Android判断界面

     仿造微信，第一次进入去引导界面，否则进启动界面。

package edu.hpu.init;


import edu.hpu.logic.R;

import android.app.Activity;

import android.content.Intent;

import android.content.SharedPreferences;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;


public class TellActivity extends Activity {

	boolean isFirstIn = false;


	private static final int GO_HOME = 1000;

	private static final int GO_GUIDE = 1001;

	// 延迟3秒

	private static final long delayTime = 3000;

	private static final String spName = "first_pref";


	private Handler mHandler = new Handler() {


		@Override

		public void handleMessage(Message msg) {

			switch (msg.what) {

			case GO_HOME:

				goHome();

				break;

			case GO_GUIDE:

				goGuide();

				break;

			}

			super.handleMessage(msg);

		}

	};


	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.splash);


		init();

	}


	private void init() {

		// 读取SharedPreferences中需要的数据

		// 使用SharedPreferences来记录程序的使用次数

		//接口，MODE_PRIVATE指定该SharedPreferences数据只能被本应用程序读、写

		SharedPreferences preferences = getSharedPreferences(

				spName, MODE_PRIVATE);

		SharedPreferences.Editor editor;

		editor = preferences.edit();


		// 取得相应的值，如果没有该值，说明还未写入，用true作为默认值

		isFirstIn = preferences.getBoolean("isFirstIn", true);


		// 判断程序第几次运行，如果是第一次运行则跳转到引导界面，否则跳转到主界面

		if (!isFirstIn) {

			mHandler.sendEmptyMessageDelayed(GO_HOME, delayTime);

		} else {

			// 使用Handler的postDelayed方法，3秒后执行GuideActivity

			mHandler.sendEmptyMessageDelayed(GO_GUIDE, delayTime);

			editor.putBoolean("isFirstIn", false);

			editor.commit();

		}


	}


	private void goHome() {

		Intent intent = new Intent(this, StartActivity.class);

		startActivity(intent);

		this.finish();

	}


	private void goGuide() {

		Intent intent = new Intent(this, GuideActivity.class);

		startActivity(intent);

		this.finish();

	}

}