1.涉及Android知識點：

      ViewPager元件、Handler機制、SharedPreferences。

2.開發實踐：

   a.佈局檔案設計。

     第一個引導介面one.xml，另外兩個佈局檔案類似。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ImageView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="@drawable/guide_1" />

</LinearLayout>
 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="#00000000" >
    </android.support.v4.view.ViewPager>

    <LinearLayout
        android:id="@+id/ll"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:gravity="center_horizontal"
        android:orientation="horizontal" >

        <ImageView
            android:id="@+id/iv1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/login_point_selected" />

        <ImageView
            android:id="@+id/iv2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/login_point" />

        <ImageView
            android:id="@+id/iv3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/login_point" />
    </LinearLayout>

</RelativeLayout>
 

b.Activity設計。

   引導介面主類Guide.java

package com.viewpagerdemo;

import java.util.ArrayList;
import java.util.List;

import com.jikexueyuan.viewpagerdemo.R;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class Guide extends Activity implements OnPageChangeListener {

	private ViewPager viewPager;
	private ViewPagerAdapter viewPagerAdapter;
	private List<View> views;
	private ImageView[] dots;
	private int[] ids = { R.id.iv1, R.id.iv2, R.id.iv3 };
	private Button start_btn;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.guide);
		initViews();
		initDots();
	}

	private void initViews() {
		LayoutInflater inflater = LayoutInflater.from(this);

		views = new ArrayList<View>();
		views.add(inflater.inflate(R.layout.one, null));
		views.add(inflater.inflate(R.layout.two, null));
		views.add(inflater.inflate(R.layout.three, null));

		viewPagerAdapter = new ViewPagerAdapter(views, this);
		viewPager = (ViewPager) findViewById(R.id.viewpager);
		viewPager.setAdapter(viewPagerAdapter);
		start_btn = (Button) views.get(2).findViewById(R.id.start_btn);
		start_btn.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View arg0) {
				Intent i = new Intent(Guide.this, MainActivity.class);
				startActivity(i);
				finish();
			}
		});

		viewPager.setOnPageChangeListener(this);
	}

	private void initDots() {
		dots = new ImageView[views.size()];
		for (int i = 0; i < views.size(); i++) {
			dots[i] = (ImageView) findViewById(ids[i]);
		}
	}

	@Override
	public void onPageScrollStateChanged(int arg0) {
		// TODO Auto-generated method stub

	}

	@Override
	public void onPageScrolled(int arg0, float arg1, int arg2) {
		// TODO Auto-generated method stub

	}

	@Override
	public void onPageSelected(int arg0) {
		for (int i = 0; i < ids.length; i++) {
			if (arg0 == i) {
				dots[i].setImageResource(R.drawable.login_point_selected);
			} else {
				dots[i].setImageResource(R.drawable.login_point);
			}
		}
	}

}
 

package com.viewpagerdemo;

import java.util.List;

import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;

public class ViewPagerAdapter extends PagerAdapter {

	private List<View> views;
	private Context context;

	public ViewPagerAdapter(List<View> views, Context context) {

		this.views = views;
		this.context = context;
	}

	@Override
	public void destroyItem(View container, int position, Object object) {

		((ViewPager) container).removeView(views.get(position));
	}

	@Override
	public Object instantiateItem(View container, int position) {

		((ViewPager) container).addView(views.get(position));

		return views.get(position);

	}

	@Override
	public int getCount() {
		return views.size();
	}

	@Override
	public boolean isViewFromObject(View arg0, Object arg1) {
		return (arg0 == arg1);
	}

}

c.歡迎介面設計和儲存首次使用程式標記類

   歡迎介面類WelcomeAct.java

package com.viewpagerdemo;

import com.jikexueyuan.viewpagerdemo.R;
import com.viewpagerdemo.util.Config;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.os.Handler;


public class WelcomeAct extends Activity {
	
	private boolean isFirstIn = false;
	private static final int TIME = 2000;
	private static final int GO_HOME = 1000;
	private static final int GO_GUIDE = 1001;
	private Config config;
	
	private Handler mHandler = new Handler(){
		public void handleMessage(android.os.Message msg) {
			switch (msg.what) {
			case GO_HOME:
				goHome();
				break;

			case GO_GUIDE:
				 goGuide();
				break;
			}
			
		};
	};
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.welcome);
		config =new Config(this);
		init();
	}
	
	private void init(){
		
		isFirstIn = config.getBoolean("isFirstIn");
		if (!isFirstIn) {
			mHandler.sendEmptyMessageDelayed(GO_HOME, TIME);
		}else{
			mHandler.sendEmptyMessageDelayed(GO_GUIDE, TIME);
			config.putBoolean("isFirstIn", false);
		}
		
	}
	
	private void goHome(){
		Intent i = new Intent(WelcomeAct.this,MainActivity.class);
		startActivity(i);
		finish();
	}
	private void goGuide(){
		Intent i = new Intent(WelcomeAct.this,Guide.class);
		startActivity(i);
		finish();
	}
	
}

package com.viewpagerdemo.util;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;

public class Config {

	private static final String CONFIG_NAME = "setting";
	private SharedPreferences sharedPreferences;
	private Editor editor ;
	public Config(Context context){
            sharedPreferences = context.getSharedPreferences(CONFIG_NAME, Context.MODE_PRIVATE);
            editor = sharedPreferences.edit();
	}
	
	public void putString(String key,String value){
		editor.putString(key, value);
		editor.commit();
	}
	
	public String getString(String key){
		return sharedPreferences.getString(key, "");
	}
	
	public void putBoolean(String key,boolean value){
		editor.putBoolean(key, value);
		editor.commit();
	}
	public boolean getBoolean(String key){
		return sharedPreferences.getBoolean(key, true);
	}
}

d.AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.jikexueyuan.viewpagerdemo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="14" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.viewpagerdemo.MainActivity"
            android:label="@string/app_name" >
        </activity>
        <activity android:name="com.viewpagerdemo.Guide" >
        </activity>
        <activity android:name="com.viewpagerdemo.WelcomeAct" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>