主要是繼承 AbsSeekBar 然后修改下面這些方法

onProgressRefresh（） //當進度條數據更新的時候，例如我們拖動滑動條的時候，這個方法被調用

setThumbPos（） //這個方法是設置Thumb的位置

onDraw（） //這個是負責畫界面

onSizeChanged（） //更新畫布尺寸

onTouchEvent（） //當觸摸屏幕的時候被調用

trackTouchEvent（） //當拖動滑動條的時候，這個被調用

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還有就是添加一個接口這個接口是SeekBar 的一個內部接口?public interface OnSeekBarChangeListener

里面有三個方法:

public void onProgressChanged(VerticalSeekBar vBar, int progress,boolean fromUser);
public void onStartTrackingTouch(VerticalSeekBar vBar);
public void onStopTrackingTouch(VerticalSeekBar vBar);

這個接口主要是為外部提供監聽。多說無益,大家看源代碼明白一點。

import java.lang.reflect.Field; import java.lang.reflect.Method; import android.content.Context; import android.graphics.Canvas; import android.graphics.Rect; import android.graphics.drawable.Drawable; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.widget.AbsSeekBar; import android.widget.SeekBar; public class VerticalSeekBar extends AbsSeekBar { private int height = -1; private int width = -1; public interface OnSeekBarChangeListener { public void onProgressChanged(VerticalSeekBar vBar, int progress,boolean fromUser); public void onStartTrackingTouch(VerticalSeekBar vBar); public void onStopTrackingTouch(VerticalSeekBar vBar); } private OnSeekBarChangeListener mOnSeekBarChangeListener; public VerticalSeekBar(Context context) { this(context, null); } public VerticalSeekBar(Context context, AttributeSet attrs) { this(context, attrs, android.R.attr.seekBarStyle); } public VerticalSeekBar(Context context, AttributeSet attrs, int defstyle) { super(context, attrs, defstyle); } public void setOnSeekBarChangeListener(OnSeekBarChangeListener l) { mOnSeekBarChangeListener = l; } void onStartTrackingTouch() { if (mOnSeekBarChangeListener != null) { mOnSeekBarChangeListener.onStartTrackingTouch(this); } } void onStopTrackingTouch() { if (mOnSeekBarChangeListener != null) { mOnSeekBarChangeListener.onStopTrackingTouch(this); } } void onProgressRefresh(float scale, boolean fromUser) { Drawable thumb = null; try { Field mThumb_f = this.getClass().getSuperclass().getDeclaredField("mThumb"); mThumb_f.setAccessible(true); thumb = (Drawable)mThumb_f.get(this); } catch (Exception e) { e.printStackTrace(); } setThumbPos(getWidth(), thumb, scale, Integer.MIN_VALUE); invalidate(); if (mOnSeekBarChangeListener != null) { mOnSeekBarChangeListener.onProgressChanged(this, getProgress(), fromUser); } } private void setThumbPos(int w, Drawable thumb, float scale, int gap) { int available = 0; try { int up = getPaddingTop(); int bottom = getPaddingBottom(); available = getHeight() - up - bottom; int thumbWidth = thumb.getIntrinsicWidth(); int thumbHeight = thumb.getIntrinsicHeight(); available -= thumbWidth; //The extra space for the thumb to move on the track available += getThumbOffset() * 2; int thumbPos = (int) (scale * available); int topBound, bottomBound; if (gap == Integer.MIN_VALUE) { Rect oldBounds = thumb.getBounds(); topBound = oldBounds.top; bottomBound = oldBounds.bottom; } else { topBound = gap; bottomBound = gap + thumbHeight; } // Canvas will be translated, so 0,0 is where we start drawing thumb.setBounds(thumbPos, topBound, thumbPos + thumbWidth, bottomBound); } catch (Exception e) { e.printStackTrace(); } } protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { width = 30; height = View.MeasureSpec.getSize(heightMeasureSpec); this.setMeasuredDimension(width, height); } protected void onDraw(Canvas c) { c.rotate(-90); c.translate(-height,0); super.onDraw(c); } protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(h, w, oldw, oldh); } @Override public boolean onTouchEvent(MotionEvent event) { boolean mIsUserSeekable=true; try { Field mIsUserSeekable_f = this.getClass().getSuperclass().getDeclaredField("mIsUserSeekable"); mIsUserSeekable_f.setAccessible(true); mIsUserSeekable = mIsUserSeekable_f.getBoolean(this); } catch (Exception e1) { e1.printStackTrace(); } if (!mIsUserSeekable || !isEnabled()) { return false; } switch (event.getAction()) { case MotionEvent.ACTION_DOWN: setPressed(true); onStartTrackingTouch(); trackTouchEvent(event); break; case MotionEvent.ACTION_MOVE: trackTouchEvent(event); Method attemptClaimDrag; try { attemptClaimDrag = this.getClass().getSuperclass().getDeclaredMethod("attemptClaimDrag"); attemptClaimDrag.setAccessible(true); attemptClaimDrag.invoke(this); } catch (Exception e) { e.printStackTrace(); } break; case MotionEvent.ACTION_UP: trackTouchEvent(event); onStopTrackingTouch(); setPressed(false); // 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; case MotionEvent.ACTION_CANCEL: onStopTrackingTouch(); setPressed(false); invalidate(); // see above explanation break; } return true; } protected void trackTouchEvent(MotionEvent event) { final int height = getHeight(); final int available = height - getPaddingLeft() - getPaddingRight(); int y = (int)(height - event.getY()); float scale; float progress = 0; if (y < getPaddingLeft()) { scale = 0.0f; } else if (y > height - getPaddingRight()) { scale = 1.0f; } else { scale = (float)(y - getPaddingLeft()) / (float)available; float mTouchProgressOffset = 0.0f; try { Field mTouchProgressOffset_f = this.getClass().getSuperclass().getDeclaredField("mTouchProgressOffset"); mTouchProgressOffset_f.setAccessible(true); mTouchProgressOffset = mTouchProgressOffset_f.getFloat(this); } catch(Exception e) { e.printStackTrace(); } progress = mTouchProgressOffset; } final int max = getMax(); progress += scale * max; try { Method setProgress = this.getClass().getSuperclass().getSuperclass().getDeclaredMethod("setProgress", int.class,boolean.class); setProgress.setAccessible(true); setProgress.invoke(this, (int)progress, true); } catch(Exception e) { e.printStackTrace(); } } }

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[轉載鏈接地址]http://blog.csdn.net/failure01/article/details/8577675

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轉載于:https://www.cnblogs.com/yihujiu/p/5760047.html

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