android引导页viewpager实现

每一个优质的APP都会有一个引导页。

试过用viewflipper，但效果比较生硬。所以尝试了viewpager。

需求分析：

程序安装后第一次启动：

启动页-->功能引导页-->应用主页

以后启动:

启动页-->应用主页

实现原理：

用SharedPreferences实现。

创建一个boolean的变量，默认值为true。

当判断这个变量是true的时候，说明是第一次运行，就跳转到另一个引导页面。

引导页面跳转到最后一张图片时，点击某按钮发生跳转事件，回到MainActivity,此时把变量的值改成false。

引导图效果用ViewPager可以很轻松的实现。

布局文件

1.splash.xml:

1<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
2    xmlns:tools="http://schemas.android.com/tools"
3    android:layout_width="match_parent"
4    android:layout_height="match_parent"
5    tools:context=".SplashActivity" >
6
7    <ImageView
8        android:layout_width="match_parent"
9        android:layout_height="match_parent"
10        android:adjustViewBounds="true"
11        android:background="@drawable/welcome_android"
12        android:scaleType="centerCrop" />
13
14</RelativeLayout>

2.guide.xml

<?xml version="1.0" encoding="utf-8"?>
2<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
3    android:layout_width="match_parent"
4    android:layout_height="match_parent"
5    android:orientation="vertical" >
6
7    <android.support.v4.view.ViewPager
8        android:id="@+id/viewpager"
9        android:layout_width="match_parent"
10        android:layout_height="match_parent" />
11
12    <LinearLayout
13        android:id="@+id/ll"
14        android:layout_width="wrap_content"
15        android:layout_height="wrap_content"
16        android:layout_alignParentBottom="true"
17        android:layout_centerHorizontal="true"
18        android:layout_marginBottom="24.0dp"
19        android:orientation="horizontal" >
20
21        <ImageView
22            android:layout_width="wrap_content"
23            android:layout_height="wrap_content"
24            android:layout_gravity="center_vertical"
25            android:clickable="true"
26            android:padding="15.0dip"
27            android:src="@drawable/dot" />
28
29        <ImageView
30            android:layout_width="wrap_content"
31            android:layout_height="wrap_content"
32            android:layout_gravity="center_vertical"
33            android:clickable="true"
34            android:padding="15.0dip"
35            android:src="@drawable/dot" />
36
37        <ImageView
38            android:layout_width="wrap_content"
39            android:layout_height="wrap_content"
40            android:layout_gravity="center_vertical"
41            android:clickable="true"
42            android:padding="15.0dip"
43            android:src="@drawable/dot" />
44
45        <ImageView
46            android:layout_width="wrap_content"
47            android:layout_height="wrap_content"
48            android:layout_gravity="center_vertical"
49            android:clickable="true"
50            android:padding="15.0dip"
51            android:src="@drawable/dot" />
52    </LinearLayout>
53
54</RelativeLayout>

main_activity.xml默认

what_new_one.xml、what_new_two.xml、what_new_three.xml

1<?xml version="1.0" encoding="utf-8"?>
2<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
3    android:layout_width="match_parent"
4    android:layout_height="match_parent" >
5
6    <ImageView
7        android:layout_width="match_parent"
8        android:layout_height="match_parent"
9        android:layout_centerInParent="true"
10        android:adjustViewBounds="false"
11        android:focusable="true"
12        android:scaleType="centerCrop"
13        android:background="@drawable/guide_350_01" />
14
15</RelativeLayout>

what_new_four.xml:

<?xml version="1.0" encoding="utf-8"?>
2<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
3    android:layout_width="match_parent"
4    android:layout_height="match_parent" >
5
6    <ImageView
7        android:layout_width="match_parent"
8        android:layout_height="match_parent"
9        android:layout_centerInParent="true"
10        android:adjustViewBounds="false"
11        android:background="@drawable/guide_350_04"
12        android:focusable="true"
13        android:scaleType="centerCrop" />
14
15    <ImageView
16        android:id="@+id/iv_start_weibo"
17        android:layout_width="wrap_content"
18        android:layout_height="wrap_content"
19        android:layout_alignParentBottom="true"
20        android:layout_centerHorizontal="true"
21        android:layout_marginBottom="108dp"
22        android:background="@drawable/whats_new_start_btn"
23        android:focusable="true" />
24
25</RelativeLayout>

