本文介绍了我怎样才能改变安卓2.3.1 OverScroll颜色？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
由于Android 2.3.1有供ScrollViews和列表称为OverScroll的新功能。随着
Since Android 2.3.1 there is a new feature for ScrollViews and Lists called OverScroll. With
android:overScrollMode="never"
我可以将其关闭，但如果我不wan't将其关闭我怎样才能改变它的颜色？
I can turn it off, but if i don't wan't to turn it off how can I change the Color of it?
推荐答案
AFAIK有没有办法做到这一点。所以，我创建了一个; presenting：
Afaik there is no way to do this. So I created one; presenting:
格雷姆的惊人的自定义列表视图V2
我已经创建了它执行overscroll的列表视图和GridView的（XML的例子是稍微复杂的GridView，但鉴于适用于两者）自定义视图：
I've created a custom view which performs overscroll for ListViews and for GridViews (XML example is for slightly more involved GridView but view works for both):
<CustomGlowListView android:id="@+id/searches"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@android:color/black"
android:layout_margin="10dp"
android:tag="GridView"
android:numColumns="3"
android:horizontalSpacing="8dp"
android:verticalSpacing="8dp">
</CustomGlowListView>
在CustomGlowListView看起来是这样的：
The CustomGlowListView looks like this:
public class CustomGlowListView extends RelativeLayout{
private ImageView underscrollEdge;
private ImageView underscrollGlow;
private ImageView overscrollGlow;
private ImageView overscrollEdge;
private AbsListView listView;
private final static float MAX_EDGE_SIZE = 11f;
private final static float MAX_GLOW_SIZE = 93f;
private float scrollDistanceSinceBoundary = 0;
private Rect paddingRectangle = new Rect();
GestureDetector listViewGestureDetector;
// Gives the option of short circuiting the overscroll glow fade (Such as by scrolling away from the overscrolled edge)
boolean interruptFade = false;
public CustomGlowListView(Context context, AttributeSet attrs)
{
super(context, attrs);
listViewGestureDetector = new GestureDetector(new ListViewGestureDetector());
if( getTag() == null ||
getTag().toString().equalsIgnoreCase("ListView")) { listView = new ListView(context); }
else if(getTag().toString().equalsIgnoreCase("GridView"))
{
listView = new GridView(context, attrs);
((GridView)listView).getSelector().getPadding(paddingRectangle);
}
listView.setId(android.R.id.list);
listView.setOverScrollMode(OVER_SCROLL_NEVER);
addView(listView, new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
underscrollEdge = new ImageView(context);
underscrollEdge.setImageResource(R.drawable.underscroll_edge);
underscrollEdge.setScaleType(ScaleType.FIT_XY);
underscrollGlow = new ImageView(context);
underscrollGlow.setImageResource(R.drawable.underscroll_glow);
underscrollGlow.setScaleType(ScaleType.FIT_XY);
overscrollGlow = new ImageView(context);
overscrollGlow.setImageResource(R.drawable.overscroll_glow);
overscrollGlow.setScaleType(ScaleType.FIT_XY);
overscrollEdge = new ImageView(context);
overscrollEdge.setImageResource(R.drawable.overscroll_edge);
overscrollEdge.setScaleType(ScaleType.FIT_XY);
addView(underscrollGlow, getWideLayout(ALIGN_PARENT_TOP));
addView(underscrollEdge, getWideLayout(ALIGN_PARENT_TOP));
addView(overscrollGlow, getWideLayout(ALIGN_PARENT_BOTTOM));
addView(overscrollEdge, getWideLayout(ALIGN_PARENT_BOTTOM));
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
if(ev.getAction() == MotionEvent.ACTION_DOWN) interruptFade = true;
listViewGestureDetector.onTouchEvent(ev);
if(ev.getAction() == MotionEvent.ACTION_UP) reset();
return super.dispatchTouchEvent(ev);
}
private RelativeLayout.LayoutParams getWideLayout(int alignment)
{
RelativeLayout.LayoutParams returnLayout = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, 0);
returnLayout.addRule(alignment);
return returnLayout;
}
public void reset()
{
interruptFade = false;
new GlowShrinker().execute(scrollDistanceSinceBoundary);
scrollDistanceSinceBoundary = 0;
}
private class ListViewGestureDetector extends SimpleOnGestureListener
