现在的大多数应用都会有一个欢迎引导页面,
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。
1.布局文件
splash.xml:
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- <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
- xmlns:tools="http://schemas.android.com/tools"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- tools:context=".SplashActivity" >
- <ImageView
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:adjustViewBounds="true"
- android:background="@drawable/welcome_android"
- android:scaleType="centerCrop" />
- </RelativeLayout>
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guide.xml:
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- <?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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main_activity,.xml默认
what_new_one.xml、what_new_two.xml、what_new_three.xml(将图片名称改下就行了):
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- <?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/guide_350_01" />
- </RelativeLayout>
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what_new_four.xml:
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- <?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/guide_350_04"
- android:focusable="true"
- android:scaleType="centerCrop" />
- <ImageView
- android:id="@+id/iv_start_weibo"
- 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>
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MainActivity.java不变
SplashActivity.java:
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- package cn.eoe.leigo.splash;
- import android.app.Activity;
- import android.content.Intent;
- import android.content.SharedPreferences;
- import android.os.Bundle;
- import android.os.Handler;
- import android.os.Message;
- /**
- *
- * @{# SplashActivity.java Create on 2013-5-2 下午9:10:01
- *
- * 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
- * (2)是,则进入GuideActivity;否,则进入MainActivity (3)3s后执行(2)操作
- *
- * <p>
- * Copyright: Copyright(c) 2013
- * </p>
- * @Version 1.0
- * @Author <a href="mailto:gaolei_xj@163.com">Leo</a>
- *
- *
- */
- public class SplashActivity extends Activity {
- boolean isFirstIn = false;
- private static final int GO_HOME = 1000;
- private static final int GO_GUIDE = 1001;
- // 延迟3秒
- private static final long SPLASH_DELAY_MILLIS = 3000;
- private static final String SHAREDPREFERENCES_NAME = "first_pref";
- /**
- * Handler:跳转到不同界面
- */
- 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);
- }
- };
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.splash);
- init();
- }
- 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_DELAY_MILLIS);
- } else {
- mHandler.sendEmptyMessageDelayed(GO_GUIDE, SPLASH_DELAY_MILLIS);
- }
- }
- private void goHome() {
- Intent intent = new Intent(SplashActivity.this, MainActivity.class);
- SplashActivity.this.startActivity(intent);
- SplashActivity.this.finish();
- }
- private void goGuide() {
- Intent intent = new Intent(SplashActivity.this, GuideActivity.class);
- SplashActivity.this.startActivity(intent);
- SplashActivity.this.finish();
- }
- }
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GuideActivity.java:
ViewPagerAdapter.java:
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- package cn.eoe.leigo.splash.adapter;
- 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;
- import cn.eoe.leigo.splash.MainActivity;
- import cn.eoe.leigo.splash.R;
- /**
- *
- * @{# ViewPagerAdapter.java Create on 2013-5-2 下午11:03:39
- *
- * class desc: 引导页面适配器
- *
- * <p>
- * Copyright: Copyright(c) 2013
- * </p>
- * @Version 1.0
- * @Author <a href="mailto:gaolei_xj@163.com">Leo</a>
- *
- *
- */
- 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_weibo);
- 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) {
- }
- }
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