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();
	}
}