MainActivity.java不变

SplashActivity.java:

import android.app.Activity;
4import android.content.Intent;
5import android.content.SharedPreferences;
6import android.os.Bundle;
7import android.os.Handler;
8import android.os.Message;
9
10/**
11 *
12 * @{# SplashActivity.java Create on 2016-3-5 下午9:10:01
13 *
14 *     class desc: 启动画面 (1)判断是否是首次加载应用--采取读取SharedPreferences的方法
15 *     (2)是，则进入GuideActivity；否，则进入MainActivity (3)3s后执行(2)操作
16 *
17 *     <p>
18 *     Copyright: Copyright(c) 2016
19 *     </p>
20 * @Version 1.0
21 * @Author <a href="chanilix@Foxmail.com">
22 *
23 *
24 */
25public class SplashActivity extends Activity {
26    boolean isFirstIn = false;
27
28    private static final int GO_HOME = 1000;
29    private static final int GO_GUIDE = 1001;
30    // 延迟3秒
31    private static final long SPLASH_DELAY_MILLIS = 3000;
32
33    private static final String SHAREDPREFERENCES_NAME = "first_pref";
34
35    /**
36     * Handler:跳转到不同界面
37     */
38    private Handler mHandler = new Handler() {
39
40        @Override
41        public void handleMessage(Message msg) {
42            switch (msg.what) {
43            case GO_HOME:
44                goHome();
45                break;
46            case GO_GUIDE:
47                goGuide();
48                break;
49            }
50            super.handleMessage(msg);
51        }
52    };
53
54    @Override
55    protected void onCreate(Bundle savedInstanceState) {
56        super.onCreate(savedInstanceState);
57        setContentView(R.layout.splash);
58
59        init();
60    }
61
62    private void init() {
63        // 读取SharedPreferences中需要的数据
64        // 使用SharedPreferences来记录程序的使用次数
65        SharedPreferences preferences = getSharedPreferences(
66                SHAREDPREFERENCES_NAME, MODE_PRIVATE);
67
68        // 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
69        isFirstIn = preferences.getBoolean("isFirstIn", true);
70
71        // 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
72        if (!isFirstIn) {
73            // 使用Handler的postDelayed方法，3秒后执行跳转到MainActivity
74            mHandler.sendEmptyMessageDelayed(GO_HOME, SPLASH_DELAY_MILLIS);
75        } else {
76            mHandler.sendEmptyMessageDelayed(GO_GUIDE, SPLASH_DELAY_MILLIS);
77        }
78
79    }
80
81    private void goHome() {
82        Intent intent = new Intent(SplashActivity.this, MainActivity.class);
83        SplashActivity.this.startActivity(intent);
84        SplashActivity.this.finish();
85    }
86
87    private void goGuide() {
88        Intent intent = new Intent(SplashActivity.this, GuideActivity.class);
89        SplashActivity.this.startActivity(intent);
90        SplashActivity.this.finish();
91    }
92}
93

GuideActivity.java:

mport java.util.ArrayList;
4import java.util.List;
5
6import android.app.Activity;
7import android.os.Bundle;
8import android.support.v4.view.ViewPager;
9import android.support.v4.view.ViewPager.OnPageChangeListener;
10import android.view.LayoutInflater;
11import android.view.View;
12import android.widget.ImageView;
13import android.widget.LinearLayout;
14import cn.eoe.leigo.splash.adapter.ViewPagerAdapter;
15
16/**
17 *
18 * @{# GuideActivity.java Create on 2016-3-5 下午10:59:08
19 *
20 *     class desc: 引导界面
21 *
22 *     <p>
23 *     Copyright: Copyright(c) 2016
24 *     </p>
25 * @Version 1.0
26 * @Author <a href="chanilix@Foxmail.com">
27 *
28 *
29 */
30public class GuideActivity extends Activity implements OnPageChangeListener {
31
32    private ViewPager vp;
33    private ViewPagerAdapter vpAdapter;
34    private List<View> views;
35
36    // 底部小点图片
37    private ImageView[] dots;
38
39    // 记录当前选中位置
40    private int currentIndex;
41
42    @Override
43    protected void onCreate(Bundle savedInstanceState) {
44        super.onCreate(savedInstanceState);
45        setContentView(R.layout.guide);
46
47        // 初始化页面
48        initViews();
49
50        // 初始化底部小点
51        initDots();
52    }
53
54    private void initViews() {
55        LayoutInflater inflater = LayoutInflater.from(this);
56
57        views = new ArrayList<View>();
58        // 初始化引导图片列表
59        views.add(inflater.inflate(R.layout.what_new_one, null));
60        views.add(inflater.inflate(R.layout.what_new_two, null));
61        views.add(inflater.inflate(R.layout.what_new_three, null));
62        views.add(inflater.inflate(R.layout.what_new_four, null));
63
64        // 初始化Adapter
65        vpAdapter = new ViewPagerAdapter(views, this);
66
67        vp = (ViewPager) findViewById(R.id.viewpager);
68        vp.setAdapter(vpAdapter);
69        // 绑定回调
70        vp.setOnPageChangeListener(this);
71    }
72
73    private void initDots() {
74        LinearLayout ll = (LinearLayout) findViewById(R.id.ll);
75
76        dots = new ImageView[views.size()];
77
78        // 循环取得小点图片
79        for (int i = 0; i < views.size(); i++) {
80            dots[i] = (ImageView) ll.getChildAt(i);
81            dots[i].setEnabled(true);// 都设为灰色
82        }
83
84        currentIndex = 0;
85        dots[currentIndex].setEnabled(false);// 设置为白色，即选中状态
86    }
87
88    private void setCurrentDot(int position) {
89        if (position < 0 || position > views.size() - 1
90                || currentIndex == position) {
91            return;
92        }
93
94        dots[position].setEnabled(false);
95        dots[currentIndex].setEnabled(true);
96
97        currentIndex = position;
98    }
99
100    // 当滑动状态改变时调用
101    @Override
102    public void onPageScrollStateChanged(int arg0) {
103    }
104
105    // 当当前页面被滑动时调用
106    @Override
107    public void onPageScrolled(int arg0, float arg1, int arg2) {
108    }
109
110    // 当新的页面被选中时调用
111    @Override
112    public void onPageSelected(int arg0) {
113        // 设置底部小点选中状态
114        setCurrentDot(arg0);
115    }
116
117}
118

