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Android开发之使用ViewPager实现导航页面（代码实现）

2018年09月29日  | 移动技术网IT编程  | 我要评论

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pageradapter类

public class guidepageadapter extends pageradapter {
    private list<view> views;
    public guidepageadapter(list<view> views) {
        this.views = views;
    }

    @override
    public int getcount() {
        if (views != null) {
            return views.size();
        }
        return 0;
    }

    @override
    public boolean isviewfromobject(view arg0, object arg1) {
        return (arg0 == arg1);
    }

    @override
    public void destroyitem(view view, int arg1, object object) {
        ((viewpager) view).removeview(views.get(arg1));
    }

    @override
    public object instantiateitem(final view view, final int current) {
        ((viewpager) view).addview(views.get(current));
        return views.get(current);
    }

}

导航类layout

<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="https://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:orientation="vertical" >

    <android.support.v4.view.viewpager
        android:id="@+id/vp_guide"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <textview
        android:id="@+id/myposition"
        android:layout_width="40dp"
        android:layout_height="20dp"
        android:layout_margintop="10dp"
        android:background="@drawable/onetebg"
        android:textcolor="@color/titleblue"
        android:gravity="center"
        android:layout_alignparentright="true"
        android:text="1"/>

</relativelayout>

onetebg背景样式

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="https://schemas.android.com/apk/res/android">

    <!-- 设置透明背景色 -->
    <solid android:color="@color/white" />

    <!-- 设置一个黑色边框 -->
    <stroke
        android:width="1px"
        android:color="@color/transparent" />
    <!-- 设置四个圆角的半径 -->
    <corners
        android:radius="14dp"/>
    <!-- 设置一下边距,让空间大一点 -->
    <padding
        android:bottom="0dp"
        android:left="0dp"
        android:right="0dp"
        android:top="0dp" />

</shape>

导航类activity

public class viewpageractivity extends activity {
    private viewpager vp;
    private textview textview;

    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        setcontentview(r.layout.guide_activity);
        initviews();
        initdata();
    }
    public void initviews(){
        vp = (viewpager) findviewbyid(r.id.vp_guide);
        textview =(textview)findviewbyid(r.id.myposition);
    }
    public void initdata(){
        list<view> guidelist = new arraylist<>();
        guidelist.add(getguideview(r.drawable.guide_1));
        guidelist.add(getguideview(r.drawable.guide_2));
        guidelist.add(getguideview(r.drawable.guide_3));
        relativelayout rl = new relativelayout(this);
//        rl.setlayoutparams(new viewgroup.layoutparams(viewgroup.layoutparams.match_parent, viewgroup.layoutparams.match_parent));
//        rl.setbackgroundcolor(this.getresources().getcolor(r.color.transparent));
//        guidelist.add(rl);
        log.i("lgq","sss==="+myapplication.getnscreenwidth()+"..."+viewgroup.layoutparams.match_parent);
        guidepageadapter vpadapter = new guidepageadapter(guidelist);
        vp.setadapter(vpadapter);
        vp.setonpagechangelistener(new viewpager.onpagechangelistener() {
            @override
            public void onpagescrolled(int position, float positionoffset, int positionoffsetpixels) {
            }
            @override
            public void onpageselected(int position) {
                textview.settext(position+1+"/"+3);
            }
            @override
            public void onpagescrollstatechanged(int state) {
            }
        });
    }
    private view getguideview(int ndrawableid) {
        imageview iv = new imageview(this);
        viewgroup.layoutparams lp = new viewgroup.layoutparams(viewgroup.layoutparams.match_parent, viewgroup.layoutparams.match_parent);
        iv.setlayoutparams(lp);
        iv.setbackground(this.getresources().getdrawable(r.drawable.guide_1));
        iv.setscaletype(imageview.scaletype.center_inside);
        iv.setimageresource(ndrawableid);
        return iv;
    }
}

activity配置属性

<activity android:name=".viewpageractivity"
    android:configchanges="orientation|keyboardhidden"
    android:label="@string/app_name"
    android:screenorientation="portrait"
    android:windowsoftinputmode="statehidden|adjustpan"></activity>

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