public class TextProgressBar extends ProgressBar {

    private Paint mPaint;

    private String text;

    private float rate;

    public TextProgressBar(Context context, AttributeSet attrs) {

        super(context, attrs);

        // TODO Auto-generated constructor stub

        initView();

    }

    public TextProgressBar(Context context) {

        super(context);

        initView();

    }

    private void initView() {

        mPaint = new Paint();

        mPaint.setAntiAlias(true);

        mPaint.setColor(Color.BLUE);

    }

    @Override

    public synchronized void setProgress(int progress) {

        setText(progress);

        super.setProgress(progress);

    }

    private void setText(int progress) {

        rate = progress * 1.0f / this.getMax();

        int i = (int) (rate * 100);

        this.text = String.valueOf(i) + "%";

    }

    @Override

    protected synchronized void onDraw(Canvas canvas) {

        // TODO Auto-generated method stub

        super.onDraw(canvas);

        Rect rect = new Rect();

        mPaint.getTextBounds(text, 0, this.text.length(), rect);

        // int x = (getWidth()/2) - rect.centerX();

        // int y = (getHeight()/2) - rect.centerY();

        int x = (int) (getWidth() * rate);

        if (x == getWidth()) {

            // 如果为百分之百则在左边绘制。

            x = getWidth() - rect.right;

        }

        int y = (getHeight() / 2) - rect.top;

        mPaint.setTextSize(22);

        canvas.drawText(text, x, y, mPaint);

    }

}