android开发中引导页解析

潘安邦个人资料,无限恐怖传染病,长虹pf29800

引导页是几乎所有app都会使用的，这不是什么很难实现的功能，在这里做记录是方便以后使用，不用在去写而是直接可以拿来使用

public class carouselactivity extends baseactivity implements onclicklistener, onpagechangelistener {
    private viewpager vp;
    private viewpageradapter vpadapter;
    private list views;
    private button button;

    private static final int[] pics = {r.mipmap.carousel1,
            r.mipmap.carousel2, r.mipmap.carousel3,
            r.mipmap.carousel4};


    private imageview[] dots;


    private int currentindex;

    /**
     * called when the activity is first created.
     */
    @override
    public void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        setcontentview(r.layout.activity_carousel);

        statusbarutil.settransparentforwindow(this);
        //解决华为虚拟键问题
        if (build.version.sdk_int >= build.version_codes.kitkat) {
            getwindow().addflags(windowmanager.layoutparams.flag_translucent_navigation);
        }
        checkdevicehasnavigationbar(getapplicationcontext());
        //判断是否有虚拟键
        if (checkdevicehasnavigationbar(getapplicationcontext())) {
            solvenavigationbar(getwindow());
        }
        button = (button) findviewbyid(r.id.button);
        views = new arraylist();

        linearlayout.layoutparams mparams = new linearlayout.layoutparams(linearlayout.layoutparams.wrap_content,
                linearlayout.layoutparams.wrap_content);


        for (int i = 0; i < pics.length; i++) {
            imageview iv = new imageview(this);
            iv.setlayoutparams(mparams);
            iv.setimageresource(pics[i]);
            views.add(iv);
        }
        vp = (viewpager) findviewbyid(r.id.viewpager);

        vpadapter = new viewpageradapter(views);

        vp.setadapter(vpadapter);

        vp.setonpagechangelistener(this);
//        button = (button) findviewbyid(r.id.button);

        initdots();
        button.setonclicklistener(new onclicklistener() {

            @override
            public void onclick(view arg0) {
                carouselactivity.this.finish();
                intent intent = new intent();
                intent.setclass(carouselactivity.this, mainactivity.class);
//                intent.setflags(intent.flag_activity_clear_top);//它可以关掉所要到的界面中间的activity

                startactivity(intent);

            }
        });

    }

    /**
     * 
shang
     * 
判断是否有虚拟按键
     *
     * @param context
     * @return
     */
    public boolean checkdevicehasnavigationbar(context context) {
        boolean hasnavigationbar = false;
        resources rs = context.getresources();
        int id = rs.getidentifier("config_shownavigationbar", "bool", "android");
        if (id > 0) {
            hasnavigationbar = rs.getboolean(id);
        }
        try {
            class systempropertiesclass = class.forname("android.os.systemproperties");
            method m = systempropertiesclass.getmethod("get", string.class);
            string navbaroverride = (string) m.invoke(systempropertiesclass, "qemu.hw.mainkeys");
            if ("1".equals(navbaroverride)) {
                hasnavigationbar = false;
            } else if ("0".equals(navbaroverride)) {
                hasnavigationbar = true;
            }
        } catch (exception e) {
        }
        return hasnavigationbar;
    }

    /**
     * 
shang
     * 
解决虚拟按键问题
     *
     * @param window
     */
    public void solvenavigationbar(window window) {

        //保持布局状态
        int uioptions = view.system_ui_flag_layout_stable |
                //布局位于状态栏下方
                view.system_ui_flag_layout_hide_navigation |
                //全屏
                view.system_ui_flag_fullscreen |
                //隐藏导航栏
                view.system_ui_flag_hide_navigation |
                view.system_ui_flag_layout_fullscreen;
        if (build.version.sdk_int >= 19) {
            uioptions |= 0x00001000;
        } else {
            uioptions |= view.system_ui_flag_low_profile;
        }
        window.getdecorview().setsystemuivisibility(uioptions);
    }


    private void initdots() {
        linearlayout ll = (linearlayout) findviewbyid(r.id.ll);

        dots = new imageview[pics.length];


        for (int i = 0; i < pics.length; i++) {
            dots[i] = (imageview) ll.getchildat(i);
            dots[i].setenabled(true);
            dots[i].setonclicklistener(this);
            dots[i].settag(i);
        }

        currentindex = 0;
        dots[currentindex].setenabled(false);
    }

    private void setcurview(int position) {
        if (position < 0 || position >= pics.length) {
            return;
        }

        vp.setcurrentitem(position);
    }


    private void setcurdot(int positon) {
        if (positon < 0 || positon > pics.length - 1 || currentindex == positon) {
            return;
        }

        dots[positon].setenabled(false);
        dots[currentindex].setenabled(true);

        currentindex = positon;
    }


    @override
    public void onpagescrollstatechanged(int arg0) {
        // todo auto-generated method stub

    }


    @override
    public void onpagescrolled(int arg0, float arg1, int arg2) {
        // todo auto-generated method stub

    }


    @override
    public void onpageselected(int arg0) {

        setcurdot(arg0);
        if (arg0 == 3) {
            button.setvisibility(view.visible);

        } else {
            button.setvisibility(view.gone);
        }
    }

    @override
    public void onclick(view v) {
        int position = (integer) v.gettag();
        setcurview(position);
        setcurdot(position);
    }

    class viewpageradapter extends pageradapter {


        private list views;

        public viewpageradapter(list views) {
            this.views = views;
        }


        @override
        public void destroyitem(view arg0, int arg1, object arg2) {
            ((viewpager) arg0).removeview(views.get(arg1));
        }

        @override
        public void finishupdate(view arg0) {
            // todo auto-generated method stub

        }


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

            return 0;
        }


        @override
        public object instantiateitem(view arg0, int arg1) {

            ((viewpager) arg0).addview(views.get(arg1), 0);

            return views.get(arg1);
        }

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

        @override
        public void restorestate(parcelable arg0, classloader arg1) {
            // todo auto-generated method stub

        }

        @override
        public parcelable savestate() {
            // todo auto-generated method stub
            return null;
        }

        @override
        public void startupdate(view arg0) {
            // todo auto-generated method stub

        }

    }


}

<relativelayout xmlns:android="https://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:scaletype="center"
        android:id="@+id/viewpager"
        android:layout_gravity="center"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />


    <linearlayout
        android:visibility="gone"
        android:id="@+id/ll"
        android:orientation="horizontal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginbottom="24.0dip"
        android:layout_alignparentbottom="true"
        android:layout_centerhorizontal="true">

        <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>
    <button
        android:background="@null"
        android:id="@+id/button"
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:layout_above="@id/ll"
        android:layout_centerhorizontal="true"
        android:layout_alignparentbottom="true"
        android:layout_marginbottom="20dp"
        />

relativelayout>

欢迎页做判断

if (preferences.getboolean("firststart", true)) {

    new handler().postdelayed(new runnable() {

        @override
        public void run() {
            editor = preferences.edit();
            //将登录标志位设置为false，下次登录时不在显示首次登录界面
            editor.putboolean("firststart", false);
            editor.commit();
            intent intent=new intent();
            intent.setclass(welcomeactivity.this,carouselactivity.class);
            startactivity(intent);
            finish();
        }
    },2000);
}

代码基本就是这些，有些地方需要自己补充。

如对本文有疑问，请在下面进行留言讨论，广大热心网友会与你互动！！ 点击进行留言回复