beauty.jpeg
如何快速搭建一个优雅的主UI框架？这篇文章主要是关于这个来写的。
我采用的是1个Activity+ 多个Fragment的这种模式，像支付宝底部有4个Tab并且页面是禁止滑动翻页的，而微信底部也是4个Tab但是可以滑动翻页。这篇文章就是用ViewPager+BottomNavigationView+多个Fragment快速搭建一个UI框架,当然啦你也可以使用BottomBar + FrameLayout搭建类似的UI框架。其中主要的思路是来至于Stackoverflow
一、 创建四个Fragment页面设置适配器到ViewPager
private void setupViewPager(ViewPager viewPager) {
List fragmentList = new ArrayList<>();
// add four fragment page to list as the viewpager content
fragmentList.add(NewFragment.newInstance(getString(R.string.title_home)));
fragmentList.add(NewFragment.newInstance(getString(R.string.title_dashboard)));
fragmentList.add(NewFragment.newInstance(getString(R.string.title_notifications)));
fragmentList.add(NewFragment.newInstance(getString(R.string.title_me)));
FragmentPageAdapter adapter = new FragmentPageAdapter(getSupportFragmentManager(), fragmentList);
viewPager.setAdapter(adapter);
}
二、 点击不同的Item监听页面变化事件设置按钮的焦点变化(颜色会自动变化为colorPrimary颜色)
private ViewPager.OnPageChangeListener onPageChangeListener = new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
//if the item is not null , now set it check false
if (mMenuItem != null)
mMenuItem.setChecked(false);
else //set the first bottom view check false
navigation.getMenu().getItem(0).setChecked(false);
// get the current select menu item and then focus it
mMenuItem = navigation.getMenu().getItem(position);
mMenuItem.setChecked(true);
}
@Override
public void onPageScrollStateChanged(int state) {
}
};
三、 点击不同的按钮相应对应的item，随之切换显示相应的Fragment 页面
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_home:
viewPager.setCurrentItem(0);
return true;
case R.id.navigation_dashboard:
viewPager.setCurrentItem(1);
return true;
case R.id.navigation_notifications:
viewPager.setCurrentItem(2);
return true;
case R.id.navigation_me:
viewPager.setCurrentItem(3);
return true;
}
return false;
}
};
四、 创建自定义ViewPager重写onTouchEvent和onInterceptTouchEvent事件并且向外暴露一个是否可滑动页面的isSlidingEnable开关默认开启滑动翻页
public class CustomViewPager extends ViewPager {
// the sliding page switch
private boolean isSlidingEnable = true ;
public CustomViewPager(Context context) {
super(context);
}
public CustomViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
}
//重写此函数
@Override
public boolean onTouchEvent(MotionEvent ev) {
return this.isSlidingEnable && super.onTouchEvent(ev);
}
//重写此函数
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
return this.isSlidingEnable && super.onInterceptTouchEvent(ev);
}
public void setSlidingEnable(boolean slidingEnable) {
isSlidingEnable = slidingEnable;
}
}
当Item大于3时，Item动画变化非常夸张,感受一下
animation.gif
话说Google这样做谁遵循
Material design
五、创建
BottomNavigationViewHelper类禁用掉shiftingMode 模式
public class BottomNavigationViewHelper {
static void removeShifMode(BottomNavigationView view) {
BottomNavigationMenuView menuView = (BottomNavigationMenuView) view.getChildAt(0);
try {
Field shiftingMode = menuView.getClass().getDeclaredField("mShiftingMode");
shiftingMode.setAccessible(true);
shiftingMode.setBoolean(menuView, false);
shiftingMode.setAccessible(false);
for (int i = 0; i < menuView.getChildCount(); ++i) {
BottomNavigationItemView itemView = (BottomNavigationItemView) menuView.getChildAt(i);
itemView.setShiftingMode(false);
//set once again checked value , so view will be updated
itemView.setChecked(itemView.getItemData().isChecked());
}
} catch (NoSuchFieldException e) {
Log.e("ERROR NO SUCH FIELD", "Unable to get shift mode field");
} catch (IllegalAccessException e) {
Log.e("ERROR ILLEGAL ALG", "Unable to change value of shift mode");
}
}
}
六、使用这个使用两个功能：禁止滑动翻页、禁用ShiftingMode动画
//禁用滑动翻页时设置为false,否则为true
viewPager.setSlidingEnable(false);
//移除shiftingMode动画
BottomNavigationViewHelper.removeShifMode(navigation);
//监听按钮选择事件
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
//为Viewpager设置页面
setupViewPager(viewPager);
//监听viewPager变化事件
viewPager.addOnPageChangeListener(onPageChangeListener);
最终效果如下一个是可以滑动翻页、一个是禁用
不禁用.gif
禁止滑动翻页.gif
七、参考链接
1.禁止滑动翻页:https://stackoverflow.com/questions/9650265/how-do-disable-paging-by-swiping-with-finger-in-viewpager-but-still-be-able-to-s [Rajul](https://stackoverflow.com/users/1097358/rajul)的回答更好
2.禁止ShiftingMode动画https://stackoverflow.com/questions/40972293/remove-animation-shifting-mode-from-bottomnavigationview-android
八、完整源码传送门
https://github.com/GitACDreamer/BottomNavigatorFragment
希望大家多多关注star and fork，各位觉得如果有帮助给个赞，谢谢！