仿微信引导界面PageAdapter

来源：互联网发布：java 引号转义编辑：程序博客网时间：2024/06/05 15:35

本案例实现一个仿微信的引导界面，功能是在程序第一次下载启动后出现一个引导界面，以后再次打开不会出现了（只会在程序第一次启动的时出现）

实现步骤：

第一步;

写四个子布局page01.xml，page02.xml，page03.xml，page04.xml，作为启动以次显示的四个界面这里写了一个，其它三个类似

page01.xml

<?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="#8A2BE2"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:gravity="center"        android:text="page01"        android:textSize="40sp" >    </TextView></LinearLayout>

page04.xml第四个界面可以加入一个按钮，点击进入主界面：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#FFFF00" >    <TextView        android:id="@+id/textview_page04"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="page04"        android:textSize="40sp" >    </TextView>    <Button        android:layout_width="fill_parent"        android:layout_height="50dp"        android:layout_alignParentBottom="true"        android:text="点我进入"        android:onClick="startMain"        android:textSize="35sp" /></RelativeLayout>

第二步主界面中

<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=".Gudie_Activity" >    <android.support.v4.view.ViewPager        android:id="@+id/vp_viewpage"        android:layout_width="fill_parent"        android:layout_height="fill_parent" >    </android.support.v4.view.ViewPager></RelativeLayout>

第三步：activity中

package com.example.traffic;import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.view.LayoutInflater;import android.view.Menu;import android.view.View;import android.view.ViewGroup;public class Gudie_Activity extends Activity {private ViewPager viewpager;private List<View> children;private String filename = "config";private String firstRunning = "true";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_gudie_);SharedPreferences sp = getSharedPreferences(filename, MODE_PRIVATE);String config = sp.getString(firstRunning, null);if(config != null){Intent intent = new Intent(this, MainActivity.class);startActivity(intent);finish();}viewpager = (ViewPager) findViewById(R.id.vp_viewpage);children = new ArrayList<View>();children.add(LayoutInflater.from(this).inflate(R.layout.page01, null));children.add(getLayoutInflater().inflate(R.layout.page02, null));children.add(getLayoutInflater().inflate(R.layout.page03, null));children.add(getLayoutInflater().inflate(R.layout.page04, null));viewpager.setAdapter(new InnerPagerAdapter());}public class InnerPagerAdapter extends PagerAdapter{@Overridepublic int getCount() {//获取子级布局的数量return children.size();//返回viewpage容器中子级布局的个数，}@Overridepublic boolean isViewFromObject(View view, Object object) {// 判断某个View对象是否为当前被添加到ViewPager容器中的对象return view == object;}//下面两个方法是PageAdapter中必须实现的非抽象方法@Overridepublic Object instantiateItem(ViewGroup container, int position) {// 实例化ViewPager容器中指定的position位置需要显示的View对象View view = children.get(position);container.addView(view);return view;}@Overridepublic void destroyItem(ViewGroup container, int position, Object object) {//在ＶｉｅｗＰａｇｅｒ中移除指定的ｐｏｓｉｔｉｏｎ位置的Ｖｉｅｗ对象container.removeView(children.get(position));}}public void startMain(View v){SharedPreferences sp = getSharedPreferences(filename, MODE_PRIVATE);Editor editor = sp.edit();editor.putString(firstRunning, "false");editor.commit();Intent intent = new Intent(this,MainActivity.class);startActivity(intent);finish();//引导界面的Activity就会退出，回退栈中也会清除该Activity，点击回退按钮也不会回退到引导界面}}

0 0