OSC首发:android中的左右滑屏实现By ViewPager
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先看效果,就是左右滑屏的效果
具体实现详解
android compatibility package, revision 3在7月份发布后,其中有个ViewPager引起了我的注意
官方的描述:
请参考:http://developer.android.com/sdk/compatibility-library.html#Notes
ViewPager的下载与安装
首先通过SDK Manager更新最新版android compatibility package, revision 3
更新后,在eclipse中工程上点击右键,选择android tools -> add compatibility library即可完成安装
实际上就是一个jar包,手工导到工程中也可
jar包所在位置是\android-sdk\extras\android\compatibility\v4\android-support-v4.jar
至此准备环境已经ok 下边还是通过代码进行说话吧
准备布局文件
viewpager_layout.xml
1 | <? xml version = "1.0" encoding = "utf-8" ?> |
2 | < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" |
3 |
android:layout_width = "fill_parent" |
4 |
android:layout_height = "fill_parent" android:orientation = "vertical" > |
6 | < android.support.v4.view.ViewPager |
7 |
android:id = "@+id/viewpagerLayout" android:layout_height = "fill_parent" android:layout_width = "fill_parent" /> |
layout1.xml
1 | <? xml version = "1.0" encoding = "utf-8" ?> |
2 | < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" |
3 |
android:layout_width = "fill_parent" |
4 |
android:layout_height = "fill_parent" android:orientation = "vertical" > |
5 |
< TextView android:textAppearance = "?android:attr/textAppearanceLarge" android:layout_height = "wrap_content" android:id = "@+id/textView1" android:layout_width = "fill_parent" android:text = "第一页" ></ TextView > |
6 |
< EditText android:layout_width = "match_parent" android:layout_height = "wrap_content" android:id = "@+id/editText1" > |
7 |
< requestFocus ></ requestFocus > |
layout2.xml
1 | <? xml version = "1.0" encoding = "utf-8" ?> |
2 | < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" |
3 |
android:layout_width = "fill_parent" |
4 |
android:layout_height = "fill_parent" android:orientation = "vertical" > |
5 |
< TextView android:textAppearance = "?android:attr/textAppearanceLarge" android:layout_height = "wrap_content" android:id = "@+id/textView1" android:layout_width = "fill_parent" android:text = "第二页" ></ TextView > |
6 |
< EditText android:layout_width = "match_parent" android:layout_height = "wrap_content" android:id = "@+id/editText1" > |
7 |
< requestFocus ></ requestFocus > |
layout3.xml
1 | <? xml version = "1.0" encoding = "utf-8" ?> |
2 | < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" |
3 |
android:layout_width = "fill_parent" |
4 |
android:layout_height = "fill_parent" android:orientation = "vertical" > |
5 |
< TextView android:textAppearance = "?android:attr/textAppearanceLarge" android:layout_height = "wrap_content" android:id = "@+id/textView1" android:layout_width = "fill_parent" android:text = "第三页" ></ TextView > |
6 |
< EditText android:layout_width = "match_parent" android:layout_height = "wrap_content" android:id = "@+id/editText1" > |
7 |
< requestFocus ></ requestFocus > |
主程序
003 | import java.util.ArrayList; |
004 | import java.util.List; |
006 | import android.app.Activity; |
007 | import android.os.Bundle; |
008 | import android.os.Parcelable; |
009 | import android.support.v4.view.PagerAdapter; |
010 | import android.support.v4.view.ViewPager; |
011 | import android.support.v4.view.ViewPager.OnPageChangeListener; |
012 | import android.util.Log; |
013 | import android.view.LayoutInflater; |
014 | import android.view.View; |
