<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent">
 <ListView
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="#f2f2f2"
  android:divider="#abcdee"
  android:dividerHeight="1px"
  android:id="@+id/listView">
  
 </ListView>
 <!--ToolBar-->
 <android.support.v7.widget.Toolbar
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:background="#4097e6"
  android:id="@+id/toolBar">
  
 </android.support.v7.widget.Toolbar>
 
</RelativeLayout>

package com.research.gong.android_view_research;
import android.animation.ObjectAnimator;
import android.app.Activity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.AbsListView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class MainActivity extends Activity {
 private ListView listView;
 String[] datas = {"A1", "A2", "A3", "A4", "A5", "A6", "A7", "A8", "A9", "A10",
   "A11", "A12", "A13", "A14", "A15", "A16", "A17", "A18", "A19", "A20"};
 private float scaledTouchSlop;
 private float firstY = 0;
 private Toolbar toolbar;
 private ObjectAnimator animtor;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  toolbar = (Toolbar) findViewById(R.id.toolBar);
  listView = (ListView) findViewById(R.id.listView);
  /**
   * 添加一個(gè)HeadView避免第一個(gè)Item被ToolBar遮擋
   * 必須在setAdapter之前進(jìn)行設(shè)置
   */
  initHeadView();
  listView.setAdapter(new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, datas));
  //判斷認(rèn)為是滑動(dòng)的最小距離(乘以系數(shù)調(diào)整滑動(dòng)靈敏度)
  scaledTouchSlop = ViewConfiguration.get(this).getScaledTouchSlop()*3.0f;
  /**
   * 設(shè)置觸摸事件
   */
  listView.setOnTouchListener(new View.OnTouchListener() {
   private float currentY;
   private int direction=-1;
   private boolean mShow = true;
   @Override
   public boolean onTouch(View v, MotionEvent event) {
    switch (event.getAction()) {
     case MotionEvent.ACTION_DOWN:
      firstY = event.getY();
      break;
     case MotionEvent.ACTION_MOVE:
      currentY = event.getY();
      //向下滑動(dòng)
      if (currentY - firstY > scaledTouchSlop) {
       direction = 0;
      }
      //向上滑動(dòng)
      else if (firstY - currentY > scaledTouchSlop) {
       direction = 1;
      }
      //如果是向上滑動(dòng)，并且ToolBar是顯示的，就隱藏ToolBar
      if (direction == 1) {
       if (mShow) {
        toobarAnim(1);
        mShow = !mShow;
       }
      } else if (direction == 0) {
       if (!mShow) {
        toobarAnim(0);
        mShow = !mShow;
       }
      }
      break;
     case MotionEvent.ACTION_UP:
      break;
    }
    return false;//注意此處不能返回true，因?yàn)槿绻祷豻rue,onTouchEvent就無(wú)法執(zhí)行，導(dǎo)致的后果是ListView無(wú)法滑動(dòng)
   }
  });
 }

 /**
  * 設(shè)置頭布局，注意：這個(gè)頭布局的高度要和ToolBar的高度一致
  */
 public void initHeadView() {
  View view = new View(this);
  //abc_action_bar_default_height_material獲取系統(tǒng)ActionBar的高度
  AbsListView.LayoutParams params = new AbsListView.LayoutParams
    (AbsListView.LayoutParams.MATCH_PARENT,
      (int) getResources().getDimension(R.dimen.abc_action_bar_default_height_material));
  view.setLayoutParams(params);
  listView.addHeaderView(view);
 }
 /**
  * ToolBar顯示隱藏動(dòng)畫(huà)
  * @param direction
  */
 public void toobarAnim(int direction) {
  //開(kāi)始新的動(dòng)畫(huà)之前要先取消以前的動(dòng)畫(huà)
  if (animtor != null && animtor.isRunning()) {
   animtor.cancel();
  }
  //toolbar.getTranslationY()獲取的是Toolbar距離自己頂部的距離
  float translationY=toolbar.getTranslationY();
  if (direction == 0) {
   animtor = ObjectAnimator.ofFloat(toolbar, "translationY", translationY, 0);
  } else if (direction == 1) {
   animtor = ObjectAnimator.ofFloat(toolbar, "translationY", translationY, -toolbar.getHeight());
  }
  animtor.start();
 }
}