ViewPagerAdapter.java:

import java.util.List;
4
5import android.app.Activity;
6import android.content.Context;
7import android.content.Intent;
8import android.content.SharedPreferences;
9import android.content.SharedPreferences.Editor;
10import android.os.Parcelable;
11import android.support.v4.view.PagerAdapter;
12import android.support.v4.view.ViewPager;
13import android.view.View;
14import android.view.View.OnClickListener;
15import android.widget.ImageView;
16import cn.eoe.leigo.splash.MainActivity;
17import cn.eoe.leigo.splash.R;
18
19/**
20 *
21 * @{# ViewPagerAdapter.java Create on 2016-3-5 下午11:03:39
22 *
23 *     class desc: 引导页面适配器
24 *
25 *     <p>
26 *     Copyright: Copyright(c) 2016
27 *     </p>
28 * @Version 1.0
29 * @Author <a href="chanilix@foxmail.com">Leo</a>
30 *
31 *
32 */
33public class ViewPagerAdapter extends PagerAdapter {
34
35    // 界面列表
36    private List<View> views;
37    private Activity activity;
38
39    private static final String SHAREDPREFERENCES_NAME = "first_pref";
40
41    public ViewPagerAdapter(List<View> views, Activity activity) {
42        this.views = views;
43        this.activity = activity;
44    }
45
46    // 销毁arg1位置的界面
47    @Override
48    public void destroyItem(View arg0, int arg1, Object arg2) {
49        ((ViewPager) arg0).removeView(views.get(arg1));
50    }
51
52    @Override
53    public void finishUpdate(View arg0) {
54    }
55
56    // 获得当前界面数
57    @Override
58    public int getCount() {
59        if (views != null) {
60            return views.size();
61        }
62        return 0;
63    }
64
65    // 初始化arg1位置的界面
66    @Override
67    public Object instantiateItem(View arg0, int arg1) {
68        ((ViewPager) arg0).addView(views.get(arg1), 0);
69        if (arg1 == views.size() - 1) {
70            ImageView mStartWeiboImageButton = (ImageView) arg0
71                    .findViewById(R.id.iv_start_weibo);
72            mStartWeiboImageButton.setOnClickListener(new OnClickListener() {
73
74                @Override
75                public void onClick(View v) {
76                    // 设置已经引导
77                    setGuided();
78                    goHome();
79
80                }
81
82            });
83        }
84        return views.get(arg1);
85    }
86
87    private void goHome() {
88        // 跳转
89        Intent intent = new Intent(activity, MainActivity.class);
90        activity.startActivity(intent);
91        activity.finish();
92    }
93
94    /**
95     *
96     * method desc：设置已经引导过了，下次启动不用再次引导
97     */
98    private void setGuided() {
99        SharedPreferences preferences = activity.getSharedPreferences(
100                SHAREDPREFERENCES_NAME, Context.MODE_PRIVATE);
101        Editor editor = preferences.edit();
102        // 存入数据
103        editor.putBoolean("isFirstIn", false);
104        // 提交修改
105        editor.commit();
106    }
107
108    // 判断是否由对象生成界面
109    @Override
110    public boolean isViewFromObject(View arg0, Object arg1) {
111        return (arg0 == arg1);
112    }
113
114    @Override
115    public void restoreState(Parcelable arg0, ClassLoader arg1) {
116    }
117
118    @Override
119    public Parcelable saveState() {
120        return null;
121    }
122
123    @Override
124    public void startUpdate(View arg0) {
125    }
126
127}
128

github源码