package com.example.helloverticalseekbar;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, AttributeSet attrs, int defStyle)  {    super(context, attrs, defStyle);  }  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:      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;  }}

package com.example.helloverticalseekbar;import android.os.Bundle;import android.app.Activity;import android.util.Log;import android.view.Menu;import android.widget.SeekBar;import android.widget.TextView;import android.widget.SeekBar.OnSeekBarChangeListener;public class HelloSeekBarActivity extends Activity{  private SeekBar horiSeekBar = null;    private TextView horiText = null;    private VerticalSeekBar verticalSeekBar = null;  private TextView verticalText = null;  @Override  protected void onCreate(Bundle savedInstanceState)  {    Log.d(AppConstants.LOG_TAG, "onCreate");    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_hello_seek_bar);        horiSeekBar = (SeekBar) findViewById(R.id.horiSeekBar);    horiText = (TextView)findViewById(R.id.horiText);        horiSeekBar.setOnSeekBarChangeListener(horiSeekBarListener);        verticalSeekBar = (VerticalSeekBar)findViewById(R.id.verticalSeekBar);    verticalText = (TextView)findViewById(R.id.verticalText);    verticalSeekBar.setOnSeekBarChangeListener(verticalSeekBarChangeListener);            }  @Override  public boolean onCreateOptionsMenu(Menu menu)  {    getMenuInflater().inflate(R.menu.hello_seek_bar, menu);    return true;  }      private OnSeekBarChangeListener horiSeekBarListener = new OnSeekBarChangeListener()  {        @Override    public void onStopTrackingTouch(SeekBar seekBar)    {          }        @Override    public void onStartTrackingTouch(SeekBar seekBar)    {          }        @Override    public void onProgressChanged(SeekBar seekBar, int progress,        boolean fromUser)    {      Log.d(AppConstants.LOG_TAG, "Horizontal SeekBar --> onProgressChanged");      horiText.setText(Integer.toString(progress));          }  };    private OnSeekBarChangeListener verticalSeekBarChangeListener = new OnSeekBarChangeListener()  {        @Override    public void onStopTrackingTouch(SeekBar seekBar)    {          }        @Override    public void onStartTrackingTouch(SeekBar seekBar)    {          }        @Override    public void onProgressChanged(SeekBar seekBar, int progress,        boolean fromUser)    {      Log.d(AppConstants.LOG_TAG, "Vertical SeekBar --> onProgressChanged");      verticalText.setText(Integer.toString(progress));          }  };}

<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:paddingBottom="@dimen/activity_vertical_margin"  android:paddingLeft="@dimen/activity_horizontal_margin"  android:paddingRight="@dimen/activity_horizontal_margin"  android:paddingTop="@dimen/activity_vertical_margin"  tools:context=".HelloSeekBarActivity" >  <TextView    android:id="@+id/myTextView"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_alignParentTop="true"    android:text="@string/hello_world" />  <SeekBar    android:id="@+id/horiSeekBar"    android:layout_width="match_parent"    android:layout_height="20dp"    android:layout_below="@id/myTextView" />  <TextView    android:id="@+id/horiText"    android:layout_width="wrap_content"    android:layout_height="20dp"    android:layout_below="@id/horiSeekBar"    android:text="horizontal" />  <com.example.helloverticalseekbar.VerticalSeekBar    android:id="@+id/verticalSeekBar"    android:layout_width="wrap_content"    android:layout_height="200dp"    android:layout_below="@id/horiText" />  <TextView    android:id="@+id/verticalText"    android:layout_width="wrap_content"    android:layout_height="20dp"    android:layout_below="@id/verticalSeekBar"    android:text="vertical" /></RelativeLayout>

package com.example.helloverticalseekbarv2;import android.content.Context;import android.graphics.Canvas;import android.graphics.Rect;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.view.ViewConfiguration;import android.view.ViewGroup;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);  }}