andriod浅解之自定义组件ViewPager

ViewPager用于实现多页面的切换效果，该类存在于Google的兼容包里面，所以在引用时记得在BuilldPath中加入“android-support-v4.jar”

主布局文件

main.xml

01 <?xmlversion="1.0"encoding="utf-8"?>
02 <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
03 android:layout_width="fill_parent"
04 android:layout_height="fill_parent"
05 android:orientation="vertical">
06 ​
07 <android.support.v4.view.ViewPager
08 android:id="@+id/viewpager"
09 android:layout_width="wrap_content"
10 android:layout_height="wrap_content"
11 android:layout_gravity="center">
12 ​
13 <android.support.v4.view.PagerTitleStrip
14 android:id="@+id/pagertitle"
15 android:layout_width="wrap_content"
16 android:layout_height="wrap_content"
17 android:layout_gravity="top"/>
18 </android.support.v4.view.ViewPager>
19 ​
20 </LinearLayout>

其中ViewPager为多页显示控件，PagerTitleStrip用于显示当前页面的标题  

 

主窗口代码：

PagerTitleDemoActivity.java

01 packagecom.ns.pager;
02 ​
03 importjava.util.ArrayList;
04 ​
05 importandroid.app.Activity;
06 importandroid.os.Bundle;
07 importandroid.support.v4.view.PagerAdapter;
08 importandroid.support.v4.view.PagerTitleStrip;
09 importandroid.support.v4.view.ViewPager;
10 importandroid.view.LayoutInflater;
11 importandroid.view.View;
12 ​
13 publicclassPagerTitleDemoActivity extendsActivity {
14 /** Called when the activity is first created. */
15 privateViewPager mViewPager;
16 privatePagerTitleStrip mPagerTitleStrip;
17 @Override
18 publicvoidonCreate(Bundle savedInstanceState) {
19 super.onCreate(savedInstanceState);
20 setContentView(R.layout.main);
21 mViewPager = (ViewPager)findViewById(R.id.viewpager);
22 mPagerTitleStrip = (PagerTitleStrip)findViewById(R.id.pagertitle);
23 ​
24 //将要分页显示的View装入数组中
25 LayoutInflater mLi = LayoutInflater.from(this);
26 View view1 = mLi.inflate(R.layout.view1, null);
27 View view2 = mLi.inflate(R.layout.view2, null);
28 View view3 = mLi.inflate(R.layout.view3, null);
29 ​
30 //每个页面的Title数据
31 finalArrayList<View> views = newArrayList<View>();
32 views.add(view1);
33 views.add(view2);
34 views.add(view3);
35 ​
36 finalArrayList<String> titles = newArrayList<String>();
37 titles.add("tab1");
38 titles.add("tab2");
39 titles.add("tab3");
40 ​
41 //填充ViewPager的数据适配器
42 PagerAdapter mPagerAdapter = newPagerAdapter() {
43 ​
44 @Override
45 publicbooleanisViewFromObject(View arg0, Object arg1) {
46 returnarg0 == arg1;
47 }
48 ​
49 @Override
50 publicintgetCount() {
51 returnviews.size();
52 }
53 ​
54 @Override
55 publicvoiddestroyItem(View container, intposition, Object object) {
56 ((ViewPager)container).removeView(views.get(position));
57 }
58 ​
59 @Override
60 publicCharSequence getPageTitle(intposition) {
61 returntitles.get(position);
62 }
63 ​
64 @Override
65 publicObject instantiateItem(View container, intposition) {
66 ((ViewPager)container).addView(views.get(position));
67 returnviews.get(position);
68 }
69 };
70 ​
71 mViewPager.setAdapter(mPagerAdapter);
72 }
73 }