代码改变世界

Android开发之TextView排版问题

2013-12-26 16:50  y-z-f  阅读(6414)  评论(0)  编辑  收藏  举报

下面直接是关于解决该问题的代码（根据别人的代码进行了修正以及测试，保证可以修改字体尺寸、颜色、根据padding调整，如果需要支持其他的格式可以将对应的属性添加至Paint类型的对象中）：

 1 public class NsTextView extends TextView {
 2     private String text;
 3     private float textSize;
 4     private float paddingLeft;
 5     private float paddingRight;
 6     private int textColor;
 7     private Paint paint1 = new Paint();
 8     private float textShowWidth;
 9 
10     public NsTextView(Context context, AttributeSet attrs) {
11         super(context, attrs);
12         text = this.getText().toString();
13         textSize = this.getTextSize();
14         textColor = this.getTextColors().getDefaultColor();
15         paddingLeft = this.getPaddingLeft();
16         paddingRight = this.getPaddingRight();
17         paint1.setTextSize(textSize);
18         paint1.setColor(textColor);
19         paint1.setAntiAlias(true);
20     }
21 
22     @Override
23     protected void onDraw(Canvas canvas) {
24         textShowWidth = this.getMeasuredWidth() - paddingLeft - paddingRight;
25         int lineCount = 0;
26         text = this.getText().toString();
27         if (text == null)
28             return;
29         char[] textCharArray = text.toCharArray();
30         float drawedWidth = 0;
31         float charWidth;
32         for (int i = 0; i < textCharArray.length; i++) {
33             charWidth = paint1.measureText(textCharArray, i, 1);
34             if (textCharArray[i] == '\n') {
35                 lineCount++;
36                 drawedWidth = 0;
37                 continue;
38             }
39             if (textShowWidth - drawedWidth < charWidth) {
40                 lineCount++;
41                 drawedWidth = 0;
42             }
43             canvas.drawText(textCharArray, i, 1, paddingLeft + drawedWidth,
44                     (lineCount + 1) * textSize, paint1);
45             drawedWidth += charWidth;
46         }
47         setHeight((int) ((lineCount + 1) * (int) textSize ));
48     }
49 }