Android实现倒计时跳转Activity

现在的APP大部分打开时的欢迎界面都有广告，倒计时结束进入主界面，今天就自己试试实现了一下，主要用到有：

Intent：意图，实现页面跳转

CountDownTimer：倒计时器，不言而喻

Handler:消息处理类，将跳转意图发送到消息队列，可以设置延迟

完整代码如下：

package com.example.sharedpreferences;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;import android.os.Bundle;import android.os.CountDownTimer;import android.os.Handler;import android.view.Window;import android.view.WindowManager;import android.widget.TextView;public class Welcome extends Activity {private static final String MY_DB_FirstCheck = "my_db";private TextView countdown;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);this.requestWindowFeature(Window.FEATURE_NO_TITLE);this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);setContentView(R.layout.welcome_layout);countdown = (TextView) findViewById(R.id.TView_countdown);final SharedPreferences sharedpreferences = getSharedPreferences(MY_DB_FirstCheck, Context.MODE_PRIVATE);/** * Check if this is user's first visit; */final boolean hasVisited = sharedpreferences.getBoolean("hasVisited",false);/** * Default preference is 'false',if 'sharedpreferences' hasn't the * String 'hasVisited'. */countdowntimer = new MyCountdownTimer(3000, 1000);countdowntimer.start();handler.postDelayed(new Runnable() {@Overridepublic void run() {if (!hasVisited) {/** * Show Login Activity. */Intent intent = new Intent();intent.setClass(Welcome.this, Login.class);startActivity(intent);/** * Commit change: change state to 'true'. */Editor edit = sharedpreferences.edit();edit.putBoolean("hasVisited", true);edit.commit();} else {Intent intent = new Intent();intent.setClass(Welcome.this, MainActivity.class);startActivity(intent);}finish();}}, 3000);}private Handler handler = new Handler();private MyCountdownTimer 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 *  */protected class MyCountdownTimer extends CountDownTimer {public MyCountdownTimer(long millisInFuture, long countDownInterval) {super(millisInFuture, countDownInterval);}@Overridepublic void onTick(long millisUntilFinished) {countdown.setText("Close(" + millisUntilFinished / 1000 + ")");}@Overridepublic void onFinish() {countdown.setText("Turning");}}}

注意：finish()必须写在Runnable()中，写在方法外围会造成欢迎界面闪退，之后直接进入主界面

今天就写到这里，明天准备把倒计时那里加上点击事件，实现跳过等待时间的过程，暂时还没有想法，明天继续！

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