.
8. How much is added to the basic line spacing
The actual line spacing is equal to the sum of the two.
9. Unknown parameter
10. Where do you start to omit
11. More than how much to start omitting
It should be noted that this layout is drawn at the (0,0) point of the canvas by default. If you need to adjust the position, you can only move the starting coordinate of the canvas before the draw
canvas.translate(x,y);
summary
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