使用ViewPager,PagerSlidingTabStrip,SwipeRefreshLayout打造一款可以点击可以侧滑的顶部导航栏。
先简单介绍一下所用的两个个开源库。
PagerSlidingTabStrip
Github地址
用法:
1.向app Module中的build.gradle中添加依赖
dependencies {
compile 'com.astuetz:pagerslidingtabstrip:1.0.1'
}
2.把PagerSlidingTabStrip这个控件添加到你的布局中,它通常会放在ViewPager的上面
<com.astuetz.PagerSlidingTabStrip
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="48dip" />
3.在你的onCreate()方法中(或者是在Fragment里面的onCreateView()方法中),把PagerSlidingTabStrip跟ViewPager绑定在一起
// Initialize the ViewPager and set an adapter
ViewPager pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(new TestAdapter(getSupportFragmentManager()));
// Bind the tabs to the ViewPager
PagerSlidingTabStrip tabs = (PagerSlidingTabStrip) findViewById(R.id.tabs);
tabs.setViewPager(pager);
4.如果你要设置PagerChange监听的话
// continued from above
tabs.setOnPageChangeListener(mPageChangeListener);
至于它里面的其他很多方法我在这里就不多讲了,需要了解的同学可以去看下Github。
SwipeRefreshLayout
SwipeRefreshLayout是谷歌官方出的一款下拉刷新的控件,只支持下拉刷新,并不支持上拉加载,当然,Github里面也有人基于这个控件写了上拉加载的开源框架,嘻嘻,下一篇给你们介绍。
用法:
1.在xml文件中添加Android.support.v4.widget.SwipeRefreshLayout
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/refresh_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="@+id/lv"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.v4.widget.SwipeRefreshLayout>
2.下拉时若需要出发事件,需实现SwipeRefreshLayout.OnRefreshListener,重写onRefresh()方法。
仿豆瓣实现滑动效果
首先我们先看到MainActivity.class
package com.example.dragonhaw.doubandemo;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.view.Window;
import com.astuetz.PagerSlidingTabStrip;
import com.example.dragonhaw.doubandemo.fragment.PagerFragment;
import com.example.dragonhaw.doubandemo.fragment.RefreshFragment;
public class MainActivity extends AppCompatActivity {
private static final int PAGER_NUM = 4;
private PagerSlidingTabStrip pagerSlidingTabStrip;
private ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//隐藏ActionBar,此方法必须写在setContentView的前面,因为必须在contentView未加载之前将其去掉
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
initView();
}
private void initView() {
pagerSlidingTabStrip = (PagerSlidingTabStrip) findViewById(R.id.pager_tabs);
viewPager = (ViewPager) findViewById(R.id.pager);
//设置ViewPager每次预加载3个pager,也就是除当前pager外另外加载了三个pager,默认为1
viewPager.setOffscreenPageLimit(3);
viewPager.setAdapter(new MyFragmentPagerAdapter(getSupportFragmentManager()));
pagerSlidingTabStrip.setViewPager(viewPager);
}
public class MyFragmentPagerAdapter extends FragmentPagerAdapter {
private String[] Titles = new String[]{
"豆瓣", "发现", "讨论", "我的"
};
public MyFragmentPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public CharSequence getPageTitle(int position) {
return Titles[position];
}
@Override
public Fragment getItem(int position) {
Bundle bundle = new Bundle();
Fragment pagerFragment;
if (position == 0) {
pagerFragment = new RefreshFragment();
} else {
pagerFragment = new PagerFragment();
}
bundle.putInt("pager_num", position);
pagerFragment.setArguments(bundle);
return pagerFragment;
}
@Override
public int getCount() {
return PAGER_NUM;
}
}
}
整个MainActivity应该没什么好说的吧,难理解的地方我都注释了。然后我们写Fragment,在这里我们写两个Fragment,第一个Fragment也就是首页,要实现ListView跟下拉刷新的那个Fragment,RefreshFragment.class代码如下:
package com.example.dragonhaw.doubandemo.fragment;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.Fragment;
