导航页面ViewPager和欢迎界面的实现

来源：互联网发布：用u盘重装mac 编辑：程序博客网时间：2024/06/06 10:22

在activity_welcome.xml文件中，

在WelComeActivity.class文件中

package com.example.yuxue.learnviewpager;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Handler;
import android.os.Message;
import android.support.v4.app.NotificationCompatBase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class WelcomeActivityextendsAppCompatActivity {
    private static final int SLEEP_time=5000;//欢迎界面的显示时间
    private static final intGO_home=100;
    private static final int GO_Viewpager=101;
    private boolean isFirstIn=false; //记录是否是第一次进入APP
    Handler handler=newHandler(){
        @Override
        public voidhandleMessage(Message msg) {
            switch (msg.what){
                case GO_home://进入主界面
                    Intent intenthome=newIntent(WelcomeActivity.this,MainActivity.class);
                    startActivity(intenthome);
                    WelcomeActivity.this.finish();
                    break;
                case GO_Viewpager://进入导航页面
                    Intent intentviewpager=newIntent(WelcomeActivity.this,GuideActivity.class);
                    startActivity(intentviewpager);
                    WelcomeActivity.this.finish();
                    break;
            }
        }
    };
    @Override
    protected voidonCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_welcome);
        inits();
    }

    private void inits() {
        //用SharedPreferences保存是否第一次进入App的参数
        SharedPreferences sharedPreferences=getSharedPreferences("jike",MODE_PRIVATE);
        isFirstIn=sharedPreferences.getBoolean("isFirstIn",true);
        //判断是否是第一次进入APP
        if(isFirstIn){
            handler.sendEmptyMessageDelayed(GO_Viewpager,SLEEP_time);
            //修改 isFirstIn的值为false
            SharedPreferences.Editor editor=sharedPreferences.edit();
            editor.putBoolean("isFirstIn",false);
            editor.commit();

        }else {
            handler.sendEmptyMessageDelayed(GO_home,SLEEP_time);
        }
    }
}

在activity_guide.xml文件中

<?xml version="1.0"encoding="utf-8"?>
<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="com.example.yuxue.learnviewpager.GuideActivity">

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#ffffff"/>
    
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_alignParentBottom="true"
        android:gravity="center"
        android:background="@null">
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/point_black"
            android:id="@+id/ivpoint1"/>
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/point_white"
            android:id="@+id/ivpoint2"/>
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/point_white"
            android:id="@+id/ivpoint3"/>
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/point_white"
            android:id="@+id/ivpoint4"/>
    </LinearLayout>
</RelativeLayout>

在GuideActivity.class文件中

package com.example.yuxue.learnviewpager;

import android.content.Context;
import android.content.Intent;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import java.util.ArrayList;
import java.util.List;

public class GuideActivityextendsAppCompatActivity implementsViewPager.OnPageChangeListener{
    private ViewpagerAdaperviewpagerAdaper;
    private List<View> list;
    private ViewPager viewPager;
    private Button btnstarthome;
    private ImageView []imageViews_point;
    private int [] iv_id={R.id.ivpoint1,R.id.ivpoint2,R.id.ivpoint3,R.id.ivpoint4};
    @Override
    protected voidonCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_guide);
        initViewPager();
        initImageviewPoint();

    }

    private void initImageviewPoint() { //对点的图片进行初始化（找控件）
        imageViews_point=newImageView[list.size()];
        for (inti=0;i<list.size();i++){
            imageViews_point[i]= (ImageView) findViewById(iv_id[i]);
        }
        Log.e("Guide","initImageviewPoint()>>>>>>>>>>");
    }

    private void initViewPager() {//配置Viewpager
        LayoutInflater inflater=LayoutInflater.from(this);
        list=newArrayList<View>();
        list.add(inflater.inflate(R.layout.guidepager1,null));
        list.add(inflater.inflate(R.layout.guidepager2,null));
        list.add(inflater.inflate(R.layout.guidepager3,null));
        list.add(inflater.inflate(R.layout.guidepager4,null));
        viewpagerAdaper=newViewpagerAdaper(list,this);
        viewPager= (ViewPager) findViewById(R.id.viewpager);
        viewPager.setAdapter(viewpagerAdaper);
        //找到guidepager4页面的控件按钮
        btnstarthome= (Button)list.get(3).findViewById(R.id.btnstarthome);
        btnstarthome.setOnClickListener(newView.OnClickListener() {
            @Override
            public voidonClick(View v) {
                //跳转到主界面并杀死导航页面
                Intent intent=newIntent(GuideActivity.this,MainActivity.class);
                startActivity(intent);
                GuideActivity.this.finish();
            }
        });
        viewPager.setOnPageChangeListener(this);   //监听ViewPager
        Log.e("Guide","initViewPager()>>>>>>>>>>");
    }

    @Override
    //当ViewPager当前新的页面被选中时调用
    public voidonPageSelected(intposition) {
        for (inti=0;i<iv_id.length;i++){
            //当ViewPager的页面的下标等于i，就把点的图标换为黑色的，否则就换为白色
            if(position==i){
                imageViews_point[i].setImageResource(R.drawable.point_black);
            }else {
                imageViews_point[i].setImageResource(R.drawable.point_white);
            }
        }
        Log.e("Guide","onPageSelected()>>>>>>>>>>");
    }

    @Override
    //当ViewPager的页面被滑动时调用
    public voidonPageScrolled(intposition, float positionOffset,intpositionOffsetPixels) {

    }

    @Override
    //当ViewPager的滑动状态改变时调用
    public voidonPageScrollStateChanged(intstate) {

    }

    //定义一个内部类用作adaper
    public classViewpagerAdaperextends PagerAdapter{
        private List<View>viewList;
        private Context context;

        public ViewpagerAdaper(List<View> viewList, Context context) {
            this.viewList= viewList;
            this.context= context;
        }

        @Override
        //销毁一个View
        public voiddestroyItem(ViewGroup container,intposition, Object object) {
            container.removeView(viewList.get(position));
        }

        @Override
        //加载View
        publicObject instantiateItem(ViewGroup container,intposition) {
            container.addView(viewList.get(position));
            return viewList.get(position);
        }

        @Override
        //返回当前View的数量
        public intgetCount() {
            return viewList.size();
        }

        @Override
        //判断当前的View是不是我们需要的一个对象
        public booleanisViewFromObject(View view, Object object) {
            return (view==object);
        }
    }
}

其中guidepager1.xml与guidepager3布局都相同，除了图片不一样就只写一个了

<?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">
    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/guide1"/>
</LinearLayout>

在guidepager4.xml文件中

<?xml version="1.0"encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/guide4"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:gravity="center"
        android:layout_marginBottom="127dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true">
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="进入主页面"
            android:textSize="30dp"
            android:background="@null"
            android:id="@+id/btnstarthome"/>
    </LinearLayout>
</RelativeLayout>

在manifest文件中

由于需要布局好看，我们在welcome和引导页去掉了ActionBar

<?xml version="1.0"encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.yuxue.learnviewpager">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity"></activity>
        <activity android:name=".GuideActivity"
            android:theme="@style/Theme.AppCompat.Light.NoActionBar">
        </activity>
        <activity android:name=".WelcomeActivity"
            android:theme="@style/Theme.AppCompat.Light.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>

</manifest>

以上就是基本的代码了，由于MainActivity和他的布局没有添加什么东西，我就不写了，第一次进入APP时，会进入欢迎界面——>导航界面——>主界面，以后就不会再次进入导航界面了

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