HorizontalScrollView

  1 package com.qf.viewpager02_horizontalscrollview;
  2 
  3 import java.util.ArrayList;
  4 import java.util.List;
  5 import android.app.Activity;
  6 import android.graphics.Color;
  7 import android.os.Bundle;
  8 import android.support.v4.view.PagerAdapter;
  9 import android.support.v4.view.ViewPager;
 10 import android.view.View;
 11 import android.view.ViewGroup;
 12 import android.widget.HorizontalScrollView;
 13 import android.widget.LinearLayout;
 14 import android.widget.LinearLayout.LayoutParams;
 15 import android.widget.TextView;
 16 
 17 public class MainActivity extends Activity {
 18 
 19     private ViewPager vPager;
 20     private List<View> views;
 21     private HorizontalScrollView hScrollView; //水平滚动控件
 22     private LinearLayout navLayout; //标题模块所在的布局控件
 23     private View navIdicate; //指示器控件
 24     private LinearLayout.LayoutParams indicateParams; //指示器控件在线性布局中的参数对象
 25     
 26     @Override
 27     protected void onCreate(Bundle savedInstanceState) {
 28         super.onCreate(savedInstanceState);
 29         setContentView(R.layout.activity_main);
 30         
 31         vPager=(ViewPager) findViewById(R.id.viewPager);
 32         
 33         initViews();
 34         
 35         initNavLayout();
 36         
 37         viewPagerEvent();
 38         
 39         navLayoutEvent();
 40         
 41         selectNav(0);//默认选择第一页
 42     }
 43 
 44     private void navLayoutEvent() {
 45         // TODO 设置导航模块的点击事件
 46         TextView titleTv=null;
 47         for(int i=0;i<navLayout.getChildCount();i++){
 48             titleTv=(TextView) navLayout.getChildAt(i);
 49             titleTv.setTag(i);
 50             
 51             titleTv.setOnClickListener(new View.OnClickListener() {
 52                 
 53                 @Override
 54                 public void onClick(View v) {
 55                     // TODO Auto-generated method stub
 56                     vPager.setCurrentItem((Integer) v.getTag());
 57                 }
 58             });
 59         }
 60         
 61     }
 62 
 63     private void viewPagerEvent() {
 64         // TODO 处理ViewPager相关的事件
 65         vPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
 66             
 67             @Override
 68             public void onPageSelected(int position) {
 69                 // TODO Auto-generated method stub
 70                 selectNav(position);
 71             }
 72             
 73             @Override
 74             public void onPageScrolled(int position, float offset, int offsetPixels) {
 75                 // TODO 当页面滚动时，通过当前的位置和页面滚动的偏移量，计算指示器的左外边距的大小
 76                 int leftMargin=(int) (indicateParams.width*(position+offset));
 77                 indicateParams.leftMargin=leftMargin;
 78                 
 79                 navIdicate.setLayoutParams(indicateParams);//重新设置布局参数对象
 80                 
 81             }
 82             
 83             @Override
 84             public void onPageScrollStateChanged(int state) {
 85                 // TODO Auto-generated method stub
 86             }
 87         });
 88     }
 89 
 90     //选择导航模块的位置，将水平滚动控件滚动到当前模块位置的中心点
 91     private void selectNav(int position){
 92         
 93         TextView modelTv=(TextView) navLayout.getChildAt(position);
 94         
 95         int left=modelTv.getLeft();//获取当前模块控件的左边位置
 96         int offset=left-(getResources().getDisplayMetrics().widthPixels/2)+modelTv.getWidth()/2;
 97         
 98         hScrollView.smoothScrollTo(offset, 0);//水平滚动到指定位置（水平控件可见的左边位置）
 99         
100         for(int i=0;i<navLayout.getChildCount();i++){
101             modelTv=(TextView) navLayout.getChildAt(i);
102             if(i==position)
103                 modelTv.setTextColor(Color.argb(100, 255, 0, 0));
104             else
105                 modelTv.setTextColor(Color.argb(255,  0, 0, 0));
106         }
107         
108         
109     }
110     
111     private void initNavLayout() {
112         // TODO 查找导航中的相关控件
113         hScrollView=(HorizontalScrollView) findViewById(R.id.hScrollViewId);
114         navLayout=(LinearLayout) findViewById(R.id.navLayoutId);
115         navIdicate=findViewById(R.id.navIndicateId);
116         
117         indicateParams=(LayoutParams) navIdicate.getLayoutParams();//获取指示器控件的布局参数对象
118         
119     }
120 
121     private void initViews() {
122         // TODO 加载ViewPager中显示的页面资源
123         views=new ArrayList<View>();
124         views.add(getLayoutInflater().inflate(R.layout.viewpager_view01,null));
125         views.add(getLayoutInflater().inflate(R.layout.viewpager_view02,null));
126         views.add(getLayoutInflater().inflate(R.layout.viewpager_view03,null));
127         views.add(getLayoutInflater().inflate(R.layout.viewpager_view04,null));
