没点击跳过自然进入d88尊龙官网手机app主页，点击跳过之后立即进入d88尊龙官网手机app主页
1.欢迎页布局activity_sp.xml放一张背景图（图片随你便啦）再放一个盛放倒计时的textview
2.主要java代码
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;
}
}
}
这里style里改了样式，没有标题栏theme.appcompat.light.noactionbar
补充:
android程序跳过登录界面直接进入主界面（自动登录）
首先是欢迎界面的代码
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);
}
}
接下来是文章的主要内容。实现自动登录的关键是当程序从欢迎界面跳转到登录界面是，在登录界面还没有加载布局文件时判断是否登陆过，从而实现直接跳转到主界面。这里我们采用sharedpreferences来保存登录状态。代码如下：
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();
}
});
}
}
接下来是实现注销后要重新进入登录界面
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();
}
}
