Question

我知道我并不是第一个在Android上遇到VerticalSlider问题的人，但即使我记得在第一时间努力让它工作，这是我第一次有一个部分工作的setProgress（）。

所以这就是事情。代表滑块的蓝线已正确更新，但是微小的按钮＆＃34;应该移动的也根本不移动。（见图片）

蓝线根据我发送的值移动，但是＆＃34;按钮＆＃34;不是。它移动了一点，但完全没有跟随蓝线 - 这是正确的。（如果您有更好的条件＆＃34;按钮＆＃34;和蓝线，请随时编辑。可能会有进度线？）

所以这是我对垂直滑块的代码：

import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.SeekBar;

public class VerticalSeekBar extends SeekBar {
    public VerticalSeekBar(Context context) {
        super(context);
    }

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

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

    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(h, w, oldh, oldw);
    }

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

    protected void onDraw(Canvas canvas) {
        canvas.rotate(-90);
        canvas.translate(-getHeight(), 0);
        super.onDraw(canvas);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (!isEnabled())
            return false;

        boolean result = false;

        if (event.getAction() != MotionEvent.ACTION_MOVE) {
            // Prevent duplicate haptic feedback events (due to
            // setProgress() below)
            boolean hf = isHapticFeedbackEnabled();
            setHapticFeedbackEnabled(false); {
                // This is required for OnSeekBarChangeListener.on{Start,Stop}TrackingTouch()
                result = super.onTouchEvent(event);
            } setHapticFeedbackEnabled(hf);
        }

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_MOVE:
                // Vertical scrolling
                setProgress(getMax() - (int)(getMax() * event.getY()/getHeight()));
                onSizeChanged(getWidth(), getHeight(), 0, 0);
                result = true;
                break;
        }

        return result;
    }

    public void customSetProgress(int progress) {
        setProgress(progress);
        onSizeChanged(getWidth(), getHeight(), 0, 0);
    }
}

这就是我如何更新滑块：

    float value = //... Get the value here from other computations
    // We need to use int for the slider
    final int step = 1;
    final int max = (int)MAXPRECISION * 100;
    final int min = (int)MINPRECISION * 100;
    final double initialPosition = (double)max ;
    final int valueInt = (int) (value * 100) ;

    final VerticalSeekBar sliderPrecision = (VerticalSeekBar)findViewById(R.id.verticalSliderPrecision);

    sliderPrecision.setProgress(valueInt);
    sliderPrecision.setMax( (max - min) / step ); //To make sure it is updated as seen in some SO post.

我非常有信心我的VerticalSlider类很好，因为我已经能够在几年前正确使用它了。所以其余的代码肯定有问题，但我无法找到它可能是什么。

至于这里的图像是：

Answer 1

所以我发现通过调用onSizeChanged(getWidth(), getHeight(), 0, 0);

解决了这个问题

所以我创建了一个更新的VerticalSeekBar，它现在运行得很好。我希望它能帮助其他人与他们斗争。

这是更新的课程：

import android.content.Context; import android.graphics.Canvas; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.widget.SeekBar;

public class VerticalSeekBar extends SeekBar {
    public VerticalSeekBar(Context context) {
        super(context);
    }

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

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

    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(h, w, oldh, oldw);
    }

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

    protected void onDraw(Canvas canvas) {
        canvas.rotate(-90);
        canvas.translate(-getHeight(), 0);
        super.onDraw(canvas);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (!isEnabled())
            return false;

        boolean result = false;

        if (event.getAction() != MotionEvent.ACTION_MOVE) {
            // Prevent duplicate haptic feedback events (due to
            // setProgress() below)
            boolean hf = isHapticFeedbackEnabled();
            setHapticFeedbackEnabled(false); {
                // This is required for OnSeekBarChangeListener.on{Start,Stop}TrackingTouch()
                result = super.onTouchEvent(event);
            } setHapticFeedbackEnabled(hf);
        }

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_MOVE:
                // Vertical scrolling
                setProgress(getMax() - (int)(getMax() * event.getY()/getHeight()));
                onSizeChanged(getWidth(), getHeight(), 0, 0);
                result = true;
                break;
        }

        return result;
    }

    public void customSetProgress(int progress) {
        setProgress(progress);
        onSizeChanged(getWidth(), getHeight(), 0, 0);
    }
}

Vertical SeekBar Android，如何用SetProgress（）更新滑块位置

1 个答案: