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使用ViewPager实现android软件使用向导功能实现步骤

2020-04-11 11:59:55
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首先需要一个布局文件,是FlameLayout组成的,里面包含了一个ViewPager和一个RelativeLayout,RelativeLayout里面是一个LinearLayout,LinearLayout里面是准备放ImageView,动态添加。

布局文件如下:

复制代码 代码如下:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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/guidePages"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center" />

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom">
        <LinearLayout
            android:id="@+id/viewGroup"
            android:layout_alignParentBottom="true"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:gravity="center"
            android:layout_marginBottom="30dip">

        </LinearLayout>
    </RelativeLayout>
</FrameLayout>

另外我们需要4个布局文件,就是向导要显示的图片,每个布局文件是一页,每个布局文件里面都是一个ImageView。如下所示:

布局文件一:

复制代码 代码如下:

<?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:orientation="vertical" >

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/feature_guide_0"/>"

</LinearLayout>

布局文件二:

复制代码 代码如下:

<?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:orientation="vertical" >

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/feature_guide_1"/>

</LinearLayout>

布局文件三:

复制代码 代码如下:

<?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:orientation="vertical" >

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/feature_guide_2"/>"

</LinearLayout>

布局文件四:

复制代码 代码如下:

<?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:orientation="vertical" >

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/feature_guide_3"/>"

</LinearLayout>

然后在代码里面加载这4个布局文件和主布局文件:

Activity代码:

复制代码 代码如下:

package com.alex.helloworld;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.view.Window;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class HelloWord2 extends Activity implements OnPageChangeListener {

    private ArrayList<View> mPageViews;
    private LayoutInflater mInflater;
    private LinearLayout mGroups;
    private FrameLayout mMain;
    private ViewPager mViewPager;
    private ImageView[] mImageViews;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        mInflater = LayoutInflater.from(this);
        mPageViews = new ArrayList<View>();
        mPageViews.add(mInflater.inflate(R.layout.item_0, null));
        mPageViews.add(mInflater.inflate(R.layout.item_1, null));
        mPageViews.add(mInflater.inflate(R.layout.item_2, null));
        mPageViews.add(mInflater.inflate(R.layout.item_3, null));

        mMain = (FrameLayout) mInflater.inflate(R.layout.hello2, null);
        mGroups = (LinearLayout) mMain.findViewById(R.id.viewGroup);
        mViewPager = (ViewPager) mMain.findViewById(R.id.guidePages);
        mImageViews = new ImageView[mPageViews.size()];

        for(int i=0; i<mPageViews.size(); i++) {
            ImageView iv = new ImageView(this);
            iv.setLayoutParams(new LayoutParams(20, 20));
            mImageViews[i] = iv;
            if(i == 0) {
                mImageViews[i].setBackgroundResource(R.drawable.page_indicator_focused);
            } else {
                mImageViews[i].setBackgroundResource(R.drawable.page_indicator);
            }
            mGroups.addView(mImageViews[i]);
        }
        mViewPager.setAdapter(mPageAdapter);
        mViewPager.setOnPageChangeListener(this);
        setContentView(mMain);
    }

    private PagerAdapter mPageAdapter = new PagerAdapter() {

        @Override
        public void startUpdate(View arg0) {

        }

        @Override
        public Parcelable saveState() {
            return null;
        }

        @Override
        public void restoreState(Parcelable arg0, ClassLoader arg1) {

        }

        @Override
        public boolean isViewFromObject(View arg0, Object arg1) {
            return arg0 == arg1;
        }

        @Override
        public Object instantiateItem(View arg0, int arg1) {
            ((ViewPager)arg0).addView(mPageViews.get(arg1));
            return mPageViews.get(arg1);
        }

        @Override
        public int getCount() {
            return mPageViews.size();
        }

        @Override
        public void finishUpdate(View arg0) {

        }

        @Override
        public void destroyItem(View arg0, int arg1, Object arg2) {
            ((ViewPager)arg0).removeView(mPageViews.get(arg1));
        }
    };

    @Override
    public void onPageScrolled(int position, float positionOffset,
            int positionOffsetPixels) {

    }

    @Override
    public void onPageSelected(int position) {
        for(int i=0; i<mPageViews.size(); i++) {
            mImageViews[position].setBackgroundResource(R.drawable.page_indicator_focused);
            if(position != i) {
                mImageViews[i].setBackgroundResource(R.drawable.page_indicator);
            }
        }
    }

    @Override
    public void onPageScrollStateChanged(int state) {

    }
}

首先从LayoutInflater里面加载4个要显示的布局和主布局文件。

然后把布局文件作为View放到一个ArrayList里面。

然后从主布局里面找到ViewPager和LinearLayout,ViewPager用来装载4个布局文件,LinearLayout用来装载4个提示图标。

然后新建4个ImageView,并设置对应的背景,然后作为View添加到LinearLayout里面去。

然后给ViewPager设置Adapter,设置onPageChangeListener。

Adapter里面要设置getCount,就是页面的个数,我们这里是4个,就设置4;

同时在instantiateItem里面讲对应的页面add进去,并返回对应的页面。

在destroyItem的时候讲页面remove掉。

在选择页面的方法里面onPageSelected里面设置选中图标的背景。

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