Android TextView如何將文本分爲幾行？

Question

我需要一種將文本分解爲像TextView這樣的行的方法。我看到TextView使用Dynamic -/Static -/BoringLayout來做到這一點。

有了這些信息，我寫了我自己的方法，但文本中斷不一樣。如果字體大小是非常小的線長:-(

public static String ellipsize(final String text, final TextAppearanceSpan textAppearance, final int avail, final int maxLines) { 

    if (TextUtils.isEmpty(text)) { 
     return null; 
    } 

    final StringBuilder builder = new StringBuilder(); 

    final TextPaint paint = new TextPaint(); 
    paint.setTextSize(textAppearance.getTextSize()); 
    paint.setTypeface(Typeface.create(textAppearance.getFamily(), textAppearance.getTextStyle())); 

    final float ellipsisWidth = paint.measureText("\u2026"); 

    final StaticLayout layout = new StaticLayout(text, paint, avail, Layout.Alignment.ALIGN_NORMAL, 1.0f, 0.0f, true); 
    final int lineCount = layout.getLineCount(); 

    final int lines = lineCount < maxLines ? lineCount : maxLines; 

    for (int i = 0; i < lines; i++) { 

     final int lineStart = layout.getLineStart(i); 
     final int lineEnd = layout.getLineEnd(i); 
     String substring = text.substring(lineStart, lineEnd); 

     if ((i == (maxLines - 1)) && (lineCount > maxLines)) { 

     final int nextLineStart = layout.getLineStart(i + 1); 
     final int nextLineEnd = layout.getLineEnd(i + 1); 

     final String nextSubstring = text.substring(nextLineStart, nextLineEnd); 
     final String lastLine = substring.concat(nextSubstring); 

     substring = TextUtils.ellipsize(lastLine, paint, avail - ellipsisWidth, TextUtils.TruncateAt.END, true, null).toString(); 
     } 

     builder.append(substring); 
    } 

    return builder.toString(); 
} 

Answer 1

它看起來，這是不可能創建自己的TextPaint對象，它看起來像TextView的一個。

所以現在我複製從TextView中的TextPaint對象，並改變文字大小和字體。

我認爲現在是工作。

/** 
* Returns the original text if it fits in the specified width (<code>avail</code>) with 
* the properties of the specified TextAppearanceSpan (<code>textAppearance</code>), or, 
* if it does not fit, a truncated copy with ellipsis character added at the end 
* (<code>TextUtils.TruncateAt.END</code>). 
* 
* @param paint 
*   the TextPaint from the TextView 
* @param text 
*   the text to truncated 
* @param textAppearance 
*   text typeface, size, and style 
* @param avail 
*   the available width 
* @param maxLines 
*   maximum number of displayed lines 
* @return the original text or a truncated copy 
* @see TextView#getPaint() 
* @see TextAppearanceSpan 
* @see TextUtils.TruncateAt#END 
*/ 
public static String ellipsize(final TextPaint paint, 
           final String text, 
           final TextAppearanceSpan textAppearance, 
           final int avail, 
           final int maxLines) { 

    if (TextUtils.isEmpty(text)) { 
     return null; 
    } 

    final StringBuilder builder = new StringBuilder(); 

    paint.setTextSize(textAppearance.getTextSize()); 
    paint.setTypeface(Typeface.create(textAppearance.getFamily(), textAppearance.getTextStyle())); 

    final StaticLayout layout = new StaticLayout(text, paint, avail, Layout.Alignment.ALIGN_NORMAL, 1.0f, 0.0f, false); 
    final int lineCount = layout.getLineCount(); 

    final int lines = lineCount < maxLines ? lineCount : maxLines; 

    for (int i = 0; i < lines; i++) { 

     final int lineStart = layout.getLineStart(i); 
     final int lineEnd = layout.getLineEnd(i); 
     String substring = text.substring(lineStart, lineEnd); 

     if ((i == (maxLines - 1)) && (lineCount > maxLines)) { 

     final String lastLine = substring.concat("\u2026"); 
     substring = TextUtils.ellipsize(lastLine, paint, avail, TextUtils.TruncateAt.END, true, null).toString(); 
     } 

     builder.append(substring); 
    } 

    return builder.toString(); 
}