Android实现标题显示隐藏功能

package com.example.hidetitlebardemo;import android.animation.Animator;import android.animation.ObjectAnimator;import android.app.Activity;import android.os.Bundle;import android.view.MotionEvent;import android.view.View;import android.view.Menu;import android.view.MenuItem;import android.view.ViewConfiguration;import android.view.ViewGroup;import android.view.Window;import android.widget.AbsListView;import android.widget.ListView;import android.widget.RelativeLayout;import android.widget.SimpleAdapter;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;public class MainActivity extends Activity { private ListView mListView; private RelativeLayout mTitle; private int mTouchSlop; private SimpleAdapter mAdapter; private float mFirstY; private float mCurrentY; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); mTouchSlop = ViewConfiguration.get(this).getScaledTouchSlop();  initViews(); showHideTitleBar(true);  } private void initViews() { mListView = (ListView) findViewById(R.id.id_lv); mTitle = (RelativeLayout) findViewById(R.id.id_title); mAdapter = new SimpleAdapter(this, getData(), R.layout.lv_item, new String[]{"info"}, new int[]{R.id.num_info}); mListView.setAdapter(mAdapter); mListView.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mFirstY = event.getY(); break; case MotionEvent.ACTION_MOVE: mCurrentY = event.getY(); if (mCurrentY - mFirstY > mTouchSlop) { System.out.println("mtouchislop:" + mTouchSlop); // 下滑 显示titleBar showHideTitleBar(true); } else if (mFirstY - mCurrentY > mTouchSlop) { // 上滑 隐藏titleBar showHideTitleBar(false); } break; case MotionEvent.ACTION_UP: break; } return false; } }); } private Animator mAnimatorTitle; private Animator mAnimatorContent; private void showHideTitleBar(boolean tag) { if (mAnimatorTitle != null && mAnimatorTitle.isRunning()) { mAnimatorTitle.cancel(); } if (mAnimatorContent != null && mAnimatorContent.isRunning()) { mAnimatorContent.cancel(); } if (tag) { mAnimatorTitle = ObjectAnimator.ofFloat(mTitle, "translationY", mTitle.getTranslationY(), 0); mAnimatorContent = ObjectAnimator.ofFloat(mListView, "translationY", mListView.getTranslationY(), getResources().getDimension(R.dimen.title_height)); } else { mAnimatorTitle = ObjectAnimator.ofFloat(mTitle, "translationY", mTitle.getTranslationY(), -mTitle.getHeight()); mAnimatorContent = ObjectAnimator.ofFloat(mListView, "translationY", mListView.getTranslationY(),0); } mAnimatorTitle.start(); mAnimatorContent.start(); } private List<Map<String, Object>> getData() { List<Map<String, Object>> data = new ArrayList<>(); for (int i = 'A'; i < 'z'; i++) { Map<String, Object> map = new HashMap<>(); map.put("info", (char) i); data.add(map); } return data; }}

<?xml version="1.0" encoding="utf-8"?><RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" xmlns:android="http://schemas.android.com/apk/res/android"> <RelativeLayout android:id="@+id/id_title" android:background="#00ccff" android:layout_width="match_parent" android:layout_height="40dp"> <TextView android:text="Ace " android:layout_centerInParent="true" android:textSize="22sp" android:textColor="#ffffff" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </RelativeLayout> <ListView android:id="@+id/id_lv" android:layout_width="match_parent" android:layout_height="match_parent"/></RelativeLayout>