android实现App活动定时自动跳转效果

app的小功能点，很简单几十行代码就可以实现

主页面代码

package com.buildingbuilding;

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.windowmanager;
import android.widget.textview;

import com.buildingbuilding.activitys.buildingactivity;

public class mainactivity extends appcompatactivity {
  private textview textview;
  private handler handler = new handler() {
    @override
    public void handlemessage(message msg) {
      if (msg.what != 0) {
        textview.settext(msg.what + "秒后进入app");
      } else {
        intent intent = new intent(mainactivity.this, buildingactivity.class);
        startactivity(intent);
        finish();
      }
    }
  };
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
    init();
  }

  private void init() {
    //全屏显示
    getsupportactionbar().hide();
    getwindow().setflags(windowmanager.layoutparams.flag_fullscreen, windowmanager.layoutparams.flag_fullscreen);

    textview = (textview) findviewbyid(r.id.textview);
    textview.settext("布丁布丁");

    new countdown().start();
  }

  //进入app倒计时
  class countdown extends thread {
    int count = 3;
    @override
    public void run() {
      try {
        while (count >= 0) {
          sleep(1000);
          message message = new message();
          message.what = count;
          handler.sendmessage(message);
          count--;
        }
      } catch (interruptedexception e) {
        e.printstacktrace();
      }

    }
  }
}

基本思路就是，通过一个计时线程来控制主线程（即ui线程）来更新ui

通过handler来接受来自计时线程的message

private handler handler = new handler() {
    @override
    public void handlemessage(message msg) {
      if (msg.what != 0) {
        textview.settext(msg.what + "秒后进入app");
      } else {
        intent intent = new intent(mainactivity.this, buildingactivity.class);
        startactivity(intent);
        finish();
      }
    }
  };

2.计时线程（内部类），设置每隔1秒睡一次，共3秒

//进入app倒计时
  class countdown extends thread {
    int count = 3;
    @override
    public void run() {
      try {
        while (count >= 0) {
          sleep(1000);
          message message = new message();
          message.what = count;
          handler.sendmessage(message);
          count--;
        }
      } catch (interruptedexception e) {
        e.printstacktrace();
      }

    }
  }

3.最后别忘了在init（）方法中启动线程

private void init() {
    //全屏显示
    getsupportactionbar().hide();
    getwindow().setflags(windowmanager.layoutparams.flag_fullscreen, windowmanager.layoutparams.flag_fullscreen);

    textview = (textview) findviewbyid(r.id.textview);
    textview.settext("布丁布丁");

    new countdown().start();
  }

ok，现在基本都完成了，来看效果

 

 

 

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