十八、Android引导界面

一、所需素材

      很有必要整理一下,里面附带友盟的社会化分享组件，我就不去掉了。

二、代码

import com.umeng.update.UmengUpdateAgent;

import android.app.Activity;

import android.content.Intent;

import android.content.SharedPreferences;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

public class SplashActivity extends Activity {

	private final int SPLASH_DISPLAY_LENGHT = 3000; // 延迟3秒  

	boolean isFirstIn = false;

    private static final int GO_HOME = 1000;

    private static final int GO_GUIDE = 1001;

    private static final String SHAREDPREFERENCES_NAME = "first_pref"; 

    @Override  

    protected void onCreate(Bundle savedInstanceState) {  

        super.onCreate(savedInstanceState);  

        setContentView(R.layout.activity_splash);  

        UmengUpdateAgent.update(this);

        init(); 

    }

    private Handler mHandler = new Handler() {

        @Override

        public void handleMessage(Message msg) {

            switch (msg.what) {

            case GO_HOME:

                goHome();

                break;

            case GO_GUIDE:

                goGuide();

                break;

            }

            super.handleMessage(msg);

        }

    };

    private void init() {

        // 读取SharedPreferences中需要的数据

        // 使用SharedPreferences来记录程序的使用次数

        SharedPreferences preferences = getSharedPreferences(

                SHAREDPREFERENCES_NAME, MODE_PRIVATE);

        // 取得相应的值，如果没有该值，说明还未写入，用true作为默认值

        isFirstIn = preferences.getBoolean("isFirstIn", true);

        // 判断程序与第几次运行，如果是第一次运行则跳转到引导界面，否则跳转到主界面

        if (!isFirstIn) {

            // 使用Handler的postDelayed方法，3秒后执行跳转到MainActivity

            mHandler.sendEmptyMessageDelayed(GO_HOME, SPLASH_DISPLAY_LENGHT);

        } else {

            mHandler.sendEmptyMessageDelayed(GO_GUIDE, SPLASH_DISPLAY_LENGHT);

           // preferences.edit().putBoolean("isFirstIn",false).commit();

        }

    }

    private void goGuide() {

        Intent intent = new Intent(SplashActivity.this, GuideActivity.class);

        SplashActivity.this.startActivity(intent);

        SplashActivity.this.finish();

    }

    private void goHome() {

        Intent intent = new Intent(SplashActivity.this, MainActivity.class);

        SplashActivity.this.startActivity(intent);

        SplashActivity.this.finish();

    }

}

---

<?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:background="@drawable/weather_bg"

    android:orientation="vertical" >

</LinearLayout>

---

import java.util.ArrayList;

import java.util.List;

import android.app.Activity;

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.widget.ImageView;

import android.widget.LinearLayout;

public class GuideActivity extends Activity implements OnPageChangeListener {

    private ViewPager vp;

    private ViewPagerAdapter vpAdapter;

    private List<View> views;

    // 底部小点图片

    private ImageView[] dots;

    // 记录当前选中位置

    private int currentIndex;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.guide);

        // 初始化页面

        initViews();

        // 初始化底部小点

        initDots();

    }

    private void initViews() {

    	/*

    	 * LayoutInflater inflater = getLayoutInflater();  //调用Activity的getLayoutInflater() 

    	 * LayoutInflater localinflater =  (LayoutInflater)context.getSystemService  

                                                 (Context.LAYOUT_INFLATER_SERVICE);  //最快

    	 */

        LayoutInflater inflater = LayoutInflater.from(this);

        views = new ArrayList<View>();

        // 初始化引导图片列表

        views.add(inflater.inflate(R.layout.what_new_one, null));

        views.add(inflater.inflate(R.layout.what_new_two, null));

        views.add(inflater.inflate(R.layout.what_new_three, null));

        views.add(inflater.inflate(R.layout.what_new_four, null));

        // 初始化Adapter

        vpAdapter = new ViewPagerAdapter(views, this);

        vp = (ViewPager) findViewById(R.id.viewpager);

        vp.setAdapter(vpAdapter);

        // 绑定回调

        vp.setOnPageChangeListener(this);

    }

    private void initDots() {

        LinearLayout ll = (LinearLayout) findViewById(R.id.ll);

        dots = new ImageView[views.size()];

        // 循环取得小点图片

        for (int i = 0; i < views.size(); i++) {

            dots[i] = (ImageView) ll.getChildAt(i);

            dots[i].setEnabled(true);// 都设为灰色

        }

        currentIndex = 0;

        dots[currentIndex].setEnabled(false);// 设置为白色，即选中状态

    }

    private void setCurrentDot(int position) {

        if (position < 0 || position > views.size() - 1

                || currentIndex == position) {

            return;

        }

        dots[position].setEnabled(false);

        dots[currentIndex].setEnabled(true);

        currentIndex = position;