128         views.add(getLayoutInflater().inflate(R.layout.viewpager_view05,null));
129         
130         vPager.setAdapter(new MyPagerAdapter()); //设置ViewPager的适配器
131         
132     }
133 
134     //自定义显示页面的适配（用于ViewPager中）
135     class MyPagerAdapter extends PagerAdapter{
136         @Override
137         public int getCount() {
138             return views.size();
139         }
140         @Override
141         public Object instantiateItem(ViewGroup container, int position) {
142             container.addView(views.get(position));
143             
144             return views.get(position);//作为数据对象返回
145         }
146         
147         @Override
148         public void destroyItem(ViewGroup container, int position, Object object) {
149             container.removeView(views.get(position));
150         }
151         
152         @Override
153         public boolean isViewFromObject(View view, Object obj) {
154             return view==obj;
155         }
156     }
157     
158 
159 }

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:paddingBottom="@dimen/activity_vertical_margin"
 6     android:paddingLeft="@dimen/activity_horizontal_margin"
 7     android:paddingRight="@dimen/activity_horizontal_margin"
 8     android:paddingTop="@dimen/activity_vertical_margin"
 9     tools:context=".MainActivity" >
10 
11     <HorizontalScrollView
12         android:id="@+id/hScrollViewId"
13         android:layout_width="match_parent"
14         android:layout_height="50dp"
15         android:layout_marginBottom="2dp" 
16         android:scrollbars="none">
17 
18         <LinearLayout
19             android:layout_width="wrap_content"
20             android:layout_height="match_parent"
21             android:orientation="vertical" >
22 
23             <!-- 标题 -->
24 
25             <LinearLayout
26                 android:id="@+id/navLayoutId"
27                 android:layout_width="wrap_content"
28                 android:layout_height="45dp"
29                 android:orientation="horizontal" >
30 
31                 <TextView
32                     android:id="@+id/mode1Id"
33                     android:layout_width="150dp"
34                     android:layout_height="match_parent"
35                     android:gravity="center"
36                     android:text="第一个页面"
37                     android:textColor="#000"
38                     android:textSize="20sp" />
39 
40                 <TextView
41                     android:id="@+id/modelId2"
42                     android:layout_width="150dp"
43                     android:layout_height="match_parent"
44                     android:gravity="center"
45                     android:text="第2个页面"
46                     android:textColor="#000"
47                     android:textSize="20sp" />
48 
49                 <TextView
50                     android:id="@+id/mode1Id3"
51                     android:layout_width="150dp"
52                     android:layout_height="match_parent"
53                     android:gravity="center"
54                     android:text="第3个页面"
55                     android:textColor="#000"
56                     android:textSize="20sp" />
57 
58                 <TextView
59                     android:id="@+id/mode1Id4"
60                     android:layout_width="150dp"
61                     android:layout_height="match_parent"
62                     android:gravity="center"
63                     android:text="第4个页面"
64                     android:textColor="#000"
65                     android:textSize="20sp" />
66 
67                 <TextView
68                     android:id="@+id/mode1Id5"
69                     android:layout_width="150dp"
70                     android:layout_height="match_parent"
71                     android:gravity="center"
72                     android:text="第5个页面"
73                     android:textColor="#000"
74                     android:textSize="20sp" />
75             </LinearLayout>
76             <!-- 指示器 -->
77             <View
78                 android:id="@+id/navIndicateId"
79                 android:layout_width="150dp"
80                 android:layout_height="4dp"
81                 android:background="#f00"
82                 />
83             <!-- 基准线 -->
84              <View
85                 android:layout_width="match_parent"
86                 android:layout_height="1dp"
87                 android:background="#800"
88                 />
89             
90         </LinearLayout>
91     </HorizontalScrollView>
92 
93     <android.support.v4.view.ViewPager
94         android:id="@+id/viewPager"
95         android:layout_width="match_parent"
96         android:layout_height="match_parent"
97         android:layout_below="@id/hScrollViewId" />
98 
99 </RelativeLayout>