I've been using this basic wrapper around a SeekBar but find it hides the thumb, or does something funky like make it white on a white background, under Marshmallow.
I used the AS "BlankActivity" wizard to create a project to illustrate this, changing nothing except what is described here, from the defaults. On the left is Lollipop, and the same code is running on the right under Marshmallow:
There is a custom horizontal SeekBar to test if there was a general problem customizing them, which there isn't. The first vertical one on the left has no style, which is fine pre-Marshmallow but not otherwise, the central one explicity uses the Widget.Material.Light.SeekBar style to test if the default somehow wasn't being picked up, and the last one gives a big clue because it uses the old Widget.Holo.SeekBar style where it then appears, albeit looking like it came out a few years ago.
Here's the layout for this:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity"
>
<com.otamate.seekbarmarshbug.CustomSeekBar
android:id="@+id/seekBarCustom"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
<com.otamate.seekbarmarshbug.VerticalSeekBar
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_below="@+id/seekBarCustom"
/>
<com.otamate.seekbarmarshbug.VerticalSeekBar
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:layout_below="@+id/seekBarCustom"
android:layout_centerHorizontal="true"
style="@android:style/Widget.Material.Light.SeekBar"
/>
<com.otamate.seekbarmarshbug.VerticalSeekBar
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentRight="true"
android:layout_below="@+id/seekBarCustom"
style="@android:style/Widget.Holo.SeekBar"
/>
</RelativeLayout>
The CustomSeekBar:
package com.otamate.seekbarmarshbug;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.SeekBar;
public class CustomSeekBar extends SeekBar {
public CustomSeekBar(Context context) {
super(context);
}
public CustomSeekBar(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public CustomSeekBar(Context context, AttributeSet attrs) {
super(context, attrs);
}
}
and the VerticalSeekBar:
package com.otamate.seekbarmarshbug;
import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
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 c) {
c.rotate(-90);
c.translate(-getHeight(), 0);
super.onDraw(c);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (!isEnabled()) {
return false;
}
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
setProgress(getMax() - (int) (getMax() * event.getY() / getHeight()));
onSizeChanged(getWidth(), getHeight(), 0, 0);
break;
case MotionEvent.ACTION_CANCEL:
break;
}
return true;
}
}
