Android引導界面

一、所需素材

      很有必要整理一下,里面附帶友盟的社會化分享組件，我就不去掉了。

二、代碼

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; // 延遲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() {
        // 讀取SharedPreferences中需要的數據
        // 使用SharedPreferences來記錄程序的使用次數
        SharedPreferences preferences = getSharedPreferences(
                SHAREDPREFERENCES_NAME, MODE_PRIVATE);
        // 取得相應的值，如果沒有該值，說明還未寫入，用true作為默認值
        isFirstIn = preferences.getBoolean("isFirstIn", true);
        // 判斷程序與第幾次運行，如果是第一次運行則跳轉到引導界面，否則跳轉到主界面
        if (!isFirstIn) {
            // 使用Handler的postDelayed方法，3秒后執行跳轉到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;
    // 底部小點圖片
    private ImageView[] dots;
    // 記錄當前選中位置
    private int currentIndex;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.guide);
        // 初始化頁面
        initViews();
        // 初始化底部小點
        initDots();
    }
    private void initViews() {
    	/*
    	 * LayoutInflater inflater = getLayoutInflater();  //調用Activity的getLayoutInflater() 
    	 * LayoutInflater localinflater =  (LayoutInflater)context.getSystemService  
  
                                                 (Context.LAYOUT_INFLATER_SERVICE);  //最快
    	 */
        LayoutInflater inflater = LayoutInflater.from(this);
        views = new ArrayList<View>();
        // 初始化引導圖片列表
        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);
        // 綁定回調
        vp.setOnPageChangeListener(this);
    }
    private void initDots() {
        LinearLayout ll = (LinearLayout) findViewById(R.id.ll);
        dots = new ImageView[views.size()];
        // 循環取得小點圖片
        for (int i = 0; i < views.size(); i++) {
            dots[i] = (ImageView) ll.getChildAt(i);
            dots[i].setEnabled(true);// 都設為灰色
        }
        currentIndex = 0;
        dots[currentIndex].setEnabled(false);// 設置為白色，即選中狀態
    }
    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;
    }
    // 當滑動狀態改變時調用
    @Override
    public void onPageScrollStateChanged(int arg0) {
    }
    // 當當前頁面被滑動時調用
    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {
    }
    // 當新的頁面被選中時調用
    @Override
    public void onPageSelected(int arg0) {
        // 設置底部小點選中狀態
        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>

---

一二三一樣，第四個多一個開始按鈕，下面只列舉第一第四個

<?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;
    }
    // 銷毀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) {
    }
    // 獲得當前界面數
    @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) {
                    // 設置已經引導
                    setGuided();
                    goHome();
                }
            });
        }
        return views.get(arg1);
    }
    private void goHome() {
        // 跳轉
        Intent intent = new Intent(activity, MainActivity.class);
        activity.startActivity(intent);
        activity.finish();
    }
    /**
     * 
     * method desc：設置已經引導過了，下次啟動不用再次引導
     */
    private void setGuided() {
        SharedPreferences preferences = activity.getSharedPreferences(
                SHAREDPREFERENCES_NAME, Context.MODE_PRIVATE);
        Editor editor = preferences.edit();
        // 存入數據
        editor.putBoolean("isFirstIn", false);
        // 提交修改
        editor.commit();
    }
    // 判斷是否由對象生成界面
    @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>