android用ViewPager实现欢迎界面

一、页面布局文件

welcome.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <android.support.v4.view.ViewPager        android:id="@+id/viewpager_welcome"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_alignParentLeft="true"        android:layout_alignParentRight="true"        android:layout_alignParentTop="true" >    </android.support.v4.view.ViewPager></RelativeLayout>

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welcome_one.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:background="@drawable/bg_icon"        android:gravity="center"        android:text="one"        android:textAppearance="?android:attr/textAppearanceLarge" /></LinearLayout>

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welcome_two.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:background="@drawable/bg_icon"        android:gravity="center"        android:text="two"        android:textAppearance="?android:attr/textAppearanceLarge" /></LinearLayout>

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welcom_three.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <TextView        android:id="@+id/tv_welcomethree"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:background="@drawable/bg_icon"        android:gravity="center"        android:text="three"        android:textAppearance="?android:attr/textAppearanceLarge" />            <Button        android:id="@+id/btn_justtogo"        android:layout_width="match_parent"        android:layout_height="wrap_content"             android:text="登录"/>    </LinearLayout>

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WelcomeActivity.java

package com.mytest.huilife;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.support.v4.view.ViewPager;import android.view.View;import android.widget.Button;import android.widget.Toast;public class WelcomeActivity extends Activity {        private List<View> welPageList;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.welcome);                    View welOne = getLayoutInflater().inflate(R.layout.welcome_one, null);        View welTwo = getLayoutInflater().inflate(R.layout.welcome_two, null);        View welThree = getLayoutInflater().inflate(R.layout.welcome_three, null);        List<View> pageList = new ArrayList<View>();        pageList.add(welOne);        pageList.add(welTwo);        pageList.add(welThree);                ViewPager viewPager = (ViewPager) this.findViewById(R.id.viewpager_welcome);        viewPager.setAdapter(new WelcomePagerAdapter(pageList));        Button btnJusttogo = (Button)welThree.findViewById(R.id.btn_justtogo);        btnJusttogo.setOnClickListener(new View.OnClickListener() {                        @Override            public void onClick(View v) {                Toast.makeText(WelcomeActivity.this, "just to go ", Toast.LENGTH_SHORT).show();            }        });                    }}

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WelcomePagerAdapter.java

package com.mytest.huilife;import java.util.List;import android.os.Parcelable;import android.support.v4.view.PagerAdapter;import android.view.View;import android.view.ViewGroup;public class WelcomePagerAdapter extends PagerAdapter {    private List<View> pageList;    public WelcomePagerAdapter(List<View> pageList) {        this.pageList = pageList;    }    @Override    public void destroyItem(View arg0, int arg1, Object arg2) {        ViewGroup vg = (ViewGroup) arg0;        vg.removeView(pageList.get(arg1));    }    @Override    public void finishUpdate(View arg0) {    }    @Override    public int getCount() {        return pageList.size();    }    @Override    public Object instantiateItem(View arg0, int arg1) {        ViewGroup vg = (ViewGroup) arg0;        vg.addView(pageList.get(arg1));        return pageList.get(arg1);    }    @Override    public boolean isViewFromObject(View arg0, Object arg1) {        return arg0 == arg1;    }    @Override    public void restoreState(Parcelable arg0, ClassLoader arg1) {    }    @Override    public Parcelable saveState() {        return null;    }    @Override    public void startUpdate(View arg0) {    }}

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