private void animateOut(final BottomNavigationView bottomNavigationView) {
ViewCompat.animate(bottomNavigationView)
.translationY(bottomNavigationView.getHeight())
.setInterpolator(INTERPOLATOR)
.withLayer()
.setUpdateListener(
new ViewPropertyAnimatorUpdateListener() {
@Override
public void onAnimationUpdate(final View view) {
updateSnackBarMargin(view);
}
})
.setListener(
new ViewPropertyAnimatorListener() {
public void onAnimationStart(View view) {
BottomNavigationBehavior.this.mIsAnimatingOut = true;
}
public void onAnimationCancel(View view) {
BottomNavigationBehavior.this.mIsAnimatingOut = false;
}
public void onAnimationEnd(View view) {
BottomNavigationBehavior.this.mIsAnimatingOut = false;
}
})
.start();
}
private void resetPreMenuItem() {
if (mPrevMenuItem != null) {
mPrevMenuItem.setChecked(false);
} else {
mBottomNavigationView.getMenu().getItem(0).setChecked(false);
}
}
public void changeToFour(View v) {
// activateNewButton(mBottomNavigationView, 3);
resetPreMenuItem();
mPrevMenuItem = mBottomNavigationView.getMenu().getItem(3);
mPrevMenuItem.setChecked(true);
mViewPager.setCurrentItem(3);
}
public static void activateNewButton(BottomNavigationView bottomNavigationView, int position) {
BottomNavigationMenuView bottomNavigationMenuView =
(BottomNavigationMenuView) bottomNavigationView.getChildAt(0);
try {
Method activateNewButtonMethod =
bottomNavigationMenuView.getClass().getDeclaredMethod("activateNewButton", int.class);
activateNewButtonMethod.setAccessible(true);
activateNewButtonMethod.invoke(bottomNavigationMenuView, position);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 取消大于三项时占用其他 item 的空间
*
* @param bottomNavigationView
*/
public static void disableShiftMode(BottomNavigationView bottomNavigationView) {
BottomNavigationMenuView bottomNavigationMenuView =
(BottomNavigationMenuView) bottomNavigationView.getChildAt(0);
try {
Field shiftingModeField =
bottomNavigationMenuView.getClass().getDeclaredField("mShiftingMode");
shiftingModeField.setAccessible(true);
shiftingModeField.setBoolean(bottomNavigationMenuView, false);
shiftingModeField.setAccessible(false);
for (int i = 0; i < bottomNavigationMenuView.getChildCount(); i++) {
BottomNavigationItemView bottomNavigationItemView =
(BottomNavigationItemView) bottomNavigationMenuView.getChildAt(i);
bottomNavigationItemView.setShiftingMode(false);
bottomNavigationItemView.setChecked(bottomNavigationItemView.getItemData().isChecked());
}
} catch (Exception e) {
e.printStackTrace();
}
}
private void initBottomNavigationView() {
mBottomNavigationView.setOnNavigationItemSelectedListener(
item -> {
// 结合 ViewPager 使用时
switch (item.getItemId()) {
case R.id.action_one:
mViewPager.setCurrentItem(0);
break;
case R.id.action_two:
mViewPager.setCurrentItem(1);
break;
case R.id.action_three:
mViewPager.setCurrentItem(2);
break;
case R.id.action_four:
mViewPager.setCurrentItem(3);
break;
}
return true;
});
disableShiftMode(mBottomNavigationView);
}