SlidingDrawer动画速度

Question

我刚接触Android编程和堆栈溢出，我需要在我的应用程序中放慢SlidingDrawer的动画速度。

我已经像这样将SlidingDrawer子类化了：

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.SlidingDrawer;

public class WrappingSlidingDrawer extends SlidingDrawer {

public WrappingSlidingDrawer(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);

    int orientation = attrs.getAttributeIntValue("android", "orientation", ORIENTATION_VERTICAL);
    mTopOffset = attrs.getAttributeIntValue("android", "topOffset", 0);
    mVertical = (orientation == SlidingDrawer.ORIENTATION_VERTICAL);
}

public WrappingSlidingDrawer(Context context, AttributeSet attrs) {
    super(context, attrs);

    int orientation = attrs.getAttributeIntValue("android", "orientation", ORIENTATION_VERTICAL);
    mTopOffset = attrs.getAttributeIntValue("android", "topOffset", 0);
    mVertical = (orientation == SlidingDrawer.ORIENTATION_VERTICAL);
}


@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

    int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
    int widthSpecSize =  MeasureSpec.getSize(widthMeasureSpec);

    int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
    int heightSpecSize =  MeasureSpec.getSize(heightMeasureSpec);

    if (widthSpecMode == MeasureSpec.UNSPECIFIED || heightSpecMode == MeasureSpec.UNSPECIFIED) {
        throw new RuntimeException("SlidingDrawer cannot have UNSPECIFIED dimensions");
    }

    final View handle = getHandle();
    final View content = getContent();
    measureChild(handle, widthMeasureSpec, heightMeasureSpec);

    if (mVertical) {
        int height = heightSpecSize - handle.getMeasuredHeight() - mTopOffset;
        content.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(height, heightSpecMode));
        heightSpecSize = handle.getMeasuredHeight() + mTopOffset + content.getMeasuredHeight();
        widthSpecSize = content.getMeasuredWidth();
        if (handle.getMeasuredWidth() > widthSpecSize) widthSpecSize = handle.getMeasuredWidth();
    }
    else {
        int width = widthSpecSize - handle.getMeasuredWidth() - mTopOffset;
        getContent().measure(MeasureSpec.makeMeasureSpec(width, widthSpecMode), heightMeasureSpec);
        widthSpecSize = handle.getMeasuredWidth() + mTopOffset + content.getMeasuredWidth();
        heightSpecSize = content.getMeasuredHeight();
        if (handle.getMeasuredHeight() > heightSpecSize) heightSpecSize = handle.getMeasuredHeight();
    }

    setMeasuredDimension(widthSpecSize, heightSpecSize);
}

private boolean mVertical;
private int mTopOffset;

}

我找到了这个链接：How to change animation velocity on SlidingDrawer，它说我可以找到一个替代的实现，或者复制源代码并修改它。

我在自己的项目中创建了SlidingDrawer.java，并粘贴了here中的代码，但存在错误。有几行引用了R.styleable.SlidingDrawer，例如

TypedArray a = context.obtainStyledAttributes(attrs,
            R.styleable.SlidingDrawer, defStyle, 0);

这是Eclipse无法解决的问题。

还有四个成员变量(mTop、mBottom、mLeft、mRight)是Eclipse不能解析的。

如何让Eclipse找到这些资源/变量？然后我将能够编辑一些变量来产生一个较慢的动画，对吗？

Answer 1

我相信R.styleable已经从sdk中删除了，不过你可以自己写，这样的东西应该可以工作。

在values文件夹中创建一个xml文件

<?xml version="1.0" encoding="UTF-8"?>
<resources>
<declare-styleable name="MySlider"> 
        <attr name = "SlidingDrawer_orientation"  format="integer"/>
        <attr name = "SlidingDrawer_bottomOffset" format = "dimension"/>
        <attr name = "SlidingDrawer_topOffset" format = "dimension"/>
        <attr name = "SlidingDrawer_allowSingleTap" format = "boolean"/>
        <attr name = "SlidingDrawer_animateOnClick" format = "boolean"/>
        <attr name = "SlidingDrawer_handle" format = "reference"/>
        <attr name = "SlidingDrawer_content" format = "reference"/>
    </declare-styleable>
</resources>

然后，在slider类中可以引用xml文件

TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.MySlider, defStyle, 0);

int orientation = a.getInt(R.styleable.MySlider_SlidingDrawer_orientation, ORIENTATION_VERTICAL);
//...etc. ...

我还扩展了slidingdrawer类，这对我很有效。