吐槽下题目,其实并没有什么高端不高端的用法,只是避免跟XXX详解,XXX使用指南之类的题目雷同,但又想不出其它合适的题目,就来了个高(zhuang)端(bi)的名字。
还是说正题吧,这篇尽量不跑题,我先画个圈:自定义TabItem。
需求这东西是很随意的,有时是不会管你标准不标准,规范不规范的。譬如这样:
拿标准的Tablayout就套不进去了,首先它没有tabIndicator,关于如何去除tabIndicator在第一篇中已经讲过,这里不再赘述。其次这两个Tab一个是有icon,一个是没有icon的。当然这个需求本身还是很简单的,假如不用Tablayout也无非就是写个布局,切换viewpager的时候对应的状态改变。但这里我就非要用Tablayout,通过这个例子来说明我们要讲的问题。
对于上面的需求,我们可以自定义TabItem来实现,这个算是比较简单的需求,有时候可能会更复杂,我们都可以通过自定义来达到想要的效果。这是我们需要的layout,一个线性布局,左边是文字,右边是icon。
TabLayout有一个方法叫setCustomView(),通过调用这个方法可以把我们自定义的布局塞进去。那具体的调用就是这样:
mTabLayout.getTabAt(0).setCustomView(getTabView(0));
mTabLayout.getTabAt(1).setCustomView(getTabView(1));
这个getTabView(int i)方法是我们自己写的,用于初始化自定义Item的一些数据,如下:
public View getTabView(final int position) {
final View view = LayoutInflater.from(this).inflate(R.layout.item_tab, null);
TextView txtTitle = (TextView) view.findViewById(R.id.txt_title);
final ImageView imgTitle = (ImageView) view.findViewById(R.id.img_title);
imgTitle.setImageResource(tabIcons[position]);
txtTitle.setText(titles.get(position));
if (position == 0) {
txtTitle.setTextColor(Color.parseColor("#057523"));
} else {
imgTitle.setVisibility(View.INVISIBLE);
txtTitle.setTextColor(Color.parseColor("#ced0d3"));
}
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startPropertyAnim(imgTitle);
mViewPager.setCurrentItem(position);
}
});
return view;
}
没准切换的时候,产品经理让icon还要带点动画效果,所以这里我们随便来了个属性动画,在点击和切换的时候触发:
private void startPropertyAnim(ImageView v) {
ObjectAnimator anim = ObjectAnimator.ofFloat(v, "rotation", 180f, 360f);
anim.setDuration(500);
anim.start();
}
这个切换或者点击时候的事件就要我们自己实现了,所以我们要实现addOnTabSelectedListener
这个接口,并在onTabSelected
和onTabUnselected
里做出相应的改变:
mTabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
changeTabStatus(tab, true);
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
changeTabStatus(tab, false);
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
选中和未选中的时候我们分别调用下changeTabStatus,这个是我们自己写的状态改变的方法:
private void changeTabStatus(TabLayout.Tab tab, boolean selected) {
View view = tab.getCustomView();
final ImageView imgTitle = (ImageView) view.findViewById(R.id.img_title);
TextView txtTitle = (TextView) view.findViewById(R.id.txt_title);
imgTitle.setVisibility(View.VISIBLE);
if (selected) {
txtTitle.setTextColor(Color.parseColor("#0EA73C"));
startPropertyAnim(imgTitle);
} else {
txtTitle.setTextColor(Color.parseColor("#7f7f7f"));
imgTitle.setVisibility(View.INVISIBLE);
}
}
最后给出完整代码:
public class MainActivity extends AppCompatActivity {
ViewPager mViewPager;
ListFragment mFragment1;
ListFragment mFragment2;
PagerAdapter mPagerAdapter;
private TabLayout mTabLayout;
private ArrayList titles = new ArrayList<>();
private boolean isSelected = false;
private int[] tabIcons = {
R.mipmap.icon,
R.mipmap.icon,
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView(savedInstanceState);
}
private void initView(Bundle savedInstanceState) {
mViewPager = (ViewPager) findViewById(R.id.view_pager);
mViewPager.setOffscreenPageLimit(2);
mTabLayout = (TabLayout) findViewById(R.id.toolbar_tab);
if (savedInstanceState == null) {
mFragment1 = new ListFragment();
mFragment1.initData('a', 'z');
