Android自定义进度条-带文本(文字进度)的水平进度条(ProgressBar)

/*****
*
* @author lixiaodaoaaa
*         http://weibo.com/lixiaodaoaaa *         http://t.qq.com/lixiaodaoaaa *
*/
public class TextProgressBar extends ProgressBar
{
private String str;
private Paint mPaint;

public TextProgressBar(Context context)
{
super(context);
initText();
}

public TextProgressBar(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
initText();
}

public TextProgressBar(Context context, AttributeSet attrs)
{
super(context, attrs);
initText();
}

@Override
public void setProgress(int progress)
{
setText(progress);
super.setProgress(progress);

}

@Override
protected synchronized void onDraw(Canvas canvas)
{
super.onDraw(canvas);
Rect rect = new Rect();
this.mPaint.getTextBounds(this.str, 0, this.str.length(), rect);
int x = (getWidth() / 2) - rect.centerX();// 让现实的字体处于中心位置;;
int y = (getHeight() / 2) - rect.centerY();// 让显示的字体处于中心位置;;
canvas.drawText(this.str, x, y, this.mPaint);
}

// 初始化，画笔
private void initText()
{
this.mPaint = new Paint();
this.mPaint.setAntiAlias(true);// 设置抗锯齿;;;;
this.mPaint.setColor(Color.WHITE);
}

// 设置文字内容
private void setText(int progress)
{
int i = (int) ((progress * 1.0f / this.getMax()) * 100);
this.str = String.valueOf(i) + "%";
}
}