SeekBar Thumb位置问题

时间:2012-12-14 23:14:53

标签: android user-interface seekbar

我正试图为我的Seekbar做一个“贴上标签”的拇指。 目标是每次Seekbar位置更改时自定义拇指上方的文本。

我这样做:

        ...
        seekBar = (SeekBar) findViewById(R.id.bet_seek_bar);
        seekBar.setMax(10);
        setSeekBarLabel("0");
        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

            @Override
            public void onStopTrackingTouch(SeekBar seekBar)
            {

            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar)
            {

            }

            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser)
            {
                setSeekBarLabel(String.valueOf(progress));
            }
        });
    }

    private void setSeekBarLabel(String text)
    {
        BitmapDrawable thumb = Utils.writeOnBitmap(thumbBmp, text, 0, 0, thumbLablePaint);
        seekBar.setThumb(thumb);
    }

跑完之后,触摸吧,我明白了:

screenshot

我现在不关心任何文字问题(不写一个,门廊等)。

我要关注相对于酒吧进度的拇指位置。

拇指位置应该是绿色条结束的位置。我错过了什么?

问候。

2 个答案:

答案 0 :(得分:16)

我最终从SeekBar扩展,并覆盖了onMeasure()和onDraw方法(),这是我发现的唯一方法,所以标签/拇指的工作。

将其发布给其他人:

...
    @Override
    protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
     {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        if (labelBackground != null)
        {

            viewWidth = getMeasuredWidth();
            barHeight = getMeasuredHeight();// returns only the bar height (without the label);
            setMeasuredDimension(viewWidth, barHeight + labelBackground.getHeight());
        }

    }



    @Override
    protected synchronized void onDraw(Canvas canvas)
    {
        if (labelBackground != null)
        {
            barBounds.left = getPaddingLeft();
            barBounds.top = labelBackground.getHeight() + getPaddingTop();
            barBounds.right = barBounds.left + viewWidth - getPaddingRight() - getPaddingLeft();
            barBounds.bottom = barBounds.top + barHeight - getPaddingBottom() - getPaddingTop();

            progressPosX = barBounds.left + ((float) this.getProgress() / (float) this.getMax()) * barBounds.width();

            labelPos.x = (int) progressPosX - labelOffset;
            labelPos.y = getPaddingTop();

            progressDrawable = getProgressDrawable();
            progressDrawable.setBounds(barBounds.left, barBounds.top, barBounds.right, barBounds.bottom);
            progressDrawable.draw(canvas);

            labelTextPaint.getTextBounds(labelText, 0, labelText.length(), labelTextRect);

            canvas.drawBitmap(labelBackground, labelPos.x, labelPos.y, labelBackgroundPaint);
            canvas.drawText(labelText, labelPos.x + labelBackground.getWidth() / 2 - labelTextRect.width() / 2, labelPos.y + labelBackground.getHeight() / 2 + labelTextRect.height() / 2, labelTextPaint);

            thumbX = (int) progressPosX - getThumbOffset();
            thumbDrawable.setBounds(thumbX, barBounds.top, thumbX + thumbDrawable.getIntrinsicWidth(), barBounds.top + thumbDrawable.getIntrinsicHeight());
            thumbDrawable.draw(canvas);
        } else
        {
            super.onDraw(canvas);
        }
    }

结果:

result

答案 1 :(得分:0)

将int progress传递给您将drawable设置为seekBar并使用setProgress()方法的方法:

private void setSeekBarLabel(String text, int progress)
{
    BitmapDrawable thumb = Utils.writeOnBitmap(thumbBmp, text, 0, 0, thumbLablePaint);
    seekBar.setThumb(thumb);
    seekBar.setProgress(progress);
}

并将第二个参数添加到调用方法:

setSeekBarLabel(String.valueOf(progress), progress);
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