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

来源：http://blog.csdn.net/zf1228/article/details/55271828