    }

    // 当滑动状态改变时调用

    @Override

    public void onPageScrollStateChanged(int arg0) {

    }

    // 当当前页面被滑动时调用

    @Override

    public void onPageScrolled(int arg0, float arg1, int arg2) {

    }

    // 当新的页面被选中时调用

    @Override

    public void onPageSelected(int arg0) {

        // 设置底部小点选中状态

        setCurrentDot(arg0);

    }

}

---

<?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:orientation="vertical" >

    <android.support.v4.view.ViewPager

        android:id="@+id/viewpager"

        android:layout_width="match_parent"

        android:layout_height="match_parent" />

    <LinearLayout

        android:id="@+id/ll"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentBottom="true"

        android:layout_centerHorizontal="true"

        android:layout_marginBottom="24.0dp"

        android:orientation="horizontal" >

        <ImageView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_gravity="center_vertical"

            android:clickable="true"

            android:padding="15.0dip"

            android:src="@drawable/dot" />

        <ImageView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_gravity="center_vertical"

            android:clickable="true"

            android:padding="15.0dip"

            android:src="@drawable/dot" />

        <ImageView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_gravity="center_vertical"

            android:clickable="true"

            android:padding="15.0dip"

            android:src="@drawable/dot" />

        <ImageView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_gravity="center_vertical"

            android:clickable="true"

            android:padding="15.0dip"

            android:src="@drawable/dot" />

    </LinearLayout>

</RelativeLayout>

---

<?xml version="1.0" encoding="UTF-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/dark_dot" android:state_enabled="true"/>

    <item android:drawable="@drawable/white_dot" android:state_enabled="false"/>

</selector>

---

一二三一样，第四个多一个开始按钮，下面只列举第一第四个

<?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" >

    <ImageView

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:layout_centerInParent="true"

        android:adjustViewBounds="false"

        android:focusable="true"

        android:scaleType="centerCrop"

        android:background="@drawable/guide1" />

</RelativeLayout>

---

<?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" >

    <ImageView

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:layout_centerInParent="true"

        android:adjustViewBounds="false"

        android:background="@drawable/guide4"

        android:focusable="true"

        android:scaleType="centerCrop" />

    <ImageView

        android:id="@+id/iv_start"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentBottom="true"

        android:layout_centerHorizontal="true"

        android:layout_marginBottom="108dp"

        android:background="@drawable/whats_new_start_btn"

        android:focusable="true" />

</RelativeLayout>

---

package com.example.helloworld;

import java.util.List;

import android.app.Activity;

import android.content.Context;

import android.content.Intent;

import android.content.SharedPreferences;

import android.content.SharedPreferences.Editor;

import android.os.Parcelable;

import android.support.v4.view.PagerAdapter;

import android.support.v4.view.ViewPager;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.ImageView;

public class ViewPagerAdapter extends PagerAdapter {

    // 界面列表

    private List<View> views;

    private Activity activity;

    private static final String SHAREDPREFERENCES_NAME = "first_pref";

    public ViewPagerAdapter(List<View> views, Activity activity) {

        this.views = views;

        this.activity = activity;

    }

    // 销毁arg1位置的界面

    @Override

    public void destroyItem(View arg0, int arg1, Object arg2) {

        ((ViewPager) arg0).removeView(views.get(arg1));

    }

    @Override

    public void finishUpdate(View arg0) {

    }

    // 获得当前界面数

    @Override

    public int getCount() {

        if (views != null) {

            return views.size();

        }

        return 0;

    }

    // 初始化arg1位置的界面

    @Override

    public Object instantiateItem(View arg0, int arg1) {

        ((ViewPager) arg0).addView(views.get(arg1), 0);

        if (arg1 == views.size() - 1) {

            ImageView mStartWeiboImageButton = (ImageView) arg0

                    .findViewById(R.id.iv_start);

            mStartWeiboImageButton.setOnClickListener(new OnClickListener() {

                @Override

                public void onClick(View v) {

                    // 设置已经引导

                    setGuided();

                    goHome();

                }

            });

        }

        return views.get(arg1);

    }

    private void goHome() {

        // 跳转

        Intent intent = new Intent(activity, MainActivity.class);

        activity.startActivity(intent);

        activity.finish();

    }

    /**

     * 

     * method desc：设置已经引导过了，下次启动不用再次引导

     */

    private void setGuided() {

        SharedPreferences preferences = activity.getSharedPreferences(

                SHAREDPREFERENCES_NAME, Context.MODE_PRIVATE);

        Editor editor = preferences.edit();

        // 存入数据

        editor.putBoolean("isFirstIn", false);

        // 提交修改

        editor.commit();

    }

    // 判断是否由对象生成界面

    @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) {

    }

}

---

<?xml version="1.0" encoding="utf-8"?>

<selector

  xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_pressed="true" android:drawable="@drawable/butten_pressed" />

    <item android:drawable="@drawable/butten_unpress" />

</selector>