015 | import android.widget.EditText; |
017 | public class TestViewPager extends Activity { |
018 |
private ViewPager myViewPager; |
020 |
private MyPagerAdapter myAdapter; |
022 |
private LayoutInflater mInflater; |
023 |
private List<View> mListViews; |
024 |
private View layout1 = null ; |
025 |
private View layout2 = null ; |
026 |
private View layout3 = null ; |
029 |
protected void onCreate(Bundle savedInstanceState) { |
030 |
super .onCreate(savedInstanceState); |
031 |
setContentView(R.layout.viewpager_layout); |
032 |
myAdapter = new MyPagerAdapter(); |
033 |
myViewPager = (ViewPager) findViewById(R.id.viewpagerLayout); |
034 |
myViewPager.setAdapter(myAdapter); |
036 |
mListViews = new ArrayList<View>(); |
037 |
mInflater = getLayoutInflater(); |
038 |
layout1 = mInflater.inflate(R.layout.layout1, null ); |
039 |
layout2 = mInflater.inflate(R.layout.layout2, null ); |
040 |
layout3 = mInflater.inflate(R.layout.layout3, null ); |
042 |
mListViews.add(layout1); |
043 |
mListViews.add(layout2); |
044 |
mListViews.add(layout3); |
047 |
myViewPager.setCurrentItem( 1 ); |
050 |
EditText v2EditText = (EditText)layout2.findViewById(R.id.editText1); |
051 |
v2EditText.setText( "动态设置第二个view的值" ); |
053 |
myViewPager.setOnPageChangeListener( new OnPageChangeListener() { |
056 |
public void onPageSelected( int arg0) { |
057 |
Log.d( "k" , "onPageSelected - " + arg0); |
059 |
View v = mListViews.get(arg0); |
060 |
EditText editText = (EditText)v.findViewById(R.id.editText1); |
061 |
editText.setText( "动态设置#" +arg0+ "edittext控件的值" ); |
065 |
public void onPageScrolled( int arg0, float arg1, int arg2) { |
066 |
Log.d( "k" , "onPageScrolled - " + arg0); |
071 |
public void onPageScrollStateChanged( int arg0) { |
072 |
Log.d( "k" , "onPageScrollStateChanged - " + arg0); |
075 |
* Indicates that the pager is in an idle, settled state. The current page |
076 |
* is fully in view and no animation is in progress. |
080 |
* Indicates that the pager is currently being dragged by the user. |
084 |
* Indicates that the pager is in the process of settling to a final position. |
093 |
private class MyPagerAdapter extends PagerAdapter{ |
096 |
public void destroyItem(View arg0, int arg1, Object arg2) { |
097 |
Log.d( "k" , "destroyItem" ); |
098 |
((ViewPager) arg0).removeView(mListViews.get(arg1)); |
102 |
public void finishUpdate(View arg0) { |
103 |
Log.d( "k" , "finishUpdate" ); |
107 |
public int getCount() { |
108 |
Log.d( "k" , "getCount" ); |
109 |
return mListViews.size(); |
113 |
public Object instantiateItem(View arg0, int arg1) { |
114 |
Log.d( "k" , "instantiateItem" ); |
115 |
((ViewPager) arg0).addView(mListViews.get(arg1), 0 ); |
116 |
return mListViews.get(arg1); |
120 |
public boolean isViewFromObject(View arg0, Object arg1) { |
121 |
Log.d( "k" , "isViewFromObject" ); |
126 |
public void restoreState(Parcelable arg0, ClassLoader arg1) { |
127 |
Log.d( "k" , "restoreState" ); |
131 |
public Parcelable saveState() { |
132 |
Log.d( "k" , "saveState" ); |
137 |
public void startUpdate(View arg0) { |
138 |
Log.d( "k" , "startUpdate" ); |
在实机上测试后,非常流畅,这也就是说官方版的左右滑屏控件已经实现 目前,关于viewpager的文章非常少,本文是通过阅读viewpager源代码分析出的写法 当然此文章仅是抛砖引玉,而且属于框架式程序,目的就是让读者了解API的基本用法 希望这篇原创文章对大家有帮助 欢迎感兴趣的朋友一起讨论 共同学习,共同进步 另外,ViewPager的注释上有这么一段话,大体意思是该控件目前属于早期实现,后续会有修改
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