mFragment2 = new ListFragment();
mFragment2.initData('A', 'Z');
}
titles.add("我加入的");
titles.add("推荐");
mPagerAdapter = new PagerAdapter(getSupportFragmentManager());
mViewPager.setAdapter(mPagerAdapter);
mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(mTabLayout));
mTabLayout.setupWithViewPager(mViewPager);
mTabLayout.getTabAt(0).setCustomView(getTabView(0));
mTabLayout.getTabAt(1).setCustomView(getTabView(1));
mTabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
changeTabStatus(tab, true);
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
changeTabStatus(tab, false);
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
private void changeTabStatus(TabLayout.Tab tab, boolean selected) {
View view = tab.getCustomView();
final ImageView imgTitle = (ImageView) view.findViewById(R.id.img_title);
TextView txtTitle = (TextView) view.findViewById(R.id.txt_title);
imgTitle.setVisibility(View.VISIBLE);
if (selected) {
txtTitle.setTextColor(Color.parseColor("#0EA73C"));
startPropertyAnim(imgTitle);
} else {
txtTitle.setTextColor(Color.parseColor("#7f7f7f"));
imgTitle.setVisibility(View.INVISIBLE);
}
}
public View getTabView(final int position) {
final View view = LayoutInflater.from(this).inflate(R.layout.item_tab, null);
TextView txtTitle = (TextView) view.findViewById(R.id.txt_title);
final ImageView imgTitle = (ImageView) view.findViewById(R.id.img_title);
imgTitle.setImageResource(tabIcons[position]);
txtTitle.setText(titles.get(position));
if (position == 0) {
txtTitle.setTextColor(Color.parseColor("#057523"));
} else {
imgTitle.setVisibility(View.INVISIBLE);
txtTitle.setTextColor(Color.parseColor("#ced0d3"));
}
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startPropertyAnim(imgTitle);
mViewPager.setCurrentItem(position);
}
});
return view;
}
private void startPropertyAnim(ImageView v) {
ObjectAnimator anim = ObjectAnimator.ofFloat(v, "rotation", 180f, 360f);
anim.setDuration(500);
anim.start();
}
public class PagerAdapter extends FragmentPagerAdapter {
public PagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
if (position == 0) {
return mFragment1;
} else if (position == 1) {
return mFragment2;
}
return null;
}
@Override
public int getCount() {
return 2;
}
}
}
再来看下运行效果
是不是很简单!
有同学说Popupwindow的弹出事件与ViewPager的切换事件冲突了,其实这个稍加调整就可以了,我们定义个变量selectedPosition 用来标识当前被选中的位置,然后比较下当前点击的这个位置如果已经是被选中状态,则弹出Popupwindow,否则就切换ViewPager。
private int selectedPosition = 0;
public View getTabView(final int position) {
final View view = LayoutInflater.from(this).inflate(R.layout.item_tab, null);
TextView txtTitle = (TextView) view.findViewById(R.id.txt_title);
final ImageView imgTitle = (ImageView) view.findViewById(R.id.img_title);
imgTitle.setImageResource(tabIcons[position]);
txtTitle.setText(titles.get(position));
if (position == 0) {
txtTitle.setTextColor(Color.parseColor("#057523"));
} else {
imgTitle.setVisibility(View.INVISIBLE);
txtTitle.setTextColor(Color.parseColor("#ced0d3"));
}
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (selectedPosition == position) {
showPopup();
} else {
mViewPager.setCurrentItem(position);
}
}
});
return view;
}
完整代码:GitHub