{
@Override
public boolean onScroll(MotionEvent downMotionEvent, MotionEvent currentMotionEvent, float distanceX, float distanceY)
{
float distanceTraveled = downMotionEvent.getY() - currentMotionEvent.getY();
if(listIsAtTop() && distanceTraveled < 0) // At top and finger moving down
{
scrollDistanceSinceBoundary -= distanceY;
scaleEdges(underscrollEdge, underscrollGlow, scrollDistanceSinceBoundary);
}
else if(listIsAtTop() && distanceTraveled > 0 && scrollDistanceSinceBoundary > 0) // At top and finger moving up while in overscroll
{
scrollDistanceSinceBoundary -= distanceY;
scaleEdges(underscrollEdge, underscrollGlow, scrollDistanceSinceBoundary);
}
else if(listIsAtBottom() && distanceTraveled > 0) // At bottom and finger moving up
{
scrollDistanceSinceBoundary += distanceY;
scaleEdges(overscrollEdge, overscrollGlow, scrollDistanceSinceBoundary);
}
else if(listIsAtBottom() && distanceTraveled < 0 && scrollDistanceSinceBoundary > 0) // At bottom and finger moving up while in overscroll
{
scrollDistanceSinceBoundary += distanceY;
scaleEdges(overscrollEdge, overscrollGlow, scrollDistanceSinceBoundary);
}
else if(scrollDistanceSinceBoundary != 0) // Neither over scrolling or under scrolling but was at last check. Reset both graphics.
{
reset();
}
Log.v(CustomGlowListView.class.getSimpleName(), "boundaryDistance = " + scrollDistanceSinceBoundary);
return false;
}
private boolean listIsAtTop() { return listView.getChildAt(0).getTop() - paddingRectangle.top == 0; }
private boolean listIsAtBottom(){ return listView.getChildAt(listView.getChildCount()-1).getBottom() + paddingRectangle.bottom == listView.getHeight(); }
}
private class GlowShrinker extends AsyncTask<Float, Integer, Void>
{
ImageView glow;
ImageView edge;
private final int SHRINK_SPEED = 4;
private final int SHRINK_INCREMENT = 50;
@Override
protected void onPreExecute() {
if(underscrollGlow.getHeight() > 0)
{
glow = underscrollGlow;
edge = underscrollEdge;
}
else if (overscrollGlow.getHeight() > 0)
{
glow = overscrollGlow;
edge = overscrollEdge;
}
else
{
return;
}
}
@Override
protected Void doInBackground(Float... scrollDistanceSinceBoundary) {
if(glow != null && edge != null)
{
int currentSize = (int) scrollDistanceSinceBoundary[0].floatValue();
int shrinkRate = (int) currentSize / SHRINK_INCREMENT;
for(int i=0; i < SHRINK_INCREMENT; i++)
{
if(interruptFade)
{
publishProgress(0);
return null;
}
currentSize -= shrinkRate;
publishProgress(currentSize);
try { Thread.sleep(SHRINK_SPEED); } catch (InterruptedException e) { }
}
}
return null;
}
@Override
protected void onPostExecute(Void result) {
if(glow != null && edge != null)
CustomGlowListView.scaleEdges(edge, glow, 0);
}
@Override
protected void onProgressUpdate(Integer... values) {
CustomGlowListView.scaleEdges(edge, glow, values[0]);
}
}
private static void scaleEdges(ImageView scrollEdge, ImageView scrollGlow, float scrollBy)
{
float edgeSize = scrollBy / 20;
float glowSize = scrollBy / 2;
if(edgeSize > MAX_EDGE_SIZE) edgeSize = MAX_EDGE_SIZE;
if(glowSize > MAX_GLOW_SIZE) glowSize = MAX_GLOW_SIZE;
setHeight(scrollEdge, edgeSize);
setHeight(scrollGlow, glowSize);
}
private static void setHeight(ImageView viewIn, float height)
{
ViewGroup.LayoutParams params = viewIn.getLayoutParams();
params.height = (int) height;
viewIn.setLayoutParams(params);
}
public AbsListView getListView()
{
return listView;
}
}
在overscroll图像，你可以抓住从平台\ android的-10 \ DATA \水库\绘制，MDPI \，然后改变色相和放大器;饱和度改变颜色。
The overscroll images you can grab from platforms\android-10\data\res\drawable-mdpi\ and then change Hue & Saturation to change color.
我希望这可以为其他的ListView的定制一个有益的开端 - 有兴趣知道的任何
I hope this can be a useful start for other ListView customisations - Be interesting to hear of any.
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