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Android引导界面(1)

关键词:Android引导界面  阅读(1707) 赞(39)

[摘要]本文是对Android引导界面的讲解,对学习Android编程技术有所帮助,与大家分享。

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。

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dark_dotguide1guide2guide3guide4logoweather_bg

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>
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