App进入首页三秒后跳转到主页面，第二次进入直接跳到主页面，带倒计时

来源：互联网发布：五线谱打谱软件mac 编辑：程序博客网时间：2024/04/29 20:20

如果需要首页面倒计时跳转  直接将下面代码复制到工程中，

package com.example.a1.zhaoshan20170619;import android.content.Intent;import android.content.SharedPreferences;import android.os.Bundle;import android.os.CountDownTimer;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.widget.TextView;//首页实现三秒跳转，第二次进入直接跳过首页面public class MainActivity extends AppCompatActivity {    private TextView timerView;    private int time = 3;    private Handler handler =new Handler(){        @Override        public void handleMessage(Message msg) {            switch (msg.what) {                case 0:                  //time--;                    //timerView.setText("还有"+ time+"秒跳转");                    Intent intent = new Intent(MainActivity.this,SecondActivity.class);                    startActivity(intent);                    break;                default:                    break;            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //实例化一个sp对象        SharedPreferences sp = getSharedPreferences("USER",MODE_PRIVATE);        //得到一个编辑器        SharedPreferences.Editor edit = sp.edit();        //得到一个bool值        boolean first = sp.getBoolean("first", true);        if (first){            //如果是第一次就给他put一个值 改变状态为false            edit.putBoolean("first",false);            edit.commit();            initview();//初始化数据            handler.sendEmptyMessageDelayed(0,3000);        }else {            //直接跳转            Intent intent = new Intent(MainActivity.this,SecondActivity.class);            startActivity(intent);        }    }    private void initview() {        timerView = (TextView) findViewById(R.id.textView);        //实例化一个MyCount：        MyCount myCount = new MyCount(3000,1000);        // 开始倒计时：        myCount.start();    }  //创建一个类继承CountDownTimer    /**     * Rewrite 'CountDownTimer' method.     *     * @param millisInFuture     *            倒计时总数，单位为毫秒。     * @param countDownInterval     *            每隔多久调用onTick一次     * @author DaiZhenWei     *     */    public class MyCount extends CountDownTimer {        public MyCount(long millisInFuture, long countDownInterval) {            super(millisInFuture, countDownInterval);        }        @Override        public void onFinish() {            timerView.setText("");        }        @Override        public void onTick(long millisUntilFinished) {            timerView.setText("请等待60秒(" + millisUntilFinished / 1000 + ")...");        }    }}

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