android 垂直拖动条seekbar
借鉴了网友的代码,东拼西凑出我想要的效果.
大致思路: 重写Android 的seekbar 中的 draw 方法, 和 重写 setThumb方法 ;
分别为了实现seekbar的垂直效果和bitmap的旋转效果.
package com.example.testseekbar2;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.PixelFormat;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
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) {
//将SeekBar转转90度
c.rotate(-90);
//将旋转后的视图移动回来
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:
int i=0;
//获取滑动的距离
i=getMax() - (int) (getMax() * event.getY() / getHeight());
//设置进度
setProgress(i);
//每次拖动SeekBar都会调用
onSizeChanged(getWidth(), getHeight(), 0, 0);
break;
case MotionEvent.ACTION_CANCEL:
break;
}
return true;
}
@Override
public void setThumb(Drawable thumb) {
thumb = rotateBitmap(thumb);
super.setThumb(thumb);
}
private static Bitmap drawableToBitmap(Drawable drawable)// drawable 转换成bitmap
{
int width = drawable.getIntrinsicWidth(); // 取drawable的长宽
int height = drawable.getIntrinsicHeight();
Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888:Bitmap.Config.RGB_565; // 取drawable的颜色格式
Bitmap bitmap = Bitmap.createBitmap(width, height, config); // 建立对应bitmap
Canvas canvas = new Canvas(bitmap); // 建立对应bitmap的画布
drawable.setBounds(0, 0, width, height);
drawable.draw(canvas); // 把drawable内容画到画布中
return bitmap;
}
private static BitmapDrawable rotateBitmap(Drawable drawable) {
int width = drawable.getIntrinsicWidth();
int height= drawable.getIntrinsicHeight();
Bitmap oldbmp = drawableToBitmap(drawable);// drawable转换成bitmap
Matrix matrix = new Matrix(); // 创建操作图片用的Matrix对象
matrix.setRotate(90,width/2,height/2 ); // 设置旋转
Bitmap newbmp = Bitmap.createBitmap(oldbmp, 0, 0, width, height, matrix, true); // 建立新的bitmap，其内容是对原bitmap的旋转后的图
return new BitmapDrawable(newbmp);
}
}
重写更多的方法, 使得背景ontouch有事件响应:
package com.ami.carwhere.widget;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.PixelFormat;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.ViewConfiguration;
import android.view.ViewParent;
import android.widget.SeekBar;
public class MySeekBar 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 MySeekBar(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mScaledTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
}
public MySeekBar(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MySeekBar(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;
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);
}
@Override
public void setThumb(Drawable thumb) {
thumb = rotateBitmap(thumb);
super.setThumb(thumb);
}
private static Bitmap drawableToBitmap(Drawable drawable)// drawable
// 转换成bitmap
{
int width = drawable.getIntrinsicWidth();
int height = drawable.getIntrinsicHeight();
Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
: Bitmap.Config.RGB_565;
Bitmap bitmap = Bitmap.createBitmap(width, height, config);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, width, height);
drawable.draw(canvas);
return bitmap;
}
private static BitmapDrawable rotateBitmap(Drawable drawable) {
int width = drawable.getIntrinsicWidth();
int height = drawable.getIntrinsicHeight();
Bitmap oldbmp = drawableToBitmap(drawable);
Matrix matrix = new Matrix();
matrix.setRotate(90, width / 2, height / 2);
matrix.postScale(2, 2);
Bitmap newbmp = Bitmap.createBitmap(oldbmp, 0, 0, width, height,
matrix, true);
return new BitmapDrawable(newbmp);
}
}