Android开发欢迎页点击跳过倒计时进入主页

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/a">
    <relativelayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <textview
            android:id="@+id/tv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignparentright="true"
            android:layout_marginright="20dp"
            android:layout_margintop="10dp"
            android:textsize="20sp" />
    </relativelayout>
</linearlayout>

package com.cwj.test;
import android.content.intent;
import android.os.handler;
import android.support.v7.app.appcompatactivity;
import android.os.bundle;
import android.view.view;
import android.view.windowmanager;
import android.widget.textview;
import java.util.timer;
import java.util.timertask;
public class spactivity extends appcompatactivity implements view.onclicklistener {
    private int reclen = 5;//跳过倒计时提示5秒
    private textview tv;
    timer timer = new timer();
    private handler handler;
    private runnable runnable;
    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        //定义全屏参数
        int flag= windowmanager.layoutparams.flag_fullscreen;
        //设置当前窗体为全屏显示
        getwindow().setflags(flag, flag);
        setcontentview(r.layout.activity_sp);
        initview();
        timer.schedule(task, 1000, 1000);//等待时间一秒，停顿时间一秒
        /**
         * 正常情况下不点击跳过
         */
        handler = new handler();
        handler.postdelayed(runnable = new runnable() {
            @override
            public void run() {
                //从闪屏界面跳转到首界面
                intent intent = new intent(spactivity.this, mainactivity.class);
                startactivity(intent);
                finish();
            }
        }, 5000);//延迟5s后发送handler信息
    }
    private void initview() {
        tv = findviewbyid(r.id.tv);//跳过
        tv.setonclicklistener(this);//跳过监听
    }
    timertask task = new timertask() {
        @override
        public void run() {
            runonuithread(new runnable() { // ui thread
                @override
                public void run() {
                    reclen--;
                    tv.settext("跳过 " + reclen);
                    if (reclen < 0) {
                        timer.cancel();
                        tv.setvisibility(view.gone);//倒计时到0隐藏字体
                    }
                }
            });
        }
    };
    /**
     * 点击跳过
     */
    @override
    public void onclick(view view) {
        switch (view.getid()) {
            case r.id.tv:
                //从闪屏界面跳转到首界面
                intent intent = new intent(spactivity.this, mainactivity.class);
                startactivity(intent);
                finish();
                if (runnable != null) {
                    handler.removecallbacks(runnable);
                }
                break;
            default:
                break;
        }
    }
}

<style name="apptheme" parent="theme.appcompat.light.noactionbar">
        <!-- customize your theme here. -->
        <item name="colorprimary">@color/colorprimary</item>
        <item name="colorprimarydark">@color/colorprimarydark</item>
        <item name="coloraccent">@color/coloraccent</item>
</style>

public class welcomeactivity extends activity{
    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        setcontentview(r.layout.welcome);
        /**
         * 延迟3秒进入主界面
         */
        new handler().postdelayed(new runnable() {
            @override
            public void run() {
                intent intent=new intent(welcomeactivity.this,loginactivity.class);
                startactivity(intent);
                welcomeactivity.this.finish();
            }
        },1000*3);
    }
}

public class loginactivity extends activity{
    sharedpreferences sprfmain;
    sharedpreferences.editor editormain;
    button login;
    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        //在加载布局文件前判断是否登陆过
        sprfmain= preferencemanager.getdefaultsharedpreferences(this);
        editormain=sprfmain.edit();
        //.getboolean("main",false)；当找不到"main"所对应的键值是默认返回false
        if(sprfmain.getboolean("main",false)){
            intent intent=new intent(loginactivity.this,mainactivity.class);
            startactivity(intent);
            loginactivity.this.finish();
        }
        setcontentview(r.layout.login);
        login= (button) findviewbyid(r.id.login);
        //这里只是简单用按键模拟登录功能
        login.setonclicklistener(new view.onclicklistener() {
            @override
            public void onclick(view v) {
                intent intent=new intent(loginactivity.this,mainactivity.class);
                editormain.putboolean("main",true);
                editormain.commit();
                startactivity(intent);
                loginactivity.this.finish();
            }
        });
    }
}

public class mainactivity extends appcompatactivity {
    sharedpreferences sprfmain;
    sharedpreferences.editor editormain;
    button exit;
    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        setcontentview(r.layout.activity_main);
        exit= (button) findviewbyid(r.id.exit);
        exit.setonclicklistener(new view.onclicklistener() {
            @override
            public void onclick(view v) {
            //点击注销按键后调用loginactivity提供的resetsprfmain()方法执行editormain.putboolean("main",false);，即将"main"对应的值修改为false
                resetsprfmain();
                intent intent=new intent(mainactivity.this,welcomeactivity.class);
                startactivity(intent);
                mainactivity.this.finish();
            }
        });
    }
    public void resetsprfmain(){
        sprfmain= preferencemanager.getdefaultsharedpreferences(this);
        editormain=sprfmain.edit();
        editormain.putboolean("main",false);
        editormain.commit();
    }
}