Android顶部三个TabLayout,滑动到某条目之后就会切换到相应的TabLayout（代码实现）

Android顶部三个TabLayout,滑动到某条目之后就会切换到相应的TabLayout（代码实现）

xml布局：



 

  

  

  
 
 

MainActivity中：

public class MainActivity extends AppCompatActivity implements AbsListView.OnScrollListener {

 private TabLayout tb;
 private ListView lv;
 private ArrayList list;
 private int position;
 private CustomAdapter adapter1;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  list = new ArrayList<>();
  for (int i = 0; i <200; i++) {
list.add("龙雀" + i);
  }
  initView();

 }

 private void initView() {
  tb = (TabLayout) findViewById(R.id.tb);
  lv = (ListView) findViewById(R.id.lv);
  adapter1 = new CustomAdapter(list,this);
  lv.setAdapter(adapter1);
  lv.setOnScrollListener(this);
  for (int i = 0; i < tb.getTabCount(); i++) {
TabLayout.Tab tab = tb.getTabAt(i);
if (tab == null)
 return;

Class c = tab.getClass();
try {

 Field field = c.getDeclaredField("mView");

 field.setAccessible(true);
 final View view = (View) field.get(tab);
 if (view == null)
  return;
 view.setTag(i);
 view.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
position = (int) view.getTag();
switch (position) {

 case 0:
  lv.setSelection(0);
  break;
 case 1:

  lv.setSelection(50);


  break;
 case 2:
  lv.setSelection(70);
  break;
}

  }
 });
} catch (Exception e) {
 e.printStackTrace();
}
  }
 }

 int post;
 @Override
 public void onScrollStateChanged(AbsListView view, int scrollState) {
  switch (scrollState) {
case 0:
 switch (post) {
  case 0:

TabLayout.Tab tab = tb.getTabAt(0);
tab.select();
break;

  case 50:
TabLayout.Tab tab2 = tb.getTabAt(1);
tab2.select();

break;
  case 70:
TabLayout.Tab tab3 = tb.getTabAt(2);
tab3.select();

break;


 }
 Toast.makeText(this, "我现在处于不滑动状态", Toast.LENGTH_SHORT).show();
 break;
case 1:
 Toast.makeText(this, "我现在处于滑动状态", Toast.LENGTH_SHORT).show();
 break;
  }

 }

 @Override
 public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
  switch (firstVisibleItem) {

case 0:
 post = 0;
 break;

case 50:
 post = 50;
 break;
case 70:
 post = 70;
 break;
case 49:
 post = 0;
 break;

case 69:
 post = 50;
 break;

  }
 }
}

适配器：

public class CustomAdapter extends BaseAdapter {
 private ArrayList list = new ArrayList<>();
 private Context context;

 public CustomAdapter(ArrayList list, Context context) {
  this.list = list;
  this.context = context;
 }

 @Override
 public int getCount() {
  return list.size();
 }

 @Override
 public Object getItem(int position) {
  return list.get(position);
 }

 @Override
 public long getItemId(int position) {
  return position;
 }

 @Override
 public View getView(int position, View convertView, ViewGroup parent) {
  ViewHolder viewHolder = null;
  if (convertView == null) {
convertView = LayoutInflater.from(context).inflate(R.layout.item, null);
viewHolder = new ViewHolder(convertView);
convertView.setTag(viewHolder);
  }else {
viewHolder = (ViewHolder)convertView.getTag();
  }
  viewHolder.tv.setText(list.get(position));
  return convertView;
 }

 public static class ViewHolder {
  public View rootView;
  public TextView tv;

  public ViewHolder(View rootView) {
this.rootView = rootView;
this.tv = (TextView) rootView.findViewById(R.id.tv);
  }
 }
}