Android开发之TextView排版问题

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 }