实现简单Handle倒计时跳转

首先布局页面使用一个TextView控件，为展示倒计时的效果，也可自己添加背景

<?xml version="1.0" encoding="utf-8"?>

在主Actvity中实现倒计时跳转

package com.example.ewm;

import android.app.Activity;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends Activity {

private TextView time;
//首先写一个从几秒开始倒计时的int值
private int times = 5;

Handler handler = new Handler(){
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        switch (msg.what){
            case 0:
                if (times>0){//判断，如果倒计时这个数还大于0就继续减减
                    times--;
                    time.setText("" + times);
                    Message message = new Message();
                    message.what = 0;
                    handler.sendMessageDelayed(message, 1000);
                }else {//否则就跳转到要跳转到你的下一个页面
                    startActivity(new Intent(MainActivity.this, TwoActivity.class));
                    finish();
                }
                break;
        }
    }
};
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    time = findViewById(R.id.time);
    handler.sendEmptyMessage(0);//最后线程发送一个消息
}

}