@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
final int childCount = getChildCount();
if (childCount > 0) {
/*当发生偏移时，绘制渐变区域*/
if (mSelectionOffset > 0f && mSelectedPosition < (getChildCount() - 1) && mShowTransitionColor) {
/*获取当前tab和下一tab view */
View selectedTab = getChildAt(mSelectedPosition);
View nextTab = getChildAt(mSelectedPosition + 1);
/*显示tab icon时,刷新各自view 透明度*/
if (mIconVIewId > 0) {
View selectedIconView = selectedTab.findViewById(mIconVIewId);
View nextIconView = nextTab.findViewById(mIconVIewId);
//draw icon alpha
if (selectedIconView instanceof TabIconView && nextIconView instanceof TabIconView) {
((TabIconView) selectedIconView).offsetChanged(mSelectionOffset);
((TabIconView) nextIconView).offsetChanged(1 - mSelectionOffset);
}
}
/*显示tab text,刷新各自view 透明度*/
if (mTextViewId > 0) {
View selectedTextView = selectedTab.findViewById(mTextViewId);
View nextTextView = nextTab.findViewById(mTextViewId);
//draw text color
Integer selectedColor = (Integer) eva luate(mSelectionOffset, mTextSelectedColor, mTextNormalColor);
Integer nextColor = (Integer) eva luate(1 - mSelectionOffset, mTextSelectedColor, mTextNormalColor);
if (selectedTextView instanceof TextView && nextTextView instanceof TextView) {
((TextView) selectedTextView).setTextColor(selectedColor);
((TextView) nextTextView).setTextColor(nextColor);
}
}
}
}
}
private void initViews() {
//得到apdater
TabFragmentAdapter mAdapter = new TabFragmentAdapter(getSupportFragmentManager(), fragments);
ViewPager mPager = (ViewPager) findViewById(R.id.tab_pager);
mPager.setAdapter(mAdapter);
//如果当前类需要对viewPager做监听
TabContainerView mTabLayout = (TabContainerView) findViewById(R.id.ll_tab_container);
mTabLayout.setOnPageChangeListener(this);
mTabLayout.initContainer(getResources().getStringArray(R.array.tab_main_title), ICONS_RES, TAB_COLORS, true);
int width = getResources().getDimensionP