Drawable不能按预期工作

我有我的布局的工具栏和PagerSlidingTabStrips，我在同时选择不同的页面或与页面关联的列表滚动时更改两者的drawable。下面的代码：Drawable不能按预期工作

Drawable DRAWABLE[] = new Drawable[8]; 
DRAWABLE[0] = getResources().getDrawable(R.drawable.actionbar_bg); 
DRAWABLE[1] = getResources().getDrawable(R.drawable.actionbar_bg_red); 
DRAWABLE[2] = getResources().getDrawable(R.drawable.actionbar_bg_blue); 
DRAWABLE[3] = getResources().getDrawable(R.drawable.actionbar_bg_orange); 
DRAWABLE[4] = getResources().getDrawable(R.drawable.actionbar_bg_grey); 
DRAWABLE[5] = getResources().getDrawable(R.drawable.actionbar_bg); 
DRAWABLE[6] = getResources().getDrawable(R.drawable.actionbar_bg_red); 
DRAWABLE[7] =getResources().getDrawable(R.drawable.actionbar_bg_blue);

//使用onPageSelected方法：

@Override 
public void onPageSelected(int position) { 
    // TODO Auto-generated method stub 

    mHeaderLogo.setImageResource(IMAGES[position]); 

    mPagerStripView.setBackground(DRAWABLE[position]); 

    mActionBarView.setBackground(DRAWABLE[position]); 

}

// OnScroll方法：

@Override 
public void onScroll(AbsListView view, int firstVisibleItem, 
     int visibleItemCount, int totalItemCount, int pagePosition) { 
    // TODO Auto-generated method stub 

    if (mViewPager.getCurrentItem() == pagePosition) { 

     int scrollY = getScrollY(view); 

     ViewHelper.setTranslationY(mHeader, 
       Math.max(-scrollY, mMinHeaderTranslation)); 
     float ratio = clamp(ViewHelper.getTranslationY(mHeader) 
       /mMinHeaderTranslation, 0.0f, 1.0f); 

     int alpha = (int) (ratio * 255); 

     Drawable currentDrawable = DRAWABLE[pagePosition]; 

     mCurrentDrawable.setAlpha(alpha); 
     mActionBarView.setBackground(mCurrentDrawable); 

     mPagerStripView.setBackground(mCurrentDrawable); 



    } 

}

但Alpha值确实如预期都没有改变。您可以从GIF看到我努力实现

enter image description here

来源

2015-03-25 Pankaj

据我所知的所有资源值是s tored为'int'类型。将'Drawable DRAWABLE []'更改为'int DRAWABLE []' – Apurva 2015-03-25 07:24:28

当列表滚动时，我正在更改drawable的alpha值。 – Pankaj 2015-03-25 07:30:10

替换此

int DRAWABLE[] = new int[8]; 
     DRAWABLE[0] = R.drawable.ic_launcher; 
     DRAWABLE[1] = R.drawable.actionbar_bg_red; 
     DRAWABLE[2] = R.drawable.actionbar_bg_blue; 
     DRAWABLE[3] = R.drawable.actionbar_bg_orange; 
     DRAWABLE[4] = R.drawable.actionbar_bg_grey; 
     DRAWABLE[5] = R.drawable.actionbar_bg; 
     DRAWABLE[6] = R.drawable.actionbar_bg_red; 
     DRAWABLE[7] = R.drawable.actionbar_bg_blue;

替换此

setBackgroundResource(DRAWABLE[position]);

与

setbackground(DRAWABLE[position]);

来源

2015-03-25 07:19:04

Drawable不能按预期工作

回答

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