上一篇博文《》通过实现倒计时闪屏页面的制作引出了Handler的用法以及实现原理,博文末尾也提到了实现过程中的Bug,有兴趣的朋友能够点击链接回去看看。今天通过使用Handler以及CountDownTimer来实现完整版的倒计时闪屏(不会出如今退出闪屏页后,依旧会跳转页面的现象)。
1. 实现效果例如以下:
(1)正常进入跳转的效果以及log显示
(2) 倒计时未结束时退出以及log显示
2. 实现方法
(1)去除actionBar
(2) layout布局
xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_splash" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@mipmap/background_login" tools:context="com.mly.panhouye.handlerdemo.SplashActivity"> <TextView android:gravity="right" android:id="@+id/tv_time" android:textColor="@color/colorAccent" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="SS" android:textSize="30sp"/> </RelativeLayout>
(3)java实现代码
package com.mly.panhouye.handlerdemo;import android.content.Intent;import android.os.Bundle;import android.os.CountDownTimer;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.Window;import android.view.WindowManager;import android.widget.TextView;public class SplashActivity extends AppCompatActivity { private MyHandler myHandler = new MyHandler(); private TextView tv_time; private MyCountDownTimer mc; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //设置Activity为全屏 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); //去标题状态栏 requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_splash); tv_time = (TextView) findViewById(R.id.tv_time); mc = new MyCountDownTimer(5000, 1000); mc.start(); /** * 使用handler的postDelayed延迟5秒运行页面跳转 * (与CountDownTimer的millisInFuture一致) */ myHandler.postDelayed(new Runnable() { @Override public void run() { startMainActivity(); } },5000); } //将Handler声明为静态内部类 private static class MyHandler extends Handler { @Override public void handleMessage(Message msg) { super.handleMessage(msg); } } //页面跳转的方法 private void startMainActivity(){ Intent intent = new Intent(this,Main3Activity.class); startActivity(intent); finish();//完毕跳转后销毁闪屏页(从栈内移除) } class MyCountDownTimer extends CountDownTimer { /** * @param millisInFuture * 表示以毫秒为单位 倒计时的总数 * 比如 millisInFuture=1000 表示1秒 * @param countDownInterval * 表示 间隔 多少微秒 调用一次 onTick 方法 * 比如: countDownInterval =1000 ; 表示每1000毫秒调用一次onTick() */ public MyCountDownTimer(long millisInFuture, long countDownInterval) { super(millisInFuture, countDownInterval); } public void onFinish() { tv_time.setText("正在跳转"); } public void onTick(long millisUntilFinished) { tv_time.setText("倒计时(" + millisUntilFinished / 1000 + ")"); Log.i("tag","倒计时"+millisUntilFinished / 1000); } } @Override protected void onDestroy() { super.onDestroy(); //闪屏页销毁时将消息对象从消息队列移除并结束倒计时 myHandler.removeCallbacksAndMessages(null); mc.cancel(); Log.i("tag","destory"); }}