I'm trying to get a vertical seekbar going with the emulator, but I'm sort of stuck. I can get the seekbar to display the way I want it to, and I can get the progress to do what I want, and I can modify the onTouchEvent to get the thumb to go vertically instead of horizontally. What I can't do is get the thumb to move outside of the default 29 horizontal pixels without using setThumbOffset(). This in itself isn't a problem. The problem is coming from the fact that I don't understand the thumbOffset at all -- I guess. I think I could (properly) resize the widget, which I am pretty sure I'm not doing right. Or maybe I could just use the thumbOffset if I could figure it out. Since I can calculate the progress correctly I thought I would just use a linear function of progress * (getTop() - getBottom()) of the widget but that doesn't seem to do it. But I can't figure out what the offset is centered around.
As a somewhat aside, I am really unsure if what I am doing in onSizeChanged() is sane or if it's going to bite me in the ass later on.
Here's the main.xml layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<com.mobilsemantic.mobipoll.SlideBar
android:id="@+id/slide"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:max="100"
android:progress="0"
android:secondaryProgress="25" />
<Button android:id="@+id/button"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="Hello, I am a Button" />
<TextView android:id="@+id/tracking"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
And the class (ignore the debugging junk):
import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.SeekBar;
public class SlideBar extends SeekBar {
private int oHeight = 320, oWidth = 29;
private int oProgress = -1, oOffset = -1;;
private float xPos = -1, yPos = -1;
private int top = -1, bottom = -1, left = -1, right = -1;
public SlideBar(Context context) {
super(context);
}
public SlideBar(Context context, AttributeSet attrs)
{
super(context, attrs);
oOffset = this.getThumbOffset();
oProgress = this.getProgress();
}
public SlideBar(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
}
protected synchronized void onMeasure(int widthMeasureSpec, intheightMeasureSpec)
{
int height = View.MeasureSpec.getSize(heightMeasureSpec);
oHeight = height;
this.setMeasuredDimension(oWidth, oHeight);
}
protected void onSizeChanged(int w, int h, int oldw, int oldh)
{
super.onSizeChanged(h, w, oldw, oldh);
}
protected void onLayout(boolean changed, int l, int t, int r, int b)
{
super.onLayout(changed, l, t, r, b);
left = l;
right = r;
top = t;
bottom = b;
}
protected void onDraw(Canvas c)
{
c.rotate(90);
c.translate(0,-29);
super.onDraw(c);
}
public boolean onTouchEvent(MotionEvent event)
{
xPos = event.getX();
yPos = event.getY();
float progress = (yPos-this.getTop())/(this.getBottom()-this.getTop());
oOffset = this.getThumbOffset();
oProgress = this.getProgress();
Log.d("offset" + System.nanoTime(), new Integer(oOffset).toString());
Log.d("progress" + System.nanoTime(), new Integer(oProgress).toString());
float offset;
offset = progress * (this.getBottom()-this.getTop());
this.setThumbOffset((int)offset);
Log.d("offset_postsetprogress" + System.nanoTime(), new Integer(oOffset).toString());
Log.d("progress_postsetprogress" + System.nanoTime(), new Integer(oProgress).toString());
this.setProgress((int)(100*event.getY()/this.getBottom()));
return true;
}
}
This example demonstrates how do I get a working vertical seekBar in android. Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. Step 2 − Add the following code to res/layout/activity_main. xml.
A SeekBar is an extension of ProgressBar that adds a draggable thumb. The user can touch the thumb and drag left or right to set the current progress level or use the arrow keys.
You are looking for the method getProgress() of the ProgressBar class as SeekBar is a subclass of ProgressBar . So basically it would be something like that. int value = seekBar. getProgress();
Step1: Create a new project. After that, you will have java and XML file. Step2: Open your xml file and add a SeekBar and TextView for message as shown below, max attribute in SeekBar define the maximum it can take. Assign ID to SeekBar And TextView.
I've created a solution which works (at least for me, anyway) and creates a vertical SeekBar. http://hackskrieg.wordpress.com/2012/04/20/working-vertical-seekbar-for-android/
This code will correctly select/deselect the thumb, move correctly, update the listener correctly (only when the progress changes!), update/draw the progress correctly, etc. I hope it helps you.
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);
}
private OnSeekBarChangeListener onChangeListener;
@Override
public void setOnSeekBarChangeListener(OnSeekBarChangeListener onChangeListener){
this.onChangeListener = onChangeListener;
}
private int lastProgress = 0;
@Override
public boolean onTouchEvent(MotionEvent event) {
if (!isEnabled()) {
return false;
}
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
onChangeListener.onStartTrackingTouch(this);
setPressed(true);
setSelected(true);
break;
case MotionEvent.ACTION_MOVE:
// Calling the super seems to help fix drawing problems
super.onTouchEvent(event);
int progress = getMax() - (int) (getMax() * event.getY() / getHeight());
// Ensure progress stays within boundaries of the seekbar
if(progress < 0) {progress = 0;}
if(progress > getMax()) {progress = getMax();}
// Draw progress
setProgress(progress);
// Only enact listener if the progress has actually changed
// Otherwise the listener gets called ~5 times per change
if(progress != lastProgress) {
lastProgress = progress;
onChangeListener.onProgressChanged(this, progress, true);
}
onSizeChanged(getWidth(), getHeight() , 0, 0);
onChangeListener.onProgressChanged(this, getMax() - (int) (getMax() * event.getY() / getHeight()), true);
setPressed(true);
setSelected(true);
break;
case MotionEvent.ACTION_UP:
onChangeListener.onStopTrackingTouch(this);
setPressed(false);
setSelected(false);
break;
case MotionEvent.ACTION_CANCEL:
super.onTouchEvent(event);
setPressed(false);
setSelected(false);
break;
}
return true;
}
public synchronized void setProgressAndThumb(int progress) {
setProgress(getMax() - (getMax()- progress));
onSizeChanged(getWidth(), getHeight() , 0, 0);
}
public synchronized void setMaximum(int maximum) {
setMax(maximum);
}
public synchronized int getMaximum() {
return getMax();
}
}
I just placed this vertical SeekBar inside a LinearLayout with layout_height set to FILL_PARENT and layout_width set to WRAP_CONTENT.
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:orientation="vertical" >
<com.safetyculture.jsadroidtablet.VerticalSeekBar
android:id="@+id/calculatorVerticalSeekBar"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_gravity="bottom"
android:max="4"
android:progress="2" />
</LinearLayout>
NOTE: You must set an OnSeekBarChangeListener, otherwise interacting with the SeekBar will produce NullPointerException.
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