自定义垂直拖动的seekbar进度条

时间:2021-07-22 05:03:49

系统自定义的seekbar为横向拖动的样式,需要纵向的时则需要自己定义,网上很多说了重写系统SeekBar中onDraw()的方法,但是我使用的时候不知道为什么拖动条和点偏离了,不在一条直线上自定义垂直拖动的seekbar进度条,好气。。。

然后用了另一篇中改进之后的自定义bar,效果才正常,下面贴出代码

 import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.ViewConfiguration;
import android.view.ViewParent;
import android.widget.SeekBar; public class VerticalSeekBar extends SeekBar {
private boolean mIsDragging;
private float mTouchDownY;
private int mScaledTouchSlop;
private boolean isInScrollingContainer = false; public boolean isInScrollingContainer() {
return isInScrollingContainer;
} public void setInScrollingContainer(boolean isInScrollingContainer) {
this.isInScrollingContainer = isInScrollingContainer;
} /**
* On touch, this offset plus the scaled value from the position of the
* touch will form the progress value. Usually 0.
*/
float mTouchProgressOffset; public VerticalSeekBar(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mScaledTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); } public VerticalSeekBar(Context context, AttributeSet attrs) {
super(context, attrs);
} public VerticalSeekBar(Context context) {
super(context);
} @Override
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());
} @Override
protected synchronized void onDraw(Canvas canvas) {
canvas.rotate(-90);
canvas.translate(-getHeight(), 0);
super.onDraw(canvas);
} @Override
public boolean onTouchEvent(MotionEvent event) {
if (!isEnabled()) {
return false;
} switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (isInScrollingContainer()) {
mTouchDownY = event.getY();
}
else {
setPressed(true); invalidate();
onStartTrackingTouch();
trackTouchEvent(event);
attemptClaimDrag(); onSizeChanged(getWidth(), getHeight(), 0, 0);
}
break; case MotionEvent.ACTION_MOVE:
if (mIsDragging)
{
trackTouchEvent(event); }
else
{
final float y = event.getY();
if (Math.abs(y - mTouchDownY) > mScaledTouchSlop)
{
setPressed(true); invalidate();
onStartTrackingTouch();
trackTouchEvent(event);
attemptClaimDrag(); }
}
onSizeChanged(getWidth(), getHeight(), 0, 0);
break; case MotionEvent.ACTION_UP:
if (mIsDragging)
{
trackTouchEvent(event);
onStopTrackingTouch();
setPressed(false); }
else
{
// Touch up when we never crossed the touch slop threshold
// should
// be interpreted as a tap-seek to that location.
onStartTrackingTouch();
trackTouchEvent(event);
onStopTrackingTouch(); }
onSizeChanged(getWidth(), getHeight(), 0, 0);
// ProgressBar doesn't know to repaint the thumb drawable
// in its inactive state when the touch stops (because the
// value has not apparently changed)
invalidate();
break;
}
return true; } private void trackTouchEvent(MotionEvent event)
{
final int height = getHeight();
final int top = getPaddingTop();
final int bottom = getPaddingBottom();
final int available = height - top - bottom; int y = (int) event.getY(); float scale;
float progress = 0; // 下面是最小值
if (y > height - bottom)
{
scale = 0.0f;
}
else if (y < top)
{
scale = 1.0f;
}
else
{
scale = (float) (available - y + top) / (float) available;
progress = mTouchProgressOffset;
} final int max = getMax();
progress += scale * max; setProgress((int) progress); } /**
* This is called when the user has started touching this widget.
*/
void onStartTrackingTouch()
{
mIsDragging = true;
} /**
* This is called when the user either releases his touch or the touch is
* canceled.
*/
void onStopTrackingTouch()
{
mIsDragging = false;
} private void attemptClaimDrag()
{
ViewParent p = getParent();
if (p != null)
{
p.requestDisallowInterceptTouchEvent(true);
}
} @Override
public synchronized void setProgress(int progress)
{ super.setProgress(progress);
onSizeChanged(getWidth(), getHeight(), 0, 0); }
}

代码取自:http://www.cnblogs.com/mengdd/archive/2013/04/08/3008482.html