import android.support.v4.widget.SwipeRefreshLayout;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import com.example.dragonhaw.doubandemo.R;
import java.util.ArrayList;
import java.util.List;
public class RefreshFragment extends Fragment implements SwipeRefreshLayout.OnRefreshListener{
private SwipeRefreshLayout swipeRefreshLayout;
private ListView listView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view =inflater.inflate(R.layout.fragment_refresh, container, false);
swipeRefreshLayout = (SwipeRefreshLayout) view.findViewById(R.id.refresh_layout);
swipeRefreshLayout.setOnRefreshListener(this);
//为下拉刷新的设置四种颜色
swipeRefreshLayout.setColorSchemeResources(
android.R.color.holo_blue_light,
android.R.color.holo_green_light,
android.R.color.holo_green_light,
android.R.color.holo_orange_light
);
listView = (ListView) view.findViewById(R.id.lv);
listView.setAdapter(new ArrayAdapter<String >(getActivity(), android.R.layout.simple_list_item_1,getData()));
return view;
}
@Override
public void onRefresh() {
swipeRefreshLayout.setRefreshing(true);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
swipeRefreshLayout.setRefreshing(false);
}
}, 3000);
}
public List<String> getData() {
List<String> data = new ArrayList<>();
for (int i = 0; i < 30; i++) {
data.add("数据" + i);
}
return data;
}
}
SwipeRefreshLayout的setColorSchemeResources()方法,是给下拉刷新的那个圆圈设置颜色,最多可以设置四种颜色,这个框架在Android5.0之前是一个横线的颜色变化,很一般,一点都不好看,但是在Android5.0后就变为了一个圆圈的变化,很多APP都用的它,比如说斗鱼tv等。
另外,在onRefresh()方法中,我们设置了三秒钟刷新完成,即setRefreshing()中状态从true变为false。
再接下来我们又建一个Fragment,PagerFragment.class代码如下:
package com.example.dragonhaw.doubandemo.fragment;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.example.dragonhaw.doubandemo.R;
public class PagerFragment extends Fragment {
private TextView textView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_pager, container, false);
textView = (TextView) view.findViewById(R.id.text);
Bundle bundle = getArguments();
int pager = bundle.getInt("pager_num");
textView.setText("" + pager);
return view;
}
}
MainActivity的布局文件:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<com.astuetz.PagerSlidingTabStrip
android:id="@+id/pager_tabs"
android:layout_width="match_parent"
android:layout_height="48dp"
android:background="#ff2d2d2d"
android:textColor="#ff8f8f8f"
android:textSize="18sp"
app:pstsIndicatorColor="#ff00cd79"
app:pstsIndicatorHeight="4dp"
app:pstsShouldExpand="true" />
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
PagerFragment的布局文件如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textSize="50sp"
android:gravity="center"
/>
</LinearLayout>
RefreshFragment的布局文件如下:
<android.support.v4.widget.SwipeRefreshLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/refresh_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<ListView
android:id="@+id/lv"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.v4.widget.SwipeRefreshLayout>
以上所述是小编给大家介绍的Android实现顶部导航栏可点击可滑动效果(仿微信仿豆瓣网),希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对编程网网站的支持!
您可能感兴趣的文章:Android程序开发之Fragment实现底部导航栏实例代码Android实现沉浸式通知栏通知栏背景颜色跟随app导航栏背景颜色而改变Android实现底部导航栏功能(选项卡)Android 沉浸式状态栏与隐藏导航栏实例详解Android仿网易客户端顶部导航栏效果超简单的几行代码搞定Android底部导航栏功能Android仿今日头条顶部导航栏效果的实例代码Android实现简单底部导航栏 Android仿微信滑动切换效果Android项目实战之仿网易顶部导航栏效果Android自定义字母导航栏