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我有我的佈局的工具欄和PagerSlidingTabStrips,我在同時選擇不同的頁面或與頁面關聯的列表滾動時更改兩者的drawable。下面的代碼:Drawable不能按預期工作
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值確實如預期都沒有改變。您可以從GIF看到我努力實現
據我所知的所有資源值是s tored爲'int'類型。將'Drawable DRAWABLE []'更改爲'int DRAWABLE []' – Apurva 2015-03-25 07:24:28
當列表滾動時,我正在更改drawable的alpha值。 – Pankaj 2015-03-